BQ24168: BQ24168 register issue

Chen Bogey8

Part Number: BQ24168

Hi Sir

Right now we have a problem to use BQ24168. The B1 and B2 bit of Register 01 does not contain 0x10 when we pull out the battery.

May you pls advise us suggestion?

Bogey

over 8 years ago

0 Jeff F over 8 years ago

TI__Guru**** 165786 points

Hi Chen,

Battery detection only works if termination is enabled and if the capacitor on the BAT pin is small (~10-100uF).

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff

we Bat pin is connect 1uF capacitor, and TE is use default.

but but still get 0x0 on both B1 and B2 for Reg 01.

May you have other suggestion?

Bogey

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

Where is the TS voltage?

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff

it seems Vts impact(customer measure is 3V). may we have excel or other tool to calculate RHI/RLO?

if no use this pin, may we direct connect 10K to GND?

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

2500.bq2416x_DesignHelp_V1.xlsxHi Chen,

If TS is not used, please place a resistor divider of 10kohm/10kohm between REGN, TS and GND to set TS at 1/2 V(REGN). I have attached a spreadsheet that can help size the divider it you decide to use the TS function.

0 Jeff F over 8 years ago in reply to Jeff F

TI__Guru**** 165786 points

Chen,

If TS is not use, you can also tie the TS pin to REGN to disable it.

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff

we have another issue thay we set 0x03 = 0x92 in power on, but after around 300m Second, the 0x03=0x16 automatically.

May you pls advise us some suggestion?

Bogey

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

Bogey,

Are you resetting the watchdog timer? Are there any faults that occur during this time? Certain faults cause the battery regulation voltage to reset to default = 3.60V.

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff

Customer only write value 0x8C to memory 0x02 to reset the chip when power-on.

Bogey

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

Bogey

Default BATREG = 3.6V. If the battery attached is higher than 3.6V, the IC will report BATOVP. For the registers to maintain settings other than default, the host must write to the watchdog timer every 30s or so.

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff

It is very strange that the register is happen when Battery hot SWAP.

May you have idea?

Bogey

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

Chen,

When you pull out the battery, are you disconnecting TS pin too? If so, if the TS connection is removed first, the TS fault occurs and disables termination, which also disables battery detection.

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff
BQ24168 this way the charging line,when another circuit has a large current demand, it will cut off the BQ24168 the "IN" pin power supply; when the battery is not connected and IN for the case of open circuit, whether the BQ24168 parameters can not be retained?
Is there any way to keep parameters?
Bogey

0 Jeff F over 8 years ago in reply to Chen Bogey8

TI__Guru**** 165786 points

Bogey,

Unfortunately no. Power must be applied at either BAT or IN or USB in order for the I2C registers to retain their values.

0 Chen Bogey8 over 8 years ago in reply to Jeff F

Mastermind 9990 points

Hi Jeff
Got it and thanks~~
Bogey

Power management

Power management forum

BQ24168: BQ24168 register issue