MAX5825A Evaluation Kit Evaluates: MAX5823/MAX5824/ MAX5825A/MAX5825B

Transcription

1 9-60; Rev 0; / MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B General Description The MAX8A evaluation kit (EV kit) demonstrates the MAX8A -bit, 8-channel, low-power DAC with selectable internal references and buffered voltage output. The IC comes in a 0-pin TSSOP package. The EV kit provides control to change the DAC s outputs, power operations, references, and watchdog timer settings. The IC features a watchdog function that can be enabled to monitor the I/O interface for activity and integrity. The EV kit includes a USB-to-I C 00kHz interface circuit. The EV kit features Windows XP M -, Windows Vista M -, and Windows M -compatible software that provides a simple graphical user interface (GUI) for exercising the IC s features. The EV kit comes with the MAX8AAUP+ installed, which is the -bit I C version. Contact the factory for samples of the pin-compatible MAX8AUP+ (8-bit), MAX8AUP+ (0-bit), and MAX8BAUP+ (-bit) versions. Ordering Information appears at end of data sheet. S Wide Input Supply Range:.V to.v Features S Independent Voltage for Digital I/O:.8V to.v S Demonstrates.Fs (typ) Settling Time of Buffered Output S Precision Selectable Internal References Supporting.08V,.00V, and.096v S Demonstrates User-Supplied External Reference S Three Selectable Power-Down Impedance ki, 00kI, or High Impedance S Power-Up Reset to Midscale or Zero S Supports Entire Family of Octal SPI/I C DACs S Windows XP-, Windows Vista-, and Windows -Compatible Software S USB-Powered (Cable Included) S Demonstrates Configurable Interface Watchdog Timer S Fully Assembled and Tested with Proven PCB Layout Figure. MAX8A EV Kit Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Component List DESIGNATION QTY DESCRIPTION C, C, C C, C, C, C0, C, C9, C0, C, C6 C9, C6 C C6 C9, C, C C0 0 C, C C, C6, C0 C 8 C8 C C, C 0FF Q0%, 0V XR ceramic capacitors (080) Murata GRMBRA06K 0.FF Q0%, 6V XR ceramic capacitors (060) Murata GRM88RC0K 00pF Q%, 0V C0G ceramic capacitor (060) Murata GRM88CH0J Not installed, ceramic capacitors (060) 0pF Q%, 0V C0G ceramic capacitors (060) Murata GRM88CH00J FF Q0%, 6V XR ceramic capacitors (060) Murata GRM88RC0K.FF Q0%, 0V XR ceramic capacitor (080) Murata GRM9R6AK 0.0FF Q0%, V XR ceramic capacitor (060) Murata GRM88REK pf Q%, 0V C0G ceramic capacitors (060) Murata GRM88CH0J D Green LED (060) DAC0 DAC, IRQ, REF, +V Red multipurpose test points Black multipurpose test point H 0 Not installed, 0-pin ( x ) header H 8-pin ( x 9) header JU, JU, JU9, JU0, JU, JU 6 -pin headers JU, JU, JU -pin headers JU6, JU, JU8, JU, JU -pin headers DESIGNATION QTY DESCRIPTION R, R, R8.kI Q% resistors (060) R MI Q% resistor (060) R, R8 R6 0.kI Q% resistors (060) R6, R I Q% resistors (060) R8 0I Q% resistor (060) R9 R, R6 0 Not installed, resistors (00) R9 R are short (PC trace); R6 is open R, R 0 Not installed, resistors (060) R9 00kI Q% resistor (060) U U -bit, 8-channel DAC (0 TSSOP) Maxim MAX8AAUP+ Microcontroller (68 QFN-EP*) Maxim MAXQ000-RAX+ U 0 Not installed, EEPROM (8 SO) U U U6 U U8, U9, U0 USB Y Y Shunts *EP = Exposed pad. UART-to-USB converter ( LQFP).V LDO regulator ( SC0) Maxim MAX8EXK+.V LDO regulator ( SC0) Maxim MAX8EXK+.V voltage reference (8 SO) Maxim MAX6AASA+ Level translator (0 FMAX M ) Maxim MAX80EUB+ USB type-b, right-angle PC-mount receptacle 6MHz crystal (HCM9) Hong Kong X tals SSM6000NHK88F0-0 6MHz crystal (HCM9) Hong Kong X tals SSL60000NHK88F0-0 USB high-speed A-to-B cable (6 ft) PCB: MAX8A EVALUATION KIT µmax is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products

