LP3936 Datasheet, PDF (23/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
www.ti.com
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
Control Registers
All user accessible control registers and register bits are shown in the following table.
ADDR
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
2AH
2BH
SETUP
Control
register
ron
roff
gon
goff
bon
boff
rslope,
rduty
gslope,
gduty
bslope,
bduty
wled
current 1
enables
Amb. Light
data
boost
output
wled
current 2
ext pwm
enable
D7
rgb_pwm
rslope[3]
gslope[3]
bslope[3]
wled1[7]
overflow
ain[7]
boost[7]
wled2[7]
D6
rgb_start
ron[6]
roff[6]
gon[6]
goff[6]
bon[6]
boff[6]
rslope[2]
gslope[2]
bslope[2]
wled1[6]
nstby
ain[6]
boost[6]
wled2[6]
D5
D4
D3
D2
D1
D0
cycle[1]
cycle[0]
rsw
gsw
bsw
pfm_mode
ron[5]
roff[5]
gon[5]
goff[5]
bon[5]
boff[5]
rslope[1]
ron[4]
roff[4]
gon[4]
goff[4]
bon[4]
boff[4]
rslope[0]
ron[3]
roff[3]
gon[3]
goff[3]
bon[3]
boff[3]
rduty[3]
ron[2]
roff[2]
gon[2]
goff[2]
bon[2]
boff[2]
rduty[2]
ron[1]
roff[1]
gon[1]
goff[1]
bon[1]
boff[1]
rduty[1]
ron[0]
roff[0]
gon[0]
goff[0]
bon[0]
boff[0]
rduty[0]
gslope[1] gslope[0] gduty[3]
gduty[2]
gduty[1]
gduty[0]
bslope[1] bslope[0] bduty[3]
bduty[2]
bduty[1]
bduty[0]]
wled1[5] wled1[4] wled1[3] wled1[2] wled1[1] wled1[0]
en_boost
ain[5]
en_flash
ain[4]
en_ambave en_ambadc
ain[3]
ain[2]
en_4led
ain[1]
en_2led
ain[0]
boost[5]
boost[4]
boost[3]
boost[2]
boost[1]
boost[0]
wled2[5] wled2[4] wled2[3] wled2[2] wled2[1] wled2[0]
en_redpwm en_greenpw en_bluepw en_4ledpw en_2ledpw
m
m
m
m
Default value of each register is 0000 0000 except the following
— boost output default is 0000 0111 = 07h (4.55V).
— enables default is x010 0000 = 20h (boost enabled)
— ext_pwm_enable default is 0001 1100 = 1Ch (RGB_EN control enabled for color outputs)
Register 0Ch all bits (ain[7:0]) and bit D7 in register 0Bh (overflow) are read only. All other bits are read-write.
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