Getting started with the STEVAL-IME011V2 evaluation board based on the STHV748S ultrasound pulser

Transcription

1 UM2163 User manual Getting started with the STEVAL-IME011V2 evaluation board based on the STHV748S ultrasound pulser Introduction The STEVAL-IME011V2 evaluation board is designed around the STHV748S 4-channel 5-level high voltage pulser, a state-of-the-art device designed for ultrasound imaging applications. This board facilitates evaluation of the ultrasound pulser IC thanks also a new graphical user interface. Once configured, the output waveforms can be displayed directly on an oscilloscope by connecting the probe to the relative BNCs. Figure 1: STEVAL-IME011V2 evaluation board January 2017 DocID Rev 1 1/30

2 Contents UM2163 Contents 1 Board features Getting started Hardware layout and configuration Power supply MCU Stored patterns STHV748S stage Operating supply conditions Connectors Power supply MCU Schematic diagrams PCB layout Revision history /30 DocID Rev 1

3 UM2163 List of tables List of tables Table 1: Program Table 2: Program Table 3: Program Table 4: Program Table 5: DC working supply conditions Table 6: USB mini B connector pinout Table 7: JTAG connector pinout Table 8: Boot connector pinout Table 9: Document revision history DocID Rev 1 3/30

4 List of figures List of figures UM2163 Figure 1: STEVAL-IME011V2 evaluation board... 1 Figure 2: Connection between STM32F4 and STHV748S... 7 Figure 3: STEVAL-IME011V2 board layout... 7 Figure 4: STEVAL-IME011V2 connections... 8 Figure 5: Solution 1 with STM32 direct memory access (DMA) peripheral... 9 Figure 6: Solution 2 with direct MCU core intervention Figure 7: Program 1 scheme Figure 8: Acquisition by Program Figure 9: Program 2 scheme Figure 10: Acquisition by Program Figure 11: Program 3 scheme Figure 12: Acquisition by Program Figure 13: Program Figure 14: Acquisition by Program Figure 15: STHV748S single channel block diagram Figure 16: Power supply connector VDD (+5V - GND) Figure 17: Power supply connector VSS (GND - -5V) Figure 18: Power supply connector HVP0 HVP1 and HVM0 HVM Figure 19: USB mini-b connector (CN1) Figure 20: JTAG connector Figure 21: Boot connector Figure 22: STEVAL-IME011V2 circuit schematic Figure 23: Top layer Figure 24: Inner layer Figure 25: Inner layer Figure 26: Inner layer Figure 27: Inner layer Figure 28: Bottom layer /30 DocID Rev 1

5 UM2163 Board features 1 Board features 4-channel outputs: high voltage and low voltage BNC connectors Up to 4 memory locations to store own waveforms designs USB connector to load own waveforms onto the board Dedicated connectors to supply high voltage and low voltage to the STHV748S output stage 4-key button rapid preferred program selection RoHS compliant DocID Rev 1 5/30

6 Getting started UM Getting started The STEVAL-IME011V2 is shipped by STMicroelectronics ready to use. The user only needs to: Plug the power supply to the board Connect the BNCs to the oscilloscope (see Section 3.1: "Power supply" for details) Check LED PROGRAM 1 (LD1) turns on Select the waveform with the PROGRAM button The corresponding PROGRAM LED (LD1-LD4) turns on Press the START button to run the selected program The START LED (L5) turns on. When the program ends, L5 LED turns off If a continuous wave program is selected, the STOP button must be pressed to stop program execution and the STOP LED (L5) turns off To run the same program again, restart from step 5. To run another program, restart from step 4 An overvoltage protection mechanism suspends pattern generation if the HV supply exceeds 90 V and the red LED (L6) switches on. Pattern generation restarts as soon as the HV supply voltage falls back into the allowed range. 6/30 DocID Rev 1

7 UM2163 Hardware layout and configuration 3 Hardware layout and configuration The STEVAL-IME011V2 evaluation board is designed around the STHV748S. Figure 2: Connection between STM32F4 and STHV748S Figure 3: STEVAL-IME011V2 board layout 3.1 Power supply The STEVAL-IME011V2 low voltage block is designed to be powered: during programming and when the board is connected to a PC: 5 V DC through a USB Mini B connector to supply the STM32F4 during pattern generation and when high voltage is powered on: 5 V DC connected to VDD to supply STM32F4 and STHV748S through an LDO -5 V DC connected to VSS to supply STHV748S through an LDO DocID Rev 1 7/30

