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PDF SCA61T Data sheet ( Hoja de datos )
| Número de pieza | SCA61T | |
| Descripción | INCLINOMETER SERIES | |
| Fabricantes | Hy-Line | |
| Logotipo |  |
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Data Sheet
SCA61T Series
THE SCA61T INCLINOMETER SERIES
The SCA61T Series is a 3D-MEMS-based single axis inclinometer family that provides instrumentation grade
performance for leveling applications. Low temperature dependency, high resolution and low noise together with
robust sensing element design make the SCA61T ideal choice for leveling instruments. The VTI inclinometers are
insensitive to vibration, due to their over damped sensing elements and can withstand mechanical shocks of
20000 g.
Features
• Measuring ranges ±30° SCA61T-FAHH1G
and ± 90° SCA61T-FA1H1G
• 0.0025° 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
• 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
• Leveling instruments
• Acceleration and motion measurement
6 ST
Sensing
element
Self test 1
8 VDD
Signal conditioning
and filtering
EEPROM
calibration
memory
Temperature
Sensor
A/D conversion
SPI interface
Figure 1.
4 GND
Functional block diagram
7 OUT
1 SCK
2 MISO
3 MOSI
5 CSB
VTI Technologies Oy
www.vti.fi
Subject to changes
Doc. nr. 8261900
1/18
Rev.A
1 page  
SCA61T 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
TLS1
TLS2
Min.
120
120
Typ.
Max.
Unit
ns
ns
TCL 1
µs
TCH 1
µs
TSET
THOL
30
30
ns
ns
TVAL1
TLZ
10
10
100 ns
100 ns
TVAL2
100 ns
TLH
TLH
15
150
µs
µs
CSB
SCK
MOSI
MISO
TLS1
TVAL1
TCH
TCL
THOL
MSB in
MSB out
TVAL2
DATA in
DATA out
TLS2
TLH
TSET
LSB in
LSB out
TLZ
Figure 2.
Timing diagram for SPI communication
VTI Technologies Oy
www.vti.fi
Subject to changes
Doc. nr. 8261900
5/18
Rev.A
5 Page 
SCA61T Series
• 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 is 5300 samples per sec / channel
The 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
RDSR
RLOAD
STX
RDAX
Command
Format
00000000
00001000
00001010
00001011
00001110
00010000
Description:
Measure mode (normal operation mode after power on)
Read and write temperature data register
Read status register
Reload NV data to memory output register
Activate Self test for X-channel
Read X-channel acceleration through SPI
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 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 the RWTR command in order to guarantee correct data. The data transfer is presented in
Figure 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.
CSB
SCK
MOSI
M ISO
01
23
45
67
8 9 10 11 12 13 14 15
COMMAND
H IG H IM PED AN C E
76
DATA IN
543
2 10
76
DATA OUT
543
2
10
Figure 10. Command and 8 bit temperature data transmission over the SPI
Self test for X-channel (STX) activates the self test function for the X-channel (Channel 1). The
Internal charge pump is activated and a high voltage is applied to the X-channel acceleration
sensor element electrode. This causes the electrostatic force that deflects the beam of the sensing
element and simulates the acceleration to the positive direction. The self-test is de-activated by
giving the MEAS command.
Read X-channel acceleration (RDAX) accesses the AD converted X-channel acceleration signal
stored in acceleration data register X.
During normal operation, acceleration data registers are reloaded every 150 µs. The load
operation is disabled whenever the CSB signal is low, hence CSB must stay high at least 150 µs
prior the RDAX command in order to guarantee correct data. Data output is an 11-bit digital word
that is fed out MSB first and LSB last.
VTI Technologies Oy
www.vti.fi
Subject to changes
Doc. nr. 8261900
11/18
Rev.A
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SCA61T.PDF ] | |
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