MMA2301 FREESCALE | Alldatasheet
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detrimental to its performance. Table 1. Maximum Ratings
- Dropped onto concrete surface from any axis.
Table 2. Operating Characteristics
- For a loaded output the measurements are observed after an RC filter consisting of a 1 k Ω resistor and a 0.01 µF capacitor to ground.
- These limits define the range of operation fo r which the part will meet specification.
- Within the supply range of 4.75 and 5.25 volts, the device operat es as a fully calibrated linear accelerometer. Beyond these supply limits
the device may operate as a linear device but is not guaranteed to be in calibration.
- The device can measure both + and - acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output
will increase above VDD/2 and for negative acceleration the output will decrease below VDD/2.
- The device is calibrated at 35g.
0.46 VDD
0.50 VDD
0.54 VDD
- At clock frequency ≅ 70 kHz.
- The digital input pin has an internal pul l-down current source to prevent inadvertent self test initiation due to external board level leakages.
- Time for the output to reach 90% of its final value after a self-test is initiated.
- The Status pin output is not valid following power-up until at least one rising edge has been applied to the self-test pin. The Status pin is
high whenever the self-test input is high, as a means to check the connectivity of the self-test and Status pins in the application.
- The Status pin output latches high if a Low Voltage Detection or Clock Frequency failure occurs, or the EPROM parity changes to odd. The
Status pin can be reset low if the self-test pin is pulsed with a high input for at least 100 us, unless a fault condition continues to exist.
- Time for amplifiers to recover after an acceleration signal causing them to saturate.
- Preserves phase margin (60 °) to guarantee output amplifier stability.
- A measure of the device's ability to reject an acceleration applied 90° from the true axis of sensitivity.
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surface-micromachined integrated-circuit accelerometer. wafer level using a bulk micromachined cap wafer. is a measure of acceleration. distance between the beams, and N is the number of beams. ratiometric and proportional to acceleration. Figure 3. Simplified Transducer Physical Model versus electronic sections of the accelerometer are functioning. and sensitivity will scale linearly with applied supply voltage. in the analog to digital conversion process. Parity of the EPROM bits becomes odd in number.
Figure 4. SOIC Accelerometer with Recommended Figure 5. Recommend PCB Layout for Interfacing microcontroller should be minimal. interfere with the internal accelerometer sampling frequency. This will prevent aliasing errors. Table 3. Pin Descriptions 1 thru 3 N/C Leave unconnected.
4 ST Logic input pin used to initiate self-
5V OUT Output voltage of the accelerometer. 6 STATUS Logic output pin to indicate fault. 8V DD The power supply input.
9 N/C
6 Status
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- When positioned as shown, the Earth's gravity will result in a positive 1g output. Dynamic Acceleration Sensing Direction 10 11 12 13 14 15 16 8765 4321 Direction of Earth's gravity field.* Front View Side View Static Acceleration Sensing Direction −x+x 16-Pin SOIC Package N/C pins are recommended to be left FLOATING Top View Acceleration of the package in the +X direction (center plate moves in the -X direction) will result in an increase in the output. Activation of Self Test moves the center plate in the −X direction, resulting in an increase in the output.
shorting between solder pads. Figure 6. Footprint SOIC-16 (Case 475-01)
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