Si1141/42/43
5. Pin Descriptions
DNC
SDA
SCL
V DD
INT
1
2
3
4
10
QFN-10
5
9
8
7
6
LED1
GND
LED3
LED2
DNC
Table 17. Pin Descriptions
Pin
1
Name
SDA
Type
Bidirectional I 2 C Data.
Description
2
3
SCL
V DD
Input
Power
I 2 C Clock.
Power Supply.
Voltage source.
4
5
INT
DNC
Bidirectional Interrupt Output.
Open-drain interrupt output pin. Must be at logic level high during power-up
sequence to enable low power operation.
Do Not Connect.
This pin is electrically connected to an internal Si1141/42/43 node. It
should remain unconnected.
6
LED2 1
Output
LED2 Output. 1
Programmable constant current sink normally connected to an infrared
LED cathode.
7
LED3 2
Output
LED3 Output. 2
Programmable constant current sink normally connected to an infrared
LED cathode. If VLED < (V DD + 0.5 V), a 47 k ? pull-up resistor from LED3
to V DD is needed for proper operation. Connect directly to V DD when not in
use.
8
GND
Power
Ground.
Reference voltage.
9
LED1
Output
LED1 Output.
Programmable constant current sink normally connected to an infrared
LED cathode.
10
DNC
Do Not Connect.
This pin is electrically connected to an internal Si1141/42/43 node. It
should remain unconnected.
Notes:
1. Si1142 and Si1143 only. Connect to V DD in Si1141.
2. Si1143 only. Connect to V DD in Si1141 and Si1142.
70
Rev. 1.3
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