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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

ACCELERATION

DIRECTION

12.00

12.70

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

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

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

°C

ELECTRICAL CHARACTERISTICS

Parameter

Supply voltage Vdd

Current consumption

Operating temperature

Resistive output load

Capacitive load

Output noise

Condition

Vdd = 5V; No load

Vout to Vdd or Vss

DC...4kHz

- 40

Min.

4.75

2.0

Typ

Max.

5.25

4.0

+ 125

Units

°C

kOhm

mVrms

VDD = 5.00V, UNLESS OTHERWISE SPECIFIED

PERFORMANCE CHARACTERISTICS

Parameter

Measuring range

Mounting plane

Zero Point

Sensitivity

Zero Point error

Condition

Nominal

SCA320-

C28H1G

±1.5

Vertical

Vdd/2

1.2

±50

(4a

±80

(4a

±120

(4a

±2

±3

±4

±20

50±30

±2

SCA320-

CC5V1G

±3

Horizontal

Vdd/2

0.75

±75

(4b

±130

(4b

±195

(4b

±2

±3

±4

±60

115±55

±2

SCA320-

CDCV1G

±12

Horizontal

Vdd/2

0.15

±450

(4b

±700

(4b

±1000

(4b

±3

±4

±5

±200

400±150

±2

Units

V/g

Sensitivity error

(4,5

Typical non-linearity

Cross-axis sensitivity

Frequency response

Ratiometric error

@ room temperature

-20...85°C

-40...125°C

@ room temperature

-20...85°C

-40...125°C

Over measuring range

-3dB point

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

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.