Other Parts Discussed in Thread: BQSTUDIO, GPCCHEM
Dear TI-forum users,
While studying the BQ35100 for a while there are serval things that remain unclear. The device has problems reading a current of +/-8mA, reading the Current() register always gives the value 0mA.
Strangely enough the voltage measurement ( Voltage() ) is accurate. From my understanding there is a need to use a op-amp to amplify the current, before the device is able to read the current of 8mA.
Using the coulomb counter (ACC mode) for a current draw below the 10mA is probably useless. Changing the recommended shunt of 0.1 Ohm to a higher resistance of 5 Ohm doesn't change the voltage accuracy, also the current remains 0mA.
Also there is no manual available that defines how to change the CHEM_ID of the BQ35100. Nor what hardware is needed to change the CHEM_ID of production ICs.
I'm wondering how to setup a single BQ35100 IC to flash the right CHEM_ID (607) from BQSTUDIO to the BQ35100.
In short:
- How does the device accurately measures the voltage (while the current measurement always remains 0mA)?
- What is the range of the current measurement?
- If there is a need for an op-amp, which op-amp is commonly used in combination with the BQ35100?
- What hardware do you need to change the CHEM_ID? (preferably just the IC and some sort of flashing device because of mass productions)
- How to change the CHEM_ID?
- What is a golden image, how to create one and use it?
Answering these questions will help me a lot and probably lead to a first production.
The current draw of 0.05uA when GE is disabled is unique and perfect for my situation. So hopefully there is a easy way to fix the current measurement
or change the CHEM_ID to 607 so one of these functions work properly.
Hopefully someone could help me out.
Thank you for your time!
Sincerely,
Jorg