The DC2126A is a high-accuracy wireless temperature sensor, powered from ambient light, built using Analog Devices integrated circuits. A 24-bit delta-sigma ADC (analog-to-digital converter) reads a thermistor biased from a precision voltage reference. A switching power supply harvests energy from the built-in solar panel, and automatically switches over to the internal battery when no ambient light is available.
The entire self-contained, self-powered temperature sensor system fits into an enclosure less than 115 cubic centimetres in volume.
At the core of the board is the LTP5901-IPM, SmartMesh IP wireless mote (node), which provides the ultra-low power wireless mesh connectivity with greater than 99,999% data reliability and communicates the temperature to a central access point (manager). The LTP5901-IPM has onboard an ARM Cortex-M3 processor, which can be loaded with user-developed application code using the SmartMesh IP On-Chip software development kit. In the DC2126A, custom application code controls the duty cycling of the voltage reference, samples readings from the ADC and sends the data packet through the SmartMesh IP network.
The DC2126A can be easily added to the DC9000B SmartMesh IP Starter Kit, or any SmartMesh IP network. Temperature readings are sent through the mesh network to a demonstration PC software GUI that displays temperature, and whether the DC2126A is running on solar power or on battery.
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