Document Number: MMA6222EG
Rev 1, 10/2008
Freescale Semiconductor
Technical Data
© Freescale Semiconductor, Inc., 2008. All rights reserved.
Digital Dual Axis Micromachined
Accelerometer
The MMA62XXEG is a two-axis member of Freescale’s family of
SPI-compatible accelerometers. These devices incorporate digital signal
processing for filtering, trim and data formatting.
Features
Available in ±20/20g, ±50/50g, or ±100/100g versions. Additional g-ranges
between 20 and 100g may be available upon request
Full-scale range is independently specified for each axis
400 Hz low-pass filter, 0.1 Hz high-pass filter, 4-pole, 16 μs sample time,
additional filter options are available
Ratiometric analog voltage output
10-bit digital signed data output
SPI-compatible serial interface
Capture/hold input for system-wide synchronization support
3.3 or 5 V single supply operation
On-chip temperature sensor and voltage regulator
Bidirectional internal self-test
Minimal external component requirements
Pb-free 20-pin SOIC package
Automotive AEC-Q100 qualified
Typical Applications
Crash detection (Airbag)
Impact and vibration monitoring
Shock detection
ORDERING INFORMATION
Device Name X-Axis g-Level Y-Axis g-Level
Temperature
Range
Package Packaging
MMA6222EG 20 20 -40 to +105°C 475A-02 Tubes
MMA6222EGR2 20 20 -40 to +105°C 475A-02 Tape & Reel
MMA6255EG 50 50 -40 to +105°C 475A-02 Tubes
MMA6255EGR2 50 50 -40 to +105°C 475A-02 Tape & Reel
MMA621010EG 100 100 -40 to +105°C 475A-02 Tubes
MMA621010EGR2 100 100 -40 to +105°C 475A-02 Tape & Reel
MMA6222EG
MMA6255EG
MMA621010EG
2-AXIS
SPI-COMPATIBLE
ACCELEROMETER
EG SUFFIX (Pb-free)
20-LEAD SOIC
CASE 475A-02
PIN CONNECTIONS
1
16
2
15
3
14
4
13
5
12
6
11
7
20
8
19
N/C
V
SS
N/C
V
CC
X
OUT
N/C
V
PP
V
SSA
CAP/HOLD
SCLK
C
REGA
20-PIN SOIC PACKAGE
9
10
18
17
Y
OUT
D
IN
C
REG
CS/RESET
D
OUT
C
REF
C
REF
C
REGA
N/C
N/C: NO INTERNAL CONNECTION
MMA6222EG
Sensors
2 Freescale Semiconductor
Figure 1-1 Simplified Airbag Application Diagram
1.1 INTRODUCTION
The MMA62XXEG is intended for applications which utilize serial communications as the primary data transfer mechanism. In
addition, an analog output with lower accuracy is available.
Device serial number, acceleration range, filter characteristics and status information are available along with acceleration data
via the SPI interface. A pair of digital-to-analog converters is enabled to provide ratiometric voltage outputs in addition to the dig-
ital acceleration value accessible via the SPI.
1
μ
F100 nF 1
μ
F
V
CC
MMA62XXEG
V
CC
C
REG
C
REGA
V
SS
V
PP
/TEST
CS
SCLK
DI
DO
CS_A
SCLK1
MOSI1
Main MCU
MISO1
CS_D
SCLK2
MOSI2
MISO2
CS
SCLK
DI
DO
Deployment IC
V
SSA
C
REF
100 nF
XOUT
YOUT
ADC
Safing
Sensor(s)
/
Comparator
Filter
DEPLOY_EN1
DEPLOY_EN2
Note: If one axis of the MMA62XXEG sensor is expected to be used as a confirmation of the other axis, Freescale
recommends that MMA62XXEG used in conjunction with an additional sensing/safing device for each axis.
MMA6222EG
Sensors
Freescale Semiconductor 3
1.2 BLOCK DIAGRAM
A block diagram illustrating the major components of the design is shown in Figure 1-2.
Figure 1-2 MMA62XXEG Block Diagram
Figure 1-3 MMA62XXEG DSP Block Diagram
NOTE: Models of signal chain are available upon request.
SPI
V
CC
V
SS
D
IN
D
OUT
SCLK
CS
SELF-TEST
C
REG
C
REF
V
PP
X
OUT
INTERFACE
TEMP.
SENSOR
SD
CONVERTER
VOLTAGE
REGULATOR
g-CELL
(Y)
g-CELL
(X)
CONTROL
LOGIC
UNIT
DATA ARRAY
PROGRAMMABLE
SD
CONVERTER
CLOCK
INTERNAL
MONITOR
C
REGA
CAP/HOLD
DAC
Y
OUT
Y IN
X IN
DIGITAL
Y OUT
X OUT
DSP
TEMP
(SEE
FIGURE 1-2
)
OUT
CONTROL
IN
STATUS
OUT
DAC
C
REF
C
REGA
V
SSA
CLOCK
PRIMARY
OSCILLATOR
REFERENCE
OSCILLATOR
SINC
FILTER
SINC
FILTER
OFFSET,
Y IN
HIGH-PASS
FILTER
LOW-PASS
FILTER
TO X DAC
GAIN,
LINEARITY
ADJUST
OUTPUT
SCALING
OUTPUT
SCALING
DSP
CONTROL
TO Y DAC
DIGITAL
OUT
X IN
TEMP
CONTROL
IN
OFFSET
MONITOR
OUT

MMA6222EG

Mfr. #:
Manufacturer:
NXP / Freescale
Description:
Accelerometers XY 20 / 20 DIGITAL
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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