PDF SCA103T Data sheet ( Hoja de datos )

Número de pieza	SCA103T
Descripción	DIFFERENTIAL INCLINOMETER
Fabricantes	Murata
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No Preview Available ! Data Sheet SCA103T Series THE SCA103T DIFFERENTIAL INCLINOMETER SERIES The SCA103T Series is a 3D-MEMS-based single axis inclinometer family that uses the differential measurement principle. The high calibration accuracy combines extremely low temperature dependency, high resolution and low noise together with a robust sensing element design, to make the SCA103T an ideal choice for high accuracy leveling instruments. The Murata inclinometers are insensitive to vibration due to having over damped sensing elements plus they can withstand mechanical shocks of 20000 g. Features  Measuring ranges ±15° SCA103T-D04 and ± 30° SCA103T-D05  0.001° resolution (10 Hz BW, analog output)  Sensing element controlled over damped frequency response (-3dB 18Hz)  Robust design, high shock durability (20000g)  Excellent stability over temperature and time  Common mode error and noise reduction using the differential measurement principle  Single +5 V supply Applications  Platform leveling and stabilization  Rotating laser levels  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  Leveling instruments  Construction levels 12 VDD S ens i ng element 1 Signal conditioning and filtering 10 ST_1 9 ST_2 Self test 1 Self test 2 E E P RO M calibration memory Temperature Sensor S ens i ng 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. 8261700 1/17 Rev.A3 Free Datasheet http://www.datasheet4u.com/ 1 page SCA103T 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 SPI 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. 8261700 5/17 Rev.A3 Free Datasheet http://www.datasheet4u.com/ 5 Page SCA103T Series The SPI interface in Murata products is designed to support any micro controller that uses SPI bus. Communication can be carried out by software or hardware based SPI. Please note that in the case of hardware based SPI, the received acceleration data is 11 bits. The data transfer uses the following 4-wire interface: MOSI MISO SCK CSB master out slave in master in slave out serial clock chip select (low active) µP → SCA103T SCA103T → µP µP → SCA103T µP → SCA103T Each transmission starts with a falling edge of CSB and ends with the rising edge. During transmission, commands and data are controlled by SCK and CSB according to the following rules:  commands and data are shifted; MSB first, LSB last  each output data/status bits are shifted out on the falling edge of SCK (MISO line)  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 SCA103T’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 and RDAY is 5300 samples per sec / channel 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 in 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 the standard operation mode after power-up. During normal operation, MEAS command is the exit command from Self test. Read temperature data register (RWTR) reads the temperature data register during normal operation without effecting the operation. 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. Murata Electronics Oy www.muratamems.fi Subject to changes Doc.Nr. 8261700 11/17 Rev.A3 Free Datasheet http://www.datasheet4u.com/ 11 Page

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