BQ27426: bq27426 Questions.

Ian Wang

Mastermind 29690 points

Part Number: BQ27426

Hi Sir,

Pls kindly help for bq27426 questions as below, thanks.

Is it means need to try again CFGUPDATE or it means gauge initial fail If MCU read gauge FW VER not 0202?

W: AA 00 02 00

C: AA 00 02 02

5.1.3 FW_VERSION: 0x0002

Instructs the fuel gauge to return the firmware version to addresses 0x00 and 0x01.

need/no need to do CFGUPDATE can confirm by FW VER? or ITPOR of FLAG REG?

ITPOR = Indicates a POR or RESET subcommand has occurred. If set, this bit generally indicates that the RAM

configuration registers have been reset to default values and the host should reload the configuration

parameters using the CONFIG UPDATE mode. This bit is cleared after the SOFT_RESET subcommand is received.

Thanks, Ian.

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Ian,

We will take a look and get back to you.

Andy

0 Dominik Hartl11 over 5 years ago

TI__Guru 60916 points

These flashstream commands mean that the script expects that the gauge returns 02 02 when reading from register 0x00/0x01 after issuing sub-command 0x0002, FW_VERSION.

You don't need to issue the configuration update command to read data from the gauge. So if you just want to read CONTROL_STATUS() or Flags(), you don't need to issue CFGUPDATE first.

Power management

Power management forum

BQ27426: bq27426 Questions.