Circuit & System Protection


Precision digital temperature sensors

20 February 2008 Circuit & System Protection

STMicroelectronics has announced a new series of precision digital-output temperature sensors, operating over the -55 to +125°C temperature range, which are well suited to low power applications. The sensors, in standard 8-lead TSSOP and SO-8 packages, are intended for use in any control application where a processor with an I²C bus/SMBus needs to take action based on an accurate digital reading of the local temperature, or where an alarm or interrupt is required when a preset temperature level is reached. They use a band-gap temperature sensor, with a programmable 9-bit to 12-bit sigma-delta ADC to digitise the temperature reading to a resolution of up to 0,0625°C. The devices are factory-calibrated and require no external components. Accuracy is ±3°C over the full -55 to +125°C temperature range, and ±2°C from -25 to +100°C. The sensors are designed for a supply voltage range of 2,7 to 5,5 V and have a low operating current of 75 μA at 3,3V. In shutdown mode the standby current is 1 μA maximum.



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