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Analog Develops Programmable Embedded MEMS Vibration Sensor

An embedded, wide bandwidth and tri-axis vibration sensor has been developed by Analog Devices that facilitates the effective, affordable, and simple monitoring of the condition of manufacturing equipment.

The sensor has been developed to meet the increasing requirement for a more stable,  affordable, and precise method for condition-oriented equipment maintenance.

Vibration analysis forms a critical part of the detection of problems in modern-day factory environments. Employee safety and a plant’s overall productivity are most impacted by misaligned equipment, loose fittings, worn gears, and bad bearings.

The company’s ADIS16223 iSensor accelerometer with a broad bandwidth is more integrated, less expensive and is smaller. It integrates data capture, signal processing, a serial peripheral interface (SPI), with the best iMEMS technology in the industry. Broad bandwidth sensor data can be accessed through the data buffer structure and SPI.

The programmable SPI streamlines data transmission and offers easy access to condition monitoring alarms, internal filtering, , self test and serial # / device ID.

The accelerometer offers many advantages. These advantages include a more precise assessment of the source and level of vibration due to the sensor’s tri-axial and digital precision vibration monitoring capability, false alarms elimination, lower RMS noise and application configuration are all possible now through the sensor’s programmable bandpass and lowpass filtering, and saving system power through configurable embedded data capture in addition to enabling the device to tune to multiple applications and in-system adaptation for life cycle changes of end equipment.

The accelerometer’s 72.9 kSPS sample rate along with the 22 kHz sensor resonance are useful for applications related to machine health. They help system operators in detecting failing equipment well before an expensive damage occurs. Configuration options such as band pass and low pass are possible through digital filters that are programmable.

The dynamic range of the ADISI16223 is ±70g that is available on three axes. The 72.9 kSPS sample rate and the 22 kHz sensor resonance offer a flat frequency response that ranges between DC and 10 kHz. Such a range would suit most machine-health applications. While the SPI interface provides configuration options like the programmable digital filters that provide embedded self test control, alarm settings/condition monitoring, in addition to band pass and low-pass and band-pass options. Users will also able to access device ID and serial number registers.

There are three trigger modes for the data capture function. This enables the sensor to adapt itself to the product life cycle of the end systems.. Based on a programmable duty cycle, the sensor is able to automatically collect data that facilitates regular wakeup and capture. The data capture process can be initiated by users through manual data capture mode to provide read rate and power optimization

The event capture mode, on the other hand, updates the buffers on a continuous basis and monitors these buffers for an existing preset condition of the trigger. It is possible to capture pre-event as well as post-event data by this mode and generates an alarm indicator that causes an interruption to the system. The ADIS16223 also provides a digital temperature sensor, peak output capture and digital measurements of power supply.

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