BQ27500_08 Datasheet, PDF (11/39 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

www.ti.com
bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785D – SEPTEMBER 2007 – REVISED APRIL 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, with the low byte (0x00) being
the number of full resets and the high byte (0x01) the number of partial resets.
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 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 coulomb counter offset is also 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
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