Neo_WM620 WCDMA Module Hardware User Guide. Version 1.4

Transcription

1 Neo_WM620 WCDMA Module Hardware User Guide Version 1.4

2 Neo_M680 GPRS Module Hardware User Guide Copyright Neoway Technology Co., Ltd All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Shenzhen Neoway Technology Co., Ltd. is the trademark of Neoway Technology Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice This document is intended for system engineers (SEs), development engineers, and test engineers. The information in this document is subject to change without notice due to product version update or other reasons. Every effort has been made in preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Neoway provides customers complete technical support. If you have any question, please contact your account manager or to the following addresses: Sales@neoway.com.cn Support@neoway.com.cn Website: Copyright Neoway Technology Co., Ltd i

3 Revision Record Issue Changes Revised By Date V1.0 Initial draft Tang Kefu V1.1 Added UART description Tang Kefu V1.2 Modified the description of the USB interfaces Tang Kefu V1.3 Modified the description of some pins Li Qiusheng V1.4 Adjusted the structure of this guide Added sections 3.6 Sleep Mode and 3.8 RF Interface, chapters 4 RF Features, and 5 Electric Features and Reliability Li Qiusheng Copyright Neoway Technology Co., Ltd ii

4 Contents 1 Introduction to WM Overview Block Diagram Specifications Pin Description and PCB Foot Print Specifications Pin Definition PCB Foot Print Interface Design Power Supply and Switch Interfaces VBAT VRTC VDD ON_OFF Pin and Power-on Procedure RESET Running Status Indication LED Indicator RING Pin USIM Card Interface USB Interfaces UART Basic Descriptions of UART Level Shifting for UART Sleep Mode UART Control USB Control Audio Interface RF Interface RF Design and PCB Layout RF Features Work Band Transmitting Power and Receiving Sensitivity Transmitting Power Receiving Sensitivity Electric Features and Reliability Electric Feature Temperature Current Copyright Neoway Technology Co., Ltd iii

5 5.4 ESD Protection Typical Circuits Mounting the Module onto the Application Board Package Abbreviations Copyright Neoway Technology Co., Ltd iv

6 Table of Figures Figure 2-1 Bottom view of the WM620 module... 4 Figure 2-2 PCB foot print recommended for WM620 (unit: mm)... 7 Figure 3-1 Current peaks and voltage drops... 8 Figure 3-2 Power supply design... 9 Figure 3-3 Reference design of power supply controlled by MIC Figure 3-4 Reference design of power supply controlled by p-mosfet Figure 3-5 RTC reference design...11 Figure 3-6 Reference circuit of ON_OFF controlled by high level Figure 3-7 Power-on procedure Figure 3-8 Reset circuit Figure 3-9 LED indicator Figure 3-10 RING indicator for incoming call Figure 3-11 RING indicator for SMS Figure 3-12 Reference design of USIM card interface Figure 3-13 Recommended ESD diode array Figure 3-14 Reference of SIM card socket Figure 3-15 Reference USB circuit Figure 3-16 Signal connection between DCE and DTE Figure 3-17 Recommended circuit between 3.3V MCU and UART Figure 3-18 Recommended circuit between 5V MCU and UART Figure 3-19 Sleep mode controlled by UART Figure 3-20 Sleep mode controlled by USB (a) Figure 3-21 Sleep mode controlled by USB (b) Figure 3-22 Reference design of MIC differential connections Figure 3-23 Reference design of single-end input MIC interface Figure 3-24 Reference design for speaker differential output Figure 3-25 Reference design for speaker single-ended output Figure 3-26 Reference design for antenna interface Figure 3-27 RF layout reference Copyright Neoway Technology Co., Ltd v

7 Table of Tables Table 1-1 WM620 specifications... 2 Table 2-1 WM620 pin definition... 5 Table 3-1 Power supply and switch interface... 8 Table 3-2 Capacity matching power failure duration...11 Table 3-3 LED indicator Table 3-4 SIM Card Interface Table 3-5 USB interface Table 3-6 UART Table 3-7 Audio interface Table 3-8 MIC voltage and current Table 3-9 EAR parameter Table 3-10 SPK parameter Table 4-1 Work band Table 4-2 Transmitting power (unit: dbm) Table 4-3 Receiving sensitivity (Unit: dbm) Table 5-1 Electric feature of the module Table 5-2 Temperature Feature (Unit: ºC) Table 5-3 Operating current (Unit: ma) Table 5-4 Current in sleep mode Table 5-5 ESD feature of the module Copyright Neoway Technology Co., Ltd vi

8 1 Introduction to WM Overview WM620 is a WCDMA module that supports multiple network modes including HSDPA, UMTS, EDGE, GPRS, and GSM. For HSDPA, this module supports 3.6 Mbit/s for downlink data and 384 Kbit/s for uplink data. WM620 provides high-quality data and voice communication, SMS and other functions, and is widely applied to electricity, Internet of Vehicle (IoV), video monitoring, handset devices, etc. WM620 is an SMT module in LCC compact package. It can be easily adopted for standard Mini PCI-E interface. WM620 includes the following product series. Model Band UMTS 2100 UMTS 1900 UMTS 900 UMTS 850 PCS 1900 DCS 1800 EGSM 900 GSM 850 WM620-A WM620-B This user guide details the features, indicators, and testing standards of WM Block Diagram WM620 module consists of power supply management, baseband controller, MCP, power amplifier (PA), 19.2 MHz transistor, KHz transistor, various application interfaces, etc. All sections coordinate with each other to provide such communication functions as data and voice services. The following figure shows the block diagram of WM620. Copyright Neoway Technology Co., Ltd 1

