bq24160, bq24161
bq24163, bq24168
SLUSAO0A –NOVEMBER 2011–REVISED MARCH 2012
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Safety Timer/ NTC Monitor Register (READ/WRITE)
Memory location: 07, Reset state: 1001 1xxx
BIT
NAME
Read/Write
FUNCTION
B7 (MSB)
2XTMR_EN
Read/Write
1 – Timer slowed by 2x when in thermal regulation, input current limit, VIN_DPM or
DPPM
0 – Timer not slowed at any time (default 0) (bq24160/1 only)
B6
B5
TMR_1
TMR_2
Read/Write
Read/Write
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) (bq24160/1 only)
B4
B3
NA
Read/Write
Read/Write
NA
TS_EN
0 – TS function disabled
1 – TS function enabled (default 1)
B2
B1
TS_FAULT1
TS_FAULT0
Read only
Read only
TS Fault Mode:
00 – Normal, No TS fault
01 – TS temp < TCOLD or TS temp > THOT(Charging suspended)
10 – TCOOL > TS temp > TCOLD (Charge current reduced by half, bq24160 only)
11 – TWARM < TS temp < THOT (Charge voltage reduced by 140mV, bq24160 only)
B0 (LSB)
LOW_CHG
Read/ Write
0 – Charge current as programmed in Register 0x05
1 – Charge current is half programmed value in Register 0x05
(default 0)
2xTMR_EN Bit (2x Timer Enable)
The 2xTMR_EN bit is used to slow down the timer when charge current is reduced by the system load.
When 2xTMR_EN is a "1", the safety timer is slowed to half speed effectively doubling the timer time.
The conditions that activate the 2x timer are: Input Current Limit, VINDPM, Thermal Regulation,
LOW_CHG, BATSHRT and TS Cool. When 2xTMR_EN is a "0", the timer operates at normal speed in
all conditions.
LOW_CHG Bit (Low Charge Mode Enable)
The LOW_CHG bit is used to reduce the charge current from 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 (bq24160/1/3/8). Write a “0” to this bit to charge
at the programmed charge current.
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