- Sat Apr 15, 2006 7:49 am
#12326
Hello Guys
I have a simple relay circuit which has a strange behaviour. A 12V relay is controlled by a HCS12 MCU and when there is no load on the relay, the toggling of the relay works fine, however when a 12V load is connected to the relay, after a few itteration of toggling the MCU hangs.
The relay schematic is here http://www.cap.com.sg/misc/relay.jpg
I though it could be insufficient current and have verified that the current requirements of the MCU + Load is ok, I have also added filtering caps to eliminate unwanted spikes. Even with the changes, the relay works ok for a while and about 5 mins the MCU just hangs. Any ideas?
Thanks.
Jay
I have a simple relay circuit which has a strange behaviour. A 12V relay is controlled by a HCS12 MCU and when there is no load on the relay, the toggling of the relay works fine, however when a 12V load is connected to the relay, after a few itteration of toggling the MCU hangs.
The relay schematic is here http://www.cap.com.sg/misc/relay.jpg
I though it could be insufficient current and have verified that the current requirements of the MCU + Load is ok, I have also added filtering caps to eliminate unwanted spikes. Even with the changes, the relay works ok for a while and about 5 mins the MCU just hangs. Any ideas?
Thanks.
Jay