9 1.3 Specifications Table 1-1 WM620 specifications Specification Frequency Band Sensitivity Max. Transmit Power Description WM620-A: UMTS2100/900 MHz GSM850/900/1800/1900 MHz WM620-B: UMTS1900/850 MHz GSM850/900/1800/1900 MHz -107 dbm GSM/GPRS 850M/900 MHz: +33 dbm (Power Class 4) GSM/GPRS 1800 MHz/1900 MHz: +30 dbm (Power Class 1) EDGE 850M/900 MHz: +27 dbm (Power Class E2) EDGE1800 MHz/1900 MHz: +26 dbm (Power Class E2) WCDMA/HSDPA: +23 dbm (Power Class 3) Transient Current Standby Current (Idle) Max 2 A <5.0 ma Operating Temperature 30 C to + 80 C Storage Temperature 40 C to + 85 C Dimension Operating Voltage AT Command Driver Audio SMS Technical Standard Data Rate 30 mm x 30 mm x 2.7 mm 3.3 V to 4.2 V DC (recommended 3.9 V, 25 C) GSM07.07 Neoway extended AT commands (Refer to Neo_WM620 WCDMA Module AT Command Set) Supporting Windows XP, Windows 7, Linux(2.6.1), Android GSM: FR, EFR, HR, AMR Voice Coding, DTMF WCDMA: AMR, ARM-WB TEXT/PDU Point of Point / Cell Broadcast UMTS/WCDMA/GSM/GPRS/EDGE Specification Release 99 (3GPP R99) UMTS/WCDMA Specification Release 5 (3GPP R5) HSDPA DL: 3.6 Mbit/s GSM/GPRS/EDGE Specification Release 4 (3GPP R4) GPRS/EDGE Multislot Class 12, Release 4 DTM Multislot Class 11 GSM CS: UL 14.4 Kbit/s / DL 14.4 Kbit/s GPRS: UL 85.6 Kbit/s / DL 85.6 Kbit/s EDGE: DL Kbit/s / UL: Kbit/s WCDMA CS: UL 64 Kbit/s / DL 64 Kbit/s WCDMA PS: UL 384 Kbit/s / DL 384 Kbit/s Copyright Neoway Technology Co., Ltd 2

10 HSDPA: DL 3.6 Mbit/s / UL 384 Kbit/s Circuit Switched Data Support CSD Support USSD Call Transfer (CFB, CFNA, CFU) Supplementary Service Call Waiting Three-Way Calling Copyright Neoway Technology Co., Ltd 3

11 2 Pin Description and PCB Foot Print 2.1 Specifications Specifications WM620 Dimensions 30 mm x 30 mm x 2.7 mm (H x W x D) Weight Encapsulation 5 g 62-pin LGA Figure 2-1 Bottom view of the WM620 module SPK_N MIC_1P RESET V_BUS USIM _CLK RING TXD ANT_M SPK_P MIC_1N EAR_N EAR_P VDD_2.6V VDD_1.8V VBAT VBAT USB_D- USB_D+ USIM _DATA USIM _RST USIM_VCC ON_OFF VRTC SIG_LED ADC CTS RTS RXD SLEEP_IN MIC_2P MIC_2N POWER USB Audio UIM UART Reserved JTAG RF_ANT Empty Others Copyright Neoway Technology Co., Ltd 4

12 The figure shows main application pins. Select pins based on your product requirements and leave pins that you do not use not connected. For more details about pins, see the pin description. JTAG pins have not be open to customers. 2.2 Pin Definition Table 2-1 WM620 pin definition Pin No. Pin Name I/O Function Power Supply and Switch Interfaces Level Feature (V) Remarks 22, 23 VBAT PWR Main power supply 3.3 V to 4.2 V 26 VDD_1.8V PWR 27 VDD_2.6V PWR 1.8 V power supply output 2.6 V power supply output Continuous voltage output after the module is on 47 VRTC PWR RTC power supply I/O 46 ON_OFF I On/Off control 1.5 V to 3.25 V DC Typical value: 3.0 V Internally pulled up to 1.8 V by 200K 25 RESET DI Reset pin VDD_1.8V 1, 12, 17, 21, 24, 34, 43, 45, 50, 61 PWR Ground Audio Interface 28 EAR_P AO 29 EAR_N AO Earphone output (+) Earphone output (-) amplifier amplifier Keep not connected () if not used 30 MIC_1N AI Microphone #1 input (-) 31 MIC_1P AI Microphone #1 input (+) 32 MIC_2P AI Microphone #2 input (-) 33 MIC_2N AI Microphone #2 input (+) Keep if not used Keep if not used 35 SPK_P AO 36 SPK_N AO UART Interface Speaker amplifier output (+) Speaker amplifier output (-) Keep if not used Keep if not used Copyright Neoway Technology Co., Ltd 5

13 52 CTS I UART to send data VDD_2.6V 53 RTS O 54 RXD I UART ready for receiving data High-speed UART receive data input VDD_2.6V VDD_2.6V At most 3 V input Not support firmware update 55 TXD O High-speed UART transmit data output VDD_2.6V SIM Card 13 USIM_VCC PWR USIM card power supply 1.8V/3V 14 USIM_RST O USIM card reset 1.8V/3V 15 USIM_DATA I/O USIM card data 1.8V/3V Externally pulled up to USIM_VCC by 10K 16 USIM _CLK I/O USIM card clock 1.8V/3V USB Interfaces 18 USB_D+ I/O 19 USB_D- I/O High-speed USB differential USB data (+) High-speed USB differential USB data (-) Used for firmware updating 20 V_BUS PWR USB power supply Voltage range: 3.3 V to 5.25 V Antenna 44 ANT_M AI/AO RF I/O LED Indicator 48 SIG_LED O Network indicator VDD_2.6V SMS and Incoming Call Ring 51 RING O Sleep Mode Controlling 60 SLEEP_IN DI ADC Indicating an incoming call or message Controlling the sleep mode VDD_2.6V VDD_1.8V 49 ADC AI 12-bit ADC input Voltage range: 0 V to 2.2 V Reserved Pins 2-11, 37-42, 56-59, 62 Copyright Neoway Technology Co., Ltd 6

