BQ25703A: I2C communication (STM32)

Juan Ortiz79

Part Number: BQ25703A
Other Parts Discussed in Thread: BQ25703, BQSTUDIO, , EV2400

Hi,

I have tried to check the I2C port with an Arduino Due with the I2C Scanner sketch. However, it does not detect anything.

I have also tried to communicate with my BQ25703 design through a STM32F411 microcontroller. SDA and SCL pins are in pull-up with a 10k resistor at 3.3V.

I have tried to read with HAL_I2C_Mem_Read function without success. How can I do it?

over 6 years ago

0 Wang5577 over 6 years ago

TI__Guru 56650 points

First, can you use EV2400, bqstudio and follow the EVM user's guide to communicate with bq25703A? That can make sure the hardware setup is right.
After the communication is built up, use a scope to record the SDA and SCL signal. And then, you can compare the abnormal signal with reference signal to find out the root cause.

0 Juan Ortiz79 over 6 years ago in reply to Wang5577

Prodigy 140 points

I have no EV2400. That's the problem.

0 Juan Ortiz79 over 6 years ago in reply to Juan Ortiz79

Prodigy 140 points

The I2C address of this charger is 0xD6.

But that is a 8bit address. So, the real address is 6B?

0 Wang5577 over 6 years ago in reply to Juan Ortiz79

TI__Guru 56650 points

Yes. You can call the address as "6B".

0 Wang5577 over 6 years ago in reply to Wang5577

TI__Guru 56650 points

Please order EV2400 and check the communication with bqstudio to verify the SDA, SCL signal and hardware connection.
Or, please use scope to measure SDA and SCL signal on charger side and share it to here. And then, we can know what command do you send out and where does the issue come out?

0 Wang5577 over 6 years ago in reply to Wang5577

TI__Guru 56650 points

Since there is no new post for this thread over a week, I am going to close it.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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BQ25703A: I2C communication (STM32)