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SCA610-E23H1A Datasheet(PDF) 7 Page - Murata Manufacturing Co., Ltd. |
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SCA610-E23H1A Datasheet(HTML) 7 Page - Murata Manufacturing Co., Ltd. |
7 / 12 page SCA610-E23H1A Murata Electronics Oy 7/12 www.muratamems.fi Doc. nr. 82 1525 00 Rev.A 2. Functional description 2.1. Measuring directions 2.2. Voltage to acceleration conversion Analog output can be transferred to acceleration using the following equation for conversion: y Sensitivit g V V on Accelerati out out 0 [g] where: Vout(0g) = nominal output of the device at 0g position with 5 V supply voltage (ratiometric output), Sensitivity is the sensitivity of the device and Vout is the output of the sensor. 2.3. Ratiometric Output Ratiometric output means that the zero offset point and sensitivity of the sensor are proportional to the supply voltage. If the SCA6X0 supply voltage is fluctuating the SCA6X0 output will also vary. When the same reference voltage for both the SCA6X0 sensor and the measuring part (A/D- converter) is used, the error caused by reference voltage variation is automatically compensated for. 2.4. Selftest and failure detection modes To ensure reliable measurement results the SCA6X0 has continuous interconnection failure and calibration memory validity detection. A detected failure forces the output signal close to power supply ground or VDD level, outside the normal output range. The calibration memory validity is verified by continuously running parity check for the control register memory content. In the case where a parity error is detected, the control register is automatically re-loaded from the EEPROM. If a new parity error is detected after re-loading data analog output voltage is forced to go close to ground level (<0.25 V). The SCA6X0 also includes a separate self test mode. The true self test simulates acceleration, or deceleration, using an electrostatic force. The electrostatic force simulates acceleration that is high enough to deflect the proof mass to the extreme positive position, and this causes the output signal to go to the maximum value. The self test function is activated by a separate on-off command on the self test input. -1 g position Vout,nom = 1.3 V 0 g position Vout,nom = 2.5 V +1 g position Vout,nom = 3.7 V + - + - |
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