Starterware/BQ27541: BQ27541 1-wire communication (HDQ)

Moving this thread to the Battery Management forum.

Yes, HDQ is possible. You'll have to configure each bq27541 to use HDQ mode with bqStudio (HDQ button).

Dear Dominik,

Thank you for your attention and support.

I have additional questions.
1. Does the SDA & SCL Pin need to be connected when designing the circuit? (When only 1-wire communication is used.)
2. Are there any products that only work with HDQ?

Thank you for your help.

1. Please pull unused communication pins to VBAT with a 1M resistor.
2. The gauges that support HDQ also support I2C.

Dear Dominik,

Thank you for your attention and support.

Initially I know that it is offered in I2C mode.
Is it possible to use the EV2300 and bqEVSW in the design as above,
So that it is automatically recognized without conversion to HDQ?
The desktops in our factory are not bqStudio compatible.
So, we are using EV2300 program in production.
Can you let me know?(Enter HDQ Mode – Command Sequence)

Thank you for your help.

I'll try to get the sequence and will update the thread.

1. Write .df.fs file.
2. Unseal the gauge.

3. go to ROM mode:

W: AA 00 00 0F
X: 1000

4. enable HDQ:
W: 16 00 16
W: 16 04 05
W: 16 64 1B 00

5. exit ROM mode:
W: 16 00 0F
W: 16 64 0F 00
X: 4000

Note that this is irreversible. Once it is in HDQ mode, there is no going back to I2C mode.