BQ7693003DBT datasheet(31/63 Pages) TI1

31 / 63 page

bq76920, bq76930, bq76940

www.ti.com

SLUSBK2F – OCTOBER 2013 – REVISED NOVEMBER 2015

To enter SHIP mode from NORMAL mode, the [SHUT_A] and [SHUT_B] bits in the SYS_CTRL1 register

must be written with specific patterns across two consecutive writes:

•

Write #1: [SHUT_A] = 0, [SHUT_B] = 1

•

Write #2: [SHUT_A] = 1, [SHUT_B] = 0

Note that [SHUT_A] and [SHUT_B] should each be in a 0 state prior to executing the shutdown command

above. If this specific sequence is entered into the device, the device transitions into SHIP mode. If any

other sequence is written to the [SHUT_A] and [SHUT_B] bits or if either of the two patterns is not

correctly entered, the device will not enter SHIP mode.

CAUTION

DO NOT OPERATE THE DEVICE BELOW POR. When designing with the

bq76940,

the

intermediate

voltages

(BAT–VC10x),

(VC10x–VC5x),

and

(VC5x–VSS) must each never fall below VSHUT. When this occurs, a full device

reset must be initiated by powering down all three intermediate voltages

(BAT–VC10x), (VC10x–VC5x), and (VC5x–VSS) below VSHUT and rebooting by

applying the appropriate VBOOT signal to the TS1 pin. When designing with

the bq76930, the intermediate voltages (BAT–VC5x) and (VC5x–VSS) must

each never fall below VSHUT. If this occurs, a full device reset must be initiated

by powering down both intermediate voltages (BAT–VC5x) and (VC5x–VSS)

below VSHUT and rebooting by applying the appropriate VBOOT signal to the

TS1 pin.

The device will also enter SHIP mode during a POR event; however, this is not a recommended method

of SHIP mode entry. If any of the supply-side voltages below fall below VSHUT and then back up above

VPORA, the device defaults into the SHIP mode state. This is similar to an initial pack assembly condition.

In order to exit SHIP mode into NORMAL mode, the device must follow the standard boot sequence by

applying a voltage greater than the VBOOT threshold on the TS1 pin.

Detailed Description

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Product Folder Links: bq76920 bq76930 bq76940

BQ7693003DBT Datasheet(PDF) 31 Page - Texas Instruments