Re: transistor base input


I assume this is a PIC input configured as a digital input,
based on your two transistor interface circuit.

A simplified circuit for an analog input is shown in
Figure 13-4. Since the analog pins are connected to a
digital output, they have reverse biased diodes to VDD
and VSS.

Why would you use the input configured as an analog input,
instead of digital? Your circuit will output only two
states-- high and low.
Because the input is from the analog alarm system, which varies
between 6 to 9 volts. I cannot use that as an input.


A maximum source impedance of 10 k? is rec-
ommended for the analog sources.

Only if you need the full analog to digital converter
resolution over the full temperature range. What, exactly
do you want the microprocessor to know about the input signal?
Just high or low, alarm on or off...

k

.

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