8 Hardware layout and configuration The USB connector must be removed when high voltage is powered on. UM2163 The STEVAL-IME011V2 high voltage block is designed to be powered: VDD: positive supply voltage, 5 V (2 - VDD conn.) GND: ground (1 VDD conn. And 2 VSS conn.) VSS: negative supply voltage 5 V (1 - VSS conn.) GND: ground (1 HVP0 conn.) HVP0: TX0 high voltage positive supply (2 - HVP0 conn.) GND: ground (1 HVP1 conn.) HVP1: TX1 high voltage positive supply (2 - HVP1 conn.) HVM1: TX1 high voltage negative supply (1 - HVM1 conn.) GND: ground (2 - HVM1 conn.) HVM0: TX0 high voltage negative supply (1 - HVM0 conn.) GND: ground (2 HVM0 conn.) Figure 4: STEVAL-IME011V2 connections 3.2 MCU The STM32F427 is fully dedicated to generate the bitstream on its GPIO pins to drive the pulser output channels. It is already pre-programmed as a DFU (device firmware upgrade) with the ability of upgrading internal Flash memory. The STM32F427 manages all the DFU operations, such as the authentication of product identifier, vendor identifier and firmware version. The MCU drives the pulser channels through the use of different GPIO pins. You can simultaneously drive from 1 to 16 different pins by simply writing a 16-bit word into the GPIO output data register (ODR). The board can be connected to a PC via USB. The required pattern is sent as a sequence of states for each pulser channel and for each state duration (expressed in units of MCU system clock cycle). 8/30 DocID Rev 1

9 UM2163 Hardware layout and configuration Once the information is received, the channel states are converted into 16-bit words for the GPIO peripheral and they are stored in the embedded Flash, with the timing information. After programming, the PC is no longer required, so the board becomes a stand-alone device. Different patterns can be stored and you can select the one to use at run-time. The same MCU can implement two different solutions for real-time execution. The first solution involves the use of the STM32 direct memory access (DMA) peripheral, which can transfer data from memory to any peripheral register, GPIO included, without the intervention of the MCU core. To trigger DMA transfer, a general purpose timer is used, that works at the system clock frequency and basically acts as a counter: the reload value (the value at which the counter returns to zero) is stored in the auto reload register (ARR). The timer triggers two different DMA channels in two different moments: the first channel is triggered at each reload event and transfers the new GPIO word to the ODR; the second is triggered at a constant time after reload and transfers the new duration information to the ARR The timer preload feature is enabled, so that the new ARR value is effective only at the next reload. Since the time needed by the first DMA channel to update the ODR is a constant, considering the reload trigger as a starting point, the time between two different GPIO updates is simply given by the ARR value. The DMA circular buffer feature can be enabled to allow automatic regeneration of the same pattern at each end. This solution has the advantage of being fully managed by hardware, thus, the MCU core is completely free for any user requirement. The main drawback is that each timing value between two subsequent states cannot be lower than a minimum value to guarantee enough time for both DMA channels to perform their transfers. Figure 5: Solution 1 with STM32 direct memory access (DMA) peripheral The second solution is designed to overcome the DMA minimum duration requirement and directly involves the MCU core: during run-time, the core generates the binary assembly code it needs to load and store each word in the ODR. Any unnecessary instructions like control loops are avoided; the code is only a succession of simple load/store instructions; DocID Rev 1 9/30

10 Hardware layout and configuration UM2163 to adapt the timing to the pattern needs, dummy instructions are inserted in the assembly code. To avoid wasting time to load each word from memory, the word is inserted as a literal in the assembly instruction itself, which means that a 32-bit instruction is needed instead of an equivalent 16-bit; to avoid any latency due to the instruction fetch from Flash, the code is executed from the embedded RAM. Moreover, the RAM is configured to be accessed by the core through a different bus to the one used to access the ODR. Thanks to this solution, it is possible to achieve a minimum time of two system clock cycles before two updates and maintain one system clock cycle resolution. For instance, if you consider a STM32F4 clocked at 168 MHz, the minimum timing you can achieve is 12 ns and you can set the duration of each state with a resolution of 6 ns. For a repetitive pattern, a branch instruction is added at the end of the routine to restart the pattern generation. In this case, the clock cycles needed for the branch instruction has to be considered for the last state. The main drawback of this solution is that the MCU core is 100% involved in the pattern generation even though it can still be called by peripheral interrupts and stop pattern generation to perform other tasks. Figure 6: Solution 2 with direct MCU core intervention 3.3 Stored patterns The STEVAL-IME011V2 can store four different patterns in the MCU Flash memory to demonstrate the achievable performance at the pulser outputs. Four selectable programs already stored in STM32 Flash memory form the default set which is available and ready to use (flagged by L1 to L4 LEDs). Program 1: XDCR_A: pulse wave mode, TX0 switching, 5 pulses, time-period TP = 400 ns and PRF = 150 µs XDCR_B: pulse wave mode, TX0 switching, 5 pulses in counter phase respect to XDCR_A, time-period TP = 400 ns and PRF = 150 µs XDCR_C: pulse wave mode, TX1 switching, 5 pulses, time-period TP = 200 ns and PRF = 150 µs XDCR_D: pulse wave mode, TX1 switching, 5 pulses in counter phase with respect to XDCR_C, time-period TP = 200 ns and PRF = 150 µs 10/30 DocID Rev 1

