Temperature sensor combines accuracy, ultra-low power consumption and small size

ams has developed an integrated digital temperature sensor providing low power consumption and high accuracy in a small package measuring1.6mm x 1mm. The AS6200’s typical current is 6µA at a measurement rate of 4 samples per second, and its digital measurement outputs are accurate to ±0.4°C.

The AS6200 integrates the functions required in a temperature sensing system, making it simple for users to design the sensor into space-constrained or battery-powered products.

The device consists of a silicon bandgap sensor, an analogue-to-digital converter, a digital signal processor and a serial I2C interface. The on-chip DSP handles all linearization and calibration, producing a 12-bit (0.0625°C resolution) binary output.

Despite its integration, the AS6200 has been designed to draw very little current. Operating from a supply range of 1.8V-3.6V, the it draws just 1.5µA at a measurement rate of 1 sample. The conversion rate can be set in a range from 0.25Hz to 8Hz. At lower conversion frequencies, power consumption is lower. In standby mode, in which all the chip’s functions are turned off except the serial interface, it draws just 0.1µA (typical).

The sensor’s I2C interface allows for two devices to be connected to one bus. The sensor also has a pin dedicated to an Alert function, which triggers an interrupt at the host microcontroller when the measured temperature crosses a high or low temperature threshold set by the user.