SCA620 Series
Accelerometer
FEATURES
• Available ranges ±1.7 g
• 8-pin plastic surface mount DIP package mountable
with pick and place machines
• Enhanced failure detection
• Digitally activated electrostatic self test
• Calibration memory parity check
• Continuous connection failure detection
• Bi-directional acceleration measurement
• Controlled frequency response in the sensing element
• Re-flow solderable, process compatible
• Single +5 V supply; ratiometric voltage output in the
range 4.75 … 5.25 V
BENEFITS
• Exceptional reliability, unprecedented accuracy and
excellent stability over temperature and time
• Outstanding overload and shock durability
• No additional components required
APPLICATIONS
• Acceleration measurement
• Inclination measurement
• Motion measurement
• Vibration measurement
For customised product please contact
VTI Technologies
ELECTRICAL CHARACTERISTICS
Parameter
Condition
Supply voltage Vdd
Current consumption
Typ.
Max.
4.75
Vdd = 5 V; No load
Operating temperature
Resistive output load
Min.
2.0
- 40 +
Vout to Vdd or Vss
Capacitive load
Vout to Vdd or Vss
Output noise (1
DC...80 kHz
Units
5.25
V
4.0
mA
125
°C
20
kOhm
20
nF
0.25
mg
PERFORMANCE CHARACTERISTICS
Parameter
Condition/
Comment
Measuring range (2
Nominal
Measuring direction (3
SCA620CF8H1A
Units
±1.7
g
Horizontal
Zero point (nom.) (4
Mounting position
Vdd/2
V
Sensitivity
@ room temperature
1.2 (5
V/g
Zero point error (6
-40...125 °C
±125
mg
Zero point tempco (7
-25...85 °C
0.3±0.6
mg/°C
Sensitivity error
-40...125 °C
-25...85 °C
Typical non-linearity (7
Over measuring range
±4 (8
±3 (8
±40 (9
%
Sensitivity error (7
5
%
Frequency response
-3 dB point (11
50±30
Hz
Ratiometric error (12
Vdd = 4.75...5.25 V
2
%
Cross-axis sensitivity (10
%
mg
VDD = 5.00 V, UNLESS OTHERWISE SPECIFIED
Note 1
Note 2
Note 3
Note 4
Note 5a
Note 6
Note 7
Note 8
Rev. 26 Aug 2004
The noise density of CF8H1A is 20 µg/ Hz.
The measuring range is limited by sensitivity, offset and supply voltage rails of the device.
Measuring direction perpendicular to the mounting plane.
Vertical versions in +1 g position pins down, horizontal versions leg row 1-4 pointing downwards.
Sensitivity specified as [Vout (+1 g) - Vout(-1g)] / 2 [V/g] .
Zero point error specified as (Vout (+0 g) - Vdd/2) / Vsens [g] (room temp. error included);
Vsens = Nominal sensitivity.
Typical tolerance, not 100 % tested.
Sensitivity error specified as {{[Vout (+1 g) -Vout (-1 g)] / 2} -Vsens} / Vsens x 100 % [%] (room
temp. error included); Vsens = Nominal sensitivity.
VTI Technologies reserves the right to modify this specification without prior to notice.
Note 9
Note 10
Note 11
Note 12
Relative to straight line between ±1 g.
The cross-axis sensitivity determines how much acceleration, perpendicular to the
measuring axis, couples to the output. The total cross-axis sensitivity is the geometric sum
of the sensitivities of the two axes, which are perpendicular to the measuring axis.
The output has true DC (0 Hz) response.
Supply voltage noise also couples to the output, due to the ratiometric (output proportional
to supply voltage) nature of the accelerometer.
The ratiometric error is specified as:
RE = 100% x 1-
Vout(@Vx) x 5.00V
Vx
Vout(@5V)
SCA620 Series
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Acceleration (powered or non-powered)
20000
Units
g
Supply voltage
-0.3 to +7.0
V
Voltage at input / output pins
-0.3 to Vdd + 0.3
V
Temperature range
-55 to + 125
ºC
ELECTRICAL CONNECTION
Pin#
RECOMMENDED CIRCUIT
Pin Name Connection
1
Open or capacitively connected to GND for EMC*)
2
Open or capacitively connected to GND for EMC*)
3
Open or capacitively connected to GND for EMC*)
4
GND
Negative supply voltage (VSS)
6
ST
Self-test control
7
VOUT
Sensor analog output
8
VDD
Positive supply voltage (VDD)
5
Open or capacitively connected to GND for EMC*)
*) recommended capacity min. 20 pF – Effectiveness should be tested and if necessary
adapted in the respective connection.
DIMENSIONS
PCB PAD LAYOUTS
The accelerometer weighs under 1 g.
The size of the part is approximately (w x h x l) 9 x 5 x 11 mm. Pin pitch is standard 100 mils.
+
VTI PART
10.48
8
7
6
5
3
4
5.08
SCA620
1
2
11.31
8.38
SENSING DIRECTION
PART NUMBER
SERIAL NUMBER
3.03
Acceleration in the direction of the arrow
will increase the output voltage.
VTI Technologies Oy
Myllynkivenkuja 6
P.O. Box 27
FI-01621 Vantaa
Finland
Tel. +358 9 879 181
Fax +358 9 879 18791
sales@vti.fi
VTI Technologies Oy
Frankfurt Branch
Rennbahnstr. 72-74
D-60528 Frankfurt am Main
Germany
Tel. +49 69 6786 880
Fax +49 69 6786 8829
sales.de@vti.fi
VTI Technologies, Inc.
One Park Lane Blvd.
Suite 804 - East Tower
Dearborn, MI 48126
USA
Tel. +1 313 425 0850
Fax +1 313 425 0860
[email protected]