Datasheet

bq27541-G1

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SLUSAL6C –NOVEMBER 2011–REVISED OCTOBER 2012

CLEAR_HIBERNATE: 0x0012

Instructs the fuel gauge to force the CONTROL_STATUS [HIBERNATE] bit to 0. This will prevent the gauge from

entering the HIBERNATE power mode after the transition to SLEEP power state is detected unless Voltage() is

less than Hibernate V. It can also be used to force the gauge out of HIBERNATE mode.

SET_SHUTDOWN: 0x0013

Sets the CONTROL_STATUS [SHUTDWN] bit to 1, thereby enabling the SE pin to change state. The Impedance

Track algorithm controls the setting of the SE pin, depending on whether the conditions are met for fuel gauge

shutdown or not.

CLEAR_SHUTDOWN: 0x0014

Disables the SE pin from changing state. The SE pin is left in a high-impedance state.

SET_HDQINTEN: 0x0015

Instructs the fuel gauge to set the CONTROL_STATUS [HDQIntEn] bit to 1. This will enable the HDQ Interrupt

function. When this subcommand is received, the device will detect any of the interrupt conditions and assert the

interrupt at one second intervals until the CLEAR_HDQINTEN command is received or the count of

HDQHostIntrTries has lapsed (default 3).

CLEAR_HDQINTEN: 0x0016

Instructs the fuel gauge to set the CONTROL_STATUS [HDQIntEn] bit to 0. This will disable the HDQ Interrupt

function.

STATIC_CHEM_DF_CHKSUM: 0x0017

Instructs the fuel gauge to calculate chemistry checksum as a 16-bit unsigned integer sum of all static chemistry

data. The most significant bit (MSB) of the checksum is masked yielding a 15-bit checksum. This checksum is

compared with value stored in the data flash Static Chem DF Checksum. If the value matches, the MSB will be

cleared to indicate pass. If it does not match, the MSB will be set to indicate failure. The checksum can be used

to verify the integrity of the chemistry data stored internally.

SEALED: 0x0020

Instructs the gas gauge to transition from UNSEALED state to SEALED state. The gas gauge should always be

set to SEALED state for use in customer’s end equipment as it prevents spurious writes to most Standard

Commands and blocks access to most data flash.

IT ENABLE: 0x0021

This command forces the fuel gauge to begin the Impedance Track™ algorithm, sets bit 2 of UpdateStatus and

causes the [VOK] and [QEN] flags to be set in the CONTROL_STATUS register. [VOK] is cleared if the voltages

are not suitable for a Qmax update. Once set, [QEN] cannot be cleared. This command is only available when

the fuel gauge is UNSEALED and is typically enabled at the last step of production after system test is

completed.

RESET: 0x0041

This command instructs the gas gauge to perform a full reset. This command is only available when the gas

gauge is UNSEALED.

EXIT_CAL: 0x0080

This command instructs the gas gauge to exit calibration mode.

ENTER_CAL: 0x0081

This command instructs the gas gauge to enter calibration mode.

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