14 2.3 PCB Foot Print LGA packaging is adopted to package the pins of the WM620 module. Figure 2-2 shows the recommended PCB foot print. Figure 2-2 PCB foot print recommended for WM620 (unit: mm) Copyright Neoway Technology Co., Ltd 7

15 3 Interface Design 3.1 Power Supply and Switch Interfaces Table 3-1 Power supply and switch interface Pin Name I/O Function Remarks 22, 23 VBAT PWR Main power supply 3.3 V to 4.2 V (3.9 V is recommended) 26 VDD_1.8V PWR 1.8 V power supply output 27 VDD_2.6V PWR 2.6 V power supply output 47 VRTC PWR RTC power supply input/output Not used for any other functions Ensure that the VBAT never exceeds 4.5 V DC. Voltage higher than 4.5 V DC may damage the WM620 module VBAT VBAT is the main power supply of the module. Its input voltage ranges from 3.3 V to 4.2 V and the preferable value is 3.9V. The average current is lower than 500 ma. In addition to digital signals and analog signals, it supplies power for RF power amplifier. The performance of the VBAT power supply is a critical path to module's performance and stability. The peak input current at the VBAT pin can be up to 2 A when the signal is weak and the module works at the maximum transmitting power. The voltage will encounter a drop in such a situation. The module might restart if the voltage drops lower than 3.3 V. Thus a large capacitor (e.g. 100 μf tantalum capacitor or 470 μf aluminum capacitor) with low ESR must be installed near the VBAT to avoid or reduce the voltage drop caused by the RF power amplifier. Figure 3-1 shows the burst current and the voltage drops. Figure 3-1 Current peaks and voltage drops 2 A Input Current 3.9 V Voltage 3.3 V Keep above 3.3 V 0 ms 3.7 ms 7.4 ms 10.7 ms T Copyright Neoway Technology Co., Ltd 8

16 Figure 3-2 shows a recommended power supply design for the module. Figure 3-2 Power supply design Current testing point VBAT I_max Power Supply C1 10uF I_max 2A D1 C1 C2 C3 C4 WM uF 1.1A 470uF 0.8A 1000uF 0.6A Close to the pins The current test results vary with the internal impedance of the ESR capacitors and power supply. In the above circuit, you can use TVS diode at D1 to enhance the performance of the module during a burst. A 100 μf capacitor with low ESR or 470 μf aluminum capacitor is expected at C1 to reduce voltage drops during bursts. In case of Li-ion cell battery used, a 220 μf tantalum capacitor may be applicable because the battery has low internal impedance. In addition, you need to add 0.1 μf, 100 pf, and 33 pf filter capacitors to filter high frequency interference. A controllable power supply is preferable if the module is used in harsh conditions. The WM620 module might fail to reset in remote or unattended applications, or in an environment with great electromagnetic interference (EMI). You can use the EN pin on the LDO or DC/DC chipset to control the power supply as shown in Figure 3-3 if you adopt 5 V power supply. MIC29302WU in the following figure is an LDO and it can output 3 A current to ensure the performance of the module. Figure 3-3 Reference design of power supply controlled by MIC29302 VCC_EN VCCIN C1 100uF TAN C2 0.1uF EN VOUT MIC29302WU VIN ADJ R1 10K R2 4.75K C3 C4 T1 470uF 0.1uF TVS TAN 5V VCC_MAIN The alternative way is to use a p-mosfet to control the module's power supply, as shown in Figure 3-4. This way is used if the power supply system does not consist of an EN pin. When the MCU detects the exceptions such as no response from the module or GPRS disconnection, power-off/on can rectify the module exceptions thoroughly. In Figure 3-4, the module is powered on when VCC_EN is set to high level. Copyright Neoway Technology Co., Ltd 9

17 Figure 3-4 Reference design of power supply controlled by p-mosfet VDD_3.9V INPUT Q1 C1 C2 D1 C3 + C4 C5 C6 R4 10 uf 0.1 uf 100K 470 uf 10 uf 0.1 uf R3 10K TVS 5V 33 pf VBAT OUTPUT VCC_EN 2K R1 R2 10K Q2 In the above circuit, Q2 is added to eliminate the need for a high enough voltage level of the host GPIO. In case that the GPIO can output a high voltage greater than VDD_3.9V - V GS(th), where V GS(th) is the Gate Threshold Voltage, Q2 is not needed. Reference components: Q1 can be IRML6401 or Rds(on) p-mosfet which has higher withstand voltage and drain current. Q2: a common NPN transistor, e.g. MMBT3904; or a digital NPN transistor, e.g. DTC123. If digital transistor is used, delete R1 and R2. C4: 100 μf tantalum capacitor rated at 6.3V; or 470 μf aluminum capacitor. Protection It is strongly recommended that you add a TVS diode (V RWM=5 V) to the VBAT power supply. For some stable power supplies, zener diodes can decrease the power supply overshoot. SMAJ5.0A/C, SMBJ5.0A/C, MMSZ5231B1T1G from ONSEMI, and PZ3D4V2 from Prisemi are options. Trace The primary loop lines for VBAT on PCB must support the safe transmission of 2 A current and ensure no obvious loop voltage decrease. Therefore, the trace width is required greater than 1.5 mm and the ground should be as complete as possible VRTC VRTC is the power supply pin of RTC inside the module to ensure that the clock works properly even though the module encounters exceptional power failure. It can be connected to external battery or supercapacitor. When VBAT works properly, VRTC outputs 2 ma current to charge the backup battery or the capacitor. When VBAT is disconnected, the battery or capacitor will supply power for RTC in short time. If you use a capacitor rather than a backup battery, connect the capacitor to the VRTC and then ground the capacitor. The capacitor must be charged before it supplies power for RTC in an exceptional situation. Copyright Neoway Technology Co., Ltd 10

