Accelerometer SCA1000 Series - VTI Technologies - (Version JPG) - PDF Catalogue | Technical Documentation

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Gyroscope, Sensor, Tilt sensor, MEMS, Accelerometer

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Preliminary

SCA1000 and SCA1020 Series

Accelerometer

FEATURES

• 2-axis measurement: SCA1000 for X - Y measurement and SCA1020 for Z - Y measurement

• Available range ±1.7 g

• Interchangeable with SCA610/SCA620 (see interchangeability drawing below)

• Over damped sensing element to control frequency response

• SMD DIL-12 lead-free component

• Compatible with lead-free reflow soldering process

• Advanced internal and external connection failure detection

• Digitally activated electrostatic self-test

• Continuous memory parity check

• Single +5 V supply; two ratiometric analog voltage outputs

• Serial Peripheral Interface (SPI) compatible digital output (11 bits)

• Internal temperature sensor, accessible via SPI

BENEFITS

• Excellent reliability and stability over time and temperature

• High resolution and low noise

• Wide operating temperature range

• Outstanding overload and shock durability

APPLICATIONS

• 2-axis acceleration measurements

• 2-axis platform leveling

• Inclination based position measurement

• 360 ° vertical orientation measurement

For customized product, please contact VTI Technologies


ELECTRICAL CHARACTERISTICS
Parameter	Condition	Min	Typ.	Max	Units
Supply voltage Vdd "		4.75	5.0	5.25	V
Current consumption	Vdd = 5 V; No load			5	mA
Analog resistive output load	Vout to Vdd or Vss	10			kOhm
Analog capacitive output load				20	nF
Digital output load	@ 500 kHz			1	nF
SPI clock frequency				500	kHz
AD conversion time			150		lis
Data transfer time	@500 kHz clock		38		lis

PERFORMANCE CHARACTERISTICS


Parameter	Condition	SCA1000-D01	SCA1020-D02	Units
Measuring range ⁽²	Nominal	±1.7	±1.7	g
Measuring direction relative to mounting plane "²	See note 12.	"X"= parellel "Y" =parallel	"Z"= perpendicular "Y"= parallel
Zero point ^a'²	Mounting position	Vdd/2	Vdd/2	V
Sensitivity ^(4K	@ room temperature	1.2	1.2	V/g
Zero point error over temperature ⁽⁵	-25...85 °C typical	± 70	± 70	mg
	-40...125 °C	±100	±100	mg
Sensitivity error over temperature ⁽⁶	-25...85 °C typical	±3	±3%
	-40.125 °C	±4	±4%
Typical non-linearity ⁰	Over measuring range	±20	±20	mg
Cross-axis sensitivity "°	@ room temperature	3.5	3.5	%
Frequency response -3dB ⁽⁸	@ -40...125 °C	50±30 Hz	50±30 Hz	Hz
Ratiometric error ^(s	Vdd = 4.75...5.25 V	2	2	%
Output noise density ⁽"	From DC...100 Hz	80	80	lig/VHz
Digital output resolution	FS	11	11	Bits

VDD = 5.00V, UNLESS OTHERWISE SPECIFIED

5.00V~\

Note 1 100 nF supply by-pass capacitor is needed.

Note 2 Measuring directions in parallel to mounting plane, arrows showing positive acceleration direction.

Note 3 Zero point specified as Voffset = Vout(0 g) [ V ]. See note 12.

Note 4 Sensitivity specified as Vsens = {Vout(+1 g) - Vout(-1 g)}/2 [ V/g ]. See note 12.

Note 5 Zero point error specified as Zero point error = {Vout(0 g) - Vdd/2} / Vsens [ g ] VSens =

Nominal sensitivity Vdd/2 = Nominal offset. Note 6 Sensitivity error specified as Sensitivity error = { [Vout(+1 g)-Vout(-1 g)] / 2 - Vsens_nom} /

Vsens_nom x 100 % [% ] Vsens_nom = nominal sensitivity See note 12. Note 7 From straight line through +1 g and -1 g points. Note 8 The output has true DC (0 Hz) response.

VouT(@Vx) x

The ratiometric error is specified as: RE = 100% x

Note 9

Vout(@5V)

Note 10

The cross-axis sensitivity determines how much acceleration, perpendicular to the measuring axis, couples to the output. The total crossaxis sensitivity is the geometric sum of the sensitivities of the two axis which are perpendicular to the measuring axis. The angular alignment error between channels 1 and 2 is included into the cross axis error Typical figure. In addition, supply voltage noise couples to the output due to the ratiometric nature of the accelerometer. Measuring directions.

Note T

Note 12

VTI^

Rev. 18 Jan 2005 VTI Technologies reserves the right to modify this specification without prior to notice. TECHNOLOGIES

Accelerometer SCA1000 Series - VTI Technologies - #1

Gyroscope, Sensor, Tilt sensor, MEMS, Accelerometer