www.ti.com

bq27350

Single Cell Li-Ion Battery Manager

With Impedance Track Fuel Gauge Technology

SLUS754 – MARCH 2007

HW_VERSION: 0x0003

Instructs the gas gauge to return the hardware version to addresses 0x00/0x01.

DF CHECKSUM: 0x0004

Instructs the gas gauge to compute the checksum of the data flash memory. The checksum value

is written and returned to addresses 0x00/0x01 (UNSEALED mode only). The checksum will not be

calculated in SEALED mode; however, the checksum value can still be read.

RESET_DATA: 0x0005

Instructs the gas gauge to return the reset data to addresses 0x00/0x01, with the low-byte being

the number of partial resets and the high-byte the number of full resets.

PREV_MACWRITE: 0x0007

Instructs the gas gauge to return the previous command written to addresses 0x00/0x01.

CHEM ID: 0x0008

Instructs the gas gauge to return the chemical identifier for the ImpedanceTrack™ configuration to

addresses 0x00/0x01.

BOARD_OFFSET: 0x0009

Instructs the gas gauge to compute the coulomb counter offset with internal short and without

internal short applied across the SR inputs. The difference between the two measurements is the

Board Offset. The Board Offset shall be written to data flash and should also be returned to

addresses 0x00/0x01. User will need to prevent any charge or discharge current from flowing

during the process. This function is only available when the gas gauge is UNSEALED. When

SEALED, this command will only read back the Board Offset value stored in data flash.

CC_INT_OFFSET: 0x000B

Instructs the gas gauge to compute the coulomb counter offset with internal short applied across

the SR inputs. The offset value shall be written to Data Flash and should also be returned to

addresses 0x00/0x01. This function is only available when the gas gauge is UNSEALED. When

SEALED, this command will only read back the CC_INT_OFFSET value stored in data flash.

SET_HIBERNATE: 0x0011

Instructs the gas gauge to force Pack Configuration’s [HIBERNATE] bit to 1. This will allow the

gauge to enter the HIBERNATE power mode after the transition to SLEEP power state is detected.

CLEAR_HIBERNATE: 0x0012

Instructs the gas gauge to force Pack Configuration’s [HIBERNATE] bit to 0. This will prevent the

gauge from entering the HIBERNATE power mode after the transition to SLEEP power state is

detected.

SEALED: 0x0020

Instructs the gas gauge to transition from UNSEALED state to SEALED state. The gas gauge

should always be set to SEALED state for use in customer’s end equipment.

IT ENABLE: 0x0021

This command forces the gas gauge to begin the Impedance Track™ algorithm, sets

UpdateStatus to 0x04 and causes the [VOK] and [QEN] flags to be set in the CONTROL STATUS

register. [VOK] is cleared if the voltages are not suitable for a Qmax update. Once set, [QEN]

cannot be cleared. This command is only available when the gas gauge is UNSEALED.

IF CHECKSUM: 0x0022

This command instructs the gas gauge to compute the instruction flash checksum. In UNSEALED

mode, the checksum value is returned to addresses 0x00/0x01. The checksum will not be

calculated in SEALED mode; however, the checksum value can still be read.

GENERAL DESCRIPTION

10

Submit Documentation Feedback