MMA2301D MOTOROLA | Alldatasheet

Document overview

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Technical content

Features

  • Integral Signal Conditioning
  • Linear Output
  • Ratiometric Performance
  • Fourth Order Bessel Filter Preserves Pulse Shape Integrity
  • Calibrated Self-test
  • Low Voltage Detect, Clock Monitor, and EPROM Parity Check Status
  • Transducer Hermetically Sealed at Wafer Level for Superior Reliability
  • Robust Design, High Shocks Survivability Typical Applications
  • Vibration Monitoring and Recording
  • Impact Monitoring

ORDERING INFORMATION

Figure 1. Simplified Accelerometer Functional Block Diagram

16 LEAD SOIC

Freescale Semiconductor, Inc.

MMA2301D Motorola Sensor Device Data Maximum Ratings (Maximum ratings are the limits to which the device can be exposed without causing permanent damage.) NOTES: 1. Dropped onto concrete surface from any axis. ELECTRO STATIC DISCHARGE (ESD) WARNING: This device is sensitive to electrostatic discharge. Although the Motorola accelerometers contain internal 2kV ESD protection circuitry, extra precaution must be taken by the user to protect the chip from ESD. A charge of over 2000 volts can accumulate on the human body or associated test equipment. A charge of this magnitude can alter the performance or cause failure of the chip. When handling the accelerometer, proper ESD precautions should be followed to avoid exposing the device to discharges which may be detrimental to its performance. Rating Symbol Value Unit Powered Acceleration (all axes) Gpd 1500 g Unpowered Acceleration (all axes) Gupd 2000 g Supply Voltage VDD –0.3 to +7.0 V Drop Test (1) Ddrop 1.2 m Storage Temperature Range Tstg –40 to +125 °C Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...

Motorola Sensor Device Data MMA2301D NOTES: 1. 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. 2. These limits define the range of operation fo r which the part will meet specification. 3. 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. 4. 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 V DD/2. 5. The device is calibrated at 35g. 6. At clock frequency ≅ 70 kHz. 7. The digital input pin has an internal pull-down current source to prevent inadvertent self test initiation due to external bo ard level leakages. 8. Time for the output to reach 90% of its final value after a self-test is initiated. 9. Time for amplifiers to recover after an acceleration signal causing them to saturate. 10. Preserves phase margin (60 °) to guarantee output amplifier stability. 11. A measure of the device's ability to reject an acceleration applied 90 ° from the true axis of sensitivity. 12. 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 se lf-test and Status pins in the application. 13. 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 wit h a high input for at least 100 us, unless a fault condition cont inues to exist. OPERATING CHARACTERISTICS (Unless otherwise noted: -40°C ≤ TA ≤ +105°C, 4.75 ≤ VDD ≤ 5.25, Acceleration = 0g, Loaded output(1)) Characteristic Symbol Min Typ Max Unit Operating Range(2) Supply Voltage(3) Supply Current Operating Temperature Range Acceleration Range V DD IDD TA gFS 4.75 3.0 -40 5.0 225 5.25 6.0 +125 V mA g Output Signal Zero g (TA = 25°C, VDD = 5.0 V)(4) Zero g Sensitivity (TA = 25°C, VDD = 5.0 V)(5) Sensitivity Bandwidth Response Nonlinearity VOFF VOFF,V S SV f-3dB NLOUT 2.4

0.46 VDD

9.5 1.86 360 -1.0 2.5

0.50 VDD

10.0 2.0 400 2.6

0.54 VDD

10.5 2.14 440 1.0 V V mV/g mV/g/V Hz % FSO Noise RMS (.01-1 kHz) Power Spectral Density Clock Noise (without RC load on output) (6) nRMS nPSD nCLK 110 2.0 2.8 mVrms µV/(Hz1/2) mVpk Self-Test Output Response Input Low Input High Input Loading (7) Response Time(8) gST VIL VIH IIN tST VSS 0.7 x VDD -30 -100 2.0 0.3 x VDD VDD -260 g V V µA ms Status (12)(13) Output Low (Iload = 100 µA) Output High (Iload = 100 µA) VOL VOH VDD -0.8 0.4 V V Minimum Supply Voltage (LVD Trip) V LVD 2.7 3.25 4.0 V Clock Monitor Fail Detection Frequency f min 50 — 260 kHz Output Stage Performance Electrical Saturation Recovery Time (9) Full Scale Output Range (IOUT = 200 µA) Capacitive Load Drive(10) Output Impedance tDELAY VFSO CL ZO 0.25 0.2 300 V DD -0.25 100 ms V pF Ω Mechanical Characteristics Transverse Sensitivity(11) Package Resonance VXZ,YZ fPKG 5.0 % FSO kHz Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...

integrated-circuit accelerometer. distance between the beams, and N is the number of beams. proportional to acceleration. Figure 2. Simplified Transducer Physical Model versus capacitors) to set the cut-off frequency. sections of the accelerometer are functioning. and sensitivity will scale linearly with applied supply voltage. the analog to digital conversion process.

  • Supply voltage falls below the Low Voltage Detect (LVD) voltage threshold
  • Clock oscillator falls below the clock monitor minimum frequency
  • Parity of the EPROM bits becomes odd in number. The fault latch can be reset by a rising edge on the self-test input pin, unless one (or more) of the fault conditions continues to exist. Acceleration Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...

Figure 3. SOIC Accelerometer with Recommended Figure 4. Recommend PCB Layout for Interfacing

  • Use a 0.1 µF capacitor on VDD to decouple the power source.
  • Physical coupling distance of the accelerometer to the microcontroller should be minimal.
  • Place a ground plane beneath the accelerometer to reduce noise, the ground plane should be attached to all of the open ended terminals shown in Figure 4
  • Use an RC filter of 1 k Ω and 0.01 µF on the output of the accelerometer to minimize clock noise (from the switched capacitor filter circuit).
  • PCB layout of power and ground should not couple power supply noise.
  • Accelerometer and microcontroller should not be a high current path.
  • A/D sampling rate and any external power supply switching frequency should be selected such that they do not interfere with the internal accelerometer sampling frequency. This will prevent aliasing errors. Pin Descriptions Pin No. Pin Name Description 1 thru 3 N/C Leave unconnected. 4 ST Logic input pin used to initiate self-test. 5V OUT Output voltage of the accelerometer. 6 STATUS Logic output pin to indicate fault. SS The power supply ground. 8V DD The power supply input. 9 thru 13 Trim pins Used for factory trim. Leave unconnected. 14 thru 16 — No internal connection. Leave unconnected.

9 N/C

6 Status

Freescale Semiconductor, Inc.

MMA2301D Motorola Sensor Device Data * 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 8 7654321 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. Freescale Sem iconductor, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...

2 PLACES, 16 TIPS

1.27 BSC

ALL DIMENSIONS ARE IN MILLIMETERS. CAUSE THE LEAD WIDTH TO EXCEED 0.75. Figure 5. Footprint SOIC-16 (Case 475-01) Freescale Semiconductor, Inc.