PDF SCA100T Data sheet ( Hoja de datos )

Número de pieza	SCA100T
Descripción	DUAL AXIS INCLINOMETER
Fabricantes	Murata
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No Preview Available ! Data Sheet SCA100T Series THE SCA100T DUAL AXIS INCLINOMETER SERIES The SCA100T Series is a 3D-MEMS-based dual axis inclinometer family that provides instrumentation grade performance for leveling applications. The measuring axes of the sensing elements are parallel to the mounting plane and orthogonal to each other. Low temperature dependency, high resolution and low noise, together a with robust sensing element design, make the SCA100T the ideal choice for leveling instruments. The Murata inclinometers are unsensitive to vibration, due to their over damped sensing elements, and can withstand mechanical shocks of up to 20000 g. 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 12 VDD Sensing element 1 Signal conditioning and filtering 10 ST_1 9 ST_2 Self test 1 Self test 2 EEPROM calibration memory Temperature Sensor Sensing element 2 Signal conditioning and filtering A/D conversion SPI interface 11 OUT_1 1 SCK 3 MISO 4 MOSI 7 CSB 5 OUT_2 Figure 1. Functional block diagram 6 GND Murata Electronics Oy www.muratamems.fi Subject to changes Doc.Nr. 8261800 1/17 Rev.B2 Free Datasheet http://www.datasheet4u.com/ 1 page SCA100T Series 1.6 SPI Interface Timing Specifications Parameter Terminal CSB, SCK Time from CSB (10%) to SCK (90%) Time from SCK (10%) to CSB (90%) Terminal SCK SCK low time SCK high time Terminal MOSI, SCK Time from changing MOSI (10%, 90%) to SCK (90%). Data setup time Time from SCK (90%) to changing MOSI (10%,90%). Data hold time Terminal MISO, CSB Time from CSB (10%) to stable MISO (10%, 90%). Time from CSB (90%) to high impedance state of MISO. Terminal MISO, SCK Time from SCK (10%) to stable MISO (10%, 90%). Terminal CSB Time between SPI cycles, CSB at high level (90%) When using SPI commands RDAX, RDAY, RWTR: Time between conversion cycles, CSB at high level (90%) Conditions Load capacitance at MISO < 2 nF Load capacitance at MISO < 2 nF Load capacitance at MISO < 15 pF Load capacitance at MISO < 15 pF Load capacitance at MISO < 15 pF Symbol Min. Typ. Max. Unit TLS1 TLS2 120 120 ns ns TCL 1 s TCH 1 s TSET THOL 30 30 ns ns TVAL1 10 TLZ 10 100 ns 100 ns TVAL2 100 ns TLH TLH 15 150 s s TLS1 TCH TCL TLS2 TLH CSB SCK MOSI MISO TVAL1 THOL MSB in MSB out TVAL2 DATA in DATA out TSET LSB in LSB out Figure 2. Timing diagram for SPI communication TLZ Murata Electronics Oy www.muratamems.fi Subject to changes Doc. nr. 8261800 5/17 Rev.B2 Free Datasheet http://www.datasheet4u.com/ 5 Page SCA100T Series  each bit is sampled on the rising edge of SCK (MOSI line)  after the device is selected with the falling edge of CSB, an 8-bit command is received. The command defines the operations to be performed  the rising edge of CSB ends all data transfer and resets internal counter and command register  if an invalid command is received, no data is shifted into the chip and the MISO remains in high impedance state until the falling edge of CSB. This reinitializes the serial communication.  data transfer to MOSI continues immediately after receiving the command in all cases where data is to be written to SCA100T’s internal registers  data transfer out from MISO starts with the falling edge of SCK immediately after the last bit of the SPI command is sampled in on the rising edge of SCK  maximum SPI clock frequency is 500kHz  maximum data transfer speed for RDAX or RDAY is 5300 samples per sec for one channel at 500kHz clock  maximum data transfer speed for RDAX and RDAY is 4150 samples per sec for two channel at 500kHz clock SPI command can be either an individual command or a combination of command and data. In the case of combined command and data, the input data follows uninterruptedly the SPI command and the output data is shifted out parallel with the input data. The SPI interface uses an 8-bit instruction (or command) register. The list of commands is given in Table below. Command name MEAS RWTR STX STY RDAX RDAY Command format 00000000 00001000 00001110 00001111 00010000 00010001 Description: Measure mode (normal operation mode after power on) Read temperature data register Activate Self test for X-channel Activate Self test for Y-channel Read X-channel acceleration Read Y-channel acceleration Measure mode (MEAS) is standard operation mode after power-up. During normal operation, the MEAS command is the exit command from Self test. Read temperature data register (RWTR) reads temperature data register during normal operation without affecting the operation. The temperature data register is updated every 150 µs. The load operation is disabled whenever the CSB signal is low, hence CSB must stay high at least 150 µs prior to the RWTR command in order to guarantee correct data. The data transfer is presented in Figure 10 below. The data is transferred MSB first. In normal operation, it does not matter what data is written into temperature data register during the RWTR command and hence writing all zeros is recommended. Figure 10. Command and 8 bit temperature data transmission over the SPI Murata Electronics Oy www.muratamems.fi Subject to changes Doc. nr. 8261800 11/17 Rev.B2 Free Datasheet http://www.datasheet4u.com/ 11 Page

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