11 UM2163 Hardware layout and configuration TX0 indicates that the H-bridge is supplied by HVP/M0, while TX1 indicates that the H-bridge is supplied by HVP/M1. Figure 7: Program 1 scheme DocID Rev 1 11/30

12 Hardware layout and configuration UM2163 Table 1: Program 1 PW 5 pulses - HV0/1 = ± 60 V; LOAD: 270 pf//100 Ω Mode Frequency (MHz) Number of pulses Initial pulse H-bridge PRF Ch A PW positive TX0 150 µs Ch B PW negative TX0 150 µs Ch C PW 5 5 positive TX1 150 µs Ch D PW 5 5 negative TX1 150 µs Figure 8: Acquisition by Program 1 Program 2: XDCR_A: pulse wave mode, TX0 switching, 5 pulses, time-period TP = 200 ns and PRF = 150 µs XDCR_B: pulse wave mode, TX0 switching, 5 pulses in counter phase with respect to XDCR_A, time-period TP = 200 ns and PRF =150 µs XDCR_C: pulse wave mode, TX1 switching, 5 pulses, time-period TP = 100 ns and PRF = 150 µs XDCR_D: pulse wave mode, TX1 switching, 5 pulses in counter phase with respect to XDCR_C, time-period TP = 100 ns and PRF = 150 µs 12/30 DocID Rev 1

13 UM2163 Figure 9: Program 2 scheme Hardware layout and configuration Table 2: Program 2 PW TX0 & TX1 5 pulses - HV0/1 = ± 60 V; LOAD: 270 pf//100 Ω Mode Frequency (MHz) Number of pulses Initial pulse H-bridge PRF Ch A PW 5 5 positive TX0 & TX1 150 µs Ch B PW 5 5 negative TX0 & TX1 150 µs Ch C PW 10 5 positive TX0 & TX1 150 µs Ch D PW 10 5 negative TX0 & TX1 150 µs DocID Rev 1 13/30

14 Hardware layout and configuration UM2163 Figure 10: Acquisition by Program 2 Program 3: XDCR_A: continuous wave mode, TX-CW switching, time-period TP = 400 ns XDCR_B: continuous wave mode, TX-CW switching in counter-phase respect to XDCR_A, time-period TP = 400 ns XDCR_C: continuous wave mode, TX-CW switching, time-period TP =200 ns XDCR_D: continuous wave mode, TX-CW switching in counter-phase with respect to XDCR_C, time-period TP = 200 ns 14/30 DocID Rev 1

15 UM2163 Figure 11: Program 3 scheme Hardware layout and configuration Table 3: Program 3 Continuous wave - HV1=±10V; LOAD: 270 pf//100 Ω Mode Frequency (MHz) Number of pulses Initial pulse H-bridge Ch A CW 2.5 continuous wave positive TX-CW Ch B CW 2.5 continuous wave negative TX-CW Ch C CW 5 continuous wave positive TX-CW Ch D CW 5 continuous wave negative TX-CW DocID Rev 1 15/30

16 Hardware layout and configuration UM2163 Figure 12: Acquisition by Program 3 Program 4: XDCR_A: pulse wave mode, TX0 switching, 1.5 pulses, time-period TP =400 ns and consequently TX1 switching, 5 pulses, time period TP = 200 ns and PRF = 150 µs XDCR_B: pulse wave mode, TX0 switching, 1.5 pulses, time-period TP = 400 ns and consequently TX1 switching, 5 pulses, time-period TP = 200 ns and PRF = 150 µs XDCR_C: pulse wave mode, TX0 switching, 1.5 pulses, time-period TP = 200 ns and consequently TX1 switching, 5 pulses, time-period TP =200 ns and PRF=150 µs XDCR_D: pulse wave mode, TX0 switching, 1.5 pulses, time-period TP = 200 ns and consequently TX1 switching, 5 pulses, time-period TP = 200 ns and PRF = 150 µs 16/30 DocID Rev 1

