PCF2131 is sending Acknowledgment

[PK_1114]

Hai,

I am Working with the PCF2131is interfaced with the LPC54608 FC-7,

while Configuring the RTC it is going to slave not ACK state in I2C Bus Communication

Thank You,

B Pavan Kumar

[TomasVaverka · Accepted solution]

Hi,

First of all, please double check that the IFS pin is connected to VDD:

 

Then please make sure that the 7-bit slave address (1010011) is placed in the upper 7 bits of the byte and the write/read bit is in the LSB. This means 0xA6 for a write and 0xA7 for a read. Best is to check it using a logic analyzer or an oscilloscope.

Best regards,

Tomas