FAN54300 Datasheet, PDF (40/43 Pages) Fairchild Semiconductor – USB-Compliant, Dual-Power Input, Single-Cell, Li-Ion Switching Charger with USB-OTG Boost Regulator

Bit Name
SAFE_V
7:4 ISAFEV
3:0 VSAFEV
Type
Description
Reg Addr: 6
Slave Addr: D4 Default = 0100 0000
Any attempt to write a value to ICHGV higher than the contents of ISAFEV sets ICHGV = ISAFEV.
Any attempt to write a value higher than 1010 to ISAFEV results in ISAFEV = 1010.
R/W
Table 26. I_CHARGE Limit as a Function of the ISAFEV Bits when Charging from VIN
BIN
HEX ^VRSENSE
I_SAFE (mA)
(mV) 68m 100m
0000 00 37.4
550
374
0001 01 44.2
650
442
0010 02 51.0
750
510
0011
0100
0101
0110
0111
1000
1001
1010
03 57.8
850
578
04 64.6
950
646
05 71.4 1,050 714
06 78.2 1,150 782
07 85.0 1,250 850
08 91.8 1,350 918
09 98.6 1,450 986
0A 105.4 1,550 1,054
R/W
Any attempt to write a value to OREGV that is higher than the value in the Max OREG column
below results in OREGV = Max OREG (see Table 21).
Bit Name Type
Description
LED_CONTROL
Reg Addr: 7
Slave Addr: D4 or D6
Sets LED behavior
Table 27. LED Control Bits
7:6 I_LED
00 LED is off
R/W
01 LED current = 1.13 mA
10 LED current = 2.25mA
11 LED current = 4.50 mA
5 Reserved R This bit returns 0.
0: LED is only active when charging.
4 LED_ON R/W _{1: LED is active regardless of charging status.}
Sets LED blink tON
Table 28. LED ON-Time
00 131 ms
3:2 LED_TON R/W
01 262 ms
10 524 ms
11 Constant ON
Sets LED blink tOFF
Table 29. LED OFF-Time
00 393 ms
1:0 LED_TOFF R/W
01 786 ms
10 1573 ms
11 3146 ms
Default = 1000 0010
© 2010 Fairchild Semiconductor Corporation
FAN54300 • Rev. 1.0.4
40
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