SCA3000-E04 - Murata Electronics North America

SCA3000-E04

VTI Technologies Oy 1/4

www.vti.fi

Doc. Nr. 8290500B.0 Rev. B.0

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-E04 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

• ±6 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-E04 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

• Pedometers and activity monitors

Figure 1 SCA3000-E04 Block Diagram

Data Sheet

SCA3000-E04

VTI Technologies Oy 2/4

www.vti.fi Doc. Nr. 8290500B.0 Rev.B.0

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 12 - <9 - µA

Active - 120 145 - 150 - µA

Motion Detection

mode

- 120 145 - 150 - µA

Acceleration range * 4) Nominal -6 - 6 - ± 6 - g

Offset calibration error * Z-axis +1g position -80 - 80 - ± 200 - mg

Offset temperature error ** 5) -40 ... +85 °C -9 ±1.6 9 - ±1.6 - mg/°C

Sensitivity * 6) - 500 - - 500 - Count/g

Sensitivity calibration error * -3 - +3 - ± 3 - %

Sensitivity temperature error

** 7)

-40 ... +85 °C -0.05 ±0.015 0.05 - ±0.015 - %/°C

Non-Linearity ** 8) -3 ±1 3 - ±1 - % FS

Cross-Axis sensitivity ** 9) - ±4 - - ±4 - %

Bandwidth ** 10) Measurement mode 30 38 46 - 38 - Hz

Narrow band

measurement mode

7 9 11 - 9 - Hz

Wide band

measurement mode

50 70 100 - 70 - Hz

Noise ** 11) Measurement mode - 18 36 - 18 - mg RMS

Narrow band

measurement mode

- 10 20 - 10 - mg RMS

Wide band

measurement mode

- 30 60 - 30 - mg RMS

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

Narrow band

measurement mode

40 50 60 - 45 - Hz

Wide band

measurement mode

320 400 480 - 400 - Hz

Turn on time ** 12) Measurement mode - 35 70 - 35 - ms

Narrow band

measurement mode

- 200 400 - 200 - ms

Wide band

measurement mode

- 20 40 - 20 - 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 = 6g.

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) Best fit straight line.

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, Figure 4 and Figure 5.

SCA3000-E04

VTI Technologies Oy 3/4

www.vti.fi Doc. Nr. 8290500B.0 Rev.B.0

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.

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

Figure 3 Frequency response of SCA3000-E04 in Figure 4 Frequency response of SCA3000-E04 in

measurement mode narrow band measurement mode

Figure 5 Frequency response of SCA3000-E04 in

wide band measurement mode

SCA3000-E04

VTI Technologies Oy 4/4

www.vti.fi Doc. Nr. 8290500B.0 Rev.B.0

Figure 6 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

0.3 21-Apr-06 New template

0.4 13-Jun-06 Dimensions updated

0.5 01-Sep-06 Bandwidth in measurement mode, definition and value of non-linearity, cross axis

sensitivity updated

Figures 3 and 4 updated

A 15-Sep-06 First official release. Typos corrected.

A.01 26-Oct-06 Wide band mode added.

A.02 04-Jan-07 Wide band mode noise and turn-on time added.

A.03 31-Oct-07 Figure 2 updated

B 28-Aug-08 Performance characteristics updated