BQ40Z50-R2: DSG/CHG_FET_TOGGLE command

user6241791

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50,

Hello,
I have been trying to implement a way to manually command the DSG/CHG FET ON or OFF individually.The protection controlled by MCU.

I set FET_EN = 0 and disable the seal mode,i want to use the DSG/CHG_FET_TOGGLE command manually control the DSG/CHG FET ON or OFF individually.

But i found that when I set DSG_FET_TOGGLE=1, If the dsg current value above a certain threshold,the CHG will automatic turn on,even if the CHG_FET_TOGGLE=0.

This can also happen when in CHG mode.DSG_FET_TOGGLE=0,but the DSG FET turn on.

Is there any way to manually command the DSG/CHG FET ON or OFF?

over 5 years ago

0 Steven Yao over 5 years ago

TI__Genius 12215 points

The FW designed this way to prevent the body diode damaged for over heating, when charge diode is off and you turn on the dsg fet, the current flow through the body diode of the charging fet, if the current is too high, FET could be damaged due to overheating problem.

0 user6241791 over 5 years ago in reply to Steven Yao

Prodigy 140 points

In my application,there must be a way for me to manually command the DSG/CHG FET ON or OFF,I know that the DSG and CHG FETs can be individually controlled, but i don't know the register address.can you tell me the address of the private register to control the fets individually.Just like the private register 0x4cc4 in BQ40z80.

0 Steven Yao over 5 years ago in reply to user6241791

TI__Genius 12215 points

But the command or register is not implemented in bq40z50, the firmware takes over the control to the DSG and CHG pins of AFE

0 user6241791 over 5 years ago in reply to Steven Yao

Prodigy 140 points

Is there any way to manually command the DSG/CHG FET ON or OFF?

I found a register in bq40z50-R2 TRF manual，this register can be used for control the DSG/CHG FET ON or OFF individually?

0 Steven Yao over 5 years ago in reply to user6241791

TI__Genius 12215 points

This is only for logging the internal AFE Control Register content when the PF event occurs, yet there is no way to control this register with SMBUS command.

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BQ40Z50-R2: DSG/CHG_FET_TOGGLE command