Hello ST,
We are working with the ST25RU3993 and have purchased the ST25RU3993-HPEV board to evaluate the RFID chip.
Now, we want to drive the ST25RU3993 via SPI with a different MCU. We have read previous posts explaining how to disable the STM32 MCU without removing it but those recommandations apply to the EVAL board:
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1. Remove R7, R8, R9, R11 (NCS, CLK, MISO, MOSI) and R12, R13 (IRQ, EN) and connect on the pin-header your SPI and GPIOs
2. Remove R61 on the board short circuit C25. This reduce power consumption by putting the STM32L4 into shutdown
3. Remove R38, R39 and R40. This will allow you to use the carrier cancellation from your MCU. Use the ETC_3, ETC_2 and ETC_1 pins on the board
4. The ST25RU3993 EVAL board has a RF switch to switch between the internal and a external PA. To drive this from your MCU you need to controll PA_SW_V1 and PA_SW_V2 lines.
The easiest way to do this is to solder wires to the STM32L4 MCU pin 25 (PA_SW_V1) and pin26 (PA_SW_V2) and controll the switch from your MCU
Finally you need to supply the board via P2 and connect GND. You need approx 800mA @ 5V.
"
Do the steps described also apply to the HPEV board? Are there additional modifications to be done?
Thank you in advance.
Stéphanie
