BQ24273 Datasheet, PDF (20/27 Pages) Texas Instruments – 2.5A, Single Input, Single Cell Switchmode Li-Ion Battery Charger with Integrated Current Sense

bq24273
SLUSB08 – JUNE 2012
Safety Timer/ NTC Monitor Register (READ/WRITE)
Memory location: 07, Reset state: 1001 1xxx
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BIT
NAME
B7(MSB) 2XTMR_EN
B6
TMR_1
B5
TMR_2
B4
NA
B3
TS_EN
B2
TS_FAULT1
B1
TS_FAULT0
B0(LSB) LOW_CHG
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read Only
Read Only
Read/Write
FUNCTION
1 – Timer slowed by 2x when in thermal regulation, input current limit, V_{IN_DPM} or DPPM
0 – Timer not slowed at any time (default 0)
Safety Timer Time Limit
00 – 27 minute fast charge
01 – 6 hour fast charge
10 – 9 hour fast charge
11 – Disable safety timers (default 00)
NA
0 – TS function disabled
1 – TS function enabled (default 1)
TS Fault Mode:
00— Normal, No TS fault
01— TS temp < T_COLD or TS temp > T_HOT(Charging suspended)
10— T_COOL > TS temp > T_COLD (Charge current reduced by half, bq24273 only)
11— T_WARM < TS temp < T_HOT (Charge voltage reduced by 140mV, bq24273 only)
0 – Charge current as programmed in Register 0x05
1 – Charge current half programmed value in Register 0x05 (default 0)
LOW_CHG Bit (Low Charge Mode Enable)
The LOW_CHG bit is used to reduce the charge current to half of the programmed value. This feature is used by
systems where battery NTC is monitored by the host and requires a reduced charge current setting or by
systems that need a “preconditioning” current for low battery voltages. Write a “1” to this bit to charge at half of
the programmed charge current. Write a “0” to this bit to charge at the programmed charge current.
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