LP3950 Datasheet, PDF (3/31 Pages) National Semiconductor (TI) – Color LED Driver with Audio Synchronizer

Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Name
FB
GND_BOOST
SW
V_DD2
GND2
DME
AMODE
V_DDA
ASE
AD1
AD2
GNDA
RT
V_DD1
GND1
V_REF
GND3
NRST
SS/SDA
SO
SI
SCK/SCL
PWM_LED
V_DDIO
IF_SEL
B2
G2
R2
GND_RGB
R1
G1
B1
Type
Input
Ground
Output
Power
Ground
Logic Input
Logic Input
Power
Input
Input
Input
Ground
Input
Power
Ground
Output
Ground
Logic Input
Logic I/O
Logic Output
Logic Input
Logic Input
Logic Input
Power
Logic Input
Output
Output
Output
Ground
Output
Output
Output
Description
Boost converter feedback.
Power switch ground.
Open drain, boost converter power switch.
Supply voltage for internal digital circuits.
Ground return for V_DD2 (internal digital).
Default mode enable (internal pull down 1 MΩ).
Audio mode selection (internal pull down 1 MΩ).
Supply voltage for audio circuits.
Analog audio input, single-ended.
Analog audio input, differential.
Analog audio input, differential.
Ground for analog audio inputs.
Oscillator resistor.
Supply voltage for internal analog circuits.
Ground.
Internal reference bypass capacitor.
Ground.
Low active reset input.
SPI slave select/ I²C data line.
SPI serial data output.
SPI serial data input.
SPI/ I²C clock.
Direct PWM control for LEDs.
Supply voltage for logic IO signals.
SPI/I²C select (IF_SEL = 1 in SPI mode).
Open drain output, blue LED2.
Open drain output, green LED2.
Open drain output, red LED2.
RGB driver ground.
Open drain output, red LED1.
Open drain output, green LED1.
Open drain output, blue LED1.
3
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