3 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Component Suppliers SUPPLIER PHONE WEBSITE Hong Kong X tals Ltd Murata Electronics North America, Inc Note: Indicate that you are using the MAX8A when contacting these component suppliers. MAX8A EV Kit Files FILES STALL.EXE MAX8A.EXE CDM0600.EXE UNSTALL.EXE USB_Driver_Help_00.PDF DESCRIPTION Installs the EV kit files on your computer Application program Installs the USB device driver Uninstalls the EV kit software USB driver installation help file Quick Start Required Equipment MAX8A EV kit (USB cable included) Windows XP, Windows Vista, or Windows PC with a spare USB port Digital voltmeter (DVM) Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation: ) Verify that jumpers JU JU are in their default position, as shown in Table. ) Visit to download the latest version of the EV kit software, 8ARxx. ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. ) Install the EV kit software on your computer by running the STALL.EXE program inside the temporary folder. The program files are copied to your PC and icons are created in the Windows Start Programs menu. During software installation, some versions of Windows may show a warning message indicating that this software is from an unknown publisher. This is not an error condition and it is safe to proceed with installation. Administrator privileges are required to install the USB device driver on Windows. ) Connect the USB cable from the PC to the EV kit board. A Windows message appears when connecting the EV kit board to the PC for the first time. Each version of Windows has a slightly different message. If you see a Windows message stating ready to use, then proceed to the next step. Otherwise, open the USB_Driver_Help_00.PDF document in the Windows Start Programs menu to verify that the USB driver was installed successfully. ) Start the EV kit software by opening its icon in the Start Programs menu. The EV kit software main window appears, as shown in Figure. 6) Within the DACs tab sheet, press the EXECUTE button in the Quick DAC Output Voltage group box. ) Use the S PCB pad for the negative terminal of the DVM and use the positive terminal to measure the voltage at the DAC_ test points. Verify that the voltages measured are.v. Maxim Integrated Products

4 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure. MAX8A EV Kit Software Main Window (DACs Tab) Maxim Integrated Products

5 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure. MAX8A EV Kit Software Main Window (Scripts Tab) Maxim Integrated Products

6 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure. MAX8A EV Kit Software Main Window (Configuration Status Tab) Maxim Integrated Products 6

7 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Detailed Description of Software The MAX8A EV kit software evaluates the MAX8A I C interface family of -/0-/8-bit DACs. The main software window has three tabs: DACs, Scripts, and Configuration Status. Within the DACs tab sheet (Figure ), the user can set the reference and the DAC outputs. The Scripts tab sheet (Figure ) allows the user to send a sequence of write commands to the eight DACs and load and save the write sequence. The Configuration Status tab sheet (Figure ) displays the configuration settings for each DAC. In addition, the software also allows the user to adjust the configuration, power, reset, and default settings. Demo Mode The EV kit software enters the demo mode when the USB connection is not detected. When in demo mode, all communication to the EV kit is disabled; however, most of the software is functional. Demo mode allows the user to evaluate the software without hardware connectivity. Part Selection The user must select the appropriate radio button in the Part Selection group box that corresponds to the installed Maxim IC DAC bits. I C Address When the software first starts up, the IC radio button is selected automatically if a valid I C address is on the bus. The Interface group box displays the I C address. If the address is not found, the software prompts the user to search for the I C address or place the software into demo mode. The software automatically detects the correct address from the drop-down list. See Table for a list of the I C addresses. Reference The reference default configuration is set to.v using the external voltage reference IC (U). The external.v reference can be connected between the EXT_REF pin and its corresponding ground. Select the External Ref radio button and type the reference voltage into the edit box. Removing the shunt from jumper JU allows internal reference options, which include.08v,.v, and.096v selection, by using the corresponding radio button. Make sure the VDD supply is greater or equal to the voltage reference selected for proper operation. When the EV kit uses the on-board +.V supply to power the IC, the.096v radio button selection will not provide the.096v. See the User-Supplied Reference section for further information. DAC Commands Within the DACs tab sheet shown Figure, the user can set the output of the DACs with two options. The first option is the Quick DAC Output Voltage group box that allows the user to write and load the CODE to all DACs. Set the desired output for each DAC using the corresponding slider and press the EXECUTE button. The second option is to write the return CODE, write the CODE, load the CODE, or write and load the CODE to the desired DAC using the drop-down lists and edit box within the Command group box. Press the EXECUTE button once all the settings are appropriately configured. DAC Commands (Script) Within the Scripts tab sheet shown in Figure, enter the desired Data on the left and choose the appropriate Command from the drop-down list in the Scripting group box. Pressing the EXECUTE button writes to the CODE and/or DAC registers and the Script Status changes from Incomplete to Complete. Refer to the MAX8A IC data sheet for a list of possible commands. If a sequence of commands needs to be performed, adjust all Data edit boxes and Commands drop-down list accordingly, and press the EXECUTE ALL button. To reset the Script Status to Incomplete, press the RESET SCRIPT button. Data Logging By pressing the SAVE button, the sequence of commands is saved into a text file. To recall the sequence, press the LOAD button and select the appropriate text file. Configuration Status The Configuration Status tab sheet shown in Figure displays the current status of the configuration, power, and default settings for each DAC. Read Back The EV kit reads back the return values, CODE values, DAC values, watchdog safety status, or power status. Select the appropriate Read radio button and press the EXECUTE button within the Read Back group box. Asynchronous CLR Checking the CLR Asserted checkbox in the Asynchronous Controls group box drives the CLR pin of the device low, which clears the content of both CODE and DAC registers. Unchecking the CLR Asserted checkbox drives the CLR pin high and writing new commands is allowed again. Maxim Integrated Products

