Document Number: MMA81XXEG
Freescale Semiconductor
Rev 5, 04/2010
Technical Data
Digital X-Axis or Z-Axis
MMA81XXEG
Accelerometer
MMA82XXEG
The MMA81XXEG (Z-axis) and MMA82XXEG/MMA82XXTEG (X-axis) are
members of Freescales family of DSI 2.0-compatible accelerometers. These
MMA82XXTEG
devices incorporate digital signal processing for filtering, trim and data
SERIES
formatting.
Features
SINGLE-AXIS
Available in 20g, 40g, 150g, and 250g (MMA82XXEG, X-axis),
DSI 2.0
50g and 100g (MMA82XXTEG, X-axis) and 40g, 100g, 150g, and
ACCELEROMETER
250g (MMA81XXEG, Z-axis). Additional g-ranges may be available upon
request
80 customer-accessible OTP bits
10-bit digital data output from 8 to 10 bit DSI output
6.3 to 30 V supply voltage
On-chip voltage regulator
Internal self-test EG SUFFIX (Pb-free)
16-LEAD SOIC
Minimal external component requirements
CASE 475-01
RoHS compliant (-40 to +125C) 16-pin SOIC package
Automotive AEC-Q100 qualified
DSI 2.0 Compliant
PIN CONNECTIONS
Z-axis transducer is overdamped
Typical Applications
N/C116 V
SS
N/C215 V
Crash detection (Airbag) SS
C 314 BUSRTN
REG
Impact and vibration monitoring
V /TEST413 BUSIN
PP
Shock detection.
C 512 BUSOUT
FIL
D 611 H
OUT CAP
V /D 710 V
GND IN SS
CLK89 C
REG
16-PIN SOIC PACKAGE
Freescale Semiconductor, Inc., 2009, 2010. All rights reserved.ORDERING INFORMATION
Device Name X-axis g-Level Z-axis g-Level Temperature Range SOIC 16 Package Packaging
MMA8225EGR2 250 -40 to +125C 475-01 Tape & Reel
MMA8225EG 250 -40 to +125C 475-01 Tubes
MMA8215EGR2 150 -40 to +125C 475-01 Tape & Reel
MMA8215EG 150 -40 to +125C 475-01 Tubes
MMA8210TEGR2 100 -40 to +125C 475-01 Tape & Reel
MMA8210TEG 100 -40 to +125C 475-01 Tubes
MMA8205TEGR2 50 -40 to +125C 475-01 Tape & Reel
MMA8205TEG 50 -40 to +125C 475-01 Tubes
MMA8204EGR2 40 -40 to +125C 475-01 Tape & Reel
MMA8204EG 40 -40 to +125C 475-01 Tubes
MMA8202EGR2 20 -40 to +125C 475-01 Tape & Reel
MMA8202EG 20 -40 to +125C 475-01 Tubes
MMA8125EGR2 250 -40 to +125C 475-01 Tape & Reel
MMA8125EG 250 -40 to +125C 475-01 Tubes
MMA8115EGR2 150 -40 to +125C 475-01 Tape & Reel
MMA8115EG 150 -40 to +125C 475-01 Tubes
MMA8110EGR2 100 -40 to +125C 475-01 Tape & Reel
MMA8110EG 100 -40 to +125C 475-01 Tubes
MMA8104EGR2 40 -40 to +125C 475-01 Tape & Reel
MMA8104EG 40 -40 to +125C 475-01 Tubes
SECTION 1 GENERAL DESCRIPTION
MMA81XXEG/MMA82XXEG/MMA82XXTEG family is a satellite accelerometer which is comprised of a single axis, variable ca-
pacitance sensing element with a single channel interface IC. The interface IC converts the analog signal to a digital format which
is transmitted in accordance with the DSI-2.0 specification.
1.1 OVERVIEW
Signal conditioning begins with a Capacitance to Voltage conversion (C to V) followed by a 2-stage switched capacitor amplifier.
This amplifier has adjustable offset and gain trimming and is followed by a low-pass switched capacitor filter with Bessel function.
Offset and gain of the interface IC are trimmed during the manufacturing process. Following the filter the signal passes to the
output stage. The output stage sensitivity incorporates temperature compensation.
The output of the accelerometer signal conditioning is converted to a digital signal by an A/D converter. After this conversion the
resultant digital word is converted to a serial data stream which may be transmitted via the DSI bus. Power for the device is
derived from voltage applied to the BUSIN/BUSOUT and V pins. Bus voltage is rectified and applied to an external capacitor
SS
connected to the H pin. During data transmissions, the device operates from stored charge on the external capacitor. An
CAP
integrated regulator supplies fixed voltage to internal circuitry.
A self-test voltage may be applied to the electrostatic deflection plate in the sensing element. Self-Test voltage is factory trimmed.
Other support circuits include a bandgap voltage reference for the bias sources and the self-test voltage.
A total of 128 bits of One-Time Programmable (OTP) memory, are provided for storage of factory trim data, serial number and
device characteristics. Eighty OTP bits are available for customer programming. These eighty OTP bits may be programmed via
the DSI Bus or through the serial test/trim interface. OTP integrity is verified through continuous parity checking. Separate parity
bits are provided for factory and customer programmed data. In the event that a parity fault is detected, the reserved value of
zero is transmitted in response to a Read Acceleration Data command.
A block diagram illustrating the major elements of the device is shown in Figure 1-1.
MMA81XXEG
Sensors
2 Freescale Semiconductor