STM32F427ZIT6 Maximum voltage on PA0 when used as analog (ADC) input

[NPuts.1]

From the datasheet PA0 is listed as a 5V tolerant IO (FT type).

Does this maximum of 5V still hold if the pin is mapped to the ADC input? If not, what is the maximum reading for this case?

[Danish1 · Accepted solution]

According to the Reference Manual section 8.3.12 "Analog configuration"

In the analog configuration, the I/O pins cannot be 5 Volt tolerant.

In this case I would expect the maximum to be Vdd. (Strictly speaking Vdd + 0.3 V).

Hope this helps,

Danish

[waclawek.jan]

There's also footnote (5) to the pin definitions table, saying

FT = 5 V tolerant except when in analog mode or oscillator mode (for PC14, PC15, PH0 and PH1).

> In this case I would expect the maximum to be Vdd. (Strictly speaking Vdd + 0.3 V).

Strictly speaking VDDA+0.3V, but in 'F4 there's also a requirement for VDDA=VDD.

JW