TMS320F28035: Input clamp current

Wayne Huang

Dear Champs,

I am asking this for our customer.

On Sec 5.1 absolute maximum ratings,

1) On digital input (per pin), it shows the max input clamp current is +-20mA, but on the footnote (3), it shows the continuous clamp current per pin is +- 2mA. What is the difference between these two value? Is +-20mA for only instantaneous? for us, ms, sec?

2) The footnote (3) +- 2mA only applies on digital input pins but not on analog input pins, right? For analog pin, we should design external circuits only based on +- 20mA, Is my understanding correct?

Wayne

over 6 years ago

0 Hareesh Janakiraman over 6 years ago

TI__Guru* 95315 points

Wayne,

This has been dealt multiple times on e2e before. Please refer to the posts in this post:

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/747092

0 Ted Hsu over 6 years ago in reply to Hareesh Janakiraman

Prodigy 60 points

Hello Hareesh

So, what is the recommend continuous input current for one ADC pin?

Because I cannot see the final answer for this question.

If it existed in your link but i miss it, please help me to point out.

Thank you for your help!

Ted

0 Wayne Huang over 6 years ago in reply to Ted Hsu

TI__Genius 16925 points

Dear Hareesh,

Following Ted, let me explain more.

From the datasheet Sec 5.1, it only shows +-2mA applies on digital pins rather than on analog pins. Is it right? we want to doubly confirm this for external circuit design.

Wayne Huang

0 Joseph Casuga over 6 years ago in reply to Wayne Huang

TI__Mastermind 41120 points

Hi Wayne,

The +-2mA continuous clamp current also applies to analog pins on F28035 and F28004x as well.

Regards,

Joseph

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TMS320F28035: Input clamp current