BQ25120A Datasheet, PDF (18/67 Pages) Texas Instruments – Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT

bq25120A
SLUSD08 – MAY 2017
www.ti.com
9.3 Feature Description
9.3.1 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_BAT + V_SLP or the MR button is depressed for t_WAKE1 and released. The following list shows the events
that are active during Ship Mode:
1. VIN_UV Comparator
2. MR Input (No clock or delay in this mode for lowest power consumption)
3. PMID active pull down
9.3.1.1 Ship Mode Entry and Exit
The device may only enter Ship Mode when there is not a valid VIN supply present (V_IN < V_UVLO). Once the IN
supply is removed there are two ways for the device to enter Ship Mode: through I²C command using the
EN_SHIPMODE bit and by doing a long button press when MRREC bit is set to 0. If the EN_SHIPMODE bit is
set while the IN supply is present, the device will enter Ship Mode upon removal of the supply. The
EN_SHIPMODE bit can be cleared using the I²C interface as well while the IN input is valid.
In addition to V_IN < V_UVLO, CD and MR must be high. Once all of these conditions are met the device will begin
the transition to Ship Mode. All three conditions must remain unchanged for a period of t_QUIET to ensure proper
operation. Figure 15 and Figure 16show the correct sequencing to ensure proper entry into the Ship Mode
through I²C command and MR button press respectively.
t_QUIET
/CD
/MR
VIN
Shipmode
I2C
Write
xx xxxxxxxxxxxx
Figure 15. CD, MR and VIN Sequencing for Ship Mode Entry Through I²C Command
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