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3.3
EE895 Block Diagram
3.4
Pin Assignment
Pin
Name
1
VCC_EM
2
VCC_IO
3
EN
4
GND
5
GND
6
RDY
7
ISEL
8
TX / SCL
9
RX / SDA
Tab. 1 Pin assignment
3.5
Pin Description
Pin 1 - VCC_EM
Power supply for the infrared lamp (IR-L). For optimizing of the energy consumption such as in battery-
powered devices, the IR-L can be powered separately.
The IR-L does not have to be powered continuously, as it needs power supply during the measurement
cycle t
only, see Figure 6. Between the measurement cycles the current consumption of IR-L is
meas
approx. 0.1 µA.
User Manual EE895 Miniature Sensor Module for CO
Fig. 5
Fig. 6 Pin assignment
Type
Comment
Power supply
Power supply emitter infra-led lamp (IR-L)
Power supply
Power supply for the microcontroller
Input
Enable the module. Tie to Vcc_IO for normal operation
Power supply
Ground
Power supply
Ground
Output
Data ready (open drain output)
Input
Interface selection
I/O
Transmission line (TX) / Serial Clock (SCL)
I/O
Receive line (RX) / Serial Data (SDA)
, T and p
2
Block diagram
1)
1)
1) pins 4 and 5 shall be connected to the same potential
7
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