Micropower 3-Sensor Combination Including Acceleration and Temperature

The ADXL363 is an ultralow power, three-sensor combination consisting of a 3-axis MEMS accelerometer, a temperature sensor, and an on-board analog-to-digital converter (ADC) input for synchronous conversion of an external signal. The entire system consumes less than 2 μA at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode.

The ADXL363 communicates via a serial port interface (SPI) and always provides 12-bit output resolution for all three sensors.

The ADXL363 temperature sensor operates with a scale factor of 0.065°C/LSB (typical). Acceleration and temperature data can be stored in a 512-sample multimode first in, first out (FIFO) buffer, allowing up to 13 sec of data to be stored.

In addition to the accelerometer and temperature sensor, the ADXL363 also provides access to an internal ADC for synchronous conversion of an additional analog input.

The ADXL363 operates on a wide 1.6 V to 3.5 V supply range, and can interface, if necessary, to a host operating on a separate, lower supply voltage. The ADXL363 is available in a 3 mm × 3.25 mm × 1.06 mm package.

APPLICATIONS

* Home healthcare devices

* Wireless sensors

* Motion enabled metering devices

* All sensors sampled synchronously

Up to 400 Hz ODR

Samples can be synchronized to external trigger

* Ultralow power

1.95 μA at 100 Hz ODR, 2.0 V supply, all sensors on

270 nA at 6 Hz motion activated wake-up mode

10 nA standby current

* 12-bit resolution for all sensors

Acceleration scale factor down to 1 mg/LSB

Temperature scale factor: 0.065°C/LSB (typical)

* Built-in features for motion-based system level power savings

Adjustable threshold sleep/wake modes for motion activation