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MSP430FR5043: I2C communication with BQ25700A IC not returning ACK

Bivin George
Expert 1057 points
Part Number: MSP430FR5043
Other Parts Discussed in Thread: BQ25700A,

Hi

I'm trying to interface MSP430FR5043 with BQ25700A , but while testing , it was found that BQ25700A try to ACK but line is not getting pulled low. Refer waveform below.

The pull-up resistor used is 10K as recommended in BQ25700A datasheet.

I tried decreasing SCL frequency but this didn't worked.

1. Can i increase pull-up resistor value, upto what value can i increase the same ?

2. Is there a way to neglect the ACK bit in I2C communication, i'm using I2C API of MSP430.

3. In GPIO API library, i found initializing GPIO with pull-up & pull-down resistor . Will this solve the issue ?

Suggest a solution for the above.

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