19
3.8
Accessories
1 – Wire devices for FM3622
One of the realized features is 1-Wire® data protocol, which enables connection of
thermometer (DS1820, DS18S20 and DS18B20) and I-Button type:
DS1990A
(Figures 9 and 10
show FM3622 and 1-wire® device connection schemes).
Left row of pins
1W.PWR
(FM3622 – pin5)
1
Right row of pins
1W. Data
(FM3622 – pin4)
2
1
Vpp (+5 Volts DC) –
power source for
external digital
sensor
GND
(FM3622 – pin7)
3
Digital Input
4
2
Output from external
digital sensor
Figure 9. Digital thermometer DS1820 and TTJ100 connection scheme
Figure 10. I-Button DS1990A connection scheme
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