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BQ25792: new design

Part Number: BQ25792
Other Parts Discussed in Thread: , BQSTUDIO

I'm doing a new  BQ25792 design which includes PV input and 1/2 cell LFP batteries.

1. This is a high volume, remote embedded application, so I'm implementing an I2C interface as part of the charge controller design. Can I use battery management studio without an EV2300? I want to start evaluating your device with a generic I2C interface board, which I have.

2. If not, can I use battery management studio to generate configuration tables for my code to implement? If not, what other tool will generate configuration tables for my application?

3. Any other guidance on how to approach the device configuration would be helpful. I have a BQ25792EVM in hand and would rather not do all the configuration completely from scratch.

4. Is there any way to talk to an applications engineer directly?

  • HI Lloyd,

    Regarding 1, I don't think that will work as the BQSTUDIO software was written exclusively for the EV2300/400.  The BQSTUDIO software only performs generic I2C reads and writes.  It doesn't help you pick which registers.  You don't really need it if your I2C interface board can do the reads and writes.

    Regarding 2 and 3, there is a linux driver at https://git.ti.com/gitweb?p=ti-analog-linux-kernel/dmurphy-analog.git;a=commit;h=75997c21e9dfc0d54b7f774bfb37e6af796ff293.  The charger charges the battery in default mode with default input current limit (clamped by ILIM_HIZ pin resistors if EN_ILIM bit=1), charge current, battery regulation voltage, precharge and termination current and minimum system voltage.  The only other register that you might need to change is VINDPM which is the redundant input side protection with input current limit that prevents the charger from collapsing its power source.

    Regarding 4, unfortunately, direct apps support is reserved for high volume customers. e2e is the best tool for getting questions answered. 

    Regards,

    Jeff

  • Thanks Jeff. That's a good start. Your detailed answers on the implicit question of "do I really have to configure all ~60 registers" is quite helpful. I'll just use my embedded MCU to configure and read status as necessary.

    If we use this part, I guess we'll find out what high volume means.

    Regards,

    Lloyd