LP3942YQ NSC [National Semiconductor], LP3942YQ Datasheet - Page 3

• Manufacturer Part Number: LP3942YQ
• Description: The Dual RGB LED Controller with 1.5x/2x Charge Pump and SPI Interface
• Manufacturer: NSC [National Semiconductor]

Pin Description
Pin #
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
Name
GND3
GND1
GND2
NRST
P
SCK
I
C1P
C2N
C1N
C2P
V
BIAS
SS
G1
G2
V
R1
B1
B2
R2
SI
OUT
I
I
I
DD
R
G
B
IN
Logic Input
Logic Input
Logic Input
Logic Input
Ground
Ground
Ground
Output
Output
Output
Output
Output
Output
Output
Power
Power
Type
Input
Input
Input
Input
SPI Slave Select
SPI Serial Data
SPI Clock
Open Drain, Red LED (1)
Open Drain, Green LED (1)
Open Drain, Blue LED (1)
Ground 3
Open Drain, Blue LED (2)
Open Drain, Green LED (2)
Open Drain, Red LED (2)
Charge Pump Output
Flying capacitor C1 connection
Input voltage from battery
Flying capacitor C2 connection
Ground 1
Flying capacitor C1 connection
Flying capacitor C2 connection
LDO/Supply voltage input
Ground 2
Bias resistor connection
Red LED current set resistor
Green LED current set resistor
Blue LED current set resistor
Low active reset input pin. (Internal pull down 1 MΩ)
3
Description
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