BQ24297 Datasheet, PDF (6/48 Pages) Texas Instruments – I2C Controlled 3A Single Cell USB Charger

bq24296
bq24297
SLUSBP6A – SEPTEMBER 2013 – REVISED OCTOBER 2013
PINOUTS
www.ti.com
24 23 22 21 20 19
VBUS 1
PSEL 2
PG 3
STAT 4
SCL 5
SDA 6
bq24296
18 PGND
17 PGND
16 SYS
15 SYS
14 BAT
13 BAT
7 8 9 10 11 12
24 23 22 21 20 19
VBUS 1
D+ 2
D– 3
STAT 4
SCL 5
SDA 6
bq24297
18 PGND
17 PGND
16 SYS
15 SYS
14 BAT
13 BAT
7 8 9 10 11 12
PIN
NAME
VBUS
D+
(bq24297)
PSEL
(bq24296)
D–
(bq24297)
PG
(bq24296)
STAT
SCL
SDA
INT
OTG
CE
ILIM
TS
QON
PIN FUNCTIONS
TYPE
NO.
DESCRIPTION
1,24
P Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between VBUS and PMID
with VBUS on source. Place a 1µF ceramic capacitor from VBUS to PGND and place it as close as possible to IC.
2
I Positive line of the USB data line pair. D+/D– based USB host/charging port detection. The detection includes data
Analog ^{contact detection (DCD), primary detection in bc1.2, and non-standard adapters.}
2
I Power source selection input. High indicates a USB host source and Low indicates an adapter source.
3
I Negative line of the USB data line pair. D+/D– based USB host/charging port detection. The detection includes data
Analog ^{contact detection (DCD), primary detection in bc1.2, and non-standard adapters.}
3
O Open drain active low power good indicator. Connect to the pull up rail via 10kohm resistor. LOW indicates a good input
source if the input voltage is between UVLO and ACOV, above SLEEP mode threshold, and current limit is above 30mA.
4
O Open drain charge status output to indicate various charger operation. Connect to the pull up rail via 10kohm. LOW
indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault condition occurs, STAT
pin in the charge blinks at 1Hz.
5
I
I²C Interface clock. Connect SCL to the logic rail through a 10kΩ resistor.
6
I/O I²C Interface data. Connect SDA to the logic rail through a 10kΩ resistor.
7
O Open-drain Interrupt Output. Connect the INT to a logic rail via 10kΩ resistor. The INT pin sends active low, 256us pulse
to host to report charger device status and fault.
8
I USB current limit selection pin during buck mode, and active high enable pin during boost mode.
Digital _{For bq24296, when in buck mode with USB host (PSEL=High), when OTG = High, IIN limit = 500mA and when OTG =}
Low, IIN limit = 100mA.
For bq24297, when in buck mode with USB host, when OTG = High, IIN limit = 500mA and when OTG = Low, IIN limit =
100mA.
The boost mode is activated when the REG01[4]=1 and OTG pin is High.
9
I Active low Charge Enable pin. Battery charging is enabled when REG01[5:4]=01 and CE pin = Low. CE pin must be
pulled high or low.
10
I ILIM pin sets the maximum input current limit by regulating the ILIM voltage at 1V. A resistor is connected from ILIM pin to
ground to set the maximum limit as I_INMAX = (1V/R_ILIM) × K_ILIM. The actual input current limit is the lower one set by ILIM
and by I²C REG00[2:0]. The minimum input current programmed on ILIM pin is 500mA.
11
I Temperature qualification voltage input #1. Connect a negative temperature coefficient thermistor. Program temperature
Analog ^{window with a resistor divider from REGN to TS1 to GND. Charge suspends or Boost disable disable when TS pin is out}
of range. Recommend 103AT-2 thermistor.
12
I BATFET enable control in shipping mode. A logic low to high transition on this pin with minimum 2ms high level turns on
BATFET to exit shipping mode. It has internal 1MΩ (typ.) pull down. For backward compatibility, when BATFET enable
control function is not used, the pin can be no connect or tied to TS pin. (Please refer to Shipping Mode for detail
description).
6
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