LP3943 Datasheet, PDF (12/21 Pages) National Semiconductor (TI) – RGB/White/Blue 16-LED Fun Light Driver

LP3943
SNVS256A – MAY 2004 – REVISED MAY 2004
Bit #
7
Default value
1
Table 9. Address 0x05 (PWM1)
6
5
4
3
2
0
0
0
0
0
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1
0
0
0
BINARY FORMAT FOR SELECTOR REGISTERS — ADDRESS 0x06 to 0x09
Bit #
Default value
7
6
0
0
B1
B0
LED3
Table 10. 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
Table 11. 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
Table 12. 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
Table 13. Address 0x09 (LS3)
5
4
0
0
B1
B0
LED14
3
2
0
0
B1
B0
LED13
1
0
0
0
B1
B0
LED12
Table 14. 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)
Programming Example:
Dim LEDs 0 to 7 at 1 Hz at 25% duty cycle
Dim LEDs 8 to 12 at 5 Hz at 50% duty cycle
Set LEDs 13, 14 and 15 off
Step 1: Set PSC0 to achieve DIM0 of 1s
Step 2: Set PWM0 duty cycle to 25%
Step 3: Set PSC1 to achieve DIM1 of 0.2s
12
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