Kistler DTI307 Owner's manual

Brand: Kistler

Model: DTI307

Type: Owner's manual

Instruction

Manual

DTI307_002-727e-03.15

DiMod Digitization

Module

Type DTI307...

Instruction

Manual

DTI307_002-727e-03.15

DiMod Digitization

Module

Type DTI307...

Page 1DTI307_002-727e-03.15

Information in this document is subject to change without

notice. Kistler reserves the right to change or improve its

products and make changes in the content without

obligation to notify any person or organization of such

changes or improvements.

Kistler Group

Eulachstrasse 22

8408 Winterthur

Switzerland

Tel. +41 52 224 11 11

Fax +41 52 224 14 14

info@kistler.com

www.kistler.com

Foreword

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 2

Content

1. Introduction .................................................................................................................................3

1.1 Disposal Instructions for Electrical and Electronic Equipment ............................................4

2. Introduction .................................................................................................................................5

3. DiMod Components ....................................................................................................................6

4. Design and Connections ............................................................................................................8

4.1 Uniaxial DiMod Type DTI307.1 ...........................................................................................8

4.2 Uniaxial DiMod Type DTI307.1S.........................................................................................9

4.3 Triaxial DiMod Type DTI307.3 ..........................................................................................11

4.4 Triaxial DiMod Type DTI307.3S ........................................................................................12

5. Technical Data ...........................................................................................................................14

5.1 Analog Signal Conditioning ..............................................................................................14

5.2 Digital Control ...................................................................................................................15

5.3 Power Supply ...................................................................................................................15

6. Labels .........................................................................................................................................16

7. AmplicationFactorandShuntStimulation ..........................................................................17

Total pages 19

Introduction

Page 3DTI307_002-727e-03.15

1. Introduction

Thank you for choosing a quality product from Kistler.

Please read through this manual thoroughly to enable you

to fully exploit the various features of your product.

To the extent permitted by law Kistler accepts no liability

if this instruction manual is not followed or products other

than those listed under Accessories are used.

Kistler offers a wide range of measurement products

through to turnkey solutions:

Piezoelectric sensors for measuring pressure, force,

torque, strain, acceleration, shock and vibration

Strain gage sensor systems for measuring force and

torque

Piezoelectric pressure sensors and transmitters with

matching measuring ampliers

Matching measuring ampliers (charge ampliers, pi-

ezoresistive ampliers, etc.), displays and charge ca-

librators

Electronic control, monitoring and evaluation units as

well as software for specic measurement applications

Data transmission modules (telemetry)

Kistler also develops and produces measuring solutions

for the application elds engines, vehicles, manufacturing,

plastics and biomechanics sectors.

Our product and application brochures will provide you

with an overview of our product range. Detailed data

sheets are available for almost all products.

If you need additional help beyond what can be found

either on-line or in this manual, please contact Kistler‘s

extensive support organization.

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 4

1.1 Disposal Instructions for Electrical and Electronic Equipment

Do not discard old electronic equipment in municipal

trash. For disposal at end of life, please return this pro-

duct to the nearest authorized electronic waste disposal

service or contact your Kistler sales ofce for instructions.

Introduction

Page 5DTI307_002-727e-03.15

2. Introduction

The number of sensors in crash test dummies increases

more and more so that the conventional instrumentation

with analogue lines from the dummy to an external data

acquisition system gets problems with the volume of the

cabling. This problem can be solved with very small data

acquisition electronics within or nearby the sensors which

give out the digitized sensor signals via bus lines. Bus li-

nes for data transmission reduce weight and volume of

the cabling so that the additional weight for the in-dummy

electronics will be more than compensated.

Sensor ID modules with TEDS (Transducer Electro-

nic Data Sheets) are state of the art in the conventional

equipment. These modules can be replaced with so called

DiMods (Digitizing Modules), which do not need more

mounting space. DiMods are microelectronic components

with a suited signal acquisition for the enclosed sensor, a

nonvolatile TEDS memory and a bus interface. The bus

technology with DiMods at the sensors and a recorder,

which takes up the bus lines and handles data is called

the DTI concept (Digital Transducer Interface) using the

DTI bus lines.

