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ADS1231: DOUT outputs 1 Volt

Part Number: ADS1231

Hello There!, I'm using the ADS1231 with the reference schematic. I have tried to read data, but nothing happens. I have checked the DOUT signal when I set PDWN to high and SCLK to low, and it makes 100ms period pulses. The thing is that these pulses are 1 V amplitude, and when STM32 tries to detect the high value of DOUT it detects as low, because of the low voltage (1V). Is this amplitude normal, or it must be higher in order to be detected by the microcontroller?

Thank you very much,

Pablo