BQ25713: I2C - debug lack of answer?

Brad S

Part Number: BQ25713
Other Parts Discussed in Thread: EV2400

Hi,
Any ideas whats going wrong here trying to get I2C communication working with the charger IC? suggestions?

Using the EVM board, but not the usb-i2c connector or your software (do not have them). so our microcontroller and our code. the trace is taken at the EVM jumper for SDA and SCL. EVM has power.

On the right of the below trace i expect manuf ID 0x40, not 0xFF (its reading 2 bytes for no good reason). Same result for ChargeOption0

To go through the test from left to right

The board address is 6B ->D6,D7. register 0x14 does not exist to test for NACK . register 0x2E should return manufacture id 0x40.

thanks in advance

over 4 years ago

0 Tiger Zhou over 4 years ago

TI__Mastermind 19195 points

Hi, Brad,

Could you capture another waveform using TI connector and TI software? so we can compare both waveforms and find the differences.

0 Brad S over 4 years ago in reply to Tiger Zhou

Intellectual 300 points

As written in the original post I do not have them (i.e. no EV2400). By the time I realised the EVM had been ordered without it, we didnt want to wait for Covid time frame ordering so wrote the I2C code

(TI could replicate reasonably easily with the 2 registers shown in the main post)