BQ27510_08 Datasheet, PDF(10/36 Page) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Direct Battery Connection

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SLUS816A â MARCH 2008 â REVISED JUNE 2008.......................................................................................................................................................... www.ti.com

DF_CHECKSUM: 0x0004

Instructs the fuel 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 fuel gauge to return the reset data to addresses 0x00/0x01, with the low byte (0x00) being the

number of full resets and the high byte (0x01) the number of partial resets.

PREV_MACWRITE: 0x0007

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

CHEM_ID: 0x0008

Instructs the fuel gauge to return the chemical identifier for the Impedance Trackâ¢ configuration to addresses

0x00/0x01.

BOARD_OFFSET: 0x0009

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

applied across the 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.

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.

WRITE_OFFSET: 0x000B

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

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.

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 SLEEP power state is detected. It can also be used

to force the gauge out of HIBERNATE mode.

SEALED: 0x0020

Instructs the fuel gauge to transition from UNSEALED state to SEALED state. The fuel gauge should always be

set to SEALED state for use in end equipment.

IT_ENABLE: 0x0021

This command forces the fuel gauge to begin the Impedance Trackâ¢ algorithm, sets the active UpdateStatus n

location to 0x01 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 fuel gauge is UNSEALED.

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