Other Parts Discussed in Thread: BQ27427, LP5813,
Hi,
We have a custom PCB which follows a similar schematic in the EVM board mentioned in this: https://www.ti.com/lit/ug/sluucq9/sluucq9.pdf?ts=1705993731348
Current status of the battery charger:
- The charger IC functions partially
- It is capable of charging our Li Ion battery with default configs
- Switching between battery and USB charger works properly
- The device responds with an acknowledgement when requested via I2C but the IC responds 0x00 for all requested registers. This was observed using a logic analyzer and the sample waveform is below. I2C bus is working at 100Kbps
- The I2C waveforms were observed via an Oscilloscope to see for its signal integrity, the state switches are fine. Please check the image below.
SCL
SDA
- There are other I2C slaves connected to the same rail, following are a list of them with their status
- BQ25629 - No communication
- BQ27427 - No communication
- LP5813 - Functions properly
- We send communication commands 2 seconds after booting up
- We have a BQ25629EVM module with us for comparison and it communicates properly.
Questions & Requests
- Any idea why the IC does not respond properly?
- Is it possible for you to provide us a sample firmware?
Thank you and will be waiting for a response.
Sincerely,
Chamith Koperahewa
