BQ24292I Datasheet, PDF (19/42 Pages) Texas Instruments – I2C Controlled 4.5A Single Cell USB/Adapter Charger With Narrow VDC Power Path Management and USB OTG

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bq24292i
SLUSBI4 – APRIL 2013
Fault Register REG09
BIT
Bit 7
WATCHDOG_FAULT
Bit 6
BOOST_FAULT
Bit 5
CHRG_FAULT[1]
Bit 4
CHRG_FAULT[0]
Bit 3
Bit 2
Bit 1
Bit 0
BAT_FAULT
NTC_FAULT[2]
NTC_FAULT[1]
NTC_FAULT[0]
DESCRIPTION
0 – Normal, 1- Watchdog timer expiration
0 – Normal, 1 – VBUS overloaded (OCP), or VBUS OVP in boost mode
00 – Normal, 01 – Input fault (VBUS OVP or VBAT<VBUS<3.8V), 10 - Thermal shutdown,
11 – Charge Safety Timer Expiration
Note: a one time Input fault is generated when VBUS source is removed
0 – Normal, 1 – BATOVP
000 – Normal, 001 – TS1 Cold, 010 – TS1 Hot, 011 – TS2 Cold,
100 – TS2 Hot, 101 – Both Cold, 110 – Both Hot
Vender / Part / Revision Status Register REG0A
BIT
DESCRIPTION
Bit 7
Reserved
0 - Reserved
Bit 6
Reserved
0 - Reserved
Device Configuration
Bit 5
PN[2]
011
Bit 4
PN[1]
Bit 3
PN[0]
Bit 2
TS_PROFILE
0 – Cold/Hot window
Bit 1
DEV_REG[0]
00
Bit 0
DEV_REG[1]
DETAILED DESCRIPTION
The bq24292i is an I²C controlled power path management device and a single cell Li-Ion battery charger. It
integrates the input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side
switching FET (LSFET, Q3), and BATFET (Q4) between system and battery. The device also integrates the
bootstrap diode for the high-side gate drive.
Device Power Up
Power-On-Reset (POR)
The internal bias circuits are powered from the higher voltage of VBUS and BAT. When VBUS or VBAT rises
above UVLOZ, the sleep comparator, battery depletion comparator and BATFET driver are active. I²C interface
is ready for communication and all the registers are reset to default value. The host can access all the registers
after POR.
Power Up from Battery without DC Source
If only battery is present and the voltage is above depletion threshold (V_{BAT_DEPL}), the BATFET turns on and
connects battery to system. The REGN LDO stays off to minimize the quiescent current. The low R_DSON in
BATFET and the low quiescent current on BAT minimize the conduction loss and maximize the battery run time.
The device always monitors the discharge current through BATFET. When the system is overloaded or shorted,
the device will immediately turn off BATFET and keep BATFET off until the input source plugs in again.
BATFET Turn Off
The BATFET can be forced off by the host through I²C REG07[5]. This bit allows the user to independently turn
off the BATFET when the battery condition becomes abnormal during charging. When BATFET is off, there is no
path to charge or discharge the battery.
When battery is not attached, the BATFET should be turned off by setting REG07[5] to 1 to disable charging and
supplement mode.
Copyright © 2013, Texas Instruments Incorporated
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