BQ24195: BQ24195 Not charging

Alejandro Cabrerizo

Part Number: BQ24195
Other Parts Discussed in Thread: BQ24190

Hello, I recently built a prototype board where the BQ24195 charges a Lion cell and also boosts the voltage to be outputted.

I can write and read its registers from the MCU but I am unable to get it to start charging.

Registers:

register 0: 10
register 1: 25
register 2: 52
register 3: 17
register 4: 174
register 5: 154
register 6: 3
register 7: 75
register 8: 4
register 9: 4

Any clue on why is that happening?

Schematic: https://imgur.com/15RwhoF

Thank you

over 4 years ago

0 Ning T over 4 years ago

TI__Mastermind 46671 points

Hi,

Please visit https://e2e.ti.com/support/power-management/f/196/t/877725 for BQ2419X: Schematic Review and PCB Layout Design Tips and https://e2e.ti.com/support/power-management/f/196/t/875388 for BQ2419X/2429x FAQs. BQ24195 is similar to BQ24190.

Please check the register readings and see if there's any faults or DPM etc , especially for REG07, REG08 and REG09.

Thanks,

Ning.

0 Alejandro Cabrerizo over 4 years ago in reply to Ning T

Prodigy 70 points

Hi,

Thank you for answering. It seems like there are no faults and it is not in DMP mode (The register values when the IC should start charging are posted in the original post)

From the schematic checklist, there are 2 things that seems like I didn't follow:

1. The D+ and D- pins are floating instead of connected together.

2. The OTG pin is always pulled HIGH.

Do you think that any of those things might prevent the IC from starting the charge cycle?

Thank you

0 Ning T over 4 years ago in reply to Alejandro Cabrerizo

TI__Mastermind 46671 points

Hi,

Not sure yet. What are your test conditions such as VBUS (voltage at VBUS pin), VBAT (voltage at BAT pin), IBAT, VSYS, ISYS?

Thanks,

Ning.

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BQ24195: BQ24195 Not charging