MEMS Chip Packs Accelerometer And Temperature Sensor

STMicroelectronics’ LIS2DTW12 combines a MEMS 3-axis accelerometer and a temperature sensor on a single die for use in space-constrained and battery-sensitive detectors such as shipping trackers, wearables, and IoT endpoints. With a sensing accuracy of 0.8°C, the chip reportedly offers precision comparable with stand-alone standard temperature sensors.

 

In addition to enhanced temperature compensation, the accelerometer offers 65 different user modes that enable developers to optimize power consumption and noise to meet application-specific requirements. It boasts a user-selectable full-scale range up to ±16g and measures acceleration with output data rates from 1.6 Hz to 1.6 kHz.

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Measuring 0.7-mm high, the LIS2DTW12 allows extra battery capacity for longer runtimes. Power-saving features let devices go even further between charges, and include a 50 nA power-down mode, multiple operating modes down to less than 1µA, a dedicated internal engine for processing accelerometer signals, and a large 32-level FIFO to reduce intervention from the main controller.

 

The LIS2DTW12 provides 16-bit accelerometer data and 12-bit temperature data through a high-speed I2C/SPI port, and allows single data conversion on demand. The motion engine performs free-fall and wakeup detection, single/double-tap recognition, activity/inactivity, stationary/motion detection, portrait/landscape detection, and 6D/4D orientation. ST’s advanced self-test capability is also built-in to verify the sensor is functioning correctly.

 

The LIS2DTW12 is specified for operation from -40°C to +85°C and available now in a 2 mm x 2 mm x 0.7 mm LGA-12 plastic LGA package, priced from $0.99 each/1,000. If your curiosity is piqued and you thirst for greater illumination, peruse the LIS2DTW12 datasheet.

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