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2007699

器件型号:2007699
器件类别:嵌入式解决方案    工程工具    传感器开发工具    加速传感器开发工具   
厂商名称:First Sensor
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器件描述

加速传感器开发工具 SensB04.SA-14.S1.C-15; SensAcc Sensor Board

参数
产品属性属性值
制造商:First Sensor
产品种类:加速传感器开发工具
RoHS:详细信息
产品:Evaluation Boards
类型:Accelerometer
工具用于评估:SA-14.S1.C-15
工作电源电压:5 V
加速:15 g
商标:First Sensor
接口类型:SPI
产品类型:Acceleration Sensor Development Tools
工厂包装数量:1
子类别:Development Tools
零件号别名:53001608

2007699器件文档内容

SI & SA evaluation kits for high-precision inertial sensors

The SI & SA evaluation kits are inertial sensor modules

including control board, sensor board and software for

easy-to-use read-out and quick evaluation of the sensor

data. The capacitive inclinometers and accelerometers

from First Sensor are based on single crystal silicon sensor

elements and utilize state-of-the-art micromechanical

technology (HARMS, AIM) to achieve large signal-to-noise

ratios and excellent stability over temperature.

Benefits of the AIM technology                  Features of the sensor system                 Applications

–– Ultra-low cross axis sensitivity due to      –– Dual axis measurement                      –– Geoengineering

HARMS technology                                –– Excellent stability over temperature       –– Condition monitoring

–– Thin-film free mechanical components,        –– Digital SPI interface                      –– Navigation

single crystal silicon based                    –– High resolution ADC offering more than     –– Security systems

–– Minimizing of parasitic capacitances due to  100 dB dynamic range                          –– Platform control and stabilization

insulation of the functional components by      –– Configurable bandwith output filter        –– Tilt sensing and leveling

air gap                                         –– Shock survival 1500 g                      –– Industrial applications

–– Complete dry processing                      –– Hermetically sealed package

–– Excellent thermal performance                –– Customized sensor solutions for packaging

–– Large signal-to-noise ratio                  and signal processing

–– Mechanical over-damped to reduce parasitic

signals

–– Customer specific measurement ranges

due to flexible adjustment of mass, spring

and damping

E/1               Subject to change without notice  www.first-sensor.com                      contact@first-sensor.com               Page 1/6
SI & SA evaluation kits for high-precision inertial sensors

Dimensional drawing and electrical connection

Caution:

The product can be damaged by incorrect connection. Please double            check  the  cable  configuration      between

sensor and control board.

Control board

                                                       Pin assignment

                                                       not used

                                                       VDD (5 V)

                                                       SSN (Serial Select)

                                                       SCK (Serial Clock)

                                                       MOSI

                                                       MISO

                                                       GND

Sensor board

Pin assignment

     VDD (5 V)

SSN (Serial Select)

SCK (Serial Clock)

               MOSI

               MISO

               GND

                                                                                                                   dimensions in mm

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SI & SA evaluation kits for high-precision inertial sensors

User manual of the terminal software

The software that is used for evaluation of the sensors is a simple              Other software, for instance specialized measurement programs, can

terminal program and runs under Windows operating systems. In case               also be used if they are capable of sending and receiving correct com-

of using Linux as operating system please contact us. The evaluation kit         mand strings. Each command string send from the controlling computer

is powered using the USB interface. Therefore, no additional reference           has to be terminated by a CR-LF sequence (Carriage Return, Line Feed,

voltage is necessary. The software is running without an installation.           0x0D0A). Commands that are not terminated with his sequence are not

However, it is necessary to install the drivers of the FT232R USB serial         recognized as valid by the microcontroller. The microcontroller responds

converter. Please connect the sensor board “SensB01.SX-XX.S1.C-XX”               to valid commands by executing the requested commands and sending

with the control board “ConB01.SX-SPI” (for the correct connections              a response string, also terminated with CR-LF sequence. For communi-

check the pin assignment) as well as the control board with a PC. When           cation with the control board “ConB01.SX-SPI” it is necessary to setup

the new hardware is detected automatically, continue the installing              correct parameters for the additional COM-port. After starting the

using manual selection of the drivers which are located in the folder “…/        program using “HTerm.exe” please verify that the preconfigured para-

First Sensor/driver”. The drivers are correctly installed if you have done       meters are selected as shown in Figure 1. The correct COM port that is

this procedure two times. In case that the hardware is not detected au-          used for the evaluation kit is obtained by using the device manager of

tomatically, it is recommended to use the device manager for selecting           the PC.

the unknown hardware and installing of the required drivers.

