SCA610-E28H1A-6 Ver la hoja de datos (PDF) - Murata Manufacturing

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SCA610-E28H1A-6

SCA610-E28H1A SINGLE AXIS ACCELEROMETER WITH ANALOG INTERFACE

Murata Manufacturing 

2. Functional description

2.1. Measuring directions

-

+

SCA610-E28H1A

+

-

-1 g position

Vout,nom = 1.3 V

0 g position

Vout,nom = 2.5 V

+1 g position

Vout,nom = 3.7 V

2.2. Voltage to acceleration conversion

Analog output can be transferred to acceleration using the following equation for conversion:

Acceleration = Vout − Vout (0g ) [g]

Sensitivity

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.

Murata Electronics Oy

www.muratamems.fi

Doc. nr. 82 1580 00

8/13

Rev.B

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