SCA320 Series
Accelerometer Chip
FEATURES
• Available ranges
±1.5g, ±3g, ±12g
• 8-Pin surface mount plastic DIP package
suitable for pick and place machines
• Enhanced failure detection
• Digitally activated electrostatic self test
• Calibration memory parity check
• Continuous connection failure detection
• Controlled frequency response in the sensing
element
• Bi-directional acceleration measurement
• Re-flow solder, process compatible
• Single +5V supply; ratiometric voltage output
in the range 4.75 … 5.25V
• Measuring direction perpendicular to the
assembly plane
BENEFITS
• Excellent overload and shock durability
• Stability over temperature and time
• No additional components required
APPLICATIONS
• Acceleration measurement
• Inclination measurement
• Vibration measurement
• Motion measurement
For customised products please contact
VTI HAMLIN
DIMENSIONS
The accelerometer weighs under 1.5g. The size of the part is approximately (w x h x l) 12,7 x 6,4 x 12,7 mm. Pin pitch is standard 100 mils.
12.70
5
4
ACCELERATION
DIRECTION
12.00
7
8
2
1
12.70
6
3
12.00
VTI PART
CONNECTION
1, 2, 3, 5 Open or capacitively connected to GND for EMC
(2 (C1) may be used for frequency setting in a different mode)
4 Ground (GND)
6 Self test triggering (ST)
7 Analog output voltage (Vout)
8 Supply voltage (Vdd)
Acceleration in the positive direction of the arrow perpendicular to the mounting
plane will increase the output voltage.
PCB PAD LAYOUTS
1.39
2.54±0.05
RO. 1 TYP
PRODUCT CODE KEY
PART NUMBER
ASIC TYPE
C=HML294
X
X
X
SENSITIVITY
1=2000 mV/g
2=1500 mV/g
3=1333 mV/g
4=1000 mV/g
5=750 mV/g
8=1200mV/g
C=150mV/g
D=1575mV/g
E=1666mV/g
F=1471.5mV/g
G=1875mV/g
J=400mV/g
X
X
X
MECHANICAL FEATURE
G= SMD Pins
2.2
11.85±0.05
9.65±0.05
MAX.6.40
1.77
SENSING ELEMENT
1= Small 1g; G001BA (XC)
2= Small 1g; 50Hz; G001BB
3= Small 3g; G003BA (XE)
B= Inclinometer 0.5g; G001BC (XB)
C=Small 3g; G003BC; 115Hz
D=Small 12g, G012XX (XX)
Standard versions in bold
FREQUENCY RESPONSE
1= 400Hz
2= 1kHz
3= Wide Band
4= External Capacitor
OFFSET
H= Output @ 0g = 2.500V
V= Output @ +1g = 2.500V
VTI Hamlin Oy, P.O. Box 27, FIN-01621 Vantaa, Finland
Phone +358 9 879 181, Fax +358 9 8791 8791, www.vti.fi/vtihome.htm
SCA320 Series
ABSOLUTE MAXIMUM RATINGS
Parameter
Acceleration (powered or non-powered)
Supply voltage
Voltage at input / output pins
Temperature range
Value
20000
-0.3 to +7.0
-0.3 to Vdd + 0.3
-55 to +125
Units
g
V
V
°C
ELECTRICAL CHARACTERISTICS
Parameter
Supply voltage Vdd
Current consumption
Operating temperature
Resistive output load
Capacitive load
Output noise
(9
Condition
Vdd = 5V; No load
Vout to Vdd or Vss
Vout to Vdd or Vss
DC...4kHz
- 40
20
1
Min.
4.75
2.0
Typ
Max.
5.25
4.0
+ 125
20
5
Units
V
mA
°C
kOhm
nF
mVrms
VDD = 5.00V, UNLESS OTHERWISE SPECIFIED
PERFORMANCE CHARACTERISTICS
Parameter
Measuring range
(1
Mounting plane
(2
Zero Point
(2
Sensitivity
(3
Zero Point error
(4
Condition
Nominal
SCA320-
C28H1G
±1.5
Vertical
Vdd/2
1.2
±50
(4a
±80
(4a
±120
(4a
±2
±3
±4
±20
4
50±30
±2
SCA320-
CC5V1G
±3
Horizontal
Vdd/2
0.75
±75
(4b
±130
(4b
±195
(4b
±2
±3
±4
±60
4
115±55
±2
SCA320-
CDCV1G
±12
Horizontal
Vdd/2
0.15
±450
(4b
±700
(4b
±1000
(4b
±3
±4
±5
±200
5
400±150
±2
Units
g
V
V/g
mg
mg
mg
%
%
%
mg
%
Hz
%
Sensitivity error
(4,5
Typical non-linearity
(6
Cross-axis sensitivity
(7
Frequency response
Ratiometric error
(9
@ room temperature
@ room temperature
-20...85°C
-40...125°C
@ room temperature
-20...85°C
-40...125°C
Over measuring range
-3dB point
(8
Vdd = 4.75...5.25V
VDD = 5.00V, UNLESS OTHERWISE SPECIFIED
Note 1.
Note 2.
Note 3.
Note 4.
The measuring range is limited by sensitivity, offset and supply voltage rails of the device.
The measuring direction is perpendicular to the mounting plane; zero point is defined with no acceleration and the device mounted in the prescribed mounting plane; for a
vertical mounting plane the zero point is defined with pins 1 and 8 low.
Sensitivity specified as [Vout (+1g) - Vout(-1g)] / 2 [V/g].
Room temperature and –20 … +85°C values are only typical.
Note 4a. Zero point error specified as (Vout (+0g) - Vdd/2) / Vsens [g] (room temp. error included); Vsens = Nominal sensitivity.
Note 4b. Zero point error specified as (Vout (+1g) - Vdd/2) / Vsens [g] (room temp. error included); Vsens = Nominal sensitivity.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Sensitivity error specified as {{[Vout (+1g) -Vout (-1g)] / 2} -Vsens} / Vsens x 100% [%]; Vsens = Nominal sensitivity.
Relative to the straight line between
±1g.
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 (0Hz) response.
Supply voltage noise also couples to the output, due to the ratiometric (output proportional to supply voltage) nature of the accelerometer.
Vout(@Vx) x
The ratiometric error is specified as:
RE =
100% x 1 -
5.00V
Vx
Vout(@5V)
VTI Hamlin Oy, P.O. Box 27, FIN-01621 Vantaa, Finland
Phone +358 9 879 181, Fax +358 9 8791 8791, www.vti.fi/vtihome.htm
Rev. 2 January 2001
VTI Hamlin reserves the right to modify this specification without prior notice.
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