BQ24257 Datasheet, PDF (29/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

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Register #2
Memory location: 01, Reset state: 1010 1100
bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
BIT
NAME
Read/Write
FUNCTION
B7(MSB)
Reset
Write only
Write:
1 – Reset all registers to default values
0 – No effect
B6
I_{IN_ILIMIT_2}
Read/Write 000 – USB2.0 host with 100mA current limit
B5
I_{IN_ILIMIT_1}
Read/Write ^{001 – USB3.0 host with 150mA current limit}
010 – USB2.0 host with 500mA current limit
011 – USB3.0 host with 900mA current limit
100 – Charger with 1500mA current limit
B4
I_{IN_ILIMIT _0}
Read/Write _{101 – Charger with 2000mA current limit}
110 – External ILIM current limit(5)
111- No input current limit with internal clamp at 3A (PTM MODE)
B3
EN_STAT
Read/Write
0 – Disable STAT function
1 – Enable STAT function
B2
EN_TERM
Read/Write
0 – Disable charge termination
1 – Enable charge termination
B1
CE
Read/Write
0 – Charging is enabled
1 – Charging is disabled
B0(LSB)
HZ_MODE
Read/Write
0 – Not high impedance mode
1 – High impedance mode
• I_{IN_LIMIT} – Sets the input current limit level. When in host mode this register sets the regulation level. However,
when in standalone mode (e.g. no i2c writes have occurred after power up or the WD timer has expired) the
external resistor setting for IILIM sets the regulation level.
• EN_STAT – Enables and disables the STAT pin. When set to a ‘1’ the STAT pin is enabled and function
normally. When set to a ‘0’ the STAT pin is disabled and the open drain FET is in HiZ mode.
• EN_TERM – Enables and disables the termination function in the charge controller. When set to a ‘1’ the
termination function will be enabled. When set to a ‘0’ the termination function will be disabled. When
termination is disabled, there are no indications of the charger terminating (i.e. STAT pin or STAT registers).
• CE – The charge enable bit which enables or disables the charge function. When set to a ‘0’, the charger
operates normally. When set to a ‘1’, the charger is disables by turning off the BAT FET between SYS and
BAT. The SYS pin continues to stay active via the switch mode controller if an input is present.
• HZ_MODE – Sets the charger IC into low power standby mode. When set to a ‘1’, the switch mode controller
is disabled but the BAT FET remains ON to keep the system powered. When set to a ‘0’, the charger
operates normally.
Copyright © 2013, Texas Instruments Incorporated
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