Driver identification, temperature sensors, NVRAM, digital I/O and analog input are quite often used on vehicle and M2M applications. 1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. that provides low-speed data, signaling, and power over a single signal.
At this time, there are approximately 40 1-wire devices available from Dallas Semiconductor Corp. 1-Wire devices can be grouped by their functions into several categories:
‧Identification plus temperature
‧Identification plus temperature logger
‧Identification plus temperature and humidity logger
‧Identification plus real time clock
‧Identification plus NV SRAM or OTP EPROM or EEPROM
‧Identification plus SHA-1 secure EEPROM
Thanks to the integration of 1-wire interface into In-Vehicle Computers, so system integrators now can use one simple interface to connect variety devices which are often utilized in telematics applications. Beside the hardware interface, also provide software API to write and read data to and from any kind of 1-wire devices.