
Si1141/42/43
Functional Block Diagram
VDD
Regulator
Temp
A
M
ADC
Filter
LED
Drivers
LED1
LED2 1
LED3 2
Visible
U
X
INT
SCL
Infrared
Digital Sequencer & Control Logic
SDA
I 2 C
Registers
Oscillator
GND
1. Si1142 and Si1143 only.
2. Si1143 only.
3.3 V
30 ohm
5%, 1/16 W
Host
Si1141
SDA
SCL
SDA
SCL
VDD
LED1
GND
CVDD
INT
INT
CVDD
15 μF, 20%, >6 V
0.1 uF
Figure 1. Si1141 Basic Application
3.3 V
No
Pop
4.3 V
30 ohm
5%, 1/16 W
Host
Si1143
SDA
SCL
VDD
LED1
GND
LED3
INT
LED2
22 uF, 20%, >6V
0.1 uF
Figure 2. Si1143 Application with Three LEDs and Separate LED Power Supply
Note: For more application examples, refer to “AN498: irLED Selection Guide for Si114x Proximity Applications”.
2
Rev. 1.3