BQ27505 Datasheet, PDF (13/42 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge

Not Recommended for New Designs
bq27505
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SLUS884 – FEBRUARY 2009
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 OCV CMD: 0X000C
This command is to request the gauge to take a OCV reading. This command can only be issued after the
[INICOMP] has been set, indicating the initialization has been completed. The OCV measurement take
place at the beginning of the next repeated 1s firmware synchronization clock. The measurement takes
about 183ms. During the same time period, the SOC_INT will be negated. The host should use this signal
to reduce the load current below the C/20 in 8ms for a valid OCV reading. The OCV command [OCVFAIL]
bit will be set if the OCV_CMD is issued when [CHG_INH] is set.
4.1.1.1.13 BAT_INSERT: 0X000D
This command is to force the BAT_DET bit to be set when the battery insertion detection is disabled.
When the BIE is set to 0, the battery insertion detection is disabled. The gauge relies on the host to inform
the battery insertion with this command to set the BAT_DET bit.
4.1.1.1.14 BAT_REMOVE: 0X000E
This command is to force the BAT_DET bit to be clear when the battery insertion detection is disabled.
When the BIE is set to 0, the battery insertion detection is disabled. The gauge relies on the host to inform
the battery insertion with this command to set the BAT_DET bit.
4.1.1.1.15 SET_HIBERNATE: 0x0011
Instructs the fuel gauge to force the CONTROL_STATUS [HIBERNATE] bit to 1. This will allow 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.
4.1.1.1.16 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.
4.1.1.1.17 ENABLE SLEEP+ MODE: 0X0013
Instructs the fuel gauge to set the CONTROL_STATUS [SNOOZE] bit to 1. This will enable the SLEEP+
mode. The gauge will enter SLEEP+ power mode after the transition conditions are meet.
4.1.1.1.18 DISABLE SLEEP+ MODE: 0X0014
Instructs the fuel gauge to set the CONTROL_STATUS [SNOOZE] bit to 0. This will disable the SLEEP+
mode. The gauge will exit from the SLEEP+ power mode after the SNOOZ bit is cleared.
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GENERAL DESCRIPTION
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