I have a movement detector producing 0V at idle and up to 0.4V-0.5V when th= ere is a movement. This output goes to another device whose logic level Hig= h Vih is > 1.3V and Low is
Tranistor or FET recommendation
Jul 24, 2012
3 Replies
there is a movement. This output goes to another device whose logic level H= igh Vih is > 1.3V and Low is <0.4V. Any suitable transistor or FET wi= th very low leakage (few uA)current in both On and OFF states and in a smal= l package. Voltage available on board is 1.8V.
A transistor or FET is not appropriate for that application. You want a com= parator such as this :
formatting link
available from places like Mouser for $0.33. Use the Figure 5 in the data s= heet except change the 220K to 1.0M and the 100K with 120K. The 1.8V VCC pl= ugs in where they show 5V.
n there is a movement. This output goes to another device whose logic level= High Vih is > 1.3V and Low is <0.4V. Any suitable transistor or FET = with very low leakage (few uA)current in both On and OFF states and in a sm= all package. Voltage available on board is 1.8V.
omparator such as this :
formatting link
sheet except change the 220K to 1.0M and the 100K with 120K. The 1.8V VCC = plugs in where they show 5V.
That's perfect. Thanks.
doesn't need a special transistor:
+1.8 ---+---------+ | | | [1M] | | | +------- out [1M] C / | |/ +------| NPN eg: bc547 | |\ [1M] E \ | | 0V ---+--- | | in ---------------'
?? 100% natural
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