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ZHCSCE2I October 2013 – March 2022 BQ76920 , BQ76930 , BQ76940

PRODMIX

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机械数据 (封装 | 引脚)

DBT|30
- MPDS019J

散热焊盘机械数据 (封装 | 引脚)

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8.4.2 SHIP Mode

SHIP mode is the basic and lowest power mode that BQ769x0 supports. SHIP mode is automatically entered during initial pack assembly and after every POR event. When the device is in NORMAL mode, it may enter SHIP by the host controller through a specific sequence of I²C commands.

In SHIP mode, only a minimum of blocks is turned on, including the VSTUP power supply and primal boot detector. Waking from SHIP mode to NORMAL mode requires pulling the TS1 pin greater than V_BOOT, which triggers the device boot-up sequence.

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 V_SHUT. 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 V_SHUT and rebooting by applying the appropriate V_BOOT signal to the TS1 pin. When designing with the BQ76930, the intermediate voltages (BAT–VC5x) and (VC5x–VSS) must each never fall below V_SHUT. If this occurs, a full device reset must be initiated by powering down both intermediate voltages (BAT–VC5x) and (VC5x–VSS) below V_SHUT and rebooting by applying the appropriate V_BOOT 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 fall below V_SHUT and then back up above V_PORA, 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 V_BOOT threshold on the TS1 pin. The BQ769x0 Boot Switch Alternatives Application Report details multiple methods for generating the needed signal on the TS1 pin.