Doc.Nr. 82 1178 00
Data Sheet
SCA100T-D07 2-AXIS HIGH PERFORMANCE ANALOG ACCELEROMETER
Features
Measurement range ±12g
Measurement bandwidth 400 Hz
Low noise ratiometric analog voltage outputs
Excellent bias stability over temperature and time
Digital SPI temperature output
Comprehensive failure detection features
o
True self test by deflecting the sensing
element's proof mass with electrostatic force.
o
Continuous sensing element interconnection
failure check.
o
Continuous memory parity check.
RoHS and lead free soldering process compliant
Robust design, high shock durability (20000g)
Applications
SCA100T-D07 is targeted to inertial sensing
applications with high stability and tough
environmental requirements. Typical application
include
IMU, AHRS
Avionics
UAV
Navigation and guidance instruments
Platform stabilization
Vibration monitoring
Oil & Gas surveying and drilling
Train and Rail industry
General Description
The SCA100T-D07 is a 3D-MEMS-based dual axis accelerometer that enables tactical grade performance for
Inertial Measurement Units (IMUs) operating in tough environmental conditions. The measuring axes of the
sensor are parallel to the mounting plane and orthogonal to each other. Wide measurement range and bandwidth,
low repeatable temperature behavior, low output noise, together with a very robust sensing element and
packaging design, make the SCA100T-D07 the ideal choice for challenging inertial sensing applications.
12 VDD
Sensing
element 1
Signal conditioning
and filtering
A/D conversion
11 OUT_1
10 ST_1
Self test 1
9 ST_2
Self test 2
EEPROM
calibration
memory
Temperature
Sensor
SPI interface
1 SCK
3 MISO
4 MOSI
7 CSB
Sensing
element 2
Signal conditioning
and filtering
5 OUT_2
6 GND
Figure 1. Functional block diagram
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Doc.nr. 82 1178 00
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Rev.A2
SCA100T Series
TABLE OF CONTENTS
1 Electrical Specifications .....................................................................................................3
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Absolute Maximum Ratings ................................................................................................... 3
Performance Characteristics.................................................................................................. 3
Parameter ................................................................................................................................ 3
Electrical Characteristics ....................................................................................................... 4
SPI Interface DC Characteristics............................................................................................ 4
SPI Interface AC Characteristics............................................................................................ 4
SPI Interface Timing Specifications ....................................................................................... 5
Electrical Connection.............................................................................................................. 6
Typical Performance Characteristics .................................................................................... 6
2 Functional Description .......................................................................................................9
2.1
2.2
2.3
2.4
2.5
Measuring Directions .............................................................................................................. 9
Ratiometric Output .................................................................................................................. 9
SPI Serial Interface.................................................................................................................. 9
Self Test and Failure Detection Modes ................................................................................ 12
Temperature Measurement .................................................................................................. 13
3 Application Information ....................................................................................................14
3.1
3.2
Recommended Circuit Diagrams and Printed Circuit Board Layouts ............................... 14
Recommended Printed Circuit Board Footprint ................................................................. 15
4 Mechanical Specifications and Reflow Soldering ..........................................................15
4.1
4.2
Mechanical Specifications .................................................................................................... 15
Reflow Soldering ................................................................................................................... 16
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Doc. nr. 82 1178 00
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Rev.A2
SCA100T Series
1
Electrical Specifications
The product version specific performance specifications are listed in the table SCA100T
performance characteristics below. Vdd=5.00V and ambient temperature unless otherwise
specified.
1.1
Absolute Maximum Ratings
Supply voltage
(VDD)
Voltage at input / output pins
Storage temperature
Operating temperature
Mechanical shock
-0.3 V to +5.5V
-0.3V to (VDD + 0.3V)
-55°C to +125°C
-40°C to +125°C
Drop from 1 meter onto a concrete surface
(20000g). Powered or non-powered
1.2
Performance Characteristics
1.3
Parameter
Condition
Nominal
–3dB LP
Ratiometric output
Min
(1
Typical
Max
(1
Units
g
Hz
V
LSB
mg
mg
mg
mg
V/g
LSB / g
%
%
%
mg
mg
Bits
Measuring range
Frequency response
Offset (Output at 0g)
Offset Digital Output
Offset Calibration error
Offset Temperature
Dependency
Offset Temperature
Hysteresis
Sensitivity
Sensitivity Digital Output
Sensitivity Calibration error
Sensitivity Temperature
Dependency
Linearity error
Digital Output Resolution
Output Noise Density
-12
250
Vdd/2
-45
-200
-300
-50
400
1024
+12
550
Vdd/2
45
200
300
50
-25…+85°C
-40…+125°C
-40…+125°C
0.17
70
-25…+85°C
-40…+125°C
-15…+85ºC
+25ºC
From DC...100Hz
-2
-3.5
-2
-2
-2.5
-60
-25
11
95
+2
+2
+2.5
60
25
11
120
+2
+3.5
g
/ Hz
%
%
Ratiometric error
Vdd = 4.75...5.25V
Cross-axis sensitivity
Max.