17 UM2163 Figure 13: Program 4 Hardware layout and configuration DocID Rev 1 17/30

18 Hardware layout and configuration Mode Table 4: Program 4 Pulse cancellation - HV0/1 = ±60 V; LOAD: 270 pf//100 Ω Frequency (MHz) Ch A PW Ch B PW Ch C Ch D PW 5 PW 5 Number of pulses 3 half pulse then 4 pulse 3 half pulse then 4 pulse 3 half pulse then 4 pulse 3 half pulse then 4 pulse Initial pulse positive negative positive negative H-bridge TX0 then TX1 TX0 then TX1 TX0 then TX1 TX0 then TX1 UM2163 PRF 150 µs 150 µs 150 µs 150 µs Figure 14: Acquisition by Program 4 The board can be connected to a PC via a USB cable and patterns can be edited through a user interface. The USB cable must be removed when a high voltage is connected to the board. 3.4 STHV748S stage The STHV748S high-voltage, high-speed ultrasound pulser features four independent channels. It is designed for medical ultrasound applications, but can also be used for other piezoelectric, capacitive or MEMS transducers. The device contains: a controller logic interface circuit level translators MOSFET gate drivers 18/30 DocID Rev 1

19 UM2163 Hardware layout and configuration noise blocking diodes high-power P-channel and N-channel MOSFETs as output stages for each channel clamping-to-ground circuitry anti-leakage anti-memory effect block a thermal sensor an HV receiver switch (HVR_SW), which guarantees strong decoupling during the transmission phase self-biasing and thermal shutdown blocks (see Figure 15: "STHV748S single channel block diagram") Each channel can support up to five active output levels with two half bridges. Each channel output stage is able to provide a ±2 A peak output current; to reduce power dissipation during continuous wave mode, the peak current is limited to 0.6 A (a dedicated half bridge is used). For further information, please refer to the STHV748S datasheet. Figure 15: STHV748S single channel block diagram STHV748S output waveforms can be directly displayed for each channel Ch A/B/C/D using an oscilloscope by connecting the scope probe to the XDCRA, XDCRB, XDCRC and XDCRD SMB connectors. Moreover, pulser outputs are connected to the onboard equivalent load, a 270 pf 200 V capacitor paralleled with a 100 Ω, 2 W resistor. A coaxial cable can also be used to easily connect the user transducer; in this case, the equivalent load should be removed from the board. Furthermore, four low voltage outputs are available to receive the echo signal coming from the piezo-element through HVR_SW (LVOUTA, LVOUTB, LVOUTC, LVOUTD). DocID Rev 1 19/30

20 Hardware layout and configuration UM2163 The main issues in this PCB design are the capacitance values necessary to ensure good filtering and the effective decoupling between the low voltage inputs (IN1, IN2, IN3, IN4 and EN for each channel) and the HV switching signals (XDCR, HVOUT, etc.), which is ensured by the implemented layer separation. 3.5 Operating supply conditions Table 5: DC working supply conditions Operating supply voltages Symbol Parameter Min. Typ. Max. Value VDD Positive supply voltage V VSS Negative supply voltage V HVP0 TX0 high voltage positive supply 95 V HVP1 TX1 high voltage positive supply 95 V HVM0 TX0 high voltage negative supply -95 V HVM1 TX1 high voltage negative supply -95 V The high voltage pins must be HVP0 HVP1 and HVM1 HVM0 20/30 DocID Rev 1

21 UM2163 Connectors 4 Connectors 4.1 Power supply The STEVAL-IME011V2 evaluation board is powered through the screw connectors shown in the following figures. Figure 16: Power supply connector VDD (+5V - GND) Figure 17: Power supply connector VSS (GND - -5V) DocID Rev 1 21/30

22 Connectors Figure 18: Power supply connector HVP0 HVP1 and HVM0 HVM1 UM MCU Figure 19: USB mini-b connector (CN1) 22/30 DocID Rev 1

