SCA100T

SCA100T MURATA | Alldatasheet

Document overview

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Technical content

Features

 Dual axis inclination measurement (X and Y)  Measuring ranges ±30° SCA100T-D01 and ± 90° SCA100T-D02  0.0035° resolution (10 Hz BW, analog output)  Sensing element controlled over damped frequency response (-3dB 18Hz)  Robust design, high shock durability (20000g)  High stability over temperature and time  Single +5 V supply  Ratiometric analog voltage outputs  Digital SPI inclination and temperature output  Comprehensive failure detection features o True self test by deflecting the sensing elements’ proof mass by electrostatic force. o Continuous sensing element interconnection failure check. o Continuous memory parity check.  RoHS compliant  Compatible with Pb-free reflow solder process

Applications

 Platform leveling and stabilization  360° vertical orientation measurement  Leveling instruments  Construction levels Figure 1. Functional block diagram

Murata Electronics Oy Subject to changes 2/17 TABLE OF CONTENTS

Murata Electronics Oy Subject to changes 3/17

1 Electrical Specifications

The SCA100T product family comprises two versions, the SCA100T -D01 and the SCA100T -D02 that differ in measurement range. The product version specific performance specifications are listed in the table SCA100T performance characteristics below. All other specifications are common with both versions. Vdd=5.00V and ambient temperature unless otherwise specified.

1.1 Absolute Maximum Ratings

Supply voltage (VDD) Voltage at input / output pins Storage temperature Operating temperature Mechanical shock ESD Protection: -Human Body Model -Charge Device Model Cleaning -0.3 V to +5.5V -0.3V to (VDD + 0.3V) -55°C to +125°C -40°C to +125°C Drop from 1 meter onto a concrete surface (20000g). Powered or non-powered ±2 kV ±500 V Ultrasonic cleaning not allowed

1.2 Performance Characteristics

Parameter Condition SCA100T -D01 SCA100T -D02 Units Measuring range Nominal ±30 ±0.5 ±90 ±1.0 g Frequency response –3dB LP (1 8-28 8-28 Hz Offset (Output at 0g) Ratiometric output Vdd/2 Vdd/2 V Offset calibration error ±0.11 ±0.23 ° Offset Digital Output 1024 1024 LSB Sensitivity between 0…1° (2 V/g mV/° Sensitivity calibration error ±0.5 ±0.5 % Sensitivity Digital Output 1638 819 LSB / g Offset temperature dependency Sensitivity temperature dependency Typical non-linearity Measuring range ±0.11 ±0.57 ° Digital output resolution between 0…1° (2 0.035 0.07 Bits ° / LSB Hz/ Analog output resolution(4 Bandwidth 10 Hz(3 0.0035 0.0035 ° Cross-axis sensitivity Max. 4 4 % Note 1. The frequency response is determined by the sensing element’s internal gas damping. Note 2. The angle output has SIN curve relationship to voltage output Note 3. 1st degree low pass filtered output Resolution = Noise density * √(bandwidth*1.6) Note 4. Typical value for most of the components

Murata Electronics Oy Subject to changes 4/17

1.3 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 4 5 mA Operating temperature -40 +125 °C Analog resistive output load Vout to Vdd or GND 10 kOhm Analog capacitive output load Vout to Vdd or GND 20 nF Start-up delay Reset and parity check 10 ms

1.4 SPI Interface DC Characteristics

Parameter Conditions Symbol Min Typ Max Unit Input terminal CSB Pull up current VIN = 0 V IPU 13 22 35 A Input high voltage VIH 4 Vdd+0.3 V Input low voltage VIL -0.3 1 V Hysteresis VHYST 0.23*Vdd V Input capacitance CIN 2 pF Input terminal MOSI, SCK Pull down current VIN = 5 V IPD 9 17 29 A Input high voltage VIH 4 Vdd+0.3 V Input low voltage VIL -0.3 1 V Hysteresis VHYST 0.23*Vdd V Input capacitance CIN 2 pF Output terminal MISO Output high voltage I > -1mA VOH Vdd- 0.5 V Output low voltage I < 1 mA VOL 0.5 V Tristate leakage 0 < VMISO < Vdd ILEAK 5 100 pA

1.5 SPI Interface AC Characteristics

Parameter Condition Min. Typ. Max. Units Output load @500kHz 1 nF SPI clock frequency 500 kHz Internal A/D conversion time 150 s Data transfer time for 8bit command and 11bit data @500kHz 38 s

1.6 SPI Interface Timing Specifications

Figure 2. Timing diagram for SPI communication

1.7 Electrical Connection

provided from pins OUT_1 and OUT_2. Figure 3. SCA100T electrical connection

1 SCK Input Serial clock

2 NC Input No connect, left floating

3 MISO Output Master in slave out; data output

4 MOSI Input Master out slave in; data input

5 Out_2 Output Y axis Output (Ch 2)

6 GND Supply Ground

7 CSB Input Chip select (active low)

8 NC Input No connect, left floating

9 ST_2 Input Self test input for Ch 2

10 ST_1 Input Self test input for Ch 1

11 Out_1 Output X axis Output (Ch 1)

12 VDD Supply Positive supply voltage (+5V DC)

1.8 Typical Performance Characteristics

following diagrams. The 3 sigma limits represents 99.73% of the SCA100T population.

