LP3933 datasheet(3/18 Pages) NSC

Part #	LP3933

Description	Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs

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Manufacturer	NSC [National Semiconductor (TI)]

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Pin Description

Pin #

Name

Type

Description

1

FB

Input

Boost Converter Feedback

2

GND_BOOST

Ground

Power Switch Ground

3

SW

Output

Open Drain, Boost Converter Power Switch

4V

DD2

Power

Supply Voltage for Internal Digital Circuits

5

GND2

Ground

Ground Return for V

DD2 (Internal Digital)

6

CLED1

Output

Open Drain, CLED1 Output

7

CLED2

Output

Open Drain, CLED2 Output

8

GND_WLED

Ground

Ground for WLED and CLED Drivers

9

WLED1

Output

Open Drain, White LED1 Output

10

WLED2

Output

Open Drain, White LED2 Output

11

WLED3

Output

Open Drain, White LED3 Output

12

WLED4

Output

Open Drain, White LED4 Output

13

RT

Input

Oscillator Resistor

14

V

DD1

Power

Supply Voltage for Internal Analog Circuits

15

GND1

Ground

16

V

REF

Output

Internal Reference Bypass Capacitor

17

GND3

Ground

18

NRST

Logic Input

Low Active Reset Input

19

SS

Logic Input

SPI Slave Select

20

SO

Logic Output

SPI Serial Data Output

21

SI

Logic Input

SPI Serial Data Input

22

SCK

Logic Input

SPI Clock

23

PWM_LED

Logic Input

LED Control for On/Off or Dimming Control

24

V

DD_IO

Power

Supply Voltage for Logic IO Signals

25

GND4

Ground

26

B2

Output

Open Drain Output, Blue LED 2

27

G2

Output

Open Drain Output, Green LED 2

28

R2

Output

Open Drain Output, Red LED 2

29

GND_RGB

Ground

RGB Driver Ground

30

R1

Output

Open Drain Output, Red LED 1

31

G1

Output

Open Drain Output, Green LED 1

32

B1

Output

Open Drain Output, Blue LED 1

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LP3933 Datasheet(PDF) 3 Page - National Semiconductor (TI)

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