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Example:
Fig. 7
Example UART interface
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. 8.
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. 8
States during a CO
Further electrical characteristics:
Signal
Clock frequency
Pull-up resistor
Tab. 6
Electrical characteristics
Power Supply
VCC_IO
6.2 (9.9) mA
6.2 (9.9) mA
190 (300) µA
<2 µA
IR lamp pulse
Standby / power off
300 ms
sampling interval
2
Unit
Hz
kΩ
3.3 V
<0.1 µA
85 (95) mA
<0.1 µA
<0.1 µA
Min
Max
500
100 000
4.7
100
Miniature Sensor Module for CO
User Manual EE895
VCC_EM
5 V
<0.1 µA
60 (66) mA
<0.1 µA
<0.1 µA
Note
Typical 10 kΩ
, Temperature and Barometric Pressure | 11
2
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