Marc Trachy

Vtst on HC908QT1/2

Discussion created by Marc Trachy on Sep 19, 2008
Latest reply on Sep 23, 2008 by Ake Webjorn
I am having some troubles with getting into monitor mode with the high voltage.  When I apply Vtst to the IRQ pin (I am using 8.5V for Vtst and 5V for Vdd), the chip starts to heat up surprisingly quickly and reaches over 100C.  This seems to be due to a large amount of current being drawn by the device via the IRQ pin. 

I have two questions.  Is this normal?  If it is, how long can the device survive 8.5V on the IRQ pin?

I'll have to order some more of these chips before I can try anything else, but I thought I'd ask here for advice.