# Issue of I2C communication with PCA9615

**URL:** <https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447>\
**Category:** Sparkfun\
**Created:** [30 January 2019 23:08 UTC](https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447 "2019-01-30T23:08:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ChunYi79527](https://avatars.discourse-cdn.com/v4/letter/c/858c86/32.png) [@ChunYi79527](https://forum.core-electronics.com.au/u/ChunYi79527)\
**Post date:** [30 January 2019 23:08 UTC](https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447/1 "2019-01-30T23:08:57Z")

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I am using PCA9615 for I2c communication. I connected the GND VDDA SDA and SCL to my MCU and sensor, yet it didn’t work. !  
The way I connected it is shown in the picture below. What should I do make it functional?

 ![12873](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/7/7ba18552d2397adae6ddda72f7cb384d7035e0a0.jpeg)

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**Author:** ![Stephen](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/stephen/32/1599_2.png) [@Stephen](https://forum.core-electronics.com.au/u/Stephen)\
**Post date:** [31 January 2019 03:21 UTC](https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447/2 "2019-01-31T03:21:28Z")

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Hi Chun,

I’ll need a bit more information about your setup:  
How long are your cables?  
What Micro controller are you using?  
What code are you using?  
What voltage is going into the PCA9615?  
How is everything wired up? (please include a wiring diagram)  
What are you communicating with?  
What type of Ethernet cord are you using?

Thanks! Looking forward to helping once I get a bit more info!

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**Author:** ![ChunYi79527](https://avatars.discourse-cdn.com/v4/letter/c/858c86/32.png) [@ChunYi79527](https://forum.core-electronics.com.au/u/ChunYi79527)\
**Post date:** [31 January 2019 04:39 UTC](https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447/3 "2019-01-31T04:39:57Z")

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Hi Stephen,

I fixed the problem. It’s because I didn’t set the proper baud rate. Now everything is functional.

Thanks for the reply.

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**Author:** ![Stephen](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/stephen/32/1599_2.png) [@Stephen](https://forum.core-electronics.com.au/u/Stephen)\
**Post date:** [31 January 2019 22:29 UTC](https://forum.core-electronics.com.au/t/issue-of-i2c-communication-with-pca9615/4447/4 "2019-01-31T22:29:31Z")

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Hi ChuYi,

I’m glad it was something simple! There are a lot of elements to these and I was worried it would take a while to identify!