LPC1820 and I2C

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by vdelabouere on Mon Sep 15 07:40:57 MST 2014
Hi all,
I'm using a Wolfson DAC (WM8523) which is connected to the I2C0 bus of the LPC1820.

The I2C communication is not very robust. Many times the Wolfson codec doesn't acknowledge the slave address. The data and clock signals look clean on the scope. I improved I2C communication by changing the pull ups from 10K to 1K but still not 100% reliable !

We are using this DAC for a long time but it is the first time I'm using a combination of LPC+WM8523

Is there any known I2C issues between the LPC1820 and this wolfson DAC ?
Thanks for your help.