18 Figure 3-5 shows the reference design of the VRTC power supply. Figure 3-5 RTC reference design WM620 Backup Battery C1 R1 2K Capacitor VRTC RTC Circuit The capacity of the supercapacitor is dependent on the duration of exceptional power failures. Table 3-2 shows the capacity matching the power failure duration. Table 3-2 Capacity matching power failure duration Power Failure Duration Capacity Encapsulation (X7R) 0.5 s 1.5 µf s 3.3 µf s 4.7 µf s 6.8 µf VDD VDD_1.8V and VDD_2.6V are two power supply output pins, which can bear 20 ma in normal situation. It is recommended that you use them only for level shifting. These two pins do not stop output after the module enters the sleep mode ON_OFF Pin and Power-on Procedure Prior to turning on the module, start the host MCU and complete the UART initialization. Otherwise conflictions may occur during initialization due to unstable conditions. ON/OFF is a low level pulse active input, used to turn on or off the module. It is pulled up to 1.8V internally by a 200KΩ resistor and controlled by external OC. Figure 3-7 shows its pulse width and power-on procedure. When the WM620 is powered on, the VDD_2.6V pin will be pulled up and keep 2.6 V DC output. The UART will send +EIND:8 after the module is powered on properly and send +EUSIM:1 after the USIM card is identified. Then the module is ready to response AT commands. If the module does not identify the USIM card, the UART will send +EIND:8+EUSIM:ERROR. Copyright Neoway Technology Co., Ltd 11

19 While the module is on, keep the ON_OFF pin low level for 2 seconds. Then the module enters shutdown procedure and will be off in 5 seconds. Another approach to turn off the module is using AT commands. For details, see Neo_WM620 WCDMA Module AT Command. Keep ON_OFF low level or connecting to, and WM620 can start automatically when it is powered on. Figure 3-6 shows the circuit of ON_OFF controlled by high level pulse. Figure 3-6 Reference circuit of ON_OFF controlled by high level C3 is close to the pin. ON_OFF MCU ON_OFF 2K VT2 C3 10 nf WM620 10K The ON_OFF pin might encounter pulse interference generated by ESD. It is recommended that you parallel a 10 nf capacitor connected to the ground to protect the ON_OFF pin. It is not recommended that you connect the ON_OFF pin to ground to start the module because it will affect the ESD feature of the module. The ON_OFF pin can control the module startup and shutdown. Do not repeat triggering this pin. Otherwise, the startup or shutdown might fail. For example, the user plans to start up the module but gives low level pulse for twice, resulting in shutdown. The shutdown function of the ON_OFF pin is controlled by the software. If the software is not running properly, the module cannot shut down properly. Figure 3-7 shows the power-on procedure of the WM620 module. Copyright Neoway Technology Co., Ltd 12

20 Figure 3-7 Power-on procedure VBAT 0.5s<t<1s 1.6V<V H 2.5s<t<5s ON_OFF V L <0.5V RESET_N USB_DP 4s 4.6s Power-on Procedure Power-off Procedure RESET RESET is a hard reset input pin that is pulled up internally by a resistance and activated by low level signal. Low level pulse longer than 20 ms can reset the WM620 module. After resetting the module, you must power on the module again. The recommended reset pulse is 50 ms, and cannot exceed 2 seconds. Otherwise, the WM620 module will be powered off. If you keep the ON_OFF pin low level or connecting to, the WM620 can restart automatically once you reset the module. Figure 3-8 shows the reference design of reset circuit. Figure 3-8 Reset circuit R6 and C3 are close to the pin. MCU RESET R5 2K VT2 R6 R6 100 C3 10nF RESET WM620 10K The RESET pin is sensitive to pulse. Place a 10 nf filter capacitor close to the pin to filter natural interference. Ensure complete ground around the trace of this pin and dig holes on both side of the trace. If the level from the external MCU exceeds 1.8 V, OC control is recommended. Leave the pin not connected if you do not use it. Copyright Neoway Technology Co., Ltd 13

21 The module works in complicated environment. It might encounter halt or other abnormities. Therefore, you must take automatic restore into consideration when designing your products. The following two methods are recommended: Control the RESET pin (emergency shutdown) so that you can set low level for hard shutdown. Perform the soft shutdown process by referring to Neo_WM620 WCDMA Module AT Command Set. Five seconds later, power off or reset the module. Otherwise, the program might be damaged during the hard shutdown if the module is reading or writing information in the memory. 3.2 Running Status Indication LED Indicator Table 3-3 LED indicator Pin Name I/O Function Remarks SIG_LED O Indicates running status Min Typical Max When the module is running, the LED indicator is driven by the SIG_LED to indicate different running status with its various blink behaviors. For details, see Neo_WM620 WCDMA Module AT Command Set. Module Status LED Status 1 Have registered 2G network and been idle Blink (500ms ON / 1500ms OFF) 2 Have registered 3G network and been idle Blink (100ms ON / 2900ms OFF) 3 Searching networks Blink twice (100 ms ON/100 ms OFF/100 ms ON/2700 ms OFF) 4 Service (Voice or data) Blink (125ms ON /125ms OFF) The LED can be directly connected to this pin with a resistor in series. For better luminance, drive the LED with a transistor instead. The LED's brightness depends on the value of R1 and VCC. Figure 3-9 LED indicator SIG_LED VCC SIG_LED 2K 470 R1 WM620 1K WM620 10K Copyright Neoway Technology Co., Ltd 14

