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bq27350

Single Cell Li-Ion Battery Manager

With Impedance Track Fuel Gauge Technology

SLUS754 – MARCH 2007

4.1.1.1 Control( ): 0x00/0x01

Issuing a Control( ) command requires a subsequent two-byte sub-command (little endian format:

least-significant byte written to lowest address location). These additional bytes specify the particular

control function desired. The Control( ) command allows the host to control specific features of the

bq27350 during normal operation and additional features when the bq27350 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 (eg: "bq27350")

FW VERSION

0x0002

Yes

Reports the firmware version on the device type

HW VERSION

0x0003

Yes

Reports the hardware version of the device type

DFCHECKSUM

0x0004

No

Enables a DF checksum to be generated and reports on a read

RESET DATA

0x0005

No

Returns reset data

Reserved

0x0006

No

Not to be used

PREV_MACWRITE

0x0007

No

Returns previous MAC command code

Reports the chemical identifier of the ImpedanceTrack™

CHEMID

0x0008

Yes

configuration

BOARD OFFSET

0x0009

No

Forces the device Board Offset to be measured and stored

CC INT OFFSET

0x000b

No

Forces the device to measure and store the internal CC offset

SET HIBERNATE

0x0011

Yes

Forces DF:Pack Configuration [HIBERNATE] to 1

CLEAR HIBERNATE

0x0012

Yes

Forces DF:Pack Configuration [HIBERNATE] to 0

SEALED

0x0020

No

Places the bq27350 in SEALED access mode

IT ENABLE

0x0021

No

Enables the ImpedanceTrack™ algorithm

IFCHECKSUM

0x0022

No

Reports the instruction flash checksum

CALMODE

0x0040

No

Places the bq27350 in calibration mode

RESET

0x0041

No

Forces a full reset of the bq27350

CONTROL STATUS: 0x0000

Instructs the gas gauge to return status information to Control addresses 0x00/0x01. The status

word should include the following information.

Table 4-3. CONTROL STATUS Flags

Flags( )

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

High Byte

–

FAS

SS

CSV

CCA

BCA

–

–

Low Byte

–

–

–

–

LDMD

RUP_DIS

VOK

QEN

FAS = Full access sealed (Sealed = 1)

SS = Sealed state (Sealed = 1)

CSV = Indicates a valid DF checksum has been generated

CCA = Coulomb counter calibration active

BCA = Board calibration active

LDMD = Indicates Z-track alg, using const. power mode

RUP_DIS = Indicates Ra table updates disabled

VOK = Indicates voltages are OK for QMAX update if set

QEN = QMAX updates enabled if set

DEVICE TYPE: 0x0001

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

FW_VERSION: 0x0002

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

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GENERAL DESCRIPTION

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