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NCP1840
Oscillator
Charge Pump
Pin 1 ? CPO
Pin 10 ? R BIAS
Bandgap & Bias
Generator
Output DAC
Output DAC
Pin 2 ? LED1
Pin 3 ? LED2
Registers
Output DAC
Pin 4 ? LED3
Control Logic
Output DAC
Output DAC
Pin 5 ? LED4
Pin 11 ? LED5
Pin 8 ? SCL
Pin 9 ? SDA
Pin 7 ? DV CC
Pin 6 ? GND
Pin 15 ? GND
Logic Serial
Interface
Over Temp Detect
POR
Output DAC
Output DAC
Output DAC
Pin 12 ? LED6
Pin 13 ? LED7
Pin 14 ? LED8
Figure 3. NCP1840 Block Diagram
PIN DESCRIPTION
Pin
1
2 ? 5, 11 ? 14
6, 15, 21
7
8
9
10
16, 17, 19, 20
18
Name
CPO
LED1 ? LED8
GND
DV CC
SCL
SDA
R BIAS
C2 ? , C1 ? , C2+,
C1+
V BAT
Function
Charge pump output used as power supply to the LEDs. Should have a 2.2 m F ceramic
capacitor (X5R or X7R) connected to ground.
Current sink outputs for driving LEDs. Output current level and PWM duty cycle can be
programmed through the I 2 C interface.
Ground connection (Pin 21 is the exposed paddle and should be connected to ground)
Supply input for digital circuitry. Should have a 1 m F ceramic capacitor (X5R or X7R)
connected to ground.
I 2 C clock input
I 2 C serial data input/output
An external resistor connected to ground defines the full ? scale current for the LED outputs.
Charge pump flying capacitor connections. A 1 m F ceramic capacitor (X5R or X7R) should be
connected from C1+ to C1 ? and C2+ to C2 ? .
Supply input for the charge pump and analog circuitry. Should have a 2.2 m F low ESR
ceramic capacitor connected to ground.
http://onsemi.com
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