8 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Asynchronous LDAC Checking the LDAC Asserted checkbox drives the LDAC pin of the device low, which allows writing to the CODE register and then automatically transfers to the DAC register to change the DAC s output. Unchecking the LDAC Asserted checkbox drives the LDAC pin high. To change the DAC outputs, the user must write to the CODE registers and then write to the DAC registers. Interface Watch Dog Use the Mask checkbox, Timeout edit box, and Safety Level radio buttons in the Interface Watch Dog group box to set the watchdog. The timeout time range that can be entered into the edit box is ms to 09ms. The user must allow enough timeout time to send data to the DAC(s). It is recommended that the user set the timeout time to the maximum time of 09ms since the time that Windows takes to communicate with the part can vary. In addition, configure the DAC output settings before pressing the EXECUTE button. The IRQ circle changes from white to red when the IRQ signal goes low. Refer to the MAX8/MAX8/MAX8 IC data sheet for a detailed description. Configuration The configuration command includes the Watch Dog radio buttons and the GATE_ENB, LDAC_ENB, and CLEAR_ENB checkboxes for selected DAC(s). See the Configuration Status tab sheet to monitor the settings on each DAC. Refer to MAX8/MAX8/MAX8 IC data sheet for a detailed description. Power The power command is selectable for individual DACs. When a DAC is selected, the channel is active. Other options include powering down with ki termination to, 00kI termination to, and high impedance. Once the appropriate selection is made, press the EXECUTE button. Reset The reset command allows the user to set or clear the gate, refresh or reset the watchdog timer, or issue a software reset or clear. Refer to the MAX8/MAX8/ MAX8 IC data sheet for a detailed description. Figure. Advanced User Interface Window (-Wire Interface Tab) Maxim Integrated Products 8

9 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Default The default command allows the user to set the default settings for individual DACs. Refer to MAX8/MAX8/ MAX8IC data sheet for a detailed description. Advanced User Interface There are two methods for communicating with the IC. The first is through the windows shown in Figure. The second is through the Advanced User Interface window shown in Figure. The Advanced User Interface window becomes available by selecting the Options Interface (Advanced User) menu item and allows execution of serial commands manually. This interface is not recommended unless the user has to change individual bits in the interface. Detailed Description of Hardware The MAX8A EV kit provides a proven layout for the MAX8A IC. An on-board reference (MAX6), USB interface circuitry, and jumpers to disconnect the onboard microcontroller are included on the EV kit. I C Address The I C address of the IC is determined by the shunt settings of jumpers JU and JU. See Table for all possible hexadecimal addresses. Figure 6. Jumper Callouts Maxim Integrated Products 9

