TLV8544: TLV8544: PIR Motion Detection Refence Design Application Problem

Pooja Pandey Samant

Part Number: TLV8544

Hello Sir,

I am working on PIR Sensor Project. As I grounded Channel C in Op-Amp. Now my PIR output is always high. PIR not detecting any motion.

Kindly help.

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Pooja,

yes, because you have short-circuited the output of channel C

I would recommend the following changes:

See here for the picture:

Kai

0 kai klaas69 over 3 years ago in reply to kai klaas69

Guru 140200 points

And: Heavily enhance the supply voltage filtering of PIR !!

Do it as Paul Grohe has shown here:

Kai

0 Caro Walter over 3 years ago

Hey Pooja,

As Kai pointed out, the product page has a "Design of" which explains how the components were chosen and how to adjust accordingly for you design: https://www.ti.com/lit/an/snaa301a/snaa301a.pdf?ts=1618238436360&ref_url=https%253A%252F%252Fduckduckgo.com%252F

All the best,
Carolina

0 kai klaas69 over 3 years ago

Guru 140200 points

Part Number: TLV8544

Kai

0 Pooja Pandey Samant over 3 years ago in reply to kai klaas69

Thanku so much Kal.

0 kai klaas69 over 3 years ago in reply to Pooja Pandey Samant

Guru 140200 points

You are welcome

Kai

Amplifiers forum