BQ24140_14 Datasheet, PDF (29/39 Pages) Texas Instruments – Integrated Dual-Input Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

bq24140
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SLUSAO5 – OCTOBER 2011
Safety Limit Register (READ/WRITE, Write only once after reset!)
Memory location: 06, Reset state: 01000000
BIT
NAME
Read/Write FUNCTION
B7(MSB) V_MCHRG3
Read/Write
Maximum charge current sense voltage: 54.4 mV (default 0)
B6
V_MCHRG2
Read/Write
Maximum charge current sense voltage: 27.2 mV (default 1)
B5
V_MCHRG1
Read/Write
Maximum charge current sense voltage: 13.6 mV (default 0)
B4
V_MCHRG0
Read/Write
Maximum charge current sense voltage: 6.8 mV (default 0)
B3
V_MREG3
Read/Write
Maximum battery regulation voltage: 160 mV (default 0)
B2
V_MREG2
Read/Write
Maximum battery regulation voltage: 80 mV (default 0)
B1
V_MREG1
Read/Write
Maximum battery regulation voltage: 40 mV (default 0)
B0(LSB)
V_MREG0
Read/Write
Maximum battery regulation voltage: 20 mV (default 0)
• Maximum charge current sense voltage offset is 550mA (default at 950mA) and the maximum charge current
option is 1.55A, if 68-mΩ sensing resistor is used.
• Maximum battery regulation voltage offset is 4.2V (default at 4.2V) and maximum battery regulation voltage
option is 4.44V.
• Memory location 06 resets only when VBAT voltage drops below V_SHORT threshold (typ.2.05V) or SLRST (pin
C3) goes to logic ‘0’. After reset, the maximum values for battery regulation voltage and charge current can
be programmed many times until any writing to other register locks the safety limits. Programmed values
exclude higher values from memory locations 02 (battery regulation voltage), and from memory location 04
(Fast charge current).
If host accesses (write command) to some other register before safety limit register, the default values hold!
LED Configuration Register
Memory location: 07, Reset state: 10000010
BIT
B7(MSB)
B6
NAME
ILED1
ILED0
B5
NA
B4
LED_CTRL
B3
t_LED_ON1
B2
t_LED_ON0
B1
B0(LSB)
t_LED_OFF1
t_LED_OFF0
Read/Write
Read/Write
Read/Write
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
FUNCTION
00 – LED Off
01 – LED current 1.25 mA
10 – LED current 2.5 mA (default)
11 – LED current mA
Returns 0
0 – LED On when charging is Active (default)
1 – LED On regardless of charging status
00 – LED On time 13 ms (default)
01 – LED On time 260 ms
10 – LED On time 520 ms
11 – LED Constant On
00 – LED Off time 390 ms
01 – LED Off time 780 ms
10 – LED Off time 1560 ms (default)
11 – LED Off time 3120 ms
Copyright © 2011, Texas Instruments Incorporated
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