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XMMAS250G Datasheet, PDF (1/4 Pages) Motorola, Inc – MICROMACHINED ACCELEROMETER ±250g AMPLIFIED | |||
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Preliminary Information
Micromachined Accelerometer
±250g Amplified
The MMAS250G family of silicon capacitive, microâmachined accelerome-
ters features integral signal amplification, signal conditioning, a 4âpole
lowâpass filter and temperature compensation. ZeroâG offset, full scale span
and filter rollâoff are factory set and require no external passives. A calibrated
selfâtest feature mechanically displaces the seismic mass with the application
of a digital selfâtest signal. The device is offered in either of two plastic
packages, thereby accommodating various axis orientation requirements.
The MMAS250G incorporates a single polysilicon seismic mass, suspended
between two fixed polysilicon plates (Gâcell). The forces of acceleration move
the seismic mass, thereby resulting in a change in capacitance. The Gâcell is
sealed at the die level, creating a particleâfree environment. The Gâcell
features builtâin damping and overârange stops to protect it from mechanical
shock.
MMAS250G accelerometers are ideally suited for automotive crash detection
and recording, vibration monitoring, automotive suspension control, appliance
control systems, etc.
Features
⢠Full Scale Measurement ± 250g
⢠Calibrated, True SelfâTest
⢠Standard 16âPin Plastic DIP
⢠Integral Signal Conditioning and 4âPole Filter
⢠Linear Output
⢠Robust, High Shock Survivability
SIMPLIFIED BLOCK DIAGRAM
+
+
4 SELFâTEST
8 VS
+
g
GâCELL
A
6 BYPASS
Order this document
by XMMAS250G/D
XMMAS250G10D
XMMAS250G10S
MICROMACHINED
ACCELEROMETER
± 250g AMPLIFIED
DIP PACKAGE
CASE 648Câ03
SIP PACKAGE
CASE 447â01
PIN NUMBER
1 N/C (1)
9 N/C (1)
2 N/C (1)
10 N/C (1)
3 N/C (1)
11 N/C (1)
4 SelfâTest
12 N/C (1)
5 Output
13 N/C (1)
6 Bypass (2)
14 N/C (1)
7 GND
15 N/C (1)
8 VS (2)
16 N/C (1)
NOTES:
1. Internal connections. All N/C must
remain floating, except DIPâs pin
11 which must be tied to pin 8.
2. Bypass to ground with 0.1 µF ceramic
capacitor to improve noise performance.
LOWâPASS FILTER
TEMPERATURE
COMPENSATION
5 OUTPUT
7 GND
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
©MMoottoororolal,aInSc.e1n9s95or Device Data
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