LP3943 Datasheet, PDF (10/13 Pages) National Semiconductor (TI) – RGB/White/Blue 16-LED Fun Light Driver

Application Notes (Continued)
Address 0x05 (PWM1)
Bit #
7
6
5
4
3
2
1
0
Default value
1
0
0
0
0
0
0
0
PWM1 register determines the duty cycle of DIM1. The LED outputs are LOW (LED on) when the count is less than the value in PWM1 and HIGH (LED off) when
it is greater. If PWM1 is programmed with 0x00, LED output is always HIGH (LED off).
The duty cycle of DIM1 is: PWM1/256
Default value is 50% duty cycle.
BINARY FORMAT FOR SELECTOR REGISTERS — ADDRESS 0x06 to 0x09
Bit #
Default value
7
6
0
0
B1
B0
LED3
Address 0x06 (LS0)
5
4
0
0
B1
B0
LED2
3
2
0
0
B1
B0
LED1
1
0
0
0
B1
B0
LED0
Bit #
Default value
7
6
0
0
B1
B0
LED7
Address 0x07 (LS1)
5
4
0
0
B1
B0
LED6
3
2
0
0
B1
B0
LED5
1
0
0
0
B1
B0
LED4
Bit #
Default value
7
6
0
0
B1
B0
LED11
Address 0x08 (LS2)
5
4
0
0
B1
B0
LED10
3
2
0
0
B1
B0
LED9
1
0
0
0
B1
B0
LED8
Bit #
Default value
7
6
0
0
B1
B0
LED15
Address 0x09 (LS3)
5
4
0
0
B1
B0
LED14
3
2
0
0
B1
B0
LED13
1
0
0
0
B1
B0
LED12
LED States With Respect To Values in "B1" and "B0"
B1
B0
Function
0
0
Output Hi-Z
(LED off)
0
1
Output LOW
(LED on)
1
0
Output dims
(DIM0 rate)
1
1
Output dims
(DIM1 rate)
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