MOTOROLA MMA2200W

MOTOROLA
Freescale Semiconductor, Inc.
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SEMICONDUCTOR TECHNICAL DATA
MMA1201P
MMA2200W
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.
Features
• Integral Signal Conditioning
Freescale Semiconductor, Inc...
• Linear Output
MMA1201P: Z AXIS SENSITIVITY
MMA2200W: X AXIS SENSITIVITY
MICROMACHINED
ACCELEROMETER
± 40g
• Ratiometric Performance
• 4th Order Bessel Filter Preserves Pulse Shape Integrity
• Calibrated Self–test
• Low Voltage Detect, Clock Monitor, and EPROM Parity Check Status
16
15
14
13
12
11
10
9
• Transducer Hermetically Sealed at Wafer Level for Superior Reliability
• Robust Design, High Shocks Survivability
• Two Packaging Options Available:
1) Plastic DIP for Z Axis Sensing (MMA1201P)
2) Wingback for X Axis Sensing (MMA2200W)
1
2
3
4
5
6
7
8
DIP PACKAGE
CASE 648C–04
MMA1201P
Typical Applications
• Vibration Monitoring and Recording
• Appliance Control
• Mechanical Bearing Monitoring
• Computer Hard Drive Protection
12
• Computer Mouse and Joysticks
• Virtual Reality Input Devices
3
4
5
6
WB PACKAGE
CASE 456–06
MMA2200W
• Sports Diagnostic Devices and Systems
SIMPLIFIED ACCELEROMETER FUNCTIONAL BLOCK DIAGRAM
VDD
G–CELL
SENSOR
VST
SELF–TEST
INTEGRATOR
GAIN
CONTROL LOGIC &
EPROM TRIM CIRCUITS
FILTER
OSCILLATOR
TEMP
COMP
VOUT
CLOCK GEN.
VSS
STATUS
Figure 1. Simplified Accelerometer Functional Block Diagram
REV 0
Motorola Sensor Device Data
 Motorola, Inc. 2000
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1
MMA1201P MMA2200W
Freescale Semiconductor, Inc.
MAXIMUM RATINGS (Maximum ratings are the limits to which the device can be exposed without causing permanent damage.)
Symbol
Value
Unit
Powered Acceleration (all axes)
Rating
Gpd
500
g
Unpowered Acceleration (all axes)
Gupd
2000
g
Supply Voltage
VDD
–0.3 to +7.0
V
Ddrop
1.2
m
Tstg
– 40 to +105
°C
Drop Test(1)
Storage Temperature Range
NOTES:
1. Dropped onto concrete surface from any axis.
Freescale Semiconductor, Inc...
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
2
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.
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Motorola Sensor Device Data
Freescale Semiconductor, Inc. MMA1201P MMA2200W
OPERATING CHARACTERISTICS
(Unless otherwise noted: 0°C
v TA v +85°C, 4.75 v VDD v 5.25, Acceleration = 0g, Loaded output(1))
Characteristic
Symbol
Min
Typ
Max
Unit
VDD
IDD
TA
gFS
4.75
4.0
40
—
5.00
5.0
—
38
5.25
6.0
+85
—
V
mA
°C
g
VOFF
VOFF,V
S
SV
f –3dB
NLOUT
2.2
0.44 VDD
47.5
9.3
360
1.0
2.5
0.50 VDD
50
10
400
—
2.8
0.56 VDD
52.5
10.7
440
+1.0
V
V
mV/g
mV/g/V
Hz
% FSO
nRMS
nPSD
nCLK
—
—
—
—
110
2.0
3.5
—
—
mVrms
µV/(Hz1/2)
mVpk
Self–Test
Output Response
Input Low
Input High
Input Loading(7)
Response Time(8)
gST
VIL
VIH
IIN
tST
20
VSS
0.7 x VDD
30
—
30
0.3 x VDD
VDD
300
10
g
V
V
µA
ms
Status(12)(13)
Output Low (Iload = 100 µA)
Output High (Iload = 100 µA)
VOL
VOH
—
VDD .8
—
—
0.4
—
V
V
Minimum Supply Voltage (LVD Trip)
VLVD
2.7
3.25
4.0
V
fmin
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
—
0.3
—
—
0.2
—
—
300
—
VDD 0.3
100
—
ms
V
pF
Ω
Mechanical Characteristics
Transverse Sensitivity(11)
Package Resonance
VZX,YX
fPKG
—
—
—
10
5.0
—
% FSO
kHz
Operating Range(2)
Supply Voltage(3)
Supply Current
Operating Temperature Range
Acceleration Range
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Output Signal
Zero g (VDD = 5.0 V)(4)
Zero g
Sensitivity (TA = 25°C, VDD = 5.0 V)(5)
Sensitivity (VDD = 5.0 V)
Bandwidth Response
Nonlinearity
Noise
RMS (.01–1 kHz)
Power Spectral Density
Clock Noise (without RC load on output)(6)
Clock Monitor Fail Detection Frequency
*
*
*
*
—
—
—
110
2.0
*
*
*
NOTES:
1. For a loaded output the measurements are observed after an RC filter consisting of a 1 kΩ resistor and a 0.01 µF capacitor to ground.
