SHUTDOWN Mode
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SLUUBD3D–September 2015–Revised September 2018
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Power Modes
8.4.2 Time Based Shutdown
The device can be configured to shut down after staying in SLEEP mode without communication for a
preset time interval specified in Auto Ship Time. Setting the PowerConfig[AUTO_SHIP_EN] = 1 enables
this feature. If Auto Ship Time is set to 0, this feature is disabled. Any communication to the device will
restart the timer. When the timer reaches the Auto Ship Time, the time based shutdown effectively
triggers the MAC shutdown command to start the shutdown sequence. The device returns to NORMAL
mode when voltage at PACK pin > V
STARTUP
.
Class Subclass Name Type Min Max Default Unit
Settings Configuration Power Config H1 0x00 0x01 0x00 Hex
7 6 5 4 3 2 1 0
RSVD RSVD RSVD RSVD RSVD RSVD RSVD
AUTO_SHIP
_EN
RSVD (Bits 7–1): Reserved. Do not use.
AUTO_SHIP_EN (Bit 0): Automatically shut down for shipment
1 = Enable auto shutdown after the device is in SLEEP mode without communication for a set
period of time.
0 = Disable auto shutdown feature
8.4.3 ManufacturerAccess() MAC Shutdown
In SHUTDOWN mode, the device turns off the FETs after FET Off Time, and then shuts down to
minimize power consumption after Delay time. Both FET Off Time and Delay time are referenced to the
time the gauge receives the command. Thus, the Delay time must be set longer than the FET Off Time.
The device returns to NORMAL mode when voltage at TS1 pin > V
BOOT
. The device can be sent to this
mode with the ManufacturerAccess() Shutdown command if Current() = 0 and OperationStatus()
[DSG] = 1.
8.5 Power Mode Indication (PWRM)
The PWRM pin can be used to indicate the power mode of the bq78350-R1. The PWRM has the following
conditions:
• PWRM is High-Z (externally pulled high):
– bq78350-R1 is in NORMAL mode.
– bq78350-R1 is in SLEEP mode AND SBS Gauging Configuration[PWRMSleep] = 1.
– Once in SHUTDOWN mode, the device has no control over PWRM.
• PWRM is Low:
– bq78350-R1 is in SLEEP mode AND SBS Gauging Configuration[PWRMSleep] = 0.
– bq78350-R1 prepares to enter SHUTDOWN mode.
This pin can be used to control other external circuit elements based on the power mode state of the
bq78350-R1.
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