I got it working without a custom DTH. Here is what I did:
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First I let the Smartthings App recognize it as a Thing
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Then I logged into the IDE (Web interface of Startthings) and selected My Devices from the menu
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Clicked on the device (Named “Thing”) to bring up the device properties page.
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Scrolled all the way to the bottom and clicked on “Edit”
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Changed the Type to SmartSense Motion Sensor
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Changed the Label to Sylvania Motion Sensor
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Clicked on Update to save the changes.
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Went back to the ST App and selected Home.
The Sensor is now identified as a motion and temperature sensor. It detects motion within 30 seconds (no 3 minute wait like other sensors I have tried). The temperature is very accurate as well.
So far it has been working great for over 2 hours. If anything changes I will post an update.
Hope this works for you.