2. These limits define the range of operation for which the part will meet specification.
3. Within the supply range of 4.75 and 5.25 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.
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 VDD/2.
5. The device is calibrated at 20g.
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 board 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.
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 by a rising edge on self–test, unless a fault condition continues to exist.
*
^
Motorola Sensor Device Data
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MMA1201P MMA2200W
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PRINCIPLE OF OPERATION
The Motorola accelerometer is a surface–micromachined
integrated–circuit accelerometer.
The device consists of a surface micromachined capacitive sensing cell (g–cell) and a CMOS signal conditioning
ASIC contained in a single integrated circuit package. The
sensing element is sealed hermetically at the wafer level
using a bulk micromachined “cap’’ wafer.
The g–cell is a mechanical structure formed from semiconductor materials (polysilicon) using semiconductor processes (masking and etching). It can be modeled as two
stationary plates with a moveable plate in–between. The
center plate can be deflected from its rest position by subjecting the system to an acceleration (Figure 2).
When the center plate deflects, the distance from it to one
fixed plate will increase by the same amount that the distance to the other plate decreases. The change in distance is
a measure of acceleration.
The g–cell plates form two back–to–back capacitors
(Figure 3). As the center plate moves with acceleration, the
distance between the plates changes and each capacitor’s
value will change, (C = Aε/D). Where A is the area of the
plate, ε is the dielectric constant, and D is the distance
between the plates.
The CMOS ASIC uses switched capacitor techniques to
measure the g–cell capacitors and extract the acceleration
data from the difference between the two capacitors. The
ASIC also signal conditions and filters (switched capacitor)
the signal, providing a high level output voltage that is ratiometric and proportional to acceleration.
Acceleration
systems where system integrity must be ensured over the life
of the vehicle. A fourth “plate’’ is used in the g–cell as a self–
test plate. When the user applies a logic high input to the
self–test pin, a calibrated potential is applied across the
self–test plate and the moveable plate. The resulting electrostatic force (Fe = 1/2 AV2/d2) causes the center plate to
deflect. The resultant deflection is measured by the accelerometer’s control ASIC and a proportional output voltage
results. This procedure assures that both the mechanical
(g–cell) and electronic sections of the accelerometer are
functioning.
Ratiometricity
Ratiometricity simply means that the output offset voltage
and sensitivity will scale linearly with applied supply voltage.
That is, as you increase supply voltage the sensitivity and
offset increase linearly; as supply voltage decreases, offset
and sensitivity decrease linearly. This is a key feature when
interfacing to a microcontroller or an A/D converter because
it provides system level cancellation of supply induced errors
in the analog to digital conversion process.
Status
Motorola accelerometers include fault detection circuitry
and a fault latch. The Status pin is an output from the fault
latch, OR’d with self–test, and is set high whenever one (or
more) of the following events occur:
• 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.
BASIC CONNECTIONS
Pinout Description for the Wingback Package
Figure 2. Transducer
Physical Model
Figure 3. Equivalent
Circuit Model
12
3
4
SPECIAL FEATURES
Filtering
The Motorola accelerometers contain an onboard 4–pole
switched capacitor filter. A Bessel implementation is used
because it provides a maximally flat delay response (linear
phase) thus preserving pulse shape integrity. Because the filter is realized using switched capacitor techniques, there is
no requirement for external passive components (resistors
and capacitors) to set the cut–off frequency.
Self–Test
The sensor provides a self–test feature that allows the
verification of the mechanical and electrical integrity of the
accelerometer at any time before or after installation. This
feature is critical in applications such as automotive airbag
4
5
6
Pin No.
Pin Name
Description
1
—
Leave unconnected or connect to
signal ground
2
ST
Logic input pin to initiate self test
3
VOUT
Output voltage
4
Status
Logic output pin to indicate fault
5
VSS
Signal ground
6
VDD
Supply voltage (5 V)
—
Wings
Support pins, internally connected to
lead frame. Tie to VSS.
