Digital Temperature Sensor

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Product Description

STS21 Digital Temperature Sensor Product Summary
STS21, the new temperature sensor of Sensirion is about to set new standards in terms of size and intelligence: Embedded in a reflow solderable Dual Flat No leads (DFN) package of 3 x 3mm foot print and 1.1mm height it provides calibrated, linearized signals in digital, I2C format.

Using the same CMOSens® technology as Sensirion's successful and industry proven SHT2x humidity and temperature sensors, the STS21 offers superior performance and reliability. The ±0.2°C temperature specification allows for implementation of the STS21 in applications with high demands on temperature accuracy.

Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out by command. Furthermore, the resolution of STS21 can be changed by command (11bit up to 14bit), low battery can be detected and a checksum helps to improve communication reliability.

With made improvements and the miniaturization of the sensor the performance-to-price ratio has been improved – and eventually, any device should benefit from the cutting edge energy saving operation mode.

STS21 Digital Temperature Sensor FEATURES
• Fully calibrated
• Digital output, I2C interface
• Low power consumption
• Excellent long term stability
• DFN type package – reflow solderable

STS21 Digital Temperature Sensor PERFORMANCE
Temperature Specification

Parameter	Condition	min	typ	max	Units
Resolution	14 bit		0.01		°C
	12 bit		0.04		°C
Accuracy tolerance	typ		±0.2		°C
	max	see Figure 2			°C
Repeatability			±0.1		°C
Operating Range	extended	-40		125	°C
Response Time	τ63%	5		30	s
Long Term Drift			< 0.04		°C/yr

Electrical Specification

Parameter	Conditions	min	typ	max	Units
Supply Voltage, VDD		2.1	3.0	3.6	V
Supply Current, IDD	sleep mode		0.15	0.4	µA
	measuring	200	300	330	µA
Power Dissipation	sleep mode		0.5	1.2	µW
	measuring	0.6	0.9	1.0	mW
	average 11bit		8.6		µW
Communication	digital 2-wire interface, I2C protocol