DTI uses the today available most integrated microelec-

tronic components and is optimized for lowest weight and

volume so that the DTI dummies do not have to be special

prepared and validated.

The main part of the DTI in-dummy measurement system

is a recorder with a large memory and a UPS power

supply for an autonomous operation of the dummy for

more than 10 minutes with all sensors active. These units

are described in a special paper. They are mounted at the

spine box in the center of the dummy.

The DTI bus line is a 4 wire bus with two lines for exci-

tation and two lines for a half duplex data transfer in the

noise-free differential RS-485 format with 6 MHz trans-

mission rate. One DTI bus line has the capacity for the

signals of 12 sensors which are sampled with 20 kHz with

a resolution of 16 bits. Data is stored in the recorder and

the sensor data is transferred online from the DiMods to

the recorder in small packages. The simultaneous data

sampling is controlled by the recorder so that the DiMods

do not need to use a precise clock generator. This offers

a very low volume and power consumption of the whole

system.

DiMods in several designs are available for uniaxial sen-

sors (DiMod Type DTI307.1) and triaxial sensors (DiMod

Type DTI307.3).

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 6

3. DiMod Components

The singel channel DiMods Type DTI307.1 contain the

following components:

Low noise instrumentation amplier which gain is spe-

cial adjusted for the enclosed sensor

Antialiasing lter 4 poles, 4 kHz edge frequency

Low droop sensor regulator for sensor excitation 5 V

Switches for sensor shunt stimulation 0 V/5 V

Sampling ADC with 16 bits resolution

Onechip microcontroller

EEPROM with 8 kBytes

RS-485 bus interface

Regulator

5 V

Gain fixed

Controller

Filter

Regulator

3,3 V

buffering 1 ms

EEPROM

Update

Bus

connection RS-485

Sensor

Shunt

+5 V

0 V

5,1 ... 5,5 V

Fig. 1: Block diagram DiMod Type DTI307.1

The signal acquisition is reduced to a minimum of parts

to save volume and power. The sensor is calibrated to-

gether with the DiMod. This total calibrated system inclu-

ding sensor, signal acquisition and digitizing gives a very

good performance.

The 16 bits resolution with the low noise amplier requires

no need for a programmable amplication. The amplica-

tion factor is adjusted at the amplier input stage with a

soldered resistor and it is calculated for the sensor ope-

rating range with a great reserve at the upper and lower

side. DiMods are produced with several preadjusted in-

put voltage ranges so that each sensor may be combined

with a matched DiMod.

DiMod Components

Page 7DTI307_002-727e-03.15

For a quick self test of the signal chain the sensor can be

stimulated with a shunt switched to 0 V or +5 V.

The lter has an edge frequency of 4 kHz. Filtering down

to the SAE lter classes can be done in a post processing

on the PC side.

A triaxial DiMod looks from the side of the bus connection

like a uniaxial DiMod. This is controlled by the rmware.

Both the uniaxial and triaxial DiMods have the same

EEPROM with a volume of 8 kBytes. For the triaxial

application it is divided in three sections with each

2,666 kBytes. For compatibility the uniaxial DiMod can

access only the same volume. This EEPROM is used

for the sensor TEDS which are needed for data handling

without a data base.

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 8

4. Design and Connections

4.1 Uniaxial DiMod Type DTI307.1

The dimension of this DiMod (Fig. 2) with 10x9x6 mm is

nearly the same as a sensor ID module. The DiMod with

its pins in a 1,27 mm grid may be soldered in an adaptor

board or the pins may be removed for direct wiring with

sensor and DTI bus line.

A B C D E F G H

-S

+5V

GND

-RS-485

+RS-485

DTI +VDC

Fig. 2: DiMod Type DTI307.1 for a uniaxial sensor with

pin connections

Fig. 3: Uniaxial DiMod Type DTI307.1 IC side non-fol-

ded

Design and Connections

Page 9DTI307_002-727e-03.15

4.2 UniaxialDiModTypeDTI307.1S

This DiMod is designed as very small board which may be

integrated in the sensor cable using special housings. For

half or quarter bridges resistor networks are on the board.