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Motorola Sensor Device Data
Freescale Semiconductor, Inc. MMA1201P MMA2200W
4
MMA2200W
VDD
LOGIC
INPUT
2 ST
6 VDD
VOUT
C1
0.1 µF
3
STATUS
R1
1 kΩ
OUTPUT
SIGNAL
C2
0.01 µF
5 VSS
Figure 4. Wingback Accelerometer with
Recommended Connection Diagram
VDD
6
MMA1201P
LOGIC
INPUT
4 ST
8 VDD
VOUT
C1
0.1 µF
5
STATUS
R1
1 kΩ
OUTPUT
SIGNAL
C2
0.01 µF
7 VSS
Figure 5. DIP Accelerometer with Recommended
Connection Diagram
PCB Layout
N/C
1
16
N/C
N/C
2
15
N/C
N/C
3
14
N/C
ST
4
13
N/C
VOUT
5
12
N/C
STATUS
6
11
N/C
VSS
7
10
N/C
VDD
8
9
N/C
ACCELEROMETER
Pinout Description for the DIP Package
P1
ST
VOUT
VSS
VDD
P0
A/D IN
R
1 kΩ
C 0.01 µF
C 0.1 µF
VRH
C
MICROCONTROLLER
Freescale Semiconductor, Inc...
STATUS
VSS
C 0.1 µF
VDD
0.1 µF
POWER SUPPLY
Figure 6. Recommend PCB Layout for Interfacing
Accelerometer to Microcontroller
Pin No.
Pin Name
Description
1
—
Leave unconnected or connect to
signal ground.
2 thru 3
—
No internal connection. Leave
unconnected.
4
ST
Logic input pin to initiate self
test.
5
VOUT
Output voltage
6
Status
Logic output pin to indicate
fault.
7
VSS
Signal ground
8
VDD
Supply voltage (5 V)
9 thru 13
Trim Pins
14 thru 16
—
Used for factory trim. Leave
unconnected.
No internal connection. Leave
unconnected.
Motorola Sensor Device Data
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 6.
• 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.
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Freescale Semiconductor, Inc.
MMA1201P MMA2200W
Positive Acceleration Sensing Direction
DIP PACKAGE
WINGBACK PACKAGE
12
16
9
1
8
7
Freescale Semiconductor, Inc...
1
6
*
*
* When positioned as shown, the Earth’s gravity will result in a positive 1g output
Drilling Patterns
WB PACKAGE DRILLING PATTERN
.000 .090 .190 .290 .390 .490 .590 .680
.090
∅ .049 2X
.047
∅ .033 6X
.031
Measurement in inches
ORDERING INFORMATION
Device
Temperature Range
Case No.
Package
MMA1201P
–40 to +85°C
Case 648C–04
Plastic DIP
MMA2200W
–40 to +85°C
Case 456–06
Plastic Wingback
6
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Motorola Sensor Device Data
Freescale Semiconductor, Inc. MMA1201P MMA2200W
PACKAGE DIMENSIONS
A
0.005 (0.13)
J
16X
8
M
M
1
L
9
B
16
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
T B
B
A
DIM
A
B
C
D
E
F
G
J
K
L
M
N
Freescale Semiconductor, Inc...
K
C
N
F
T
E
G
16X
0.005 (0.13)
M
SEATING
PLANE
T A
CASE 648C–04
ISSUE D
DIP PACKAGE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. PLANE –X– AND PLANE –Y– SHOULD BE
ALIGNED WITHIN 0.0015”.
C
12
"
7
–Y–
–B–
6
–X–
–Y–
L
K
H
M
J
U
0.13 (0.005)
8 PL
8 PL
U
D
G
M
S
6 PL
T A
M
B
N
M
P
E
F
MILLIMETERS
MIN
MAX
18.90
19.90
6.10
6.60
3.69
4.69
0.38
0.53
1.27 BSC
1.02
1.78
2.54 BSC
0.20
0.38
2.92
3.43
7.62 BSC
0_
10_
0.39
1.01
D
–A–
1
INCHES
MIN
MAX
0.744
0.783
0.240
0.260
0.145
0.185
0.015
0.021
0.050 BSC
0.040
0.70
0.100 BSC
0.008
0.015
0.115
0.135
0.300 BSC
0_
10_
0.015
0.040
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
P
S
U
INCHES
MIN
MAX
0.618
0.638
0.240
0.260
0.127
0.133
0.015
0.021
0.328
0.368
0.112
0.120
0.100 BSC
0.050 BSC
0.009
0.012
0.125
0.140
0.063
0.070
0.015
0.025
0.036
0.044
0.110
0.120
0.025
0.035
0.088
0.108
MILLIMETERS
MIN
MAX
15.70
16.21
6.10
6.60
3.23
3.38
0.38
0.53
8.33
9.35
2.84
3.05
2.54 BSC
1.27 BSC
0.23
0.30
3.18
3.56
1.60
1.78
0.38
0.64
0.91
1.12
2.79
3.05
0.64
0.89
2.24
2.74
–T–
CASE 456–06
ISSUE H
WB PACKAGE
Motorola Sensor Device Data
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MMA1201P MMA2200W
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Mfax is a trademark of Motorola, Inc.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or
guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application
or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages.
“Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed,
intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support
or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death
may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and
hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses,
and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or
unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
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HOME PAGE: http://motorola.com/sps/
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MMA1201P/D