10 Table. Jumper Settings (JU JU) JUMPER SHUNT POSITION DESCRIPTION JU JU JU JU JU JU6 JU JU8 JU9 JU0 JU - Do not install. -* Connects the SDA signal of the on-board microcontroller to the SDA pin of IC U. Not installed - Do not install. User-supplied SDA. Apply appropriate signal at header pin H-. -* Connects the SCL signal of the on-board microcontroller to the SCL pin of IC U. Not installed User-supplied SCL. Apply appropriate signal at header pin H-. -* Connects the ADDR0 pin of IC U to to determine the I C address. See Table. - Do not install. - Connects the ADDR0 pin of IC U to D to determine the I C address. See Table. -* Connects the ADDR pin of IC U to to determine the I C address. See Table. - Do not install. - Connects the ADDR pin of IC U to D to determine the I C address. See Table. - Connects the LDAC pin of IC U to. -* Connects the LDAC signal of the on-board microcontroller to the LDAC pin of IC U. - Connects the LDAC pin of IC U to. Installed* Connects the CLR signal of the on-board microcontroller to the CLR pin of IC U. Not installed Installed* User-supplied CLR. Apply the appropriate signal at header pin H-. Connects pullup resistor R to the I C SDA signal. Not installed Disconnects pullup resistor R from the SDA pin of IC U. Installed* Connects pullup resistor R to the I C SCL signal. Not installed Disconnects pullup resistor R from the SCL pin of IC U. -* Connects the pin of IC U to the on-board +.V supply. - Connects the pin of the IC U to a user-supplied power supply between +.V and +.V (_EXT). -* Connects the VDD pin of IC U to the on-board +.V supply - Connects the VDD pin of IC U to a user-supplied power supply between +.V and +.V (VDD_EXT). - User-supplied REF. The user must apply a voltage reference at the REF_EXT PCB pad. -* Connects the on-board voltage reference IC (U) to the REF pin of IC U. JU Installed* Connects the M/Z pin of IC U to VDD. Not installed Connects the M/Z pin of IC U to the 00kI pulldown resistor. JU -* Powers IC U using the USB supply. - Powers IC U using the user-supplied power supply. JU *Default position. MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Installed* Connects the additional bypass capacitor C6 on the REF pin of IC U. Not installed Disconnect the additional bypass capacitor C6 on the REF pin of IC U. Maxim Integrated Products 0

11 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Table. IC Address Settings SHUNT POSITION MAX8A ADDRESS (hex) JU (ADDR0) JU (ADDR) WRITE READ - - 0x0 0x Not installed - 0x 0x -* - 0x6 0x - Not installed 0x0 0x Not installed Not installed 0x 0x -* Not installed 0x6 0x - -* 0x8 0x9 Not installed -* 0xC 0xD -* -* 0xE 0xF *Default position. User-Supplied Power Supply The EV kit is powered completely from the USB port by default. To power the IC with a user-supplied power supply, move the shunt on jumper JU0 to the - position and apply a.v to.v power supply at the VDD_EXT and the nearest PCB pads on the EV kit. The on-board voltage reference (U) is powered from the USB interface circuit when the shunt is installed in the - position on jumper JU. To use the same external supply applied at the VDD_EXT PCB pad, move the shunt to the - position on JU. User-Supplied Reference The on-board voltage reference (U) generates a voltage reference of.v. The user can apply an external voltage reference by moving the shunt on jumper JU to the - position and applying between V and VDD at the REF_EXT PCB pad on the EV kit. If the internal reference is selected, the REF pin becomes an output. In this case, JU should be removed. User-Supplied I C To evaluate the EV kit with a user-supplied I C bus, remove shunts from jumpers JU and JU. Apply the user-supplied SDA signal to header pin H- and the user-supplied SCL signal to header pin H-. If pullup resistors are on the user-supplied interface, shunts must not be installed on jumpers JU and JU8. Connect the user-supplied I C ground to header pins H- or H-. User-Supplied IRQ, CLR, and LDAC Remove shunts from jumpers JU and JU6. Apply the user-supplied IRQ, CLR, and LDAC to header pins H-, H-, and H-, respectively. Connect the user-supplied signal ground to header pins H-, H-6, and H-8. Maxim Integrated Products