Additional the sensor excitation voltage may be adjusted

for potentiometer sensors.

Fig. 6 shows the solder pads for sensor and DTI cable

connection and in Fig. 7 the input conguration is shown.

Fig. 4: Uniaxial DiMod Type DTI307.1S IC side

Fig. 5: Uniaxial DiMod Type DTI307.1S passive side

X1 X2 X3 X4 X5 X6 X7 X8 X9

X10

-RS-485

+RS-485

VCC

GND

-U

-S

R5 R4 R2 R3

5X 4X

-RS-485

+RS-485

VCC

GND

-U

-S

R30

STIMR GAINR

307.01S

X5, X10 - Sensor connections

over dropping resistor

Fig. 6: DiMod Type DTI307.1S connecting pads

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 10

Rg IC14

AD8221ARM

X10

SEL

R30

SEL STIMR

R28

SEL

R26

2k2

R27

2k2

C48

330p

C49

330p

C42

4n7

VDD

+ANA3

-ANA3

GND

GAINR

Fig. 7: DiMod Type DTI307.1S, input conguration and

network for sensor connection

R5 and R6 adjust the sensor excitation voltage. R2 and

R4 built up the supplement for a half bridge sensor and

additional R3 for a quarter bridge. All resistors are in the

dimension 0603.

For contact measurements R2, R3 and R4 are equipped

with resistors 1 kΩ and the switch can be contacted bet-

ween Pin X6 and X9.

Design and Connections

Page 11DTI307_002-727e-03.15

4.3 Triaxial DiMod Type DTI307.3

The 3-channel DiMods 307.3 are designed as ex-boards

and are folded to small quarters with net 10x10x10 mm.

This offers a good method for mounting in the center of

a triaxial sensor. The solder pads for the 3 sensors and

the DTI cable are placed at the center board which is the

base plate after folding.

With a heat shrink cover the gross dimensions are smaller

than 11x11x11 mm. For special applications other designs

of folding may be used.

Fig. 8: DiMod Type DTI307.3, IC side

Fig. 9: DiMod Type DTI307.3, passive side

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 12

DTI GND -Sensor2

+RS-485 GND

-RS-485+Sensor2

DTI +VDC

C2CK

C2D

+5 V

+5 V13 8

121

-Sensor3

+Sensor3

GND

+5 V

GND

+Sensor1

-Sensor1

Fig. 10: DiMod Type DTI307.3 - solder pads. The pads

C2D and C2CK are pins for the controller update

and may not be connected.

4.4 TriaxialDiModTypeDTI307.3S

This DiMod contains 3 channels on a single board with

the dimensions 24,8x18,8x3 mm (LxWxH). The operation

is total compatible with the DiMod Type DTI307.3.

Fig. 11: DiMod Type DTI307.3S, IC side

Fig. 12: DiMod Type DTI307.3S, passive side

Design and Connections

Page 13DTI307_002-727e-03.15

307.03S

Sensor 1

Sensor 2

Sensor 3

C2CK

C2D

+5V

-RS-485

+5V

17 18

GND

DTI GND

GND

+Sensor 1

+RS-485

+Sensor2

+Sensor3

-Sensor 1

DTI VDC

-Sensor2

-Sensor3

24,8

18,8

Fig. 13: DiMod Type DTI307.3S - dimensions and solder

pads at the IC side.

GAINR

307.03S

Sensor 2

Sensor 1 Sensor 2

Sensor 3

Sensor 1

Sensor 3

STIMR

C2CK

C2D

+5V

-RS485

+5V

18 17

GND

DTI GND

GND

+Sensor2

+RS485

+Sensor1

+Sensor3

-Sensor2

DTI VDC

-Sensor1

-Sensor3

Fig. 14: DiMod Type DTI307.3S - solder pads on the

passive side. The pads C2D and C2K are for the

controller update and may not be connected.

