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Forum Post: RE: Reading/Writing to AFE4405 on EVM from External Microcontroller (STM32)

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Hi Steven, Your procedure is correct. In addition to that, please make sure following pins of the AFE at proper levels. RESETZ = High CONTROL1 = Low I2C_SPI_SEL = LOw Also you MCU's GPIO pin should have voltage level of 3V ( same as IO_SUP of AFE). Regards, Prabin

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