BQ25601 Datasheet, PDF (26/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
SLUSCK5 – MARCH 2017
8.4.8 Shipping Mode and QON Pin
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8.4.8.1 BATFET Disable Mode (Shipping Mode)
To extend battery life and minimize power when system is powered off during system idle, shipping, or storage,
the device can turn off BATFET so that the system voltage is zero to minimize the battery leakage current. When
the host set BATFET_DIS bit, the charger can turn off BATFET immediately or delay by t_{SM_DLY} as configured by
BATFET_DLY bit.
8.4.8.2 BATFET Enable (Exit Shipping Mode)
When the BATFET is disabled (in shipping mode) and indicated by setting BATFET_DIS, one of the following
events can enable BATFET to restore system power:
1. Plug in adapter
2. Clear BATFET_DIS bit
3. Set REG_RST bit to reset all registers including BATFET_DIS bit to default (0)
4. A logic high to low transition on QON pin with t_SHIPMODE deglitch time to enable BATFET to exit shipping
mode
8.4.8.3 BATFET Full System Reset
The BATFET functions as a load switch between battery and system when input source is not plugged-in. By
changing the state of BATFET from on to off, systems connected to SYS can be effectively forced to have a
power-on-reset. The QON pin supports push-button interface to reset system power without host by changing the
state of BATFET.
When the QON pin is driven to logic low for t_{QON_RST} while input source is not plugged in and BATFET is enabled
(BATFET_DIS = 0), the BATFET is turned off for t_{BATFET_RST} and then it is re-enabled to reset system power. This
function can be disabled by setting BATFET_RST_EN bit to 0.
8.4.8.4 QON Pin Operations
The QON pin incorporates two functions to control BATFET.
1. BATFET Enable: A QON logic transition from high to low with longer than t_SHIPMODE deglitch turns on
BATFET and exit shipping mode
2. BATFET Reset: When QON is driven to logic low by at least t_{QON_RST} while adapter is not plugged in (and
BATFET_DIS = 0), the BATFET is turned off for t_{BATFET_RST}. The BATFET is re-enabled after t_{BATFET_RST}
duration. This function allows systems connected to SYS to have power-on-reset. This function can be
disabled by setting BATFET_RST_EN bit to 0.
Figure 18 shows the sample external configurations for each.
QON
Q4 Status
Press
push button
t_SHIPMODE
Press
push button
t_{QON_RST}
t_{BATFET_RST}
Q4 off due to I²C or
system overload
Turn on Q4 FET
when BATFET_DIS = 1 or SLEEPZ = 1
Q4 on
Q4
off
Q4 on
Reset Q4 FET
When BATFET_DIS = 0 and SLEEPZ = 0
Figure 18. QON Timing
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