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.
©2015 Kistler Group. All rights reserved.
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
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. AmplicationFactorandShuntStimulation ..........................................................................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 ampliers
Matching measuring ampliers (charge ampliers, pi-
ezoresistive ampliers, etc.), displays and charge ca-
librators
Electronic control, monitoring and evaluation units as
well as software for specic 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 ofce 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 amplier 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
A
D
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 amplier requires
no need for a programmable amplication. The amplica-
tion factor is adjusted at the amplier 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.
10
8
9
19
6
A B C D E F G H
-S
+5V
GND
GND
-RS-485
+RS-485
+S
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 UniaxialDiModTypeDTI307.1S
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 conguration 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
X10
-RS-485
+RS-485
VCC
GND
-U
+S
+U
-S
R6
R5 R4 R2 R3
X1
X2
X3
5X 4X
X6
X7
X8
X9
-RS-485
+RS-485
VCC
GND
-U
+S
+U
-S
R30
STIMR GAINR
307.01S
307.01S
X5, X10 - Sensor connections
over dropping resistor
22
8
Fig. 6: DiMod Type DTI307.1S connecting pads
DiMod Digitization Module Type DTI307...
DTI307_002-727e-03.15Page 10
+
3
Rg
Rg IC14
AD8221ARM
4
1
2
5V
X10
X8
X7
X9
X6
X5
R6
SEL
R3
SEL
R2
SEL
R4
SEL
R5
SEL
R30
SEL STIMR
R28
SEL
R26
2k2
R27
2k2
C48
330p
C49
330p
C42
4n7
VDD
+ANA3
-ANA3
GND
GAINR
PIN
Fig. 7: DiMod Type DTI307.1S, input conguration 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
5
6
7
16
15
14
121
17
18
2
3
4
11
10
9
-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 TriaxialDiModTypeDTI307.3S
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 1
Sensor 2
Sensor 2
Sensor 3
Sensor 3
C2CK
C2D
+5V
-RS-485
+5V
+5V
5
9
1
13
17 18
8
12
4
16
7
11
3
15
6
10
2
14
GND
DTI GND
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
GAINR
307.03S
Sensor 2
Sensor 1 Sensor 2
Sensor 3
Sensor 1
Sensor 3
STIMR
STIMR
STIMR
C2CK
C2D
+5V
-RS485
+5V
+5V
5
9
1
13
18 17
8
12
4
16
7
11
3
15
6
10
2
14
GND
DTI GND
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 AnalogSignalConditioning
Sensor input Instrumentation amplier
Analog devices AD8221ARM
Noise referred to the input (75 + 8 * Gamp)
Gamp
nV/Hz-2
Gamp = amplication factor AD8221
A/D converter BURR-BROWN ADS8320EB
16 Bits resolution, 15 Bits no missing codes
Operating level 0 ... 5 V at the input
Amplication factor Basis factor 2 before ADC
3 ... 500 as preamplication of the AD8221 with matched
resistor 0603 TK100
With preamplication < 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 PowerSupply
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 dene 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 identication of the sensor axis. More informations are
in the TEDS.
Amplication Factor and Shunt Stimulation
Page 17DTI307_002-727e-03.15
7. AmplicationFactorandShuntStimulation
DiMods are factory tted with resistors for amplication
and stimulation.
These resistors have the names:
GAINR determines the amplication factor
STIMR determines the stimulation sensivity
Both values are noted as user tags in the TEDS Memory.
The precise amplication factor of the DiMod is measured
at the factory nal test with a voltage calibrator and this
factor is printed in the DiMod specication 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
R6
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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