22 3.2.2 RING Pin PIN Name I/O Function DC Characteristics (V) 51 RING O Ring output Min Typical Max Calling: Once a voice call is coming, UART output "RING" character strings and meanwhile the RING pin outputs 250 ms low level pulses at 4s period. After the call is answered, the high level restores. Figure 3-10 RING indicator for incoming call 250ms 250ms 4S SMS: Upon receipt of SMS, the module outputs one 600 ms low level pulse. Figure 3-11 RING indicator for SMS 600 ms You can change the pulse periods via AT commands. For details, see Neo_WM620 WCDMA Module AT Command Set. 3.3 USIM Card Interface Table 3-4 SIM Card Interface PIN Name I/O Function Remarks 13 V_SIM PWR SIM card power output 1.8/3.0 V 14 SIM_RST DO SIM card clock output 1.8/3.0 V 15 SIM_DATA DO SIM card reset output 1.8/3.0 V 16 SIM_CLK I/O SIM card data input/output 1.8/3.0 V Copyright Neoway Technology Co., Ltd 15

23 WM620 supports 3.0 V and 1.8 V USIM cards. USIM_DATA need to be externally pulled up to USIM_VCC by a 10 KΩ resistor. USIM_CLK works at 3.25MHz typically. Figure 3-12 Reference design of USIM card interface USIM_DATA 20 USIM_CLK USIM_RST K CLK RST DATA VPP USIM_VCC VCC WM620 T1 T2 T3 T4 C1 1 uf USIM Card Figure 3-12 shows reference circuit design of the USIM card. ESD protectors, such as ESD diodes (lower than 33 pf) or ESD varistors, are recommended on the USIM signals, especially in automotive electronics or other applications with badly ESD. In Figure 3-12, T1 to T4 should be placed close to the USIM socket. In other applications, replace ESD diodes with 22 pf to 33 pf grounding capacitors. The total distributed capacitance, including the junction capacitance of the ESD diode or other devices, cannot be greater than 120 pf. Figure 3-13 Recommended ESD diode array USIM_RST 1 L1 L3 4 USIM_DATA 2 USIM_CLK 3 L2 L4 5 USIM_VCC If you use 6-pin SIM card sockets, MCP-C713(H2.8) is recommended. Figure 3-14 shows its encapsulation. Figure 3-14 Reference of SIM card socket Copyright Neoway Technology Co., Ltd 16

24 The pins of USIM card socket: Pin 1 USIM_CLK Pin 3 USIM_RST Pin 5 USIM_VCC Pin 2 USIM_ DATA Pin 4 USIM_VPP Pin 6 USIM signal is sensitive to GSM TDD noise and RF interference. So, the PCB design should meet the following requirements: Avoid bifurcation at PCB trace of SIM_CLK. Ensure as short PCB traces of USIM_DATA and USIM CLK as possible and surround the traces with copper. RF traces or RF connector should be far away from the USIM card and USIM card traces. Ensure that the USIM traces are as smooth as possible. Place ESD diodes or filter capacitors close to the USIM card. 3.4 USB Interfaces Table 3-5 USB interface Pin Signal I/O Function Remarks 18 USB D+ I/O High-speed USB differential data, (+) 19 USB D- I/O High-speed USB differential data, (-) 20 V_USB PWR USB Power Input voltage 3.3 to 5.5 V. The WM620 module is compliant with USB 2.0 full speed device. The USB 2.0 specification requires that the hosts such as computers support three USB speeds: low-speed (1.5 Mbit/s), full-speed (12 Mbit/s) and high-speed (480 Mbit/s). The V_USB pin is a USB power supply input. Parallel ESD diodes respectively close to the three signals. The following circuit between the module and a computer is recommended. Copyright Neoway Technology Co., Ltd 17

25 Figure 3-15 Reference USB circuit V_USB USB_D USB_D VBUS UTXD USB_DM URXD USB_DP RTS CTS DCE DTE The USB circuit design should comply with the USB 2.0. The traces of USB_D+ and USB_D- must be routed as a group of differential pair with 90 Ω differential impedance. The USB differential pair should be routed side-by-side and on the same layer. USB_D+ and USB_D- is a pair of high speed signals, so the trace lengths should match as well as possible. USB interface must be connected or set aside the relevant test points to facilitate subsequent firmware upgrade or debugging. 3.5 UART Table 3-6 UART Pin Signal I/O Function Remarks 52 CTS I High-speed UART to send data 53 RTS O High-speed UART ready for receiving data 54 RXD I High-speed UART receive data input (allow 3 V input at most) 55 TXD O High-speed UART transmit data output Basic Descriptions of UART UART is used for AT commands, data sending/receiving, etc. Copyright Neoway Technology Co., Ltd 18

26 The UART of WM620 works at 2.6 V CMOS logic level. The voltages for input high level should not exceed 3.0 V. Supported baud rates are 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, , , , bit/s, and the default rate is bit/s. Figure 3-16 shows the signal connection between the module (DCE) and the terminal (DTE). Figure 3-16 Signal connection between DCE and DTE RXD TXD RTS CTS UTXD URXD CTS RTS DCE DTE The hardware flow control of the WM620 module is disabled by default. You can use AT+IFC=2,2 to enable the hardware flow control function and disable it by running AT+IFC=0,0. The setting will not be saved after the module is shut down. For more details about the commands, see Neo_WM620 WCDMA Module AT Command Set. The hardware flow control is implemented by AT commands together with CTS. After you use the AT commands to enable the hardware flow control function, set CTS low level so that the module can communicate via UART port. If the CTS pin is set to high level, the UART port cannot communicate. Leave CTS and RTS not connected if you do not need the hardware flow control function. Copyright Neoway Technology Co., Ltd 19

