Request for low-load VOL characteristics / data for STM32MP213FAL

[I.T]

Hello,

According to Table 56 (Output voltage characteristics for all I/Os) in the STM32MP213FAL datasheet, the maximum VOL is specified as 0.4V under high load conditions (IOL = 5.5mA to 20mA).

In my application, the connected device has a strict VIL(Min) requirement of 0.35V. My actual load current is very low, around 10uA.

While I understand that VOL should stay very close to 0V under such a low load due to the CMOS structure, the datasheet only provides the Max 0.4V limit.

Strictly speaking, this does not show a match with my 0.35V requirement on paper.

Could you provide any reference curves, typical characteristics, or internal RON (on-resistance) values for the I/O pins to confirm that VOL drops well below 0.35V under a 10uA load? Thank you in advance for your support.

 

[I.T]

Hello Ted,

Thank you for your reply, and I apologize for my lack of explanation in my previous message.

To clarify, this is about the connection from the STM32MP213FAL (Output) to a receiving device (Input). The specifications are as follows:

• STM32MP213FAL: VDD = 3.3V, VOL = 0.4V (Max)
• Receiving Device: VDD = 3.3V, VIL = 0.35V (Max)

As you can see, on paper, the CPU's VOL (0.4V) exceeds the receiving device's VIL Max (0.35V), which technically results in a design failure.

However, in my application, the actual load current (IOL) from the CPU is extremely small (around 10uA). At such a low current, we believe the VOL will remain well below 0.4V and will not rise to that level.

Could you please provide any VOL (Max) values, reference curves, or typical characteristics for cases where the drive current (IOL) is much lower than the conditions specified in Table 5.3.16 (e.g., at 10uA)?

Best regards,

I.T