bq27500-V130

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SLUS914A – OCTOBER 2009 – REVISED DECEMBER 2009

4.1.1.1

Control( ): 0x00/0x01

Issuing a Control( ) command requires a subsequent 2-byte subcommand. These additional bytes specify

the particular control function desired. The Control( ) command allows the system to control specific

features of the bq27500 during normal operation and additional features when the bq27500 is in different

access modes, as described in Table 4-2.

Table 4-2. Control( ) Subcommands

CNTL

SEALED

CNTL FUNCTION

DESCRIPTION

DATA

ACCESS

CONTROL_STATUS

0x0000

Yes

Reports the status of DF checksum, hibernate, IT, etc.

DEVICE_TYPE

0x0001

Yes

Reports the device type (e.g., "bq27500")

FW_VERSION

0x0002

Yes

Reports the firmware version of the device type

Enables a data flash checksum to be generated and

DF_CHECKSUM

0x0004

No

reports on a read

RESET_DATA

0x0005

Yes

Returns reset data

Reserved

0x0006

No

Not to be used

PREV_MACWRITE

0x0007

Yes

Returns previous MAC command code

Reports the chemical identifier of the Impedance Track

CHEM_ID

0x0008

Yes

configuration

Enables the BAT_LOW pin function for SOC1 and voltage

BATL_ENABLE

0x000d

Yes

detection when [BATL_CTL] bit is 0

BATL_DISABLE

0x000e

Yes

Forces the BAT_LOW pin to low when [BATL_CTL] bit is 0

SET_HIBERNATE

0x0011

Yes

Forces CONTROL_STATUS [HIBERNATE] to 1

CLEAR_HIBERNATE

0x0012

Yes

Forces CONTROL_STATUS [HIBERNATE] to 0

SET_SLEEP+

0x0013

Yes

Forces CONTROL_STATUS [SNOOZE] to 1

CLEAR_SLEEP+

0x0014

Yes

Forces CONTROL_STATUS [SNOOZE] to 0

SEALED

0x0020

No

Places the bq27500 in SEALED access mode

IT_ENABLE

0x0021

No

Enables the Impedance Track algorithm

CAL_MODE

0x0040

No

Places the bq27500 in calibration mode

RESET

0x0041

No

Forces a full reset of the bq27500

4.1.1.1.1 CONTROL_STATUS: 0x0000

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

includes the following information.

Table 4-3. CONTROL_STATUS Bit Definitions

Flags( )

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

High byte

–

FAS

SS

CSV

CCA

BCA

–

–

Low byte

–

HIBERNATE

SNOOZE

SLEEP

LDMD

RUP_DIS

VOK

QEN

FAS = Status bit indicating the bq27500 is in FULL ACCESS SEALED state. Active when set

SS = Status bit indicating the bq27500 is in SEALED state. Active when set

CSV = Status bit indicating a valid data flash checksum has been generated. Active when set

CCA = Status bit indicating the bq27500 coulomb counter calibration routine is active. Active when set. The first CCA routine takes place

approximately 1 minute after the initialization.

BCA = Status bit indicating the bq27500 board calibration routine is active. Active when set

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

SNOOZE = Status bit indicating the bq27500 SLEEP+ mode is enabled. True when set

SLEEP = Status bit indicating the bq27500 is in SLEEP mode. True when set

LDMD = Status bit indicating the bq27500 Impedance Track algorithm is using constant-power mode. True when set. Default is 0

(constant-current mode).

RUP_DIS = Status bit indicating the bq27500 Ra table updates are disabled. Updates disabled when set

VOK = Status bit indicating the bq27500 voltages are okay for Qmax. True when set

QEN = Status bit indicating the bq27500 Qmax updates are enabled. True when set

Copyright © 2009, Texas Instruments Incorporated

GENERAL DESCRIPTION

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