9.4 Device Functional Modes
The BQ25157 has four main modes of operation: Active Battery Mode, Low Power Mode and Ship Mode which
are battery only modes and Charge/Adapter Mode when a supply is connected to IN.
summarizes the functions that are active for each operation mode. Each mode is discussed in further detail in
the following sections in addition to the device's power-up/down sequences.
Table 9-7. Function Availability Based on Primary Mode of Operation
FUNCTION
CHARGE/ ADAPTER
MODE
SHIP MODE
LOW POWER
MODE
ACTIVE BATTERY MODE
VOVP
Yes
No
Yes
Yes
VUVLO
Yes
Yes
Yes
Yes
BATOCP
Yes
No
No
Yes
BATUVLO
Yes
No
Yes
Yes
VINDPM
If enabled
No
No
No
DPPM
If enabled
No
No
No
VDD
Yes
No
Yes
Yes
LS/LDO
Yes
No
If enabled
If enabled
BATFET
Yes
No
Yes
Yes
TS Measurement
Yes
No
No
If enabled
Battery Changing
If enabled
No
No
No
ILIM
Yes (Register Value)
No
No
No
MR input
Yes
Yes
Yes
Yes
LP input
No
No
Yes
Yes
INT output
Yes
No
No
Yes
I
2
C
Yes
No
No
Yes
CE input
Yes
No
No
No
ADC
Yes
No
No
Yes
9.4.1 Ship Mode
Ship Mode is the lowest quiescent current state for the device. Ship Mode latches off the device and BAT FET
until V
IN
> V
UVLO
or the MR button is depressed for t
WAKE1
and released. Ship mode can be entered regardless
of the state of CE. The device will also enter Ship Mode upon battery insertion when no valid VIN is present. If
the EN_SHIPMODE is written to a 1 while a valid input supply is connected, the device will wait until the IN
supply is removed to enter ship mode. If the MR pin is held low when the EN_SHIPMODE bit is set, the device
will wait until the MR pin goes high before entering Ship Mode.
shows this behavior. The battery
voltage must be above the maximum programmable V
BATUVLO
threshold in order to exit Ship Mode with MR
press. The EN_SHIPMODE bit can be cleared using the I
2
C interface as well while the VIN input is valid. The
EN_SHIPMODE bit is not cleared upon the I
2
C watchdog expiring, this means that if watchdog timer fault occurs
while the EN_SHIPMODE bit is set and the device is waiting to go into Ship Mode because V
IN
is present or MR
is low, the device will still proceed to go into Ship Mode once those conditions are cleared. The following list
shows the functions that are active during Ship Mode:
• VIN_UVLO Comparator
• MR Input
SLUSEC5 – DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
35
Product Folder Links:
Summary of Contents for BQ25157
Page 107: ...D Max E Max 2 045 mm Min 1 645 mm Min 1 985 mm 1 585 mm...
Page 108: ......
Page 109: ......