23 UM2163 Table 6: USB mini B connector pinout Pin number Description 1 Vbus (power) 2 DM (STM32 PA11) 3 DP (STM32 PA12) 4 N.C. 5 Ground Connectors Figure 20: JTAG connector Table 7: JTAG connector pinout Pin number Description 1 DVDD 2 JTDI 3 JTMS 4 JTCK 5 JTDO 6 JRST 7 GND 8 NRST Figure 21: Boot connector DocID Rev 1 23/30

24 Connectors Table 8: Boot connector pinout Pin number Description 1 GND 2 BOOT0 (boot from flash memory) 3 DVDD (DFU mode) UM /30 DocID Rev 1

25 UM2163 Schematic diagrams DocID Rev 1 25/30 5 Schematic diagrams Figure 22: STEVAL-IME011V2 circuit schematic U1 PE2 1 PE3 2 PE4 3 PE5 4 PE6 5 VBAT 6 PC13 7 PC14 8 PC15 9 VSS5 10 VDD5 11 OSC_IN 12 OSC_OUT 13 NRST 14 PC0 15 PC1 16 PC2 17 PC3 18 VSSA 19 VREF- 20 VREF+ 21 VDDA 22 PA0 23 PA1 24 PA2 25 PA3 26 VSS4 27 VDD4 28 PA4 29 PA5 30 PA6 31 PA7 32 PC4 33 PC5 34 PB0 35 PB1 36 PB2 37 PE7 38 PE8 39 PE9 40 PE10 41 PE11 42 PE12 43 PE13 44 PE14 45 PE15 46 PB10 47 PB11 48 VSS1 49 VDD1 50 PB12 51 PB13 52 PB14 53 PB15 54 PD8 55 PD9 56 PD10 57 PD11 58 PD12 59 PD13 60 PD14 61 PD15 62 PC6 63 PC7 64 PC8 65 PC9 66 PA8 67 PA9 68 PA10 69 PA11 70 PA12 71 PA13 72 NC 73 VSS2 74 VDD2 75 PA14 76 PA15 77 PC10 78 PC11 79 PC12 80 PD0 81 PD1 82 PD2 83 PD3 84 PD4 85 PD5 86 PD6 87 PD7 88 PB3 89 PB4 90 PB5 91 PB6 92 PB7 93 BOOT 94 PB8 95 PB9 96 PE0 97 PE1 98 VSS3 99 VDD3 100 U2 STHV748 AGND1 1 REF1_HVM1 2 HVM1_A 3 HVM0_A 4,65 HVOUT_A 5 HVP0_A 6 REF1_HVP1 7 HVP1_A 8 HVP1_B 9 REF1_HVP0 10 HVP0_B 11 HVOUT_B 12 HVM0_B 13 HVM1_B 14 REF1_HVM0 15 D_CTR 16 IN4 17 IN1_B 18 IN2_B 19 IN3_B 20 VDDP1 21 GND_PWR_B 22 XDCR_B 23 LVOUT_B 24 LVOUT_C 25 XDCR_C 26 GND_PWR_C 27 VDDM1 28 IN3_C 29 IN2_C 30 IN1_C 31 THSD 32 AGND2 33 REF2_HVM1 34 HVM1_C 35 HVM0_C 36 HVOUT_C 37 HVP0_C 38 REF2_HVP1 39 HVP1_C 40 HVP1_D 41 REF2_HVP0 42 HVP0_D 43 HVOUT_D 44 HVM0_D 45 HVM1_D 46 REF2_HVM0 47 DGND 48 DVDD 49 IN1_D 50 IN2_D 51 IN3_D 52 VDDP2 53 GND_PWR_D 54 XDCR_D 55 LVOUT_D 56 LVOUT_A 57 XDCR_A 58 GND_PWR_A 59 VDDM2 60 IN3_A 61 IN2_A 62 IN1_A 63 INT_BIAS 64 RF1 107k RF2 62k RF4 107k RF3 62k REG2 LT3032 OUTP 1 ADJP 2 BYPP 3 GND 4,5 INN 6,9 OUTN 7 ADJN 8 BYPN 11 SHD 10,12 INP 14 X1 8MHz Cosc2 22pF Rosc 1M OSC_IN OSC_OUT OSC_IN OSC_OUT REG1 LD1117 GND IN OUT CF2 10F CB1 +5V DVDD DVDD SHD AVDD AVSS CC1 10nF CC2 10nF Cosc1 22pF CR5 3.9nF CR1 22nF CR6 3.9nF CR7 3.9nF CR8 3.9nF CR2 22nF CR3 22nF CR4 22nF CB25 CB27 