BQ24257 Datasheet, PDF (28/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
REGISTER MAPPING AND DESCRIPTION
Register #1
Memory location: 00, Reset state: x0xx xxxx
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BIT
NAME
Read/Write
FUNCTION
B7(MSB)
WD_FAULT
Read only
Read: 0 – No fault
1 – WD timeout if WD enabled
B6
WD_EN
Read/Write
0 – Disable
1 – Enable (also resets WC timer)
B5
STAT_1
Read only 00 – Ready
01 – Charge in progress
B4
STAT_0
Read only ^{10 – Charge done}
11 – Fault
B3
FAULT_3
B2
FAULT_2
B1
FAULT_1
B0(LSB)
FAULT_0
Read only
Read only
Read only
Read only
0000 – Normal
0001 – Input OVP
0010 – Input UVLO
0011 – Sleep
0100 – Battery Temperature (TS) Fault
0101 – Battery OVP
0110 – Thermal Shutdown
0111 – Timer Fault
1000 – No Battery connected
1001 – ISET short
1010 – Input Fault & LDO Low
• WD_FAULT – ‘0’ indicates no watch dog fault has occurred, where a ‘1’ indicates a fault has previously
occurred.
• WD_EN – Enables or disables the internal watch dog timer. A ‘1’ enables the watch dog timer and a ‘0’
disables it.
• STAT – Indicates the charge controller status
• FAULT – Indicates the faults that have occurred. If multiple faults occurred, they can be read by sequentially
addressing this register (e.g. reading the register 2 or more times). Once all faults have been read and the
device is in a non-fault state, the fault register will show “Normal”. Regarding the "Input Fault & LDO Low" ,
the IC will indicates this fault if the LDO is low and at the same time the input is below UVLO or coming out of
UVLO with LDO still low.
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