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Circuit for HVI digital input from normal IO in S12ZVL

Question asked by RAJIV BANDODKAR on Aug 17, 2016
Latest reply on Aug 18, 2016 by Radek Sestak


I am using S12ZVL 32 pin LQFP for my project. The MCU has only one HVI input. I need additional 2 in digital mode. I used the HVI style circuit with a resistor divider of 56K and 100K  to ground (with cap across 100K for filtering) on pins PAD2 and PAD3. I am also enabling the internal pull up as need, wake-up from sleep mode also. Functionally there I found no problem.

I found the voltage of 5.8V on the I/O for voltages up to 20V input.

Are there any diodes to Vdd and ground on the I/Os?

Is this recommended?


Rajiv Bandodkar.