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Communication Failure Between External I2C Master and CY8CPLC10 - KBA216056

Communication Failure Between External I2C Master and CY8CPLC10 - KBA216056

Anonymous
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Translation - Japanese: 外部I2CマスターとCY8CPLC10間の通信障害 - KBA216056 - Community Translated (JA)

Question:

The CY8CPLC10 device does not seem to respond to the I2C commands sent by an external I2C master. However, it responds correctly when using CY3240 I2C-USB Bridge and PLC control Panel as the I2C master. What could be a possible reason for this issue?

Answer:

The minimum required "Bus Free Time Between a STOP and START Condition" for the I2C interface to CY8CPLC10 is 500 µs (as can be found in CY8CPLC10 device datasheet).

A violation of this specification has seen to be a common cause for communication failure between external master controllers and CY8CPLC10. Please verify if this specification is adhered to in your external master code.

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