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Simple software validates the hardware CRC and detects errors in the serial bit stream of 1-Wire thermal devices

Posted: 02 Oct 2009     Print Version  Bookmark and Share

Keywords:1-Wire device  CRC hardware  error detection 

All 1-Wire thermal devices contain a unique identification code in read-only memory (ROM). This identification code is used as a unique network address on a 1-Wire bus. Additionally the scratchpad memory in some thermal devices also has a CRC byte to validate 1-Wire communication. This application note and the accompanying software provide an easy way to verify successful communication among 1-Wire devices or to detect errors in the serial data stream. The methodology calculates the DOW (Dallas One Wire) CRC value in software and validates that value against the CRC value from the CRC hardware implementation in each device. The DS1822 Econo 1-Wire Digital Thermometer serves as the example device.

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