                   Select COM Port                              Baudrate: 57600                     Newline characters: CR+LF

                   and connect                                  Data Bits: 8

                                                                Stop Bit: 1

                                                                Parity: NONE

Fig.  1:  Control  panel  of  the terminal software and selection  of  the    COM-port parameters

E/1                           Subject to change without notice                www.first-sensor.com  contact@first-sensor.com                         Page 3/6
SI & SA evaluation kits for high-precision inertial sensors

User manual of the terminal software

                                                                                Saving the measurement results

Clear output

data field

                                                           Data output

                                                           Time difference of the marked measure-

                                                           ment results [hh:mm:ss] and timestamp of

                                                           the corresponding measurement value

                         Input of commands                                      Verfication that the control board is correctly connected

Fig. 2: General overview of the control panel

As shown in Figure 2 the control panel consists of two general buttons          Furthermore, after the measurement has been finished it is possible to read

(clearing the received data and saving the measurement results), a              out the duration of the measurement. Using “Ctrl+a”, all data of the output

data output section, a read out of the timing information as well as a          section is marked and the time difference is shown in the timing informa-

command line interface.                                                         tion line. Otherwise the timestamp of the operating system could be used

                                                                                to calculate the duration of the measurement. In this case it is necessary to

To store the measurements results the button “Save output” is used. The         read out the timestamp of the first and the last measurement result.

default kind of the result file is similar to a text file format. Please note,

that the complete data of the output section is stored in the result file.      To adjust the measurement and the sensor parameters some simple com-

Therefore, clearing the output data field is recommended before starting        mands are necessary. A list of available commands is depicted in Table 16

the measurement. This is done by pressing the “Clear received” button.          and shown in the data output section when the command HELP is written

                                                                                in the command line and finished using the enter button.

E/1                      Subject to change without notice                       www.first-sensor.com            contact@first-sensor.com              Page 4/6
SI & SA evaluation kits for high-precision inertial sensors

User manual of the terminal software

Overview of available commands using the terminal software

Command  Usage/value   Description

Using the following commands it is possible to configure the measurement parameters and to receive status information of the register values.

                       Starts output of measurement results over serial interface. Output values will be the current chip temperature and the current acceleration

START                  of the selected axis. Please note that results are raw data, expressed in [LSB] and without any compensation. To convert the raw data into a

                       corresponding temperature in [°C] or acceleration in [g] please see chapter “5.3 First Measurements”.

STOP                   Stops output of measurement results over serial interface.

HELP                   A list of all available commands and their usage is shown.

RSYS     ADD           Read the 32 bit data from the corresponding address of the system register. The kind of input is RSYS ADD value.

RSYS     ALL           List of all system register values. The kind of input is RSYS ALL.

SET      A or B        SETA or SETB is used to select the sensitive direction of the sensor. Up to now, simultaneous read out of both sensor channels is not possible.

                       However, you can switch between the two channels using the command SETvalue (value A or B is written without space).

PARAM    LIST          List of the configured sensor settings and the corresponding values of the registers. The kind of input is PARAM LIST.

                       The command PARAM AVG is used to control the averaging factor as well the output data rate of the evaluation kit. Allowed values are 1…255.

                       Default value is 1 leading to an output data rate of about 100 Hz in case of using default values of OBW and DSE. Due to the USB interface

PARAM    AVG           200 Hz is the maximum output data rate. To calculate the output data rate equation (4) is used (see chapter “4.3 Filter and Output Data Rate

                       Registers”). If you exceed the maximum output data rate of 200 Hz by configuring OBW and DSE, please use PARAM AVG to decrease the

                       output data rate of the evaluation kit. Usually the noise of the sensor is proportional to the square root of the output data rate. The kind of input

                       is PARAM AVG value.

PARAM    NR            Sets the number of measurement points. Allowed values are 0…50000. If 0 (default value) is set, the sensor does continuous measurements. The

                       kind of input is PARAM NR value.

LVM                    Enables the low voltage mode. Allowed values are 0 (normal operation) or 1 (low voltage mode using 1.2V measurement voltage (default: 1 (SI)

                       and 0 (SA))

To configure the sensor settings the command WSYS is used. The usage of the command refers to the adjusted register name and possible values are also described

in chapter “4. Description of System Registers”. The kind of input is WSYS usage value.

WSYS     DOS           Configures the Filter Decimation Output selection. Allowed values are 0 = normal output, 1 = DCF is bypassed and 2 = DCF and HBF are

                       bypassed. (default: 0)

WSYS     OBW           Configures the Filter Decimation Factor. Usually changing the Filter Decimation Factor during operation requires a resetting. However, this is

                       done automatically. Allowed values are 0…7 (default: 3).

