Q&A

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No. 1176	Problem connecting CSW-M85 to existing design	2013-04-15

Hello! I am trying to use CSW-M85 to an existing system. Everything works fine when I use your Evaluation Board, but I got problem when connecting directly to the module using TTL 3.3V levels. I get data out of CSW-M85, but can't sink data zeroes to CSW-M85 enough to be a valid zero. I think that your module has an internal pull up of about 10K. My existing system has a serial resistance at TX of the same magnitude explaining the problem... Is there any way to disable the internal pull up of CSW-M85? Grateful for any hints! Best regards, Jonas Larby. MSc/Software Consultant.