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# PSoC 4 MCU

Valued Contributor

## GPIO Output voltage low level

Hi.

My customer use PSoC 4100S Plus (CY8C4127AZI-S455).

Please tell us of GPIO Output voltage low level and Output voltage high level.

What is the output voltage low level and Output voltage high level under the following conditions? or is there a calculation method?

①VDDD = 5V    IOL = 4mA

②VDDD = 5V    IOL = 8mA

③VDDD = 5V    IOL = 16mA

④VDDD = 5V    IOH =16mA

Does this value change with ambient temperature?

Best Regards.

1 Solution Moderator

## Re: GPIO Output voltage low level

We have to apologize our late response...

Checked internally if the GPIO VOL/VOH data you required (especially for VDDD=5V), however there are only the data based on VDDD=5.5V.

> VDD=5.5V, IOL= 4mA      VOL= 82mV

> VDD=5.5V, IOL= 8mA      VOL= 164mV

> VDD=5.5V, IOL= 16mA    VOL= 332mV

> VDD=5.5V, IOH= 16mA   VOH= 5.13V

Please take a look at these data just for your reference at this time.

thank you.

6 Replies Moderator

## Re: GPIO Output voltage low level

Currently, there is only following data in the datasheet.

Could you please let us know the reason why the data with condition ①－④ are needed? Valued Contributor

## Re: GPIO Output voltage low level

Dear Takashi-san

The voltage high level and the voltage low level vary depending on the state of the LED that is lit when using the matrix LED.

There is a concern that the current of the LED will fluctuate due to the influence, the brightness of the LED will change, and the product quality will be impaired.

So my customer wants to know some voltage high level and voltage low level.

Best Regards,

Asanuma Moderator

## Re: GPIO Output voltage low level

We have to apologize our late response...

Checked internally if the GPIO VOL/VOH data you required (especially for VDDD=5V), however there are only the data based on VDDD=5.5V.

> VDD=5.5V, IOL= 4mA      VOL= 82mV

> VDD=5.5V, IOL= 8mA      VOL= 164mV

> VDD=5.5V, IOL= 16mA    VOL= 332mV

> VDD=5.5V, IOH= 16mA   VOH= 5.13V

Please take a look at these data just for your reference at this time.

thank you.

Valued Contributor

## Re: GPIO Output voltage low level

Dear Takashi-san

I refer to this value.

Does this value change with ambient temperature?

Best Regards,

Asanuma Moderator

## Re: GPIO Output voltage low level

Asanuma-san,

I am sorry for not answering the other question.

> Does this value change with ambient temperature?

The VOL/VOH will change across temperature.

Valued Contributor

## Re: GPIO Output voltage low level 