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BQ24195L: I can not charge after solving output problem.

Chance Lee92
Prodigy 60 points
Part Number: BQ24195L

I could't got a voltage above 5V at PMID.

So I contacted and solved.

solved link : e2e.ti.com/.../616105

But the problem remains.

I can't charge in connect VBUS and about 5V.

Through the above process,
I can getting to 5.05V from PMID.

And than I write REG01[7] = 1 to reset.

0 1 2 3 4 5 6 7 8 9 a
37 1b 60 11 b2 9a 03 4b 00 10 23

Next I write REG01 = 0x2B to PMID output.
AND i write REG05 = 0x8A to Disable watchdog.

0 1 2 3 4 5 6 7 8 9 a
35 2b 60 11 b2 8a 03 4b c0 10 23

Next I connect VBUS with 5V(external voltage to charge).

0 1 2 3 4 5 6 7 8 9 a
35 2b 60 11 b2 8a 03 4b c0 00 23

result REG08[5:4] = 00 .....
Non-charged state.....

In this case how do I charge it?

PS.

OTG was pull-up (with SYS, 10kohm)

AND GND can be connected with a jumper.

We can't arbitrarily change the jumper in a real system.

If use OTG connect GND to problem solving, change the circuit??

(problem solving = I can chage and PMID output 5V More than.)

  • 0
    TI__Genius 10240 points
    The charging is to buck down the external adaptor voltage to charge the battery, REG01[5:4]=01, the power flow is from VBUS to PMID to SYS to BAT. REG08[5:4] indicates this charging mode.
    The OTG is to boost the battery voltage to 5.x V at PMID/VBUS, serving as a voltage source to power up other accessory, REG01[5:4]=10; the power flow is from BAT to VSYS to PMID to VBUS. The battery is discharging in OTG mode. When you enabled OTG, the charger could not be in charging mode.