Figure 4. Typical temperature dependency of SCA100T offset Figure 5. Typical temperature dependency of SCA100T sensitivity

1.8.1 Additional External Compensation

2 Functional Description

2.1 Measuring Directions

Figure 8. The measuring directions of the SCA100T

2.2 Voltage to Angle Conversion

V/g for the SCA100T-D01 and 2 V/g for the SCA100T-D02. shows the angle measurement error if straight line conversion is used.

2.3 Ratiometric Output

the supply voltage. If the SCA100T supply voltage is fluctuating the SCA100T output will also vary.

2.4 SPI Serial Interface

products always operates as a slave device in master-slave operation mode. wires for serial data input (MOSI), serial data output (MISO) and serial clock (SCK). Figure 9. Typical SPI connection The SPI interface in Murata products is designed to support any micro controller that uses SPI bus.

high impedance state until the falling edge of CSB. This reinitializes the serial communication. the output data is shifted out parallel with the input data. MEAS command is the exit command from Self test. operation without affecting the operation. The temperature data register is updated every 150 µs. writing all zeros is recommended. Figure 10. Command and 8 bit temperature data transmission over the SPI

acceleration signal stored in acceleration data register X. acceleration signal stored in acceleration data register Y. that is fed out MSB first and LSB last. Figure 11. Command and 11 bit acceleration data transmission over the SPI

2.5 Digital Output to Angle Conversion

Murata Electronics Oy Subject to changes 13/17          LSB/g LSBLSBarcsin Sens DD outout where; Dout digital output (RDAX or RDAY) Dout@0° digital offset value, nominal value = 1024  angle Sens sensitivity of the device. (SCA100T-D01: 1638, SCA100T-D02: 819) As an example following table contains data register values and calculated differential digital output values with -5, -1 0, 1 and 5 degree tilt angles. Angle [°] Acceleration [mg] RDAX (SCA100T- D01) RDAX (SCA100T- D02) -5 -87.16 dec: 881 bin: 011 0111 0001 dec: 953 bin: 011 1011 1001 -1 -17.45 dec: 995 bin: 011 1110 0011 dec: 1010 bin: 011 1111 0010 0 0 dec: 1024 bin: 100 0000 0000 dec: 1024 bin: 100 0000 0000 1 17.45 dec: 1053 bin: 100 0001 1101 dec: 1038 bin: 100 0000 1110 5 87.16 dec: 1167 bin: 100 1000 1111 dec: 1095 bin: 100 0100 0111

2.6 Self Test and Failure Detection Modes

To ensure reliable measurement results the SCA100T has continuous interconnection failure and calibration memory validity detection. A detected failure forces the output signal close to power supply ground or VDD level, outside the normal output range. The calibration memory validity is verified by continuously running parity check for the control register memory content. In the case where a parity error is detected, the control register is automatically re-loaded from the EEPROM. If a new parity error is detected after re-loading data both analog output voltages are forced to go close to ground level (<0.25 V) and SPI outputs go below 102 counts. The SCA100T also includes a separate self test mode. The true self test sim ulates acceleration, or deceleration, using an electrostatic force. The electrostatic force simulates acceleration that is high enough to deflect the proof mass to the extreme positive position, and this causes the output signal to go to the maximum value. The self test function is activated either by a separate on-off command on the self test input, or through the SPI. To ensure that output goes to positive end product must be in 0g position. For position below 0g output change might be limited to +1g change of the output. The self-test generates an electrostatic force, deflecting the sensing element’s proof mass, thus checking the complete signal path. The true self test performs following checks:  Sensing element movement check  ASIC signal path check  PCB signal path check  Micro controller A/D and signal path check The created deflection can be seen in both the SPI and analogue output.s The self test function is activated digitally by a STX or STY command, and de-activated by a MEAS command. Self test can be also activated applying logic”1” (positive supply voltage level) to ST pins (pins 9 & 10) of SCA100T. The self test Input high voltage level is 4 – Vdd+0.3 V and input low voltage level is 0.3 – 1 V. The self test function must not be activated for both channels at the same time.

Figure 12. Self test wave forms V1 = initial output voltage before the self test function is activated. V2 = output voltage during the self test function. initial value after the specified stabilization time. After a longer time (max. 1 second) V1=V3. T5 = Rise time during self test.

2.7 Temperature Measurement

The SCA100T has an internal temperature sensor, which is used for internal offset compensation. the temperature measurement is about ±1 °C.

3 Application Information

3.1 Recommended Circuit Diagrams and Printed Circuit Board Layouts

of the system. For example 470 pF and 1uF capacitor can be used. voltage for both the SCA100T and Analog/Digital converter. Use low pass RC filters with 5.11 kΩ and 10nF on the SCA100T outputs to minimize clock noise. narrow power supply or GND connection strips on PCB. Figure 13. Analog connection and layout example Figure 14. SPI connection example

3.2 Recommended Printed Circuit Board Footprint

Figure 15. Recommended PCB footprint

4 Mechanical Specifications and Reflow Soldering

4.1 Mechanical Specifications (Reference only)

RoHS compliance: RoHS compliant lead free component. Co-planarity error 0.1mm max. Figure 16. Mechanical dimensions of the SCA100T (Dimensions in mm)

4.2 Reflow Soldering

normal SMD pick-and-place equipment. Figure 17. Recommended SCA100T body temperature profile during reflow soldering. Ref. Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max.  Preheating time and temperatures according to guidance from solder paste manufacturer. error from intended measuring direction during assembly process.  Wave soldering is not recommended.