User Manual EE895
Miniature Sensor Module for CO
2
, Temperature and Barometric Pressure | 8
3.3 EE895 Block Diagram
Fig. 3
Block diagram
3.4 Pin Assignment
Bottom view
Fig. 4
Pin assignment
Pin no. Name
Type
Comment
1
VCC_EM
Power supply
Power supply emitter infra-red lamp (IR-L)
2
VCC_IO
Power supply
Power supply for the microcontroller
3
EN
Input
Enable the module. Tie to Vcc_IO for normal operation
4
GND
Power supply
Ground
1)
5
GND
Power supply
Ground
1)
6
RDY
Output
Data ready (open drain output)
7
ISEL
Input
Interface selection
8
TX / SCL
I/O
Transmission line (TX) / Serial Clock (SCL)
9
RX / SDA
I/O
Receive line (RX) / Serial Data (SDA)
1) Pins 4 and 5 shall be connected to the same potential.
Tab. 1
Pin assignment
