LP3954 Datasheet, PDF (42/56 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954 Registers
REGISTER BIT EXPLANATIONS
Each register is shown with a key indicating the accessibility of the each individual bit, and the initial condition:
Register Bit Accessibility and Initial Condition
Key
Bit Accessibility
rw
Read/write
r
Read only
–0,–1
Condition after POR
RGB CTRL (00H) – RGB LEDS CONTROL REGISTER
D7
cc_rgb1
rw-1
D6
cc_rgb2
rw-1
D5
r1sw
rw-0
D4
g1sw
rw-0
D3
b1sw
rw-0
D2
r2sw
rw-0
D1
g2sw
rw-0
D0
b2sw
rw-0
cc_rgb1
cc_rgb2
r1sw
g1sw
b1sw
r2sw
g2sw
b2sw
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 - R1, G1 and B1 are constant current sinks, current limited internally
1 - R1, G1 and B1 are switches, limit current with external ballast resistor
0 – R2, G2 and B2 are constant current sinks, current limited internally
1 – R2, G2 and B2 are switches, limit current with external ballast resistor
0 – R1 disabled
1 – R1 enabled
0 – G1 disabled
1 – G1 enabled
0 – B1 disabled
1 – B1 enabled
0 – R2 disabled
1 – R2 enabled
0 – G2 disabled
1 – G2 enabled
0 – B2 disabled
1 – B2 enabled
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