LP3954 Datasheet, PDF (4/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
Pin No.
6F
6E
6D
6C
6B
6A
5F
5E
5D
5C
5B
5A
4F
4E
4D
4C
4B
4A
3F
3E
3D
3C
3B
3A
2F
2E
2D
2C
2B
2A
1F
1E
1D
1C
1B
1A
Name
SW
FB
FLASH
R1
G1
B1
GND_SW
GND
VDDIO
SS/SDA
IRGB
GND_RGB
GND_WLED
IFLASH
SYNC_PWM
SI
SO
R2
WLED5
WLED6
VDD1
EN_FLASH
SCK/SCL
G2
WLED3
WLED4
ASE
IRT
IF_SEL
B2
WLED1
WLED2
GNDA
VREF
VDDA
VDD2
Table 1. Pin Descriptions
Type
Output
Input
Output
Output
Output
Output
Ground
Ground
Power
Logic Input/Output
Input
Ground
Ground
Input
Logic Input
Logic Input
Logic Output
Output
Output
Output
Power
Logic Input
Logic Input
Output
Output
Output
Input
Input
Logic Input
Output
Output
Output
Ground
Output
Power
Power
Description
Boost Converter Power Switch
Boost Converter Feedback
High Current Flash Output
Red LED 1 Output
Green LED 1 Output
Blue LED 1 Output
Power Switch Ground
Ground
Supply Voltage for Input/output Buffers and Drivers
Slave Select (SPI), Serial Data In/Out (I²C)
Bias Current Set Resistor for RGB Drivers
Ground for RGB Currents
Ground for WLED Currents
High Current Flash Current Set Resistor
External PWM Control for LEDs or External Clock for RGB Sync
Serial Input (SPI), Address Select (I²C)
Serial Data Out (SPI)
Red LED 2 output
White LED 5 output
White LED 6 output
Supply voltage
Enable for High Current Flash
Clock (SPI/I²C)
Green LED 2 Output
White LED 3 output
White LED 4 output
Audio Synchronization Input
Oscillator Frequency Resistor
Interface (SPI or I²C compatible) Selection (IF_SEL = 1 for SPI)
Blue LED 2 Output
White LED 1 Output
White LED 2 Output
Ground for Analog Circuitry
Reference Voltage
Internal LDO Output
Supply Voltage
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