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Can the unused pin be left open when using the B board?

Latest Updated:03/01/2005

Question:

(A/D Converter)  The A board uses 8 analog input pins and the B board uses only 7 analog input pins. Since the software is the same for both boards, can the unused pin be left open when using the B board ? [2005/03/01]

Answer:

Although the software is the same for both boards, if the unused analog input pin on B board is set to input mode and left open, noise interference from this pin may result in MCU malfunction. Please connect the pin to either Vcc or Vss through a 1kΩ to 10kΩ resistor. (#104835)
Suitable Products
3803H
3803L
3823
3850A
3858
38D2
38D5
7544
7546
7547
7548
7549
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