27 3.5.2 Level Shifting for UART If the UART is interfacing with a MCU that has 3.3 V logic levels, a resistor should be connected in series with the signals. Figure 3-17 Recommended circuit between 3.3V MCU and UART MCU_UTXD 200 RXD 33 pf MCU_URXD 200 TXD 33 pf If the UART is interfaced with an MCU that has 5 V logic levels, level shifting is required for both UART receive and transmit. Figure 3-18 shows a reference circuit. Figure 3-18 Recommended circuit between 5V MCU and UART VCC_IN VCC_OUT R2 4.7K R3 10K INPUT Q1 OUTPUT Reference components: R2: 2K-10K. The higher rate the UART works at, the smaller value used. R3: 4.7K-10K. The higher rate the UART works at, the smaller value used. Q1: MMBT3904 or MMBT2222. High-speed transistors are preferred. Logic level: DTE 5 V >DCE 2.6 V Copyright Neoway Technology Co., Ltd 20

28 INPUT is connected to TXD of the MCU and VCC_IN is connected to the 5 V power supply of the external device. OUTPUT is connected to RXD of the module and VCC_OUT is connected to VDD_2.6V of the module. Level shifting between RXD of the MCU and TXD of the module can be implemented in the same way. This design can be also used for RING. Avoid spark or fault on UART during the power-on procedure of the module. Do not send any data to UART within 5 seconds after the module is turned on. 3.6 Sleep Mode The sleep mode of WM620 is controlled in two ways: UART and USB. The module can receive voice and SMS message in sleep mode controlled by UART or USB. Upon receiving SMS messages, voice, or data, the module is woken up automatically. Then you can execute AT commands and the module will enter the sleep mode after the service is end UART Control If the module (DCE) communicate with DTE via UART, connect them as shown in Figure 3-19 to control the sleep mode. SLEEP_IN controls the status of the sleep mode and can be used to wake up the module from the sleep mode. Figure 3-19 Sleep mode controlled by UART RXD TXD RTS CTS SLEEP_IN DCE UTXD URXD CTS RTS GPIO DTE When the V_BUS pin of USB is not connected, send AT+ENPWRSAVE=0 via UART to allow the module to enter the sleep mode. If the SLEEP_IN pin is set to low level, the module enters sleep mode; if SLEEP_IN is set to high level, the module is woken up. To disable the sleep mode, execute AT+ENPWRSAVE=1. Then, the module will never enter the sleep mode. Copyright Neoway Technology Co., Ltd 21

29 3.6.2 USB Control If the module (DCE) communicates with DTE via USB port, the following two methods are recommended to bring the module into the sleep mode. 1. When the DTE supports the Suspend state of USB ports, you can use the design in Figure Figure 3-20 Sleep mode controlled by USB (a) DCE DTE Send AT+ENPWRSAVE=0 via USB port to allow the module to enter the sleep mode. Enable the USB Suspend state on the DTE. Then the module enters the sleep mode. 2. When the DTE does not support the Suspend state of USB ports, adopt the design in Figure Figure 3-21 Sleep mode controlled by USB (b) POWER SWITCH V_BUS USB_D+ USB_D- VCC USB_D+ USB_D- V_BUS USB_D+ USB_D- GPIO VCC USB_D+ USB_D- DCE DTE Send AT+ENPWRSAVE=0 via USB to allow the module to enter the sleep mode. Copyright Neoway Technology Co., Ltd 22

30 The DTE controls the sleep mode of the module by controlling the power supply via GPIO. If the power supply is switched off, the module enters the sleep mode; if the power supply is on, the module will be woken up. 3.7 Audio Interface Table 3-7 Audio interface Pin Signal I/O Function Remarks 28 EAR_P AO Earphone amplifier output (+) Receiver or 32Ω earphone 29 EAR_N AO Earphone amplifier output (-) driving output 30 MIC_1N AI Microphone #1 input (-) Vpp 200 mv 31 MIC_1P AI Microphone #1 input (+) Vpp 200 mv 32 MIC_2P AI Microphone #2 input (-) Vpp 200 mv 33 MIC_2N AI Microphone #2 input (+) Vpp 200 mv 35 SPK_P AO Speaker amplifier output (+) 36 SPK_N AO Speaker amplifier output (-) Audio channels are switched by executing AT+HANDFREE commands: AT+HANDFREE=0 for receiver mode; AT+HANDFREE=1 for speaker mode. For more details about audio channel switch, see Neo_WM620 WCDMA Module AT Command Set. The following figures shows typical audio interfaces of WM620. The earphone output pins are directly connected to the receiver. Parallel a bypass capacitor for each pin. The capacitor of 100 pf or less is expected to optimize performance in each design. The output power for the different earphones is typically 35 mw for a full-scale +3 dbm sine wave into a 32 Ω speaker. Figure 3-22 Reference design of MIC differential connections MIC 100 pf 33 pf MIC1P Earpiece 32-Ohms ESD Protection 33 pf 100 pf 100 pf MIC1N EAR_P EAR_N WM620 Copyright Neoway Technology Co., Ltd 23

31 Figure 3-23 Reference design of single-end input MIC interface MIC 100 pf MIC1P Earpiece 32-Ohms ESD Protect 0.1 uf 100 pf 100 pf MIC1N EAR_P EAR_N WM620 Figure 3-24 Reference design for speaker differential output Speaker 8-Ohms ESD Protection 33 pf 10 pf SPK_P SPK_N 33 pf 10 pf WM620 Figure 3-25 Reference design for speaker single-ended output SPK_P Speaker 8-Ohms ESD Protection 33 pf 10 pf SPK_N WM620 Table 3-8 MIC voltage and current MIC Min. Typical Max. Unit MIC voltage V Copyright Neoway Technology Co., Ltd 24

