I've designed an analog input circuit to accept 0-5/10v or 0/4-20ma. User selectable with a few jumpers. The signals frequency will be low, no more than 150hz. This will be used in an automotive environment. I need more eyes on this circuit to see if I missed anything.
P19 in and P18 in will be used for a 0/4-20ma field input circuit. at 20ma, 10v is at R24, a voltage divider between R23 and R21 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.
P19 out and P18 in will be used for 0-10v field input circuit. A voltage divider between R23 and R21 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.
P19 in and P18 in will be used for 0-5v field input circuit. A voltage divider between R23, R21 and R22 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.
P19 in and P18 in will be used for a 0/4-20ma field input circuit. at 20ma, 10v is at R24, a voltage divider between R23 and R21 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.
P19 out and P18 in will be used for 0-10v field input circuit. A voltage divider between R23 and R21 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.
P19 in and P18 in will be used for 0-5v field input circuit. A voltage divider between R23, R21 and R22 will provide ~0-3.3v. The Bat54s is used for over voltage and reverse voltage protection.