SCA3000-E01-10 - VTI Technologies

SCA3000-E01

VTI Technologies Oy PRELIMINARY - Subject to changes 1/4

www.vti.fi

Doc. Nr. 8255900A.01 Rev. A.01

INT

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

C/V

Analog

calibration

ADC

SCA3000-E01 3-AXIS ULTRA LOW POWER ACCELEROMETER

WITH DIGITAL SPI INTERFACE

Features

• 2.35 V – 3.6 V supply voltage,

1.7 – 3.6 V digital I/O voltage

• ±3 g measurement range

• SPI digital interface

• Selectable frequency response

• Ultra low power consumption

(2.5 V, 120 µA typ)

• 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-E01 is targeted to battery operated

wrist and hand-held devices. Typical

applications are but not limited

• Motion activated functions in mobile

terminals and antitheft systems

• Gaming input devices

• Inclination sensing in digital inclinometers

• Tilt compensation in electronic compass

• Hard disk protection

• Pedometers and activity monitors

Figure 1 SCA3000-E01 Block Diagram

Data Sheet

SCA3000-E01

VTI Technologies Oy PRELIMINARY - Subject to changes 2/4

www.vti.fi Doc. Nr. 8255900A.01 Rev.A.01

Performance Characteristics 1)

Typical supply range

2.35 – 2.7 V

Extended supply

range 2.7 – 3.6 V

Parameter

Condition

Min Typ 2) Max Min Typ 2) Max

Units

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 - 120 - 150 - µA

Motion Detection

mode

- 120 - 150 - µA

Acceleration range * 4) Nominal -3 - 3 - ± 3 - g

Offset calibration error * Z-axis +1g position -40 - 40 - ± 100 - mg

Offset temperature error ** 5) -40 ... +85 °C - ±0.8 - ±0.8 - mg/°C

Sensitivity * 6) - 1000 - - 1000 - 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 28 35 42 - 35 - Hz

Narrow band

measurement mode

7 9 11 - 9 - Hz

Noise ** 11) Measurement mode - 9 - 9 - mg RMS

Narrow band

measurement mode

- 5 - 5 - mg RMS

Output data rate ** Measurement mode 80 100 120 - 93 - Hz

Narrow band

measurement mode

40 50 60 - 45 - Hz

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

Narrow band

measurement mode

- 200 - 200 - ms

Output load ** - - 35 - - 35 pF

SPI clock rate ** - - 325 - - 325 kHz

* 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 = 3g.

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-E01

VTI Technologies Oy PRELIMINARY - Subject to changes 3/4

www.vti.fi Doc. Nr. 8255900A.01 Rev.A.01

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

Figure 3 Frequency response of SCA3000-E01 in Figure 4 Frequency response of SCA3000-E01 in

measurement mode narrow band measurement mode

SCA3000-E01

VTI Technologies Oy PRELIMINARY - Subject to changes 4/4

www.vti.fi Doc. Nr. 8255900A.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