12 +.V +.V +.V U_MOSI R.kI U_SCL R8.kI U_SDA R9.kI MAXQ_K R.kI MAXQ_K R0.kI U_MISO R.kI U_CSB R.kI U_SCLK R.kI R6.kI MAXQ_K C µf +.V C µf +.V C µf +.V R C DATA SHDN R C DATA SHDN R C DATA SHDN +.V DVCC VCC U8 MAX80 +.V DVCC VCC U9 MAX80 +.V DVCC VCC U0 MAX80 C0 µf RST U_MOSI CLK 8 U_SCL IO 0 U_SDA C µf RST U_CLRB CLK 8 U_LDACB IO 0 U_MISO C µf RST U_CSB CLK U_SCLK 0 IO U_IRQ SDA SCL ADDR0 ADDR U_IRQ CLR LDAC C 0.µF U_MOSI U_MISO U_CLRB U_LDACB H R.kI R.kI I.C. I.C. JU TEMP U MAX6 N.C. OUT REF_EXT TRIM C6 0.µF JU C 00pF JU REF JU U_CSB SDA U_SDA JU8 SCL JU U_SCLK U_SCL JU ADDR0 JU ADDR C 0.µF JU6 R MI CLR R8.kI U_IRQ IRQ 6 JU 8 VDD JU LDAC 0 R9 00kI REF SDA SCL ADDR0 ADDR CLR IRQ LDAC M/Z U MAX8A VDD 0 9 DAC0 DAC DAC DAC DAC DAC DAC6 DAC VDD C 0.µF DAC0 C6 DAC C DAC C8 DAC C9 DAC C DAC C8 DAC6 C9 DAC C0 C 0µF +.V JU0 +V JU +.V JU9 VDD VDD_EXT _EXT S MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure a. MAX8A EV Kit Schematic (Sheet of ) Maxim Integrated Products

13 SEG0/P. USB +V C 0.µF +V +V R DO U DI R DC +V +V +.V R I R6 I C pf C pf +.V +V +V Y 6MHz R.kI C 0.0µF VOUT R8 0I D +.V 68 SEG/P HFX HFXOUT VDD 9 P6./T0/WKOUT 8 CTS 6 SEG9/P. SEG8/P.0 SEG/P0./T SEG6/P0.6/T SEG/P0./T SEG/P0./T0 SEG/P SEG/P0. SEG/P0. SEG0/P0.0 VADJ VLCD VLCD VLCD P./RX0/T P.0/TX0/T U FTBL 0 SEG/P. SEG/P. SEG/P.6 SEG/P. SEG6/P.0 SEG/P. SEG8/P. SEG9/P. SEG0/P. SEG/P. SEG/P.6 6 SEG/P. SEG/P.0 SEG/P. SEG6/P. SEG/P. U MAXQ000-RAX +.V C0 0.µF 0 +.V C9 0.µF C 0pF C 0pF SEG8/P./T SEG9/P./T SEG0/P.6/T6 SEG/P./T SEG SEG/COM SEG/COM SEG/COM COM0 P.0/TCK/T8 P./TDI/T9 U MAX P6./T0B/WKOUT0 DSR P6./T/OW_ 6 P6./TB/OW_OUT P6./T/T U_SDA P6.0/TB/T U_SCL RESET R6 R9 SHORT EP MAXQ_K MAXQ_K TXD C TCK TDO H 6 TMS RESET 8 TDI 9 0 TDO Y 6MHz R0 SHORT R SHORT TMS RTS R SHORT TDI DCD R SHORT TCK DSR RI TCK TDI MAXQ_K USBDM USBDP RSTOUT RESET P./MISO P.6/SCLK 0 P./MOSI 9 P./SS 8 P./TX/T P./RX/T0 6 OUT U_MISO U_SCLK U_MOSI U_CSB DTR RTS P./TMS TMS P./TDO TDO RESET RESET K C9 0.µF 6 VCC CS SK N.C. C6 µf OUT SHDN N.C. C 0µF C8.µF C µf +V C 0.µF +.V C 0.µF C8 0.µF C0 0.µF 8 XT XTOUT EECS EESK EEDATA TEST 0 AVCC A VCC 9 VCC 6 VCCIO C6 0.µF TXD RXD RTS CTS DTR DSR 0 DCD 9 RI 8 TXDEN 6 TXLED# RXLED# PWRCTL PWREN# SLEEP# 0 TXD RXD RTS CTS DTR DSR DCD RI +V +.V +.V OUT SHDN U6 MAX8 N.C. C 0µF MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B RXD DTR Figure b. MAX8A EV Kit Schematic (Sheet of ) Maxim Integrated Products

14 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure 8. MAX8A EV Kit Component Placement Guide Component Side Maxim Integrated Products

15 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure 9. MAX8A EV Kit PCB Layout Component Side Maxim Integrated Products

16 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Figure 0. MAX8A EV Kit PCB Layout Solder Side Maxim Integrated Products 6

17 MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B Ordering Information PART MAX8AEVKIT# #Denotes RoHS compliant. TYPE EV Kit Maxim Integrated Products

18 REVISION NUMBER REVISION DATE MAX8A Evaluation Kit Evaluates: MAX8/MAX8/ MAX8A/MAX8B DESCRIPTION Revision History PAGES CHANGED 0 / Initial release Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 60 Rio Robles Drive, San Jose, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.