1.Is there internal clamping (protection) diode present on ADC pin MCIMX6G2AVM07AB

[priyanka_a_mane]

1. Is there internal clamping (protection) diode present on ADC pin?  Below the snap shot for ADC equivalent ckt from datasheet we could see there are internal clamps present kindly confirm.

[igorpadykov]

Hi PRIYANKA 

yes, there is protection diode as depicted on Figure 67. 12-bit ADC Input

Impedance Equivalency Diagram i.MX6UL Datasheet
http://www.nxp.com/docs/en/data-sheet/IMX6ULCEC.pdf

Best regards
igor
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[sadatanvashisth]

what about internal protection on normal GPIOs and other interface pins like SPI, I2C, CSI etc

[igorpadykov]

there are also protection diodes.

[sadatanvashisth]

Thanks for the reply igor.

Are these diodes also connected in same way as that of ADC?Can we get the characteristic data for these diodes.?

[igorpadykov]

Hi sadatan

yes they are connected in similar way, characteristic data for these diodes

is not available.

Best regards
igor

[sadatanvashisth]

What about SPI Pins...If there is overshoot of 0.5V on any SPI pins like MOSI, Clock , MISO and NSS then will this result in conduction of protection diode and damage of these pins?

[sadatanvashisth]

Hi Igor,

Any comment on this?

[igorpadykov]

Hi sadatah

please check Table 8. Absolute Maximum Ratings,

Table 24. Single Voltage GPIO DC Parameters i.MX6UL Datasheet
http://www.nxp.com/docs/en/data-sheet/IMX6ULCEC.pdf

Best regards
igor

[sadatanvashisth]

Hi Igor,

Thanks for the reply.

But Is this true for MOSI and Clock signal of SPI as well? We are getting a waveform as attached here? Will that work?

                                                                                                               MISO

MOSI

SCLK

[igorpadykov]

Hi sadatan

yes this is applicable to spi signals.

Best regards
igor

[sadatanvashisth]

Thanks for reply Igor.

Can you please confirm that whether these signals waveforms I have attached in previous question are OK or not?

Also what is the time for which this overshoot of 0.6V is OK if my processor is working on 528MHZ?