Acelerómetro de 3 ejes

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Freescale Semiconductor Technical Data

Document Number: MMA7361L Rev 0, 04/2008

±1.5g, ±6g Three Axis Low-g Micromachined Accelerometer
The MMA7361L is a low power, low profile capacitive micromachined accelerometer featuring signal conditioning, a 1-pole low pass filter, temperature compensation, self test, 0g-Detect which detects linear freefall, and g-Select which allows for theselection between 2 sensitivities. Zero-g offset and sensitivity are factory set and require no external devices. The MMA7361L includes a Sleep Mode that makes it ideal for handheld battery powered electronics. Features • • • • • • • • • • • • • • 3mm x 5mm x 1.0mm LGA-14 Package Low Current Consumption: 400 μA Sleep Mode: 3 μA Low Voltage Operation: 2.2 V – 3.6 V High Sensitivity (800 mV/g @ 1.5g)Selectable Sensitivity (±1.5g, ±6g) Fast Turn On Time (0.5 ms Enable Response Time) Self Test for Freefall Detect Diagnosis 0g-Detect for Freefall Protection Signal Conditioning with Low Pass Filter Robust Design, High Shocks Survivability RoHS Compliant Environmentally Preferred Product Low Cost

MMA7361L

MMA7361L: XYZ AXIS ACCELEROMETER ±1.5g, ±6g

Bottom View

14 LEAD LGA CASE 1977-01Typical Applications • • • • • • • • 3D Gaming: Tilt and Motion Sensing, Event Recorder HDD MP3 Player: Freefall Detection Laptop PC: Freefall Detection, Anti-Theft Cell Phone: Image Stability, Text Scroll, Motion Dialing, E-Compass Pedometer: Motion Sensing PDA: Text Scroll Navigation and Dead Reckoning: E-Compass Tilt Compensation Robotics: Motion Sensing

Top View

N/C
13 12 11 10 9

N/CXOUT YOUT ZOUT VSS

14

Self Test N/C N/C g-Select 0g-Detect N/C

ORDERING INFORMATION
Part Number MMA7361LT MMA7361LR1 MMA7361LR2 Temperature Range –40 to +85°C –40 to +85°C –40 to +85°C Package Drawing 1977-01 1977-01 1977-01 Package LGA-14 LGA-14 LGA-14 Shipping Tray 7” Tape & Reel 13” Tape & Reel

VDD

6

5

4

3

2

1

Sleep
Figure 1. Pin Connections

© FreescaleSemiconductor, Inc., 2008. All rights reserved.

7

8

VDD

0g-Detect g-Select CLOCK GEN X-TEMP COMP

OSCILLATOR

XOUT

Sleep

G-CELL SENSOR

C to V CONVERTER

GAIN + FILTER

Y-TEMP COMP

YOUT

SELFTEST Self Test

CONTROL LOGIC NVM TRIM CIRCUITS

Z-TEMP COMP

ZOUT

VSS

Figure 2. Simplified Accelerometer Functional Block Diagram

Table 1. Maximum Ratings (Maximumratings are the limits to which the device can be exposed without causing permanent damage.)
Rating Maximum Acceleration (all axis) Supply Voltage Drop Test(1) Symbol gmax VDD Ddrop Tstg Value ±5000 –0.3 to +3.6 1.8 –40 to +125 Unit g V m °C

Storage Temperature Range 1. Dropped onto concrete surface from any axis.

ELECTRO STATIC DISCHARGE (ESD)
WARNING: This device is sensitive toelectrostatic discharge. Although the Freescale accelerometer contains internal 2000 V 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 ESDprecautions should be followed to avoid exposing the device to discharges which may be detrimental to its performance.

MMA7361L 2 Sensors Freescale Semiconductor

Table 2. Operating Characteristics Unless otherwise noted: -40°C < TA < 85°C, 2.2 V < VDD < 3.6 V, Acceleration = 0g, Loaded output(1)
Characteristic Operating Range Supply Voltage(3) Supply Current(4) Supply Current at Sleep Mode(4)Operating Temperature Range Acceleration Range, X-Axis, Y-Axis, Z-Axis g-Select: 0 g-Select: 1 Output Signal Zero-g (TA = 25°C, VDD = 3.3 V)(5), (6) Zero-g(4) Sensitivity (TA = 25°C, VDD = 3.3 V) 1.5g 6g Sensitivity(4) Bandwidth Response XY Z Output Impedance 0g-Detect Self Test Output Response XOUT, YOUT ZOUT Input Low Input High Noise Power Spectral Density RMS (0.1 Hz – 1 kHz)(4) Control...
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