BQ27350 Datasheet, PDF (10/33 Pages) Texas Instruments – Single Cell Li-Ion Battery Manager With Impedance Track Fuel Gauge Technology

bq27350
Single Cell Li-Ion Battery Manager
With Impedance Track Fuel Gauge Technology
SLUS754 – MARCH 2007
www.ti.com
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.
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GENERAL DESCRIPTION
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