EVAL-CN0532-EBZ is a MEMS accelerometer (ADXL1002) vibration sensing solution with included IEPE-compatible interface circuitry at 12.5 V bias, ±2 V output swing, and 4 mA current consumption, suitable for Condition-based Monitoring (CbM) applications. Since Piezoelectric sensors are predominantly used in CbM applications, IEPE is the de facto standard in CbM vibration sensing ecosystem. The IEPE interface, also commercially known as ICP, is a 2-wire protocol, signal and ground. In this protocol a data logger supplies a constant current via the signal line to the vibration sensor and the sensor modulates the voltage according to the measurand, typically between 10 V to 30 V. This reference design enables a direct IEPE piezoelectric sensor replacement with benefits of high bandwidth, temperature stability and ultralow noise MEMS accelerometers. This allows customers to easily evaluate an IEPE MEMS accelerometer solution for CbM applications on the same ICP piezoelectric sensor platform.
The EVAL-CN0532-EBZ is very straightforward to setup. A cable, and an ICP signal conditioner (or an IEPE compatible DAQ, or a current source) are needed. For electrical setup:
The accelerometer used in this reference design, ADXL1002, is an ultra-low noise and high bandwidth sensor. To achieve the best performance, a proper mechanical design is required to deliver vibration signal from the measurement point to the sensor. Careful considerations in design of EVAL-CN0532-EBZ PCB has been taken to avoid vibration signal distortion to the sensor due to mechanical resonance of the PCB structure. To best deliver the vibration signal from the measurement point to the PCB, we have designed EVAL-XLMOUNT1. This mechanical interface is optimized to have a 3dB flat mechanical response of up to 20 kHz. Therefore, by utilization of EVAL-XLMOUNT1, the vibration signal will be adequately coupled with the sensor. The following steps describe how to use EVAL-XLMOUNT1 with EVAL-CN0532-EBZ.
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