iMX6 Open-Drain maximum rating

[erezsteinberg]

Hello experts,

I want to connect a PWM output using open-drain pad configuration.  The PWM bank voltage is 1.8V.

I couldn't find the information I need in the datasheet.

Can anyone answer :

1. In open-drain configuration, what is the maximum allowed external voltage on the pad?

2. What is the maximum allowed current through the internal transistor?

Regards,

Erez

[igorpadykov]

Hi Erez

1.  maximum allowed voltage on the pad is defined by

Datasheet Table 4. Absolute Maximum Ratings

Input/output voltage range :  OVDD+0.3V   (OVDD is the I/O supply voltage.)

2. maximum allowed current through the output transistor is not defined by

datasheet. Limitation would be max. Junction temperature defined in

Table 6. Operating Ranges

Note output transistor impedance may be affected by DSE, defined in

Table 33,34 GPIO Output Buffer Average Impedance

Best regards

igor

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[erezsteinberg]

Hi Igor,

Thanks for the prompt reply.

I saw the OVDD+0.3 spec in the Absolute Maximum Ratings table. However, I have doubt that it is correct for Open-Drain configuration.  I think OVDD+0.3 is the limit for Totem-Pole configuration.

Open-Drain is used very frequently for simple level-shifting is slow signals. I need to upshift from 1.8V to 3.3V.

Any way to verify this with the h/w team?

Regards,

Erez

[igorpadykov]

Hi Erez

yes this is correct. Note also there is esd protection

diode on pad.

Best regards

igor