LP3936SLX/NOPB National Semiconductor, LP3936SLX/NOPB Datasheet - Page 20

• Manufacturer Part Number: LP3936SLX/NOPB
• Description: IC LED DRVR WT/RGB BCKLGT 32TCSP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Backlight, White LED, RGB (I²C Interface)r

Specifications of LP3936SLX/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 9
• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch, LED Blinker, Light Management Unit (LMU)
• Type - Secondary: RGB, White LED
• Frequency: 1MHz
• Voltage - Supply: 3 V ~ 6 V
• Voltage - Output: 5.3V
• Mounting Type: Surface Mount
• Package / Case: 32-Laminate TCSP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 120mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP3936SLX

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ADDR
0AH
0BH
0CH
0DH
2AH
2BH
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
Recommended External Components
Symbol
RGB
R
R
LEDs
Note 16: Resistor RT tolerance change will change the timing accuracy of the RGB block. Also the boost converter switching frequency will be affected.
Control Registers
All user accessible control registers and register bits are shown in the following table.
Default value of each register is 0000 0000 except the following
Register 0Ch all bits (ain[7:0]) and bit D7 in register 0Bh (overflow) are read only. All other bits are read-write.
— 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)
R
B
, R
G
Amb. Light data
Control register rgb_pwm rgb_start
ext pwm enable
wled current 1
wled current 2
,
gslope, gduty
bslope, bduty
rslope, rduty
boost output
enables
SETUP
goff
boff
gon
bon
ron
roff
RGB LED
Current Limit Resistors
White LEDs
gslope[3] gslope[2] gslope[1]
bslope[3] bslope[2] bslope[1]
rslope[3] rslope[2] rslope[1]
wled1[7]
wled2[7]
overflow
boost[7]
ain[7]
D7
Symbol Explanation
List of Recommended External Components (Continued)
wled1[6]
wled2[6]
boost[6]
gon[6]
goff[6]
bon[6]
boff[6]
ron[6]
roff[6]
ain[6]
nstby
D6
en_boost
wled1[5]
wled2[5]
boost[5]
cycle[1]
gon[5]
goff[5]
bon[5]
boff[5]
ron[5]
roff[5]
ain[5]
D5
en_redpwm en_greenpwm en_bluepwm en_4ledpwm en_2ledpwm
gslope[0]
bslope[0]
rslope[0]
wled1[4]
en_flash
wled2[4]
boost[4]
cycle[0]
gon[4]
goff[4]
bon[4]
boff[4]
ron[4]
roff[4]
ain[4]
D4
20
(Continued)
en_ambave
wled1[3]
wled2[3]
gduty[3]
bduty[3]
boost[3]
rduty[3]
Value
gon[3]
goff[3]
bon[3]
boff[3]
ron[3]
roff[3]
ain[3]
rsw
D3
(See Application Note AN-1293 for resistor size
Unit
en_ambadc
wled1[2]
wled2[2]
gduty[2]
bduty[2]
boost[2]
rduty[2]
gon[2]
goff[2]
bon[2]
boff[2]
ron[2]
roff[2]
ain[2]
gsw
D2
User Defined
calculation)
wled1[1]
wled2[1]
gduty[1]
bduty[1]
en_4led
boost[1]
rduty[1]
gon[1]
goff[1]
bon[1]
boff[1]
ron[1]
roff[1]
ain[1]
bsw
D1
Type
pfm_mode
bduty[0]]
wled1[0]
wled2[0]
gduty[0]
en_2led
boost[0]
rduty[0]
gon[0]
goff[0]
bon[0]
boff[0]
ron[0]
roff[0]
ain[0]
D0