# WP7610 IO voltage

**URL:** <https://forum.sierrawireless.com/t/wp7610-io-voltage/21754>\
**Category:** WP Series\
**Created:** [October 9, 2020, 6:09am UTC](https://forum.sierrawireless.com/t/wp7610-io-voltage/21754 "2020-10-09T06:09:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sreedev.k](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@sreedev.k](https://forum.sierrawireless.com/u/sreedev.k)\
**Post date:** [October 9, 2020, 6:09am UTC](https://forum.sierrawireless.com/t/wp7610-io-voltage/21754/1 "2020-10-09T06:09:08Z")

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I understand from the datasheet that the IO voltage of the WP modules are determined by VDD\_PX and that various levels like 1.2V, 1.8V etc. are possible. But there is no clear info as to how VDD\_PX can be configured to a particular voltage. In our case, we need 1.8V IOs.

Also there is no clear answer as to what the capabilities and limitations of each interface is. Mostly we are using USB. But there is no clear info on what UART/SDIO/I2C can do or cannot do.

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**Author:** ![Donald](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Donald](https://forum.sierrawireless.com/u/Donald)\
**Post date:** [October 12, 2020, 8:36am UTC](https://forum.sierrawireless.com/t/wp7610-io-voltage/21754/2 "2020-10-12T08:36:14Z")

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Hi sreedev.k

Please refer to Table 3-58: Digital I/O Characteristics (VDD\_PX = 1.80 V (nominal) signals) in AirPrime\_WP76xx\_Product\_Technical\_Specification\_Rev11.pdf.  
You can get this document here [wp76xx\_product\_technical\_specification](https://source.sierrawireless.com/resources/airprime/hardware_specs_user_guides/airprime_wp76xx_product_technical_specification/#sthash.gb4P6ky3.dpbs)

Hope it helps.

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**Author:** ![sreedev.k](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@sreedev.k](https://forum.sierrawireless.com/u/sreedev.k)\
**Post date:** [October 12, 2020, 9:48am UTC](https://forum.sierrawireless.com/t/wp7610-io-voltage/21754/3 "2020-10-12T09:48:58Z")

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I am not sure if this answered my question. My question is how to configure VDD\_PX? My IO signals will be 1.8V level. Since the table shows different values of VDD\_PX, I assume some sort of config has to be done to set VDD\_PX to 1.8V. Or can I just input IO signals with 1.8V level without any worries?

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**Author:** ![mlw](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/mlw/32/3706_2.png) [@mlw](https://forum.sierrawireless.com/u/mlw)\
**Post date:** [October 12, 2020, 12:06pm UTC](https://forum.sierrawireless.com/t/wp7610-io-voltage/21754/4 "2020-10-12T12:06:05Z")

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@sreedev.k

I have pushed a response in your other post [WP7610-G\_1104125 LTE module reference schematics](https://forum.sierrawireless.com/t/wp7610-g-1104125-lte-module-reference-schematics/21486/9)

Regards

Matt