BQ25895_16 Datasheet, PDF (26/67 Pages) Texas Instruments – Adjustable Voltage 3.1-A Boost Operation

bq25895
SLUSC88A – MARCH 2015 – REVISED MAY 2016
PARAMETER
Battery Voltage (V_BAT)
System Voltage (V_SYS)
Temperature (TS) Voltage (V_TS)
VBUS Voltage (V_VBUS)
Charge Current (I_BAT)
Table 6. Battery Monitor Modes of Operation
REGISTER
REG0E
REG0F
REG10
REG11
REG12
CHARGE
MODE
Yes
Yes
Yes
Yes
Yes
MODES OF OPERATION
BOOST MODE
DISABLE CHARGE
MODE
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NA
NA
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BATTERY ONLY
MODE
Yes
Yes
Yes
NA
NA
8.2.9 Status Outputs (STAT, and INT)
8.2.9.1 Charging Status Indicator (STAT)
The device indicates charging state on the open drain STAT pin. The STAT pin can drive LED as shown in
Figure 47. The STAT pin function can be disable by setting STAT_DIS bit.
Table 7. STAT Pin State
CHARGING STATE
Charging in progress (including recharge)
Charging complete
Sleep mode, charge disable
Charge suspend (Input overvoltage, TS fault, timer fault, input or system overvoltage).
Boost Mode suspend (due to TS Fault)
STAT INDICATOR
LOW
HIGH
HIGH
blinking at 1 Hz
8.2.9.2 Interrupt to Host (INT)
In some applications, the host does not always monitor the charger operation. The INT notifies the system on the
device operation. The following events will generate 256-µs INT pulse.
• USB/adapter source identified (through PSEL or DPDM detection, with OTG pin)
• Good input source detected
– VBUS above battery (not in sleep)
– VBUS below V_ACOV threshold
– VBUS above V_VBUSMIN (typical 3.8 V) when I_BADSRC (typical 30 mA) current is applied (not a poor source)
• Input removed
• Charge Complete
• Any FAULT event in REG0C
When a fault occurs, the charger device sends out INT and keeps the fault state in REG0C until the host reads
the fault register. Before the host reads REG0C and all the faults are cleared, the charger device would not send
any INT upon new faults. To read the current fault status, the host has to read REG0C two times consecutively.
The 1^st read reports the pre-existing fault register status and the 2^nd read reports the current fault register status.
8.2.10 BATET (Q4) Control
8.2.10.1 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 configurated
by BATFET_DLY bit.
8.2.10.2 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
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