BQ25970: TPS25750 + BQ25792 interrupt spamming IINDPM_FLAG and CHG_FLAG when battery is full and charging

tomas manno

Part Number: BQ25792
Other Parts Discussed in Thread: TPS25750, BQ25970,

Hello,

We have the custom patch in TPS25750, given here https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1049261/tps25750-configuration-request-tomas

We get this interrupt spamming IINDPM_FLAG and CHG_FLAG when battery is full and charging (connected to USB).

Here is serial log of the charger flags printed after receiving BQ_INT signal. These interrupts continue to spam about 1-10 interrupts per second. Charger Flag 0-3 corresponds to registers in datasheet.

ChargerFlag_0_Reg 0x80
ChargerFlag_1_Reg 0x80
ChargerFlag_2_Reg 0x0
ChargerFlag_3_Reg 0x0
Charge status changed to: 4 

ChargerFlag_0_Reg 0x80
ChargerFlag_1_Reg 0x80
ChargerFlag_2_Reg 0x0
ChargerFlag_3_Reg 0x0

ChargerFlag_0_Reg 0x0
ChargerFlag_1_Reg 0x0
ChargerFlag_2_Reg 0x0
ChargerFlag_3_Reg 0x0
Charge status changed to: 4 

ChargerFlag_0_Reg 0x80
ChargerFlag_1_Reg 0x80
ChargerFlag_2_Reg 0x0
ChargerFlag_3_Reg 0x0

ChargerFlag_0_Reg 0x0
ChargerFlag_1_Reg 0x0
ChargerFlag_2_Reg 0x0
ChargerFlag_3_Reg 0x0
Charge status changed to: 4

We read&clear all interrupts in charger flags 0-3 once we have received BQ_INT signal.

Are we doing something wrong, is there problem in our configuration, or is there another bug in this patch?

Why is the BQ25972 spamming this interrupt when battery is full and charger is attached after we clear it?

over 2 years ago

0 Jeff F over 2 years ago

TI__Guru*** 143910 points

Tomas,

Is this question about BQ25970 or BQ25792?

Regards,

Jeff

0 tomas manno over 2 years ago in reply to Jeff F

Prodigy 70 points

BQ25792. Sorry got the numbers wrong, I thought it was not listed as I searched for BQ25972, not BQ25792. Edited main post with correct numbers

0 Michael Emanuel35 over 2 years ago in reply to tomas manno

TI__Mastermind 29945 points

Dear Tomas,

Can you please capture a waveform of the input voltage, SW1, BAT voltage, and charge current when this is happening? Also, what is your IINPDM set to and I wanted to confirm your charge current?

Thanks,

Mike Emanuel

0 tomas manno over 2 years ago in reply to Michael Emanuel35

Prodigy 70 points

IINPDM is set to default (POR: 3000mA (12Ch)), as everything else.

But our BQ25972 has worked under these conditions before, with this configuration. Only difference is that TPS25750 patch has been updated.

0 Michael Emanuel35 over 2 years ago in reply to tomas manno

TI__Mastermind 29945 points

Dear Tomas,

I need more information about the battery charger to debug this issue. Can you please provide a waveform of the input voltage, SW1, BAT voltage, and charge current when this is happening? Can you share your schematic of the battery charger? What is your system load at this time? Are you in IINDPM and what is the charge status when this is happening?

Thanks,

Mike Emanuel

0 tomas manno over 2 years ago in reply to Michael Emanuel35

Prodigy 70 points

Seems that our problem was that BQ25972 was initialized before TPS25750 (which routes the i2c traffic).

Problem seems to be fixed.

Power management

Power management forum

BQ25970: TPS25750 + BQ25792 interrupt spamming IINDPM_FLAG and CHG_FLAG when battery is full and charging