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BQ77307
SLUSF60 – DECEMBER 2023
LFO Integrity Check—The device integrates a special hardware block that monitors if the LFO stops oscillating
or drops significantly in frequency versus its expected value. If this is detected, the device immediately
transitions into SHUTDOWN mode.
Internal Factory Trim Check—The device includes a check of the digital trim and setting information within
the device at initial power-up or after any full reset. If an error is detected during this check, the device will
immediately transition to SHUTDOWN mode.
Hardware Overtemperature Detector—The device integrates a hardware overtemperature detection circuit,
which determines when the die temperature passes an excessive temperature of approximately 120°C. If
this detector triggers, the device will automatically begin the sequence to enter SHUTDOWN, based on the
configuration setting.
7.6 Device Power Modes
7.6.1 Overview of Power Modes
The BQ77307 device supports a normal operating mode as well as a full shutdown mode, with the device able to
transition from NORMAL mode to SHUTDOWN mode autonomously, based on settings.
•
NORMAL mode: In this mode, the device evaluates system current, cell voltages, internal and thermistor
temperature, and various diagnostic checks, operates protections as configured, and provides interrupt and
status updates. Battery protections are enabled, and the FET drivers are typically enabled (in the absence of
any protection fault).
•
SHUTDOWN mode: The device is completely disabled (including the internal 1.8 V and REGOUT LDOs),
the CHG and DSG FETs are both disabled, and all battery protections are disabled. This is the lowest power
state of the device, which may be used for shipment or long-term storage. All register settings that were not
written into OTP by TI are lost when in SHUTDOWN mode.
The device also includes a CONFIG_UPDATE mode, which is used for parameter updates. Transitioning
between operational modes is shown in
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BQ77307 Power
Modes.
SHUTDOWN MODE
All protections
and regulators off
< 1 uA typ
Rising edge on
TS pin or rising
edge on VC0 pin
NORMAL MODE
Protections on,
REGOUT on
5 uA ~ 8 uA typ
Blue = programmable
Green = current
Figure 7-5. BQ77307 Power Modes
Product Folder Links:
Low V
or low cell
BAT
voltage or high die
temperature or
select faults
Copyright © 2023 Texas Instruments Incorporated
BQ77307
www.ti.com
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