Note 1. Min/Max values are +/-3 sigma of test population
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Rev.A2
SCA100T Series
1.4
Electrical Characteristics
Parameter
Supply voltage Vdd
Current
consumption
Operating
temperature
Analog resistive
output load
Analog capacitive
output load
Start-up delay
Condition
Vdd = 5 V; No load
-40
Vout to Vdd or GND
Vout to Vdd or GND
Reset and parity check
10
20
10
Min.
4.75
Typ
5.0
4
Max.
5.25
5
+125
Units
V
mA
°C
kΩ
nF
ms
1.5
SPI Interface DC Characteristics
Parameter
Input terminal CSB
Pull up current
Input high voltage
Input low voltage
Hysteresis
Input capacitance
Conditions
Symbol
Min
Typ.
Max
Unit
V
IN
= 0 V
I
PU
V
IH
V
IL
V
HYST
C
IN
13
4
-0.3
22
35
Vdd+0.3
1
0.23*Vdd
2
A
V
V
V
pF
Input terminal MOSI, SCK
Pull down current
V
IN
= 5 V
Input high voltage
Input low voltage
Hysteresis
Input capacitance
Output terminal MISO
Output high voltage
I > -1mA
Output low voltage
Tri-state leakage
I < 1 mA
0 < V
MISO
<
Vdd
I
PD
V
IH
V
IL
V
HYST
C
IN
9
4
-0.3
17
29
Vdd+0.3
1
0.23*Vdd
2
A
V
V
V
pF
V
OH
V
OL
I
LEAK
Vdd-
0.5
5
0.5
100
V
V
pA
1.6
SPI Interface AC Characteristics
Parameter
Output load
SPI clock frequency
Internal A/D conversion time
Data transfer time
Condition
@500kHz
Min.
Typ.
Max.
1
500
Units
nF
kHz
s
s
@500kHz
150
38
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Rev.A2
SCA100T Series
1.7
SPI Interface Timing Specifications
Parameter
Terminal CSB, SCK
Time from CSB (10%)
To SCK (90%)
Time from SCK (10%)
To CSB (90%)
Terminal SCK
SCK low time
Conditions
Symbol
T
LS1
T
LS2
Load
capacitance at
MISO < 2 nF
Load
capacitance at
MISO < 2 nF
T
CL
T
CH
Min.
120
120
Typ.
Max.
Unit
ns
ns
s
s
1
SCK high time
1
Terminal MOSI, SCK
Time from changing MOSI
(10%, 90%) to SCK (90%).
Data setup time
Time from SCK (90%) to
changing MOSI (10%,90%).
Data hold time
Terminal MISO, CSB
Time from CSB (10%) to stable
MISO (10%, 90%).
Time from CSB (90%) to high
impedance state of
MISO.
Terminal MISO, SCK
Time from SCK (10%) to stable
MISO (10%, 90%).
Terminal CSB
Time between SPI cycles, CSB at
high level (90%)
When using SPI commands
RDAX, RDAY, and RWTR: Time
between SPI cycles, CSB at high
level (90%)
T
SET
T
HOL
30
ns
30
ns
Load
capacitance at
MISO < 15 pF
Load
capacitance at
MISO < 15 pF
Load
capacitance at
MISO < 15 pF
T
VAL1
T
LZ
10
100
ns
10
100
ns
T
VAL2
100
ns
T
LH
TLH
15
150
s
s
T
LS1
CSB
SCK
T
CH
T
CL
T
LS2
T
LH
T
HOL
MOSI
T
VAL1
MISO
MSB out
MSB in
DATA in
T
SET
LSB in
T
VAL2
DATA out
LSB out
T
LZ
Figure 2. Timing diagram for SPI communication
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Doc. nr. 82 1178 00
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Rev.A2
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