topic Re: Query on the Tamper Pin in i.MX Processors

Query on the Tamper Pin

puneethkumar — Tue, 02 Mar 2021 09:27:55 GMT

Dear Team,

There are total 10 tamper pins together in the application processor which i am using.

I am planning to use only two pins a tamper, other pins as the GPIO's.

It is mentioned like this in the datasheet for the power section of tamper pins.

" VDD_TMPR_CSI_1P8_3P3 Shall be connected to VDD_SNVS_LDO_1P8_CAP when used as a
tamper pin. In CSI mode use an external 1.8 V supply. In this case, follow the 1.8 VI/O specification above."

If i want to use the above case ( i.e two as a tamper pin & other as GPIO) what should be the power domain to VDD_TMPR_CSI_1P8_3P3.

Thanks in advance.

Re: Query on the Tamper Pin

Yuri — Wed, 03 Mar 2021 11:23:03 GMT

@puneethkumar
Hello,

connect VDD_TMPR_CSI_1P8_3P3 to VDD_SNVS_LDO_1P8_CAP.

Regards,
Yuri.

Re: Query on the Tamper Pin

puneethkumar — Mon, 15 Mar 2021 05:30:47 GMT

Thanks for the reply

If i make above connection will i able to use tamper pins both as GPIO & tamper detection pins

Re: Query on the Tamper Pin

Yuri — Mon, 15 Mar 2021 07:34:07 GMT

@puneethkumar
Hello,

It is recommended to use VDD_SNVS_LDO_1P8_CAP as voltage source
for the tamper pins in order to be able to detect tampers in low power modes.
If there are not requirements to detect events in low power modes, any
voltage source may be applied.

Regards,
Yuri.