FAN54300 Datasheet, PDF (39/43 Pages) Fairchild Semiconductor – USB-Compliant, Dual-Power Input, Single-Cell, Li-Ion Switching Charger with USB-OTG Boost Regulator

Bit Name Type
Description
IBAT_V
Reg Addr: 4
Slave Addr: D4 Default = 0000 0001
7 RESETV
W
Writing a 1 resets all registers programmed with slave address D4, except the Safety register (Reg6),
to their defaults. Writing a 0 has no effect. Read returns 0.
Sets the maximum charge current (ICHARGE) when charging from VIN when IO_LEVELV = 0.
Table 24. ICHARGE Current as a Function of the ICHGV Bits and RSENSE Resistor Value
6:3 ICHGV
R/W
BIN
0000
HEX
00
V_RSENSE
(mV)
37.4
I_OCHARGE (mA)
68m 100m
550
374
0001 01 44.2
650
442
0010 02 51.0
750
510
0011 03 57.8
850
578
0100 04 64.6
950
646
0101 05 71.4 1,050 714
0110 06 78.2 1,150 782
0111 07 85.0 1,250 850
1000 08 91.8 1,350 918
1001 09 98.6 1,450 986
1010 0A 105.4 1,550 1,054
Any attempt to write a value higher than 1010 results in ICHGV = 1010.
Sets the current at which charging terminates if the TE bit is set:
2:0 ITERMV
R/W
Table 25. I_CHARGE Termination Current as a Function of the ITERM bits and R_SENSE
Resistor Value
BIN
000
HEX ^{VRSENSE ITERM (mA)}
(mV) 68m 100m
00 3.3
49
33
001 01 6.6
97
66
010 02 9.9 146 99
011 03 13.2 194 132
100 04 16.5 243 165
101 05 19.8 291 198
110 06 23.1 340 231
111 07 26.4 388 264
Bit Name Type
Description
SP_CHARGER_V
Reg Addr: 5
Slave Addr: D4 Default = 0x1x x100
7 Reserved R This bit returns 0.
6 VIN_CON R Mirror of INPUT_STATUS[7] (see INPUT_STATUS register description)
0: Output current is controlled by IOCHARGE bits for charging from VIN.
5 IO_LEVELV R/1W: When charging from VIN, the voltage across R_SENSE for output current control is set to 22.1mV
(325mA for RSENSE = 68m, 221mA for 100m).
4
SPV
0: Special charger loop is not active. VIN is able to stay above VSP. SPV = 0 when VIN is not PWM
R ^charging.
1: Special charger loop is active and controlling the charging current.
3 EN_LEVEL
R ^{0: DISABLE (DIS) pin is LOW.}
1: DISABLE (DIS) pin is HIGH
2:0 VSPV
R/W
Sets the special charger control loop reference voltage when charging from VIN. If VIN falls below
this voltage, battery current is reduced until the input voltage is at or above VSP (see Table 19).
© 2010 Fairchild Semiconductor Corporation
FAN54300 • Rev. 1.0.4
39
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