Surviving the Hair Dryer: Continuous Calibration of a Crystal-Free Mote-on-Chip

The single chip micro-mote () is a 2×3 mm single-chip crystal-free mote-on-chip. implements the IEEE802.15.4 and BLE standards can communicate with off-the-shelf radios compliant to those standards. exclusively uses on-chip oscillators, including 2.4 GHz LC oscillator synthesize communication frequency, 2 MHz RC clock rate. challenge that drifts at 2,100 ppm over temperature range of 45∘C, far from 40 maximum drift mandated by standard. While one-shot calibration possible, any change causes fail. This paper describes continuous approach for adapt tuning its oscillators as changes. Experimental results show it allows keep communicating an radio even under extreme condition using hair dryer heat up 3∘C/min. Under these conditions, stays within ±40 limit 94% time. Similarly, ±1,000 99.98%