bq27425-G1

SLUSAI6

– NOVEMBER 2011

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CONTROL_STATUS: 0x0000

Instructs the fuel gauge to return status information to control addresses 0x00/0x01. The status word includes the

following information.

Table 3. CONTROL_STATUS Bit Definitions

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

High Byte

RSVD

RSVD

SS

CALMODE

CCA

BCA

QMAX_UP

RES_UP

Low Byte

RSVD

HIBERNATE

RSVD

SLEEP

LDMD

RUP_DIS

VOK

RSVD

RSVD = Reserved.

SS = Status bit indicating the bq27425 is in the SEALED State. Active when set.

CALMODE = Status bit indicating the bq27425 is in calibration mode. Active when set.

Status bit indicating the bq27425 Coulomb Counter Auto-Calibration routine is active. The CCA routine will take place

CCA =

approximately 3 minutes and 45 seconds after the initialization. Active when set.

BCA = Status bit indicating the bq27425 board calibration routine is active. Active when set.

Status bit indicating Qmax has Updated. True when set. This bit is cleared after power on reset or when [BAT_DET] bit is

QMAX_UP =

set. When this bit is cleared, it enables fast learning of battery Qmax.

Status bit indicating that resistance has been updated. True when set. This bit is cleared after power on reset or when

RES_UP = [BAT_DET] bit is set. Also this bit can only be set after Qmax is updated or QMAXU is set. When this bit is cleared, it

enables fast learning of battery impedance.

HIBERNATE = Status bit indicating a request for entry into HIBERNATE from SLEEP mode has been issued. True when set. Default is 0.

SLEEP = Status bit indicating the bq27425 is in SLEEP mode. True when set.

Status bit indicating the algorithm is using constant-power mode. True when set. Default is 1. Note: The bq27425 always

LDMD =

uses constant-power mode.

RUP_DIS = Status bit indicating the bq27425 Ra table updates are disabled. Updates disabled when set..

VOK = Status bit indicating cell voltages are OK for Qmax updates. True when set.

DEVICE_TYPE: 0x0001

Instructs the fuel gauge to return the device type to addresses 0x00/0x01.

FW_VERSION: 0x0002

Instructs the fuel gauge to return the firmware version to addresses 0x00/0x01.

HW_VERSION: 0x0003

Instructs the fuel gauge to return the hardware version to addresses 0x00/0x01.

PREV_MACWRITE: 0x0007

Instructs the fuel gauge to return the previous command written to addresses 0x00/0x01. The value returned is

limited to less than 0x0015.

BAT_INSERT: 0X000C

This subcommand forces the Flags() [BAT_DET] bit to set when the battery insertion detection is disabled via

OpConfig[BIE=0]. In this case, the gauge does not detect battery insertion from the BIN pin

’s logic state, but

relies on the BAT_INSERT host subcommand to indicate battery presence in the system. This subcommand also

starts Impedance Track

™ gauging.

BAT_REMOVE: 0X000D

This subcommand forces the Flags() [BAT_DET] bit to clear when the battery insertion detection is disabled via

OpConfig[BIE=0]. In this case, the gauge does not detect battery removal from the BIN pin

’s logic state, but

relies on the BAT_REMOVE host subcommand to indicate battery removal from the system.

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Copyright

© 2011, Texas Instruments Incorporated