BQ76972: How to enable fet

chethan TR

Prodigy 10 points

Part Number: BQ76972

Tool/software:

i am trying to enable and disable AFE using i2c subcommand 0x0096 ALL_FETS_ON() 0x0095 ALL_FETS_Off()

how to send this sub command to AFE can I get example project for this FET enable and disable

over 1 year ago

+1 Thomas Rainey over 1 year ago

TI__Expert 4320 points

Hi,

You can refer to the BQ769x2 Software Development Guide (Rev. B) for information and examples on I2C communication.

Best regards,

Thomas Rainey

0 chethan TR over 1 year ago in reply to Thomas Rainey

Prodigy 10 points

i tried this example But it is not working can I get commands for the settings

0 chethan TR over 1 year ago in reply to chethan TR

Prodigy 10 points

i am trying to on and off fet through 0x0096 and 0x0095 subcommands but i am not able to drive fet on

if I sends command 0x0022 fet on it work only for one time if i send 0x0095 to turn off the Fet will turn off But again it is not turing on for 0x0022

0 Thomas Rainey over 1 year ago in reply to chethan TR

TI__Expert 4320 points

Hello,

The FET_EN bit it only used to toggle FET Test mode.

This bit is not used to turn on and off the FETs.

This bit needs to be set to 1 in order to use commands like 0x0095 ALL_FETS_OFF() and 0x0096 ALL_FETS_ON().

Best regards,

Thomas Rainey

0 chethan TR over 1 year ago in reply to Thomas Rainey

Prodigy 10 points

I tride this Now FET_EN is one but i am getting voltage (signal) at DSG pin 43 (48+4)volts but not in Charge pin 45 what need to do for drive the charge pin

i am giving command ALL_FETS_ON()

0 Thomas Rainey over 1 year ago in reply to chethan TR

TI__Expert 4320 points

Hi Chethan,

Is the device in SLEEP MODE? This may prevent the CHG pin from being driven high.

Best regards,

Thomas Rainey

0 chethan TR over 1 year ago in reply to Thomas Rainey

Prodigy 10 points

I am sending the command to wake up but it is not working for charge

0 Thomas Rainey over 1 year ago in reply to chethan TR

TI__Expert 4320 points

Hello Chethan,

Can you send a logic analyzer capture of how you are sending the command?

Best regards,

Thomas Rainey

0 chethan TR over 1 year ago in reply to Thomas Rainey

Prodigy 10 points

Hello Thomas Can you please give me very basic example to turn on and off the CHG and DSG pin without any protection or nothing can I get a command sequence or basic example project

0 chethan TR over 1 year ago in reply to Thomas Rainey

Prodigy 10 points

Hello Thomas Can you please give me very basic example to turn on and off the CHG and DSG pin without any protection or nothing can I get a command sequence or basic example project

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BQ76972: How to enable fet