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Document overview

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Technical content

  • Small, Low-Cost, Rugged
  • Rapid Response
  • ± 75° Range
  • Fully Conditioned Analog Outputs

Applications

  • Scissor Lifts
  • Static Platforms
  • Survey Leveling Equipment
  • Laser Leveling CXTA01, CXTA02 The CXTA single- and dual-axis analog tilt sensors offer resolution, accuracy, and fast response in an inexpensive, easy-to-use package. The CXTA series design centers on a highly stable silicon micro-machined capacitive inclination sensor ele - ment. The CXTA series is fully signal conditioned with high level analog output(s), and optional analog temperature signal. Micro-machined devices, perfected in automotive safety applications, offer several distinct advantages over fluid, electrolytic, and pendulum-based sensors. Like other solid-state devices, they are more reliable than their me - chanical counterparts. In a package smaller than many pendulum or fluid raw sensing elements, completely integrated electronics eliminate the need for external components. CXTA Solid State, analog SerieS Unlike other micro-machined devices, the CXTA Series maintains its accu - racy and stability over temperature: < 2° of arc over the range 0° to 70° C. The output can be user corrected for temperature with the T option, yield - ing accuracy to within ± 0.5° over the angular range. A typical configuration using CXTA sensors is shown below. Each mod - ule is factory calibrated, tested and includes a calibration sheet. The module can be securely attached us - ing screws or adhesive. The CXTA is available in a standard nylon or high temperature aluminum package. Typical CXTA02 Configuration 6-30V GND Power Supply Xout Yout Temp (optional) A/D ConverterCXTA02 Micromachined Tilt Sensor Element

MEMSIC Inc. San Jose, California www.memsic.co m 6020-0013-03 Rev A

Ordering Information

The CXTA Series Tilt Sensors use a micro-machined acceleration sensing element with a DC response to measure inclination relative to grav- ity. The response of the tilt sensor depends on the magnitude of gravity parallel to the sensor element. The output of the tilt sensor will be an offset voltage plus the voltage re - sponse proportional to the amount of gravity measured by the sensor. Using the CXTA Sensor The voltage response of the CXTA is proportional to the sine of the tilt angle. Accurately measuring tilt angle involves solving the equation shown in Figure 1. To solve this equation the Zero Angle Voltage and Sensitivity must be determined prior to use, and the sensitivity must be converted to V/rad. MEMSIC provides this infor - mation on a calibration sheet with its CXTA products. For angles less than 20°, the sine function can be approximated by a linear relationship between the Vout and the tilt angle in degrees. Thus the simplified equation for small angle in degrees is: When the tilt angle is less than 20°, the error from linear approximation will be less than 2%. This is conve - nient when you don’t have or want the computing power to calculate an inverse sine function. Figure 1 Sensitivity (V/rad) Pin Color Function

1 Red Power

2 Black Ground

3 White Roll

4 Yellow Pitch

5 Green Temp

ø = Vout - Zero Angle Voltage Sensitivity ø = sin Vout (V) - Zero Angle Voltage (V)-1 Sensitivity (V/rad) ø Model Axes Linear Range Full Range Resolution CXTA01 X ± 20º ± 75º 0.05º CXTA02 X,Y ± 20º ± 75º 0.05º OPTIONS -T Temperature Sensor Internal -AL High Temperature Aluminum Package c a l l f a c t o r y f o r o t h e r c o n f i g u r a t i o n s Specifications CXTA01 CXTA02 Remarks Performance Linear Angular Range (°) ± 20 ± 20 Full Angular Range (°) ± 75 ± 75 Angular Resolution (° rms) 0.05 0.05 Sensitivity - small angles (mV/O) 35 ± 2 35 ± 2 Actual value provided with Sensor Sensitivity Drift (%/OC) 0.01 0.01 Zero Angle Voltage (Volts) 2.5 ± 0.15 2.5 ± 0.15 Actual value provided with Sensor Zero Angle Drift (mV/OC) 1.0 1.0 Typical Zero Angle Drift (O/OC) 0.03 0.03 Typical Non-Linearity (°) < 0.4 < 0.4 Over ± 20O not including Arcsine Error Bandwidth (Hz) 50 50 Settling Time (sec) 0.2 0.2 Alignment (°) ± 1 ± 1 Typical Cross-axis Sensitivity (%)) < 5 < 5 Inclusive of alignment error Environment Storage Temperature (OC) -55 to +85 -55 to +85 Nylon Package Operating Temperature (OC) -40 to +85 -40 to +85 Nylon Package Storage Temperature (OC) -55 to +105 -55 to +105 -AL High Temperature Package Operating Temperature (OC) -40 to +105 -40 to +105 -AL High Temperature Package Non-Operating Vibration (g rms) 10 10 20-2 kHz random Shock (g) 2000 2000 1 ms, half sine Electrical Supply Voltage (VDC) 6 - 30 6 - 30 Unregulated Current (mA) 4 8 Physical Weight (Nylon Package) 1.38 oz (43 gm) (Aluminum Package) 2.09 oz (65 gm) Specifications subject to change without notice Optional Aluminum Package