SCA3000-D01-10 - VTI Technologies

SCA3000-D01

VTI Technologies Oy PRELIMINARY - Subject to changes 1/4

www.vti.fi Doc.nr. 8255700A.01 Rev.A.01

INT

C/V

Analog

calibration

ADC

DE-

MUX

1:3

Low-pass

Filter

Low-pass

Filter

Low-pass

Filter

Decimation

Coordinate

Mapping

and

Calibration

Oscillator

clock

Motion

detector

Free fall

detector

Non-

Volatile

Memor

Reference

SPI

i/f

Control

INT

SCK

MISO

MOSI

CSB

Ring

Buffer

Temperature

sensor

SCA3000-D01 3-AXIS LOW POWER ACCELEROMETER

WITH DIGITAL SPI INTERFACE

Features

• 2.35 V – 3.6 V supply voltage,

1.7 V – 3.6 V digital I/O voltage

• ±2 g measurement range

• SPI digital interface

• Selectable frequency response

• Very low current consumption

(2.5 V, 480 µA typ)

• Temperature output

• 64 samples/axis buffer memory for output

acceleration data and advanced features

enable significant power and resource savings

at system level

• Interrupt signal triggered by motion and free

fall

• Size 7x7x1.8 mm

• Proven capacitive 3D-MEMS technology

• High shock durability

• RoHS compliant / lead free soldering

Applications

SCA3000-D01 is targeted to battery operated

devices. Typical applications are but not limited

• Motion activated functions in mobile

terminals and antitheft systems

• Inertial navigation

• Inclination sensing in digital inclinometers

• Tilt compensation in electronic compass

Figure 1 SCA3000-D01 Block Diagram

Data Sheet

SCA3000-D01

VTI Technologies Oy PRELIMINARY- Subject to changes 2/4

www.vti.fi Doc. Nr. 8255700A.01 Rev.A.01

Performance Characteristics 1)

Typical supply range

2.35 – 2.7 V

Extended supply

range 2.7 – 3.6 V

Units Parameter

Condition

Min Typ 2) Max Min Typ 2) Max

Analog and digital Vdd 2.35 2.5 2.7 - 3.3 - V

Digital I/O Vdd Vdd ≥ Digital I/O Vdd 1.7 1.8 / 2.5 2.7 - 3.3 - V

Operating temperature ** -40 - 85 -40 - 85 °C

Current consumption * Reset 3) - <7 - <9 - µA

Active - 480 - 650 - µA

Motion Detection

mode

- 300 - 400 - µA

Acceleration range * 4) Nominal -2 - 2 - ± 2 - g

Offset calibration error * Z-axis +1g position -20 - 20 - ± 50 - mg

Offset temperature error ** 5) -40 ... +85 °C - ±0.5 - ±0.5 - mg/°C

Sensitivity * 6) - 1333 - - 1333 - Count/g

Sensitivity calibration error * -1 - +1 - ± 1 - %

Sensitivity temperature error

** 7)

-40 ... +85 °C - ±0.01 - ±0.01 - %/°C

Non-Linearity ** 8) - ±1 - ±1 - % FS

Cross-Axis sensitivity ** 9) - ±3 - - ±3 - %

Bandwidth ** 10) Measurement mode 36 45 54 - 45 - Hz

Bypass measurement

mode

56 70 84 - 70 - Hz

Noise ** 11) Measurement mode - 3 - 3 - mg RMS

Bypass measurement

mode

- 5 - 5 - mg RMS

Output data rate ** 200 250 300 - 260 - Hz

Temperature output T=+23 °C 256 - 256 - Count

Sensitivity 1.8 - 1.8 - Count/°C

Turn on time ** 12) Measurement mode - 35 - 35 - ms

Bypass measurement

mode

- 35 - 35 - ms

Output load ** - - 35 - - 35 pF

SPI clock rate ** - - 1.6 - - 1.6 MHz

* 100% tested in production

** Qualified during product validation

1) The product is factory calibrated at 2.5 V in room temperature.

2) Typical values are not guaranteed.

3) Includes the current through the internal 400 kΩ pull-up resistor connected to digital I/O Vdd.

4) Range defined as g

2≤++ . The measuring range is tested on sensing element level. FS = 2g.

5) Offset temperature error = {Count(0g)-Offset} / Sensitivity [ g ]. Sensitivity = Calibrated sensitivity.

Offset= Calibrated offset.

6) Sensitivity = {Count(+1g) - Count(-1g)}/2 [Count/g].

7) Sensitivity temperature error = {[Count(+1g)-Count(-1g)]/2 - Sensitivity} / Sensitivity x 100% [%].

Sensitivity = Calibrated sensitivity.

8) From straight line through sensitivity calibration (+1g, -1g) points.

9) 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 angular alignment error

between X, Y and Z axis is included into the cross axis sensitivity.

10) Frequency responses according to Figure 3 and Figure 4.

11) Average noise/axis over the measurement bandwidth defined as )

(

n++ , where nx, ny and nz are

the measured signal's standard deviation due to noise in x, y and z directions.

12) Settling error less than 1% of FS.

SCA3000-D01

VTI Technologies Oy PRELIMINARY- Subject to changes 3/4

www.vti.fi Doc. Nr. 8255700A.01 Rev.A.01

Figure 2 Sensing directions and package dimensions in mm with ±50 µm tolerance.

Figure 3 Frequency response of SCA3000-D01 in Figure 4 Frequency response of SCA3000-D01 in

measurement mode bypass measurement mode

SCA3000-D01

VTI Technologies Oy PRELIMINARY- Subject to changes 4/4

www.vti.fi Doc. Nr. 8255700A.01 Rev.A.01

Figure 5 Application schematic

Pin # Name Function

1 NC Not connected

2 XRESET External reset, active low

3 INT Interrupt output

4 CLK Digital ground

5 DVSS Digital ground

6 DVDD Digital supply

7 DVIO Digital I/O supply

8 CSB Chip select

9 NC Not connected

10 NC Not connected

11 SCK_SCL SPI serial clock (SCK)

12 MISO_SDA SPI data out (MISO)

13 MOSI SPI data in (MOSI)

14 AVDD Analog supply

15 AVSS Analog ground

16 AVSS Analog ground

17 ATSTIO Not connected

18 NC Not connected

Table 1 Pin descriptions

Document Change Control

Rev. Date Change Description

A 21-Apr-06 1st official release

A.01 13-Jun-06 Dimensions updated