- #1
triden
- 174
- 0
Hello,
I am in need of some form of "clamp" or level translation for an input to a uC. How can I prevent a signal from going beyond the VIH of the uC port? (approx 5.5vdc). The signal will be an ADC signal, so ideally the clamping circuit will not alter the adc input in any way. The reason I need a clamp is because sometimes a 12vdc switch is hooked up to the input which I need to limit to 5v. I was thinking of using an emitter follower to do this because the gain is ~1. Any other ideas?
Regards,
Chris
I am in need of some form of "clamp" or level translation for an input to a uC. How can I prevent a signal from going beyond the VIH of the uC port? (approx 5.5vdc). The signal will be an ADC signal, so ideally the clamping circuit will not alter the adc input in any way. The reason I need a clamp is because sometimes a 12vdc switch is hooked up to the input which I need to limit to 5v. I was thinking of using an emitter follower to do this because the gain is ~1. Any other ideas?
Regards,
Chris