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MMA1252KEG Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MMA1252KEG Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
3 / 10 page MMA1252 Sensors Freescale Semiconductor, Inc. 3 Table 2. Operating Characteristics (Unless otherwise noted: –40°C T A +105°C, 4.90 VDD 5.10, Acceleration = 0g, Loaded output. (1)) 1. For a loaded output the measurements are observed after an RC filter consisting of a 1 k resistor and a 0.1 F capacitor to ground. Characteristic Symbol Min Typ Max Unit Operating Range(2) Supply Voltage(3) Supply Current Operating Temperature Range Acceleration Range 2. These limits define the range of operation for which the part will meet specification. 3. Within the supply range of 4.9 and 5.1 volts, the device operates 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. VDD IDD TA gFS 4.90 1.1 –40 — 5.00 2.1 — 5 5.10 3.0 +105 — V mA °C g Output Signal +1g(4) Sensitivity (TA = 25°C, VDD = 5.0 V) (5) Sensitivity Bandwidth Response Nonlinearity 4. The device can measure both + and – acceleration. With +1g 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. 5. The device is calibrated at 3g. Sensitivity limits apply to 0Hz acceleration. VOFF S S f-3dB NLOUT 0.41 VDD 380 74.4 42.5 –1.0 0.5 VDD 400 80.0 50 — 0.58 VDD 420 85.6 57.5 +1.0 V mV/g mV/g/V Hz % FSO Noise RMS (0.1 Hz – 1.0 kHz) Spectral Density (RMS, 0.1 Hz – 1.0 KHz)(6) 6. At clock frequency 70 kHz. nRMS nSD — — 2.0 600 2.8 — mVrms g/ Self-Test Output Response Input Low Input High Input Loading(7) Response Time(8) 7. The digital input pin has an internal pull-down current source to prevent inadvertent self test initiation due to external board level leakages. 8. Time for the output to reach 90% of its final value after a self-test is initiated. V ST VIL VIH IIN tST 0.2 VSS 0.7 V DD –300 — 0.25 — — –125 2.0 0.3 0.3 VDD VDD –50 25 V/V V V A ms Status(9), (10) Output Low (Iload = 100 A) Output High (Iload = 100 A) 9. 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. 10. 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 s, unless a fault condition continues to exist. VOL VOH — VDD – 0.8 — — 0.4 — V V Output Stage Performance Electrical Saturation Recovery Time(11) Full Scale Output Range (IOUT = 200 A) Capacitive Load Drive(12) Output Impedance 11. Time for amplifiers to recover after an acceleration signal causes them to saturate. 12. Preserves phase margin (60°) to guarantee output amplifier stability. tDELAY VFSO CL ZO — VSS + 0.25 — — — — — 50 2.0 VDD – 0.25 100 — ms V pF Mechanical Characteristics Transverse Sensitivity(13) 13. A measure of the device's ability to reject an acceleration applied 90° from the true axis of sensitivity. VXZ,YZ — — 5.0 % FSO Hz |
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