Data Sheet AS8310 - preliminary
12/2002
Page 1 of 6
Key Features
-
Single +5V supply
-
SOIC16 package with sensitivity in Z axis
direction
-
Ratiometric analog output
-
Accurate over a wide temperature range
40C to +125C without any compensation
-
OTP feature for factory offset and sensitivity
calibration through serial interface
-
Excellent robustness against mechanical shock
-
True self test function by deflecting the sensing
element, factory adjustable swing of self test
magnitude
-
On chip 100Hz low pass filter, adjustable by metal
mask options
-
Only one external component required
General Description
The AS8310 is a single axis, low g accelerometer with
capacitive read out based on micromachining
technology.
The sensor concept combines the advantages of
monolithic and hybrid concepts and focuses on
mature, high yield batch fabrication process modules.
The full-scale range is factory programmable from
+/- 1 g to +/- 6g.
Automotive Applications
-
Chassis stabilization
-
Inclinometer
-
Vibration sensing
-
Passenger safety systems
-
Active suspension
-
Rollover sensing
Functional Description
The AS8310 low g accelerometer is designed for
sensing single axis acceleration perpendicular to
assembly plane with very low transverse sensitivity.
The physical implementation involves a micro-
mechanical spring/mass-sensing element, which is
made from poly crystalline silicon. The movement of
this element due to acceleration is measured by the
integrated high performance capacitive position
sensing CMOS circuitry. Changes in capacitance as
low as 0.5 aF/ sqrt Hz can be resolved which results in
low signal noise.
Linearity and large bandwidth are achieved by closed
loop operation with position control of the sensing
element through electrostatic actuation. The sensing
direction is perpendicular to the IC plane (Z axis
direction).
The analog output is 1st order low pass filtered. It is
ratiometric, i.e., the output signal is proportional to
acceleration and to supply voltage. Sensitivity and
offset of the device are factory-calibrated through a
serial interface with OTP (one time programmable)
cells. Customer specific adjustments are available
upon request.
The AS8310 provides adjustable self-test capability.
This built-in self-test feature allows verification of
integrity of mechanical and electrical functionality of
the accelerometer. This feature is essential for safety
critical applications.
AS8310
Low g Accelerometer
PRELIMINARY DATA SHEET
Data Sheet AS8310 - preliminary
12/2002
Page 2 of 6
Figure 1 Block diagram of the AS8310
Package pins
Pin #
Pin Name
Description
Connection on PCB
1
ANOUT
Analog Output
Data recording device
2
ST
Self Test (active high)
open or GND if not used
3
VSS
Negative Supply Voltage (GND)
GND
4
VDD
Positive Supply Voltage
VDD
5
VSS
Negative Supply Pin for high current OTP cells
GND
6
PROG
OTP program voltage
open or VDD
when not used
7
PW1
Serial data in (factory only)
GND
8
CLK
Clock for serial data in (factory only)
VDD
9
OPC
Test Pin (factory only)
open or GND
10
TEST3
Test Pin (factory only)
open or GND
11
TEST2
Test Pin (factory only)
open or GND
12
TEST1
Test Pin (factory only)
open or GND
13
UALIM
Actuation voltage on/off (factory only)
open or VDD
14
TIPO
Test Output
open
15
RESETZ
Reset (factory only)
open or VDD
16
ZUNCL
Input for test synchronization (factory only)
open or GND
VDD
ANOUT
Sensing Element
Detector
Actuator
Gain
Offset
Filter
Actuate
VSS
Self Test
Calibration Constants
Test Pins
Test
features
Factory calibration
Data Sheet AS8310 - preliminary
12/2002
Page 3 of 6
Electrical Specifications
Specifications given hereinafter are target properties and may be subject to change during phase of product and
technology qualification.
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Supply Voltage
VDD
-0.3
7.0
V
Input Voltages for Pins
1, 2, 7 12, 14, 16
V_in
-0.3
VDD +0.3
V
Input Voltage for Pin 6
V_prog
-0.3
8.25
V
DC current into any pin I_in
-100
100
mA
Storage Temperature
T_strg
-40
+125
C
Shock resistance
40 000
g
Electrostatic Discharge
(see Note 1)
+/- 1000
V
Note 1) HBM: R=1.5kOhm, C=100pF
Data Sheet AS8310 - preliminary
12/2002
Page 4 of 6
Operating Conditions
Parameter
Symbol
Min
Typ
Max
Unit
Note
DC Supply Voltage
VDD
4.75
5.25
V
Static supply current
IDD
10
mA
5.25V @125 C
Measurement Range
1
-1.5
+1.5
g
1g = 9.81 m/s
2
Circuit ground
VSS
0.0
0.0
V
Ambient Temperature
Ta
-40
+125
C
Sensitivity
1,2
0.266 x VDD
V/g
Ratiometric to
Supply Voltage
Zero g Bias Level
1
VDD/2
V
Ratiometric to
Supply Voltage
Sensitivity Error
-2
+2
%
-40...+125C
Zero g Bias Error
-115
+115
mg
-40...+125C
Frequency Response 3dB
70
100
130
Hz
-40...+125C
Noise
4
mg
RMS
130Hz
bandwidth
Non-linearity
-1
+1
%
For +/- 1 g
Range
Cross axis sensitivity
3
%
1 ... customer specific adjustment available upon request
2 ... 1.33 V/g at VDD = 5V
Data Sheet AS8310 - preliminary
12/2002
Page 5 of 6
Package Information
Figure 2 Packaging AS8310 physical dimensions of SOIC 16 package
Dimension
Min
Max
Min
Max
Unit
mm
inch
A
2.946
3.200
0.116
0.126
A1
0.102
0.229
0.004
0.009
B
0.356
0.457
0.014
0.018
C
0.254
0.305
0.010
0.012
D
10.160
10.414
0.400
0.41
E
7.391
7.595
0.291
0.299
e
1.27
0.05
H
10.16
10.414
0.400
0.41
h
0.508
0.711
0.020
0.028
L
0.406
1.016
0.016
0.04
M
0
7
0
7
Data Sheet AS8310 - preliminary
12/2002
Page 6 of 6
Contact
austriamicrosystems AG
A 8141 Schloss Premsttten, Austria
T. +43 (0) 3136 500 5818
F. +43 (0) 3136 500 5811
drive@austriamicrosystems.com
www.austriamicrosystems.com
Copyright
Copyright 2001 austriamicrosystems. Trademarks registered . All rights reserved. The material herein may not be
reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. To
the best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accurate
and correct.
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