32 MIC current ma Mute mode ua Idle status ua Table 3-9 EAR parameter EAR Min. Typical Max. Unit Power voltage supply V Impedance between EAR_P and EAR_N Ω Output power 50 mw Table 3-10 SPK parameter SPK Min. Typical Max. Unit Power voltage supply V Impedance between SPK_P and SPK_N Ω Output power 50 mw Audio signals are analog and should be protected from interference and ESD. Differential signal trace is required for dual-ended signals. You can add audio amplifier to output circuits to enhance the audio signals. Do not ground the audio output pin directly. Otherwise, some abnormity might occur to the module. 3.8 RF Interface RF Design and PCB Layout A 50 Ω antenna is required. VSWR ranges from 1.1 to 1.5. The antenna should be well matched to achieve best performance. It should be installed far away from high speed logic circuits, DC/DC power, or any other strong disturbing sources. For multiple-layer PCB, the trace between the antenna pad of module and the antenna connector, should have a 50 Ω characteristic impedance, and be as short as possible. The trace should be surrounded by ground copper. Dig plenty of via holes to connect this ground copper to main ground plane. If the trace between the module and connector has to be longer, or built-in antenna is used, a π-type matching circuit should be added, as shown in Figure The types and values of C1, L1, and L2 should be verified by test using network analyzer instrument. If the characteristic impedance is well matched, and VSWR requirement is met, just use a 0 Ω resistor for C1 and leave L1, L2 un-installed. Copyright Neoway Technology Co., Ltd 25

33 Avoid any other traces crossing the antenna trace on neighboring layer. Figure 3-26 Reference design for antenna interface RF_ANT ANT WM620 L1 C1 L2 On two-layer boards which cannot control impedance properly, the RF route should be as short and smooth as possible and at a width of 0.8 mm to 1.0 mm; the RF is 1 mm away from the ground. Figure 3-27 shows a two-layer board application. The RF is connected to GSC RF connector through traces on PCB, which is connected to the antenna via cable. Figure 3-27 RF layout reference On the PCB, keep the RF signals and RF components away from high-speed circuits, power supplies, transformers, great inductors, the clock circuit of single-chip host, etc. Copyright Neoway Technology Co., Ltd 26

34 4 RF Features 4.1 Work Band Table 4-1 Work band Work Band Uplink Downlink UMTS 2100 (Band I) MHz MHz UMTS 1900 (Band II) MHz MHz UMTS 850 (Band V) MHz MHz UMTS 900 (Band VIII) MHz MHz GSM MHz MHz GSM MHz MHz GSM 1800 (DCS) MHz MHz GSM 1900 (PCS) MHz MHz 4.2 Transmitting Power and Receiving Sensitivity Transmitting Power Transmitting power is an important indicator of the module performance. Table 4-2 shows the maximum working power of WM620 and the corresponding 3GPP standards. Table 4-2 Transmitting power (unit: dbm) Work Band 3GPP (dbm) Testing Value (dbm) Min. Typical Max. GSM850 GSM900 GSM1800 GSM1900 GMSK(1Tx Slot) 31~ PSK(1Tx Slot) 24~ GMSK(1Tx Slot) 31~ PSK(1Tx Slot) 24~ GMSK(1Tx Slot) 28~ PSK(1Tx Slot) 23~ GMSK(1Tx Slot) 28~ PSK(1Tx Slot) 23~ Band I (2100 MHz) 21~ Band II (1900 MHz) 21~ Copyright Neoway Technology Co., Ltd 27

35 Band V (850 MHz) 21~ Band VIII (900 MHz) 21~ Receiving Sensitivity Receiving sensitivity is another important performance indicator of the wireless modules. It measures the module's capability to receive weak signals. Table 4-3 lists WM620 data obtained in lab tests for different bands and corresponding 3GPP standards. Table 4-3 Receiving sensitivity (Unit: dbm) Work Band 3GPP (dbm) Testing Value (dbm) Min. Typical Max. GSM850 GSM900 GSM1800 GSM1900 GMSK (BER<2.43%) 8PSK (MCS5, BLER<10%) GMSK (BER<2.43%) 8PSK (MCS5, BLER<10%) GMSK (BER<2.43%) 8PSK (MCS5, BLER<10%) GMSK (BER<2.43%) 8PSK (MCS5, BLER<10%) < < < < < < < < Band I (BER<0.1%) < Band II (BER<0.1%) < Band V (BER<0.1%) < Band VIII (BER<0.1%) < The data in the above tables is obtained by connecting the module to RF test instrument (e.g. CMU200, CWM500, or Agilent8960) in lab tests. It is for reference only. Copyright Neoway Technology Co., Ltd 28

36 5 Electric Features and Reliability 5.1 Electric Feature Table 5-1 Electric feature of the module Parameter Minimum Value Typical Value Maximum Value VBAT V_BUS I MAX ADC VRTC VDD_1.8V VDD_2.6V Refer to the level design circuits for the output pins of the module. For input pins, design their circuits strictly complying with their voltage ranges. Ensure that the level at the input pin is not greater than 0.5 V. Otherwise, the module cannot identify the level correctly. 5.2 Temperature Table 5-2 Temperature Feature (Unit: ºC) Module Status Minimum Value Typical Value Maximum Value Working Storage If the module works in temperature exceeding the thresholds, its RF performance (e.g. frequency deviation or phase deviation) might be worse. 5.3 Current Table 5-3 and Table 5-4 lists the current of WM620 in different modes at 25 ºC and 3.9V. During the test, the USB is disconnected. Copyright Neoway Technology Co., Ltd 29

