LP3954 Datasheet, PDF (46/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
wled1_4[7:0]
Bits 7-0
wled1_4[7:0]
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
…
1111 1101
1111 1110
1111 1111
Adjustment
Typical driver current (ma)
0
0.1
0.2
0.3
0.4
…
25.3
25.4
25.5
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WLED5-6 (0AH) – WLED5, WLED6 BRIGHTNESS CONTROL REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
wled5_5[7:0]
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
rw-0
wled5_6[7:0]
Bits 7-0
wled5_6[7:0]
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
…
1111 1101
1111 1110
1111 1111
ENABLES (0BH) – ENABLES REGISTER
D7
D6
D5
D4
pwm_sync
nstby
en_boost
rw-0
rw-0
rw-0
r-0
Adjustment
Typical driver current (ma)
0
0.1
0.2
0.3
0.4
…
25.3
25.4
25.5
D3
D2
D1
D0
en_autoload
rgb_sel[1:0]
r-0
rw-1
rw-0
rw-0
pwm_sync
nstby
en_boost
en_autoload
rgb_sel[1:0]
Bit 7
Bit 6
Bit 5
Bit 2
Bits 1-0
0 – synchronization to external clock disabled
1 – synchronization to external clock enabled
0 – LP3954 standby mode
1 – LP3954 active mode
0 – boost converter disabled
1 – boost converter enabled
0 – internal boost converter active load off
1 – internal boost converter active load on
Color LED control mode selection
rgb_sel[1:0]
Audio sync connected
to
Pattern generator
connected to
00
none
RGB1 & RGB2
01
RGB1
RGB2
10
RGB2
RGB1
11
RGB1 & RGB2
none
46
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