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 14

5. Technical Data

5.1 AnalogSignalConditioning

Sensor input Instrumentation amplier

Analog devices AD8221ARM

Noise referred to the input (75 + 8 * Gamp)

Gamp

nV/Hz-2

Gamp = amplication factor AD8221

A/D converter BURR-BROWN ADS8320EB

16 Bits resolution, 15 Bits no missing codes

Operating level 0 ... 5 V at the input

Amplication factor Basis factor 2 before ADC

3 ... 500 as preamplication of the AD8221 with matched

resistor 0603 TK100

With preamplication < 3 reduced operating level

Shunt stimulation With analog switches at the 0 V and +5 V side

Solder pads for a shunt resistor 0603 TK100

Antialiasing lter 4 kHz edge frequency (‒3 dB), 4 poles

Butterworth characteristic

Tolerance ±0,2 dB at the edge frequency

Standard samplingrate 20 kHz

Technical Data

Page 15DTI307_002-727e-03.15

5.2 Digital Control

DTI bus connection RS-485 with signal level 3,3 V. No bus termination at the

DiMod side

Data formats Half duplex with RS-485

Command communication with 115,2 Bd

Data transfer 6 Mbit/s NRZ with scrambling

Internal clock Free running oscillator with auto adjust in the setup mode

Tolerance ±0,7 %

Sampling Control By central request via the RS-485 bus. Simultaneous

sampling with all DiMods

5.3 PowerSupply

Input voltage 5,2 ... 6 V. Low-drop-out input regulator

Sensor excitation 5 V + 0,075 V/‒0,125 V with max. 90 mA

Power Consumption without Sensor DiMod 307.1 60 mW

DiMod 307.3 120 mW

DiMod Digitization Module Type DTI307...

DTI307_002-727e-03.15Page 16

6. Labels

All labels of the 20 kHz Dimods have yellow color. Due to

the small DiMod dimensions the labels only carry some

typical characteristics.

Fig. 15: Labels of the 3-channel and 1-channel DiMods

with serial number, name and type

Parts of the UUID string always dene the serial number:

KISTXXXXXX

KIST is the manufacturer code and XXXXXX is a 6 cha-

racter serial number from which only the last 5 numbers

are on the label.

A 3-channel DiMod operates on the DTI bus side as three

1-channel DiMods. Therefore this DiMod must have 3 dif-

ferent UUI codes. The serial number on the label is the

lowest part of the serial number, the other 2 DiMods have

numbers which are incremented.

For example a 3-channel DiMod with the label 00015 has

the following UUID codes:

KIST000115 for sensor 1

KIST000116 for sensor 2

KIST000117 for sensor 3

Fig. 10, Fig. 13 and Fig. 14 show the sensor connecting

pads. The UUID in ascending order is the main criteria for

the identication of the sensor axis. More informations are

in the TEDS.

Amplication Factor and Shunt Stimulation

Page 17DTI307_002-727e-03.15

7. AmplicationFactorandShuntStimulation

DiMods are factory tted with resistors for amplication

and stimulation.

These resistors have the names:

GAINR determines the amplication factor

STIMR determines the stimulation sensivity

Both values are noted as user tags in the TEDS Memory.

The precise amplication factor of the DiMod is measured

at the factory nal test with a voltage calibrator and this

factor is printed in the DiMod specication sheet.

When the DiMod is physically calibrated with the enclosed

sensor, the system tag SENSB in physical units/LSB is

written to the system tag in the TEDS list.

The following gures show the positions of the resistors

on the boards Types DTI307.1, DTI307.1S, DTI307.3 and

DTI307.3S.

GAINR STIMR

307.01

Fig. 16: 1-channel DiMod Type DTI307.1: Position for

gain and stimuli resistors

X10

R5 R4 R2 R3

R30

STIMR GAINR

307.01S

Fig. 17: 1-channel DiMod Type DTI307.1S: Position for

gain and stimuli resistors

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Model: DTI307

Type: Owner's manual

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