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Pin 7 – ISEL connected to V
Pin
Mode
8
TX (transmission line) CMOS compatible (V
9
RX (receive line)
Tab. 4 Pin assignement UART interface
Example:
3.6
Electrical Characteristics
A DC/DC converter is used to flash the lamp (VCC_EM). Therefore, the supply current is reduced with
higher voltage and vice versa. The microcontroller (VCC_IO) is supplied via a linear reglator, hence the
supply current is constant.
The average current consumption at a sampling interval of 15 s (factory default) is 1.6 mA. Tab. 5 lists
the typical and maximum current values in each individual state during the sampling interval, which is
shown in the current profile in Fig. 10.
Power Supply
Status
Idle measurement
IR lamp pulse
Standby
Power off
Tab. 5 Current values in the individual measurement states, typ. (max.)
Idle
measurement
0
300 ms
Sampling intervall 15 s (configurable 10 s ... 1 h)
Fig. 10 States during a CO
Further electrical characteristics:
Signal
Clock frequency
Pull-up resistor
Tab. 6
Electrical characteristics
10
or left open: EE895 features UART interface:
CC
Note
CMOS compatible (V
Fig. 9 Example UART interface
VCC_IO
5.2 (7.9) mA
5.2 (7.9) mA
170 (200) µA
< 2 µA
IR lamp pulse
Standby / power off
300 ms
sampling interval
2
Unit
Min
Hz
500
kΩ
4.7
0.4 V; V
2.6 V)
OutLowMax
OutHighMin
0.9 V; V
InputLowMax
InputHighMin
3.3 V
< 0.1 µA
93 (95) mA
< 0.1 µA
< 0.1 µA
Max
Note
100000
100
Typical 10 kΩ
User Manual EE895 Miniature Sensor Module for CO
2.1 V)
VCC_EM
5 V
< 0.1 µA
60 (61) mA
< 0.1 µA
< 0.1 µA
, T and p
2
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