# EEPROM on IoT card

**URL:** <https://mangoh.discourse.group/t/eeprom-on-iot-card/1098>\
**Category:** IoT Cards\
**Created:** [January 23, 2018, 9:46pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098 "2018-01-23T21:46:15Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![gustavocarlos](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/gustavocarlos/32/371_2.png) [@gustavocarlos](https://mangoh.discourse.group/u/gustavocarlos)\
**Post date:** [January 23, 2018, 9:46pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/1 "2018-01-23T21:46:15Z")

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Hello all,

I am developing an IoT expansion board, and I my question is mandatory to have an EEPROM on it.

Thanks in advance

Gustavo

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**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\
**Post date:** [January 23, 2018, 10:11pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/2 "2018-01-23T22:11:01Z")

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The purpose of the EEPROM is to enable automatic configuration of the resources required for your card. Can you describe the card you’re developing? I might be able to provide guidance as to whether the eeprom will be beneficial. If you don’t want to discuss the details in public, you can send me a private message.

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**Author:** ![gustavocarlos](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/gustavocarlos/32/371_2.png) [@gustavocarlos](https://mangoh.discourse.group/u/gustavocarlos)\
**Post date:** [January 23, 2018, 10:20pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/3 "2018-01-23T22:20:41Z")

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Hi dfrey,

The IoT card will be a receiver for Sub Giga Hz RF application, it will receive data from radios and transmit it over UART to the host.  
My main doubt is if without EEPROM, the connector provides all supply mainly (1.8V and 3.3V)

Thank you!

Gustavo

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**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\
**Post date:** [January 23, 2018, 10:27pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/4 "2018-01-23T22:27:01Z")

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The 1.8V and 3.3V will always be there. The EEPROM might be beneficial if you hope to load kernel modules or configure the IoT slot GPIOs based on the presence of your card. Potentially we could support configuration of the UART based on parameters in the eeprom as well, but that’s not something we have put any thought/effort into yet.

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**Author:** ![gustavocarlos](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/gustavocarlos/32/371_2.png) [@gustavocarlos](https://mangoh.discourse.group/u/gustavocarlos)\
**Post date:** [January 23, 2018, 10:31pm UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/5 "2018-01-23T22:31:49Z")

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Hi dfrey,

Thanks a lot, now I understand.

BR

Gustavo

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**Author:** ![mikebrearton](https://avatars.discourse-cdn.com/v4/letter/m/9fc29f/32.png) [@mikebrearton](https://mangoh.discourse.group/u/mikebrearton)\
**Post date:** [September 24, 2021, 5:30am UTC](https://mangoh.discourse.group/t/eeprom-on-iot-card/1098/6 "2021-09-24T05:30:05Z")

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Is there a list of things for which the EEPROM is mandatory? I’m making a board that won’t be publicly distributed, so bypassing that annoyance would be a bonus.  
I would like to use the UART. It seems I’m good there… not used anyway.  
What about SDIO? Renfell makes a breadboard that exposes those pins but doesn’t have EEPROM… am I right to assume it will work anyway?