CB26 CB21 CB23 CB24 CB22 HVM1 CB28 CF10 10F CF9 10F SHD XDCRA XDCRB XDCRC XDCRD HVP1 HV+ HV- HVM1 HV+ HV- SPI_CLK SPI_CLK SPI1_MISO SPI2_MISO SPI_CLK SPI3_MISO SPI_CLK USBDP USBDM JTMS JTCK JTDI SPI_JTAG_1 SPI_JTAG_2 JTDO JRST STR PRG STP USR CP1 CP2 CP3 CP4 P1 P2 P3 P4 RP1 10k RP2 10k RP3 10k RP4 10k P1 P2 P3 P4 DVDD L1 L2 L3 L4 RL1 56 RL2 56 RL3 56 RL4 56 L1 L2 L3 L4 L1 L2 L3 L4 ADC_IN0 ADC_IN1 ADC_IN2 VDD LV+ LV- VSS LV+ LV- -5V CF3 10F CF4 10F -5V CF6 10F CF5 10F CF1 10F +5V GND_PWR GND_PWR HVP1 RLA 100 RLB 100 RLC 100 RLD 100 CLA 270pF CLB 270pF CLC 270pF CLD 270pF GND_PWR USB VBUS 1 D+ 3 D- 2 GND 5 Shell ID 4 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC15 PC14 PC13 PC10 PC11 PC12 PC0 PC1 PC2 PC5 PC4 PC3 PC10 PC11 PC12 PC6 UF1 USBUF01W6 D1 1 GND 2 D2 3 D3 4 VDD 5 D4 6 DVDD USBDP USBDM D2 BAT20J +5V D1 BAT20J CB2 CB3 CB4 CB5 CB6 DVDD SPI2_MISO SPI3_MISO SPI1_MISO SPI1 SPI2 SPI3 PC11 PC10 PC12 CB7 CB8 CB9 CB10 AVDD AVSS CB11 CB12 RST CRST NRST NRST JTMS JTCK JTDI JTDO JRST USB_PWR R RSHD 330 RAD3 100k RAD4 2.7k ADC_IN2 RAD1 2.7k RAD2 100k ADC_IN0 HVP1 HVM1 AVDD JTAG DVDD POT1 50 % ADC_IN1 L5 RL5 56 L6 RL6 56 L5 L6 L5 L6 RE0 56 RE1 56 RE2 56 RE3 56 RE4 56 RE5 56 RE6 56 RE7 56 THSD THSD RTHSD 10k HVP1 HVP0 HVP1 HVP0 HVM1 HVM0 HVM1 HVM0 CB17 CB19 CB18 CB13 CB15 CB16 CB14 HVM0 CB20 CF8 10F CF7 10F HVP0 HV+ HV- HVM0 HV+ HV- GND_PWR HVP0 ZAD2 DZ2S033 CAD2 CAD1 RHVP 0 HVP0 HVP1 RHVM 0 HVM0 HVM1 RGND 0 GND_PWR BOOT0 ZAD1 DZ2S033 NRST DVDD C2_F2_F4 2.2F C1_F2_F4 2.2F R3_F1 0 R2_F1 0 R1_F1_F4 0 R2_F2_F4 0 R1_F2 0 DVDD AUX1 AUX2 AUX3 AUX0 AUX4 AUX5 AUX6 AUX7 AUX1 AUX2 AUX3 AUX0 AUX4 AUX5 AUX6 AUX7 PC13 PC PC14 PC15 LVOUTA LVOUTB LVOUTC LVOUTD RRA 100 RRB 100 RRC 100 RRD 100 CRA 270pF CRB 270pF CRC 270pF CRD 270pF USR_RX AN_SUPPLY AVDD AVSS STM32F427 GSPG SG

26 PCB layout UM PCB layout Figure 23: Top layer Figure 24: Inner layer 1 26/30 DocID Rev 1

27 UM2163 Figure 25: Inner layer 2 PCB layout Figure 26: Inner layer 3 DocID Rev 1 27/30

28 PCB layout Figure 27: Inner layer 4 UM2163 Figure 28: Bottom layer 28/30 DocID Rev 1

29 UM2163 Revision history 7 Revision history Table 9: Document revision history Date Version Changes 17-Jan Initial release. DocID Rev 1 29/30

30 UM2163 IMPORTANT NOTICE PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document STMicroelectronics All rights reserved 30/30 DocID Rev 1