37 Table 5-3 Operating current (Unit: ma) Band Current GSM850 (PCL=5) 245 GSM (full speed) GSM900 (PCL=5) 232 GSM1800 (PCL=0) 121 GSM1900 (PCL=0) 132 GPRS (Gamma=3, CS4, class12) GSM850 GSM900 GSM1800 GSM1900 (4 up/1down) 692 (1 up/4 down) 234 (4 up/1down) 632 (1 up/4 down) 223 (4 up/1down) 500 (1 up/4 down) 178 (4 up/1down) 520 (1 up/4 down) 190 Band I 512 WCDMA (full speed@24dbm) Band II 521 Band V 476 Band VIII 485 Band I 534 HSDPA Band II 541 Band V 498 Band VIII 503 EDGE EDGE (full speed, Gamma=3) EDGE EDGE EDGE Table 5-4 Current in sleep mode Band GSM/GPRS/EDGE Sleep&DRX=2 4 Sleep&DRX=9 3 Current Copyright Neoway Technology Co., Ltd 30

38 WCDMA/HSDPA Sleep 3 The data in the above tables is typical values obtained during tests in lab. It might be a little bit different in manufacturing. Also, the test results might be various due to different settings or testing methods. 5.4 ESD Protection Electronics need to pass sever ESD tests. The following table shows the ESD capability of key pins of our module. It is recommended that you add ESD protection to those pins (SIM card, RF, ON_OFF, RESET, etc.) in accordance to the application to ensure your product quality when designing your products. Table 5-5 ESD feature of the module Testing Point Contact Discharge Air Discharge VBAT, ±6KV ±12KV USB, UART ±4KV ±8KV Antenna ±6KV ±12KV Other Interfaces ±2KV ±4KV Copyright Neoway Technology Co., Ltd 31

39 6 Typical Circuits C3 is close to the pin. ON_OFF 2K VT2 C3 WM620 MCU ON_OFF 10 nf 10K R6 and C3 are close to the pin. MCU RESET R5 2K VT2 R6 R6 100 C3 10nF RESET WM620 10K L5 MIC1_P C14 1 MIC1_N EAR_P 100 pf L3 L1 C X26 EAR_N L4 100 pf C18 C19 4 C13 C pf 100 pf CON-RJ pf 100 pf Copyright Neoway Technology Co., Ltd 32

40 V_MAIN R18 1K D4 RING C uf C1 100 uf C uf C2 100 pf VBAT R2 1K D2 SIG_LED C uf SLEEP TXD RXD RTS CTS RING HKAINO SIG_LED VCION ON_OFF RF_ANT_F UIM_VCC UIM_RST UIM_DATA UIM_CLK USB_D+ USB_D- V_BUS VBAT1 VBAT2 RESET V_MSME_1.8V V_MSMP_2.6V EAR_1P EAR_1N MIC_1N MIC_1P SPKR_N SPKR_P MIC2_N MIC2_P C8 C17 2.0pF 100 pf 1 C24 2.0pF SPKR_N SPKR_P MIC2_N MIC2_P V_MAIN V_UIM_3V UIM_RST UIM_DATA UIM_CLK USB_D+ USB_D- VCC5V RESET_IN V_MSME_1.8V V_MSME_2.6V EAR1P EAR1N MIC1_N MIC1_P SLEEP_IN TXD_1 RXD_1 RING SIG_LED ON_OFF C4 C3 C2 C1 100 pf 0.1 uf 100 uf 1000 uf Copyright Neoway Technology Co., Ltd 33

41 7 Mounting the Module onto the Application Board WM620 is compatible with industrial standard reflow profile for lead-free SMT process. The reflow profile is process dependent, so the following recommendation is just a start point guideline: Only one flow is supported. Quality of the solder joint depends on the solder volume. Minimum of 0.15mm stencil thickness is recommended. Use bigger aperture size of the stencil than actual pad size. Use a low-residue, no-clean type solder paste. 8 Package WM620 modules are packaged in sealed bags on delivery to guarantee a long shelf life. Package the modules again in case of opening for any reasons. If exposed in air for more than 48 hours at conditions not worse than 30 C/60% RH, a baking procedure should be done before SMT. Or, if the indication card shows humidity greater than 20%, the baking procedure is also required. The baking should last for at least 12 hours at 90. Copyright Neoway Technology Co., Ltd 34

42 9 Abbreviations ADC AFC AGC AMR CSD CPU DAI DAC DCE DSP DTE DTMF DTR EFR EGSM EMC EMI ESD ETS FDMA FR GPRS GSM HR IC IMEI LCD LED MS PCB PCS Analog-Digital Converter Automatic Frequency Control Automatic Gain Control Acknowledged multirate (speech coder) Circuit Switched Data Central Processing Unit Digital Audio interface Digital-to-Analog Converter Data Communication Equipment Digital Signal Processor Data Terminal Equipment Dual Tone Multi-Frequency Data Terminal Ready Enhanced Full Rate Enhanced GSM Electromagnetic Compatibility Electro Magnetic Interference Electronic Static Discharge European Telecommunication Standard Frequency Division Multiple Access Full Rate General Packet Radio Service Global Standard for Mobile Communications Half Rate Integrated Circuit International Mobile Equipment Identity Liquid Crystal Display Light Emitting Diode Mobile Station Printed Circuit Board Personal Communication System Copyright Neoway Technology Co., Ltd 35

43 RAM RF ROM RMS RTC SIM SMS SRAM TA TDMA UART VSWR Random Access Memory Radio Frequency Read-only Memory Root Mean Square Real Time Clock Subscriber Identification Module Short Message Service Static Random Access Memory Terminal adapter Time Division Multiple Access Universal asynchronous receiver-transmitter Voltage Standing Wave Ratio Copyright Neoway Technology Co., Ltd 36