BQ24187 Datasheet, PDF (30/44 Pages) Texas Instruments – 1A USB-OTG Support

bq24187
SLUSBM0 – APRIL 2014
Not Recommended for New Designs
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Table 8. Safety Timer/ NTC Monitor Register (READ/WRITE)
Memory location: 06, Reset state: 1001 1xx0
BIT
B7 (MSB)
B6
NAME
2XTMR_EN
TMR_1
B5
TMR_2
B4
BOOST_ILIM
B3
TS_EN
B2
TS_FAULT1
B1
TS_FAULT0
B0 (LSB)
NA
READ/WRITE
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read only
Read only
Read/Write
FUNCTION
0 – Timer not slowed at any time
1 – Timer slowed by 2x when in thermal regulation, V_{IN_DPM} or DPPM (default 1)
Safety Timer Time Limit –
00—40 minute fast charge
01 – 6 hour fast charge
10 – 9 hour fast charge
11 – Disable safety timers (default 00) (bq24187/1 only)
0—500mA
1—750mA (Default 1)
0 – TS function disabled
1 – TS function enabled (default 1)
TS Fault Mode:
00— Normal, No TS fault
01— TS temp < TC_OLD or TS temp > T_HOT(Charging suspended)
10— T_COOL > TS temp > T_COLD (Charge current reduced by half)
11— T_WARM < TS temp < T_HOT (Charge voltage reduced by 100mV)
Always write to ‘0’
BOOST_ILIM Bit
.(Boost current
limit setting)
The BOOST_ILIM bit programs the cycle by cycle current limit threshold for boost
operation. The 1A setting sets the low side cycle by cycle current limit to 4A (typ).
This ensures that at least 1A can be supplied from the boost converter over the entire
battery range. The 500mA setting sets the current limit to 2A(typ) to ensure at least
500mA available from the boost converter. See the boost mode over-current section
for more details
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