bq27500-V120

System-Side Impedance Track™ Fuel Gauge

www.ti.com

SLUS880 – OCTOBER 2008

4.1.1.1.2 DEVICE_TYPE: 0x0001

Instructs the fuel gauge to return the device type to addresses 0x00/0x01.

4.1.1.1.3 FW_VERSION: 0x0002

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

4.1.1.1.4 HW_VERSION: 0x0003

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

4.1.1.1.5

DF_CHECKSUM: 0x0004

Instructs the fuel gauge to compute the checksum of the data flash memory. Once the checksum has

been calculated and stored, CONTROL_STATUS [CVS] is set. The checksum value is written and

returned to addresses 0x00/0x01 (UNSEALED mode only). The checksum is not calculated in SEALED

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

4.1.1.1.6 RESET_DATA: 0x0005

Instructs the fuel gauge to return the reset data to addresses 0x00/0x01.

4.1.1.1.7 PREV_MACWRITE: 0x0007

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

4.1.1.1.8 CHEM_ID: 0x0008

Instructs the fuel gauge to return the chemical identifier for the Impedance Track™ configuration to

addresses 0x00/0x01.

4.1.1.1.9 Board_OFFSET: 0x0009

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

short applied across the sensing resistor (SR) inputs. The difference between the two measurements is

the board offset. After a delay of approximately 32 seconds, this offset value is returned to addresses

0x00/0x01 and written to data flash. The CONROL STATUS [BCA] is also set. The user must prevent any

charge or discharge current from flowing during the process. This function is only available when the fuel

gauge is UNSEALED. When SEALED, this command only reads back the board-offset value stored in

data flash.

4.1.1.1.10 CC_INT_OFFSET: 0X000A

Control data of 0x000a instructs the fuel gauge to compute the coulomb counter offset with internal short

applied across the SR inputs. The offset value is returned to addresses 0x00/0x01, after a delay of

approximately 16 seconds. This function is only available when the fuel gauge is UNSEALED. When

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

4.1.1.1.11

WRITE_OFFSET: 0X000B

Control data of 0x000b causes the fuel gauge to write the coulomb counter offset to data flash.

4.1.1.1.12 SET_HIBERNATE: 0x0011

Instructs the fuel gauge to force the CONTROL_STATUS [HIBERNATE] bit to 1. This allows the gauge to

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

[HIBERNATE] bit is automatically cleared upon exiting from HIBERNATE mode.

4.1.1.1.13 CLEAR_HIBERNATE: 0x0012

Instructs the fuel gauge to force the CONTROL_STATUS [HIBERNATE] bit to 0. This prevents the gauge

from entering the HIBERNATE power mode after the transition to the SLEEP power state is detected. It

can also be used to force the gauge out of HIBERNATE mode.

Submit Documentation Feedback

GENERAL DESCRIPTION

11