BQ27350 Datasheet, PDF (11/33 Pages) Texas Instruments – Single Cell Li-Ion Battery Manager With Impedance Track Fuel Gauge Technology

www.ti.com
bq27350
Single Cell Li-Ion Battery Manager
With Impedance Track Fuel Gauge Technology
SLUS754 – MARCH 2007
CAL MODE: 0x0040
This command instructs the gas gauge to enter calibration mode. This command is only available
when the gas gauge is UNSEALED.
RESET : 0x0041
This command instructs the gas gauge to perform a full reset. This command is only available
when the gas gauge is UNSEALED.
4.1.1.2 AtRate( ): 0x02/0x03
The AtRate( ) read-/write-word function is the first half of a two-function call-set used to set the AtRate
value used in calculations made by the AtRateTimeToEmpty( ) function. The AtRate( ) units are in mA.
The AtRate( ) value is a signed integer and both positive and negative values will be interpreted as a
discharge current value. The AtRateTimeToEmpty( ) function returns the predicted operating time at the
AtRate value of discharge. The default value for AtRate( ) is zero and will force AtRate( ) to return 65535.
4.1.1.3 AtRateTimeToEmpty( ): 0x04/0x05
This read-word function returns an unsigned integer value of the predicted remaining operating time if the
battery is discharged at the AtRate( ) value in minutes with a range of 0 to 65534. A value of 65535
indicates AtRate( ) = 0. The gas gauge updates AtRateTimeToEmpty( ) within 1s after the host sets the
AtRate( ) value. The gas gauge automatically updates AtRateTimeToEmpty( ) based on the AtRate( )
value every 1s.
4.1.1.4 Temperature( ): 0x06/0x07
This read-word function returns an unsigned integer value of the temperature in units of 0.1°K measured
by the gas gauge and has a range of 0 to 6553.5°K. The source of the measured temperature is
configured by the [TEMPS] bit in Pack Configuration register (see EXTENDED COMMANDS).
Table 4-4. Temperature Sensor Selection
TEMPS
0
1
Temperature( ) source
Internal Temperature Sensor
TS Input (default)
4.1.1.5 Voltage( ): 0x08/0x09
This read-word function returns an unsigned integer value of the measured cell-pack voltage in mV with a
range of 0 to 6000mV.
4.1.1.6 Flags( ): 0x0a/0x0b
This read-word function returns the contents of the gas-gauge status register, depicting current operation
status.
Submit Documentation Feedback
GENERAL DESCRIPTION
11