BQ25120A： how to exit from hz mode?

yancheng shen

Part Number: BQ25120A

how to exit from hz mode ? is toggle cd pin? or only set cd to high? when exit from hz mode ,need delay(how many times) to comunication i2c

over 7 years ago

0 Paul Yeh over 7 years ago

TI__Genius 16185 points

Yancheng,

1. /CD pin is Chip Disable. Drive CD low to place the part in High-Z mode with battery only present, or enable charging when VIN is valid. Drive CD high for Active Battery mode when battery only is present, and disable charge when VIN is present. CD is pulled low internally with 900 kΩ.

2. the resume time is 1ms max.

Thanks

0 yancheng shen over 7 years ago in reply to Paul Yeh

Intellectual 265 points

when the bq25120a is in hz mode ,no need to resume i2c ,or only when the HZ_MODE bit is writteb by the host need to resume i2c by toggle cd pin;

0 Gautham over 7 years ago in reply to yancheng shen

TI__Genius 12485 points

Yancheng,

If the /CD pin was pulled to low, on battery only mode, you are in HiZ. To exit HiZ and go to Active BAT, you will need to pull /CD pin high. You can communicate after 1ms delay.

Note that if you made any changes (VSYS or VLDO voltage), the changes are preserved even if you go to HiZ mode.

regards,

gautham

0 yancheng shen over 7 years ago in reply to Gautham

Intellectual 265 points

in what situation i need to toggle cd pin to resume i2c communication,

0 Gautham over 7 years ago in reply to yancheng shen

TI__Genius 12485 points

Yancheng,

When you are on battery only mode, you will need to raise /CD to get communication back.

Power management

Power management forum

BQ25120A： how to exit from hz mode?