ADXL203CE Datasheet Summary

General Description

The ADXL203CE is a high-precision, low-power, dual-axis accelerometer designed for measuring both dynamic and static acceleration forces. It features a full-scale range of ±1.7 g and is housed in an 8-terminal ceramic LCC package. The device provides signal-conditioned voltage outputs proportional to acceleration, making it suitable for applications requiring high accuracy and reliability.

Features

• High Precision: Measures acceleration with high accuracy.
• Low Power Consumption: Typical current consumption of 700 μA at 5 V.
• Dual-Axis Measurement: Measures acceleration on both X and Y axes.
• Wide Temperature Range: Operates from -40°C to +125°C.
• Bandwidth Adjustment: User-selectable bandwidth from 0.5 Hz to 2.5 kHz using external capacitors.
• Self-Test Feature: Allows functional testing of the accelerometer.
• RoHS Compliant: Environmentally friendly and compliant with RoHS standards.

Applications

• Platform Stabilization and Leveling: Ensures stability in various platforms.
• Navigation: Provides accurate acceleration data for navigation systems.
• Alarms and Motion Detectors: Detects motion and triggers alarms.
• High Accuracy Tilt Sensing: Measures tilt angles with high precision.
• Vibration Monitoring and Compensation: Monitors and compensates for vibrations.
• Abuse Event Detection: Detects and records impact events.

Functional Block Diagram

The ADXL203CE consists of a polysilicon surface micromachined sensor and signal conditioning circuitry. The output signals are analog voltages proportional to acceleration, with user-selectable bandwidth through external capacitors.

Pin Configuration

The ADXL203CE features an 8-pin LCC package with the following pin definitions:

• ST (Pin 1): Self Test input.
• NC (Pin 2): No Connect.
• COM (Pin 3): Common.
• NC (Pin 4): No Connect.
• NC (Pin 5): No Connect.
• YOUT (Pin 6): Y Channel Output.
• XOUT (Pin 7): X Channel Output.
• VS (Pin 8): Supply Voltage (3 V to 6 V).

Electrical Characteristics

• Measurement Range: ±1.7 g.
• Sensitivity: 1000 mV/g typical at 5 V supply.
• Zero g Bias: 2.5 V typical at 5 V supply.
• Noise Density: 110 µg/√Hz typical.
• Bandwidth: User-selectable from 0.5 Hz to 2.5 kHz.
• Operating Voltage Range: 3 V to 6 V.
• Quiescent Supply Current: 700 μA typical at 5 V.

Performance

• Zero g Bias Stability: ±0.1 mg typical over temperature.
• Sensitivity Accuracy: ±0.3% typical.
• Cross-Axis Sensitivity: ±1.5% typical.
• Self-Test Response: 750 mV typical change at 5 V supply.

Setting the Bandwidth

The bandwidth of the ADXL203CE can be adjusted using external capacitors CX and CY. The formula for calculating the 3 dB bandwidth is:
f−3dB​=2π×32kΩ×C(X,Y)1​
or more simply:
f−3dB​=C(X,Y)5μF​
A minimum capacitance of 2000 pF is required for CX and CY.

Self-Test Feature

The ST pin allows for self-testing of the accelerometer. Setting the ST pin to VS exerts an electrostatic force on the beam, resulting in a typical output change of 750 mV, indicating the accelerometer is functional.

Power Supply Decoupling

For most applications, a single 0.1 µF capacitor (CDC) is sufficient for decoupling the accelerometer from power supply noise. Additional decoupling may be necessary in noisy environments.

Using the ADXL203CE as a Tilt Sensor

The ADXL203CE can be used as a dual-axis tilt sensor by orienting the X and Y axes parallel to the earth's surface. The tilt angles can be calculated using the following formulas:
PITCH=arcsin(1gAX​)ROLL=arcsin(1gAY​)

Ordering Information

• Part Number: ADXL203CE.
• Package Type: 8-terminal ceramic LCC (E-8-1).
• Temperature Range: -40°C to +125°C.
• Supply Voltage: 5 V.
• Axes: Dual-axis (X and Y).

Conclusion

The ADXL203CE is a versatile and high-precision dual-axis accelerometer suitable for a wide range of applications requiring accurate measurement of acceleration forces. Its low power consumption, wide temperature range, and self-test feature make it an ideal choice for demanding applications.