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PDF MMA1220D Data sheet ( Hoja de datos )
| Número de pieza | MMA1220D | |
| Descripción | Low G Micromachined Accelerometer | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order Number: MMA1220D
Rev. 1, 06/2004
Low G
Micromachined Accelerometer
The MMA series of silicon capacitive, micromachined accelerometers features
signal conditioning, a 4-pole low pass filter and temperature compensation. Zero-g
offset full scale span and filter cut-off are factory set and require no external devices.
A full system self-test capability verifies system functionality.
MMA1220D
Features
• Integral Signal Conditioning
• Linear Output
• Ratiometric Performance
• 4th 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
MMA1220D: Z AXIS SENSITIVITY
MICROMACHINED
ACCELEROMETER
±8g
Typical Applications
• Vibration Monitoring and Recording
• Appliance Control
• Mechanical Bearing Monitoring
• Computer Hard Drive Protection
• Computer Mouse and Joysticks
• Virtual Reality Input Devices
• Sport Diagnostic Devices and Systems
ORDERING INFORMATION
Device
Temperature
Range
Package
MMA1220D
– 40 to +125°C SOIC-16
MMA1220DR2 – 40 to +125°C SOIC-16, Tape & Reel
16 LEAD SOIC
CASE 475-01
PIN ASSIGNMENT
N/C
N/C
N/C
ST
VOUT
STATUS
VSS
VDD
1
2
3
4
5
6
7
8
16 N/C
15 N/C
14 N/C
13 N/C
12 N/C
11 N/C
10 N/C
9 N/C
REV 1
© Motorola, Inc. 2004
G-Cell
Sensor
Integrator
Gain
Filter
Temp
Comp
VDD
VOUT
ST
Self-test
Control Logic &
EPROM
Trim Circuits
Oscillator
Clock
Gen.
VSS
Status
Figure 1. Simplified Accelerometer Functional Block Diagram
For More Information On This Product,
Go to: www.freescale.com
1 page  
Freescale Semiconductor, Inc.
BASIC CONNECTIONS
Pinout Description
N/C
N/C
N/C
ST
VOUT
STATUS
VSS
VDD
1
2
3
4
5
6
7
8
16 N/C
15 N/C
14 N/C
13 N/C
12 N/C
11 N/C
10 N/C
9 N/C
Pin No.
1 thru 3
4
5
6
7
8
9 thru 13
14 thru 16
Pin Name
—
ST
VOUT
STATUS
VSS
VDD
Trim pins
—
Description
Redundant VSS. Leave
unconnected.
Logic input pin used to initiate
self-test.
Output voltage of the
accelerometer.
Logic output pin to indicate
fault.
The power supply ground.
The power supply input.
Used for factory trim. Leave
unconnected.
No internal connection. Leave
unconnected.
VDD
Logic
Input
C1
0.1 µF
MMA1220D 6
4 ST
8 VDD
R1
VOUT 5 1 kΩ
7 VSS
C2
0.01 µF
Status
Output
Signal
Status
P1
ST P0
VOUT
R
A/D In
VSS 1 kΩ C 0.01 µF
C 0.1 µF
VDD
VRH
C 0.1 µF
VSS
C 0.1 µF
VDD
Power Supply
Figure 5. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
• 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 5.
• Use an RC filter of 1 kΩ 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.
Figure 4. SOIC Accelerometer with Recommended
Connection Diagram
Motorola Sensor Device Data
For More Information On This Product,
Go to: www.freescale.com
MMA1220D
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MMA1220D.PDF ] | |
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