WSYS     DSE           Configures the Down Sampling Factor and determines the ration between the output bandwidth and the output data rate. Allowed values are 0

                       and 1 (default: 0)

WSYS     CLK           Configures the Sampling Frequency of the excitation voltage. Allowed values are 1…127 (default: 100)

WSYS     VREF          Configures the Voltage Reference required for driving the sensors excitation. The voltage can output 2.1V and up to 4.4V that is adjusted using

                       allowed values between 0…15 (default: 0)

WSYS     GAIN1         Configures the Sense Gain Control 1 of both sensor channels. Allowed values are 2…15 (default: 11 (SI) and 12 (SA), should be adjusted to

                       application specific value)

WSYS     GAIN2         Configures the Sense Gain Control 2 of both sensor channels. Allowed values are 0…7 (default: 5 (SI) and 2 (SA), should be adjusted to

                       application specific value)

WSYS     ADCA          ADC digital Gain of Channel SetA. Allowed values are 0…524288 (default: 500)

WSYS     ADCB          ADC digital Gain of Channel SetB. Allowed values are 0…524288 (default: 500)

WSYS     OFTA          Offset Trimming of Channel SetA by adjusting the positive terminal, the negative terminal is configured automatically. Allowed values are

                       3141…8191 (default: 5667)

WSYS     OFTB          Offset Trimming of Channel SetB by adjusting the positive terminal, the negative terminal is configured automatically. Allowed values are

                       3141…8191 (default: 5667)

         SF0, SF1,     Coefficients of Scale Factor, Bias and nominal temperature in quadratic equation. Nominal temperature is 64 times higher than the raw data of

WSYS     SF2, B0, B1,  the temperature sensor in normal operation mode. (see Table 15 for allowed values)

         B2, T0

WSYS     CSEL          Sensor output selection (1 = normal output, 0 = calibrated output using the temperature coefficients).

E/1                    Subject to change without notice                          www.first-sensor.com      contact@first-sensor.com                                           Page 5/6
SI & SA evaluation kits for high-precision inertial sensors

First measurements

First Sensor’s accelerometers feature a digital output signal Outraw           Because there is no factory calibration of the sensor output signal it

expressed in [LSB]. The output signal is described as linear characteristic    is necessary to determine both coefficients. Usually special tools for

in dependency of the occurring force or acceleration Acc respectively.         determination of the coefficients are not required. To calculate the scale

According to equation (1) the slope of the characteristic is given as scale    factor and the bias according to equation (3) and (4) please turn your

factor K1 and the intercept of the characteristic is given as the bias K0.     device to a vertical position and perform a measurement. Afterwards

                                                                               repeat the measurement using the opposite direction of rotation.

               Outraw(Acc) = K1 · Acc + K0                 (1)

Inclination sensing uses the gravity vector and its projection on the          K1  =                 ( ) Outraw,+90° - Outraw,-90°         (3)
                                                                                                     Acc+90° - Acc-90°

axes of the low-g accelerometer to determine the tilt angle. Referring

to basic trigonometry, the projection of the gravity vector on the

corresponding axis leads to an output acceleration equal to the sine of

the angle between the accelerometer axis and the horizon. The horizon          K0  =                 ( ) Outraw,+90° + Outraw,-90°         (4)

is typically taken to be the plane orthogonal to the gravity vector. For                             2

an ideal value of 1 g for gravity, the output inclination is calculated using

equation (2).

               ( ) Tilt = arcsinAcc                        (2)                 After calculating of both coefficients equation (1) is used to obtain the

                            1g                                                 acceleration Acc utilizing the raw data of the measurement as well

                                                                                             as the scale factor and the bias. It is also possible to use different tilt

                                                                               positions (for example ±15° or ±30°) to obtain the coefficients K1 and K0.

According to IEEE Std 528-2001 the scale factor K1 of the

accelerometers is defined as the ratio of a change in output to a change       The integrated temperature sensor also features a digital output signal.

in the input intended to be measured. The scale factor is generally            Similar to the calculation of the acceleration the output signal of the

evaluated as the slope of the straight line that can be fitted by the          temperature sensor is given in the following equation (5).

method of least squares to input-output data. The scale factor of the

digital accelerometer is expressed in [LSB/g]. Furthermore, the bias K0               Outraw(Temp) = K1 · Temp + K0                        (5)

is the average over a specified time of accelerometer output measured

at specified operating conditions that has no correlation with input           The scale factor of the temperature sensor is 80 LSB/K and the intercept

acceleration or rotation. The bias is expressed in [LSB].                      of the characteristic is about 5950 LSB. Also the temperature sensor is

                                                                               not factory calibrated. For instance the 7950 corresponds to 25 °C.

Ordering       information

Order #        Series                       Sensor element                     Signal conditioning   Housing                        Measurement range

3004860        EvaK04.SI- [Inclinometer]    11. [±30° measurment range]        S1. [24 bit ASSP]     C [Ceramic LCC28]              -30 [±30°]

Order #        Series                       Sensor element                     Signal conditioning   Housing                        Measurement range

3004862        EvaK06.SA- [Accelerometer]   12.  ±3 g measurment range                                                              -3     ±3 g

3004863        EvaK01.SA- [Accelerometer]   13.  ±8 g measurment range         S1. [24 bit ASSP]     C [Ceramic LCC28]              -8     ±8 g

3004864        EvaK05.SA- [Accelerometer]   14.  ±15 g measurment range                                                             -15    ±15 g

E/1                    Subject to change without notice                        www.first-sensor.com  contact@first-sensor.com                       Page 6/6
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