LP3958 Datasheet, PDF (27/36 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

LP3958
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WLED CONTROL (03H) – WLED CONTROL REGISTER
D7
R-0
D6
R-0
D5
SLOPE
RW - 0
D4
FADE_SEL
RW - 0
D3
EN_FADE
RW - 0
SNVS423C – JANUARY 2006 – REVISED MARCH 2013
D2
DISPL
RW - 0
D1
EN_MAIN
RW - 0
D0
EN_SUB
RW - 0
SLOPE
FADE_SEL
EN_FADE
DISPL
EN_MAIN
EN_SUB
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 – fade execution time 0.65 sec (full scale)
1 – fade execution time 1.3 sec (full scale)
0 – fade control for MAIN
1 – fade control for SUB
0 – automatic fade disabled
1 – automatic fade enabled
0 - MAIN and SUB individual control
1 - MAIN and SUB controlled with MAIN DAC
0 – MAIN output disabled
1 – MAIN output enabled
0 – SUB output disabled
1 – SUB output enabled
MAIN CURRENT (04H) – MAIN CURRENT CONTROL REGISTER
D7
RW - 0
D6
RW - 0
D5
RW - 0
D4
D3
MAIN[7:0]
RW - 0
RW - 0
D2
RW - 0
SUB CURRENT (05H) – SUB CURRENT CONTROL REGISTER
D7
RW - 0
D6
RW - 0
D5
RW - 0
D4
D3
SUB[7:0]
RW - 0
RW - 0
D2
RW - 0
D1
RW - 0
D1
RW - 0
D0
RW - 0
D0
RW - 0
MAIN, SUB current adjustment
MAIN[7:0], SUB[7:0]
Typical driver current (mA)
0000 0000
0
0000 0001
0.1
0000 0010
0.2
0000 0011
0.3
0000 0100
0.4
…
…
1111 1101
25.3
1111 1110
25.4
1111 1111
25.5
GPIO CONTROL (06H) – GPIO CONTROL REGISTER
D7
R-0
D6
R-0
D5
R-0
D4
EN_PWM_PIN
RW - 0
D3
R-0
D2
RW - 0
D1
OEN[2:0]
RW - 0
D0
RW - 0
EN_PWM_PIN
OEN[2:0]
Bit 4
Bits 2-0
0 – External PWM pin disabled
1 – External PWM pin enabled
0 – GPIO pin set as a input
1 – GPIO pin set as a output
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