Siemens ASIC SIM 1-2 Parts list manual

SIMATIC NET
ASIC
SIM 1-2
Function Manual
Preface
Area of Application and
Characteristics 1
Functional Description of
the SIM 1-2 2
Technical Specifications 3
Application Examples 4
Putting into Operation 5
Appendix A
Release 02/2007
C79000-G8976-C215-01

Siemens AG
Automation and Drives
Industrial Communication
Postfach 4848, D-90327 Nürnberg
Copyright © Siemens AG,
C79000-G8976-C215-01
Subject to technical change.
Siemens Aktiengesellschaft Printed in the Federal Republic of Germany 2
Classification of Safety-Related Notices
This document contains notices which you should observe to ensure your own
personal safety, as well as to protect the product and connected equipment. These
notices are highlighted in the manual by a warning triangle and are marked as follows
according to the level of danger:
Danger
indicates that death, severe personal injury will result if proper precautions are not
taken.
Warning
indicates that death, severe personal injury can result if proper precautions are not
taken.
Caution
with a warning triangle indicates that minor personal injury can result if proper
precautions are not taken.
Caution
without a warning triangle indicates that damage to property can result if proper
precautions are not taken.
Notice
indicates that an undesirable result or status can result if the relevant notice is
ignored.
Note
highlights important information on the product, using the product, or part of the
documentation that is of particular importance and that will be of benefit to the user.
Trademarks
SIMATIC®, SIMATIC NET®, SIMATIC NET Networking for Industry®, SINEC®,
SCALANCE®and SINAUT®are registered trademarks of Siemens AG.
Third parties using for their own purposes any other names in this document which
refer to trademarks might infringe upon the rights of the trademark owners.
Disclaimer
We have checked the contents of this manual for agreement with the hardware and
software described. Since deviations cannot be precluded entirely, we cannot
guarantee full agreement. However, the data in this manual are reviewed regularly
and any necessary corrections included in subsequent editions. Suggestions for
improvement are welcome.

SIM 1-2
C79000-G8976-C215-01
3
Safety Instructions Regarding your Product
Before you use the product described here, read the safety instructions below
thoroughly.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment .
Qualified persons are defined as persons who are authorized to commission, to
ground, and to tag circuits, equipment, and systems in accordance with established
safety practices and standards.
Correct Usage of Hardware Products
Note the following:
Warning
This device and its components may only be used for the applications described in the
catalog or the technical description, and only in connection with devices or
components from other manufacturers which have been approved or recommended
by Siemens.
This product can only function correctly and safely if it is transported, stored, set up,
and installed correctly, and operated and maintained as recommended.
Before you use the supplied sample programs or programs you have written yourself,
make certain that no injury to persons nor damage to equipment can result in your
plant or process.
EU Directive: Do not start up until you have established that the machine on which you
intend to run this component complies with the directive 98/37/EEC.
Correct Usage of Software Products
Note the following:
Warning
This software may only be used for the applications described in the catalog or the
technical description, and only in connection with software products, devices or
components from other manufacturers which have been approved or recommended
by Siemens.
Before you use the supplied sample programs or programs you have written yourself,
make certain that no injury to persons nor damage to equipment can result in your
plant or process.

SIM 1-2
C79000-G8976-C215-01
4
Prior to Commissioning
Prior to commissioning, note the following warning:
Caution
Prior to startup read the relevant documentation. For ordering data of the
documentation, please refer to catalogs or contact your local Siemens representative.

SIM 1-2
C79000-G8976-C215-01 5
Preface
Purpose of manual
This manual supports you during the development of a Fieldbus Medium
Attachment Unit (MAU) for 31.25 Kbps in compliance with IEC 61158-2 with the
SIM 1-2 (Siemens IEC MAU) and a small number of external components.
Which Data Link Layer protocol is implemented is irrelevant. In conjunction with a
suitable communication controller, for example SPC 2-4, devices with a fieldbus
attachment (supplied with power locally or over the bus) can be implemented with
little effort.
This manual serves both as a function manual and as a data sheet for the
developer of the electronics.
Aims
With the aid of this manual, you will be able to develop a fieldbus medium
attachment unit (MAU) for 31.25 Kbps for your application with little effort using the
SIM 1-2.
We assume that you are familiar with the relevant standards and specifications.
Certification
The products and systems listed in this document are manufactured and marketed
using a quality management system complying with DIN ISO 9001 and certified by
DQS (certificate register no. 2613). The DQS certificate is recognized in all IQNet
countries (Reg. No.: 2613).

Preface
SIM 1-2
6 C79000-G8976-C215-01

SIM 1-2
C79000-G8976-C215-01 7
Contents
1Area of Application and Characteristics ...................................................................... 9
1.1 Overview.............................................................................................................. 9
1.2 Essential Characteristics ................................................................................... 11
2Functional Description of the SIM 1-2 ........................................................................ 13
2.1 Block Diagram ................................................................................................... 13
2.2 Pin Description................................................................................................... 14
2.2.1 Pin Assignment.................................................................................................. 14
2.2.2 Pin Arrangement................................................................................................ 16
2.3 Basic Functions of the SIM 1-2.......................................................................... 17
2.3.1 Interfacing with the Bus Cable: VBUS and GND............................................... 17
2.3.2 Control Loop: CTR............................................................................................. 17
2.3.3 Current Sensing by SENSEP and SENSEM..................................................... 17
2.3.4 Bus Connector ................................................................................................... 18
2.3.5 Receiver Input: RXIN......................................................................................... 20
2.3.6 Impedance Converter Output/Input: VE/VESRD............................................... 20
2.3.7 Reference Circuit RIREF, RVCCVE, RVREG, RISOLL .................................... 20
2.3.8 Interface and Application Voltage VREG........................................................... 21
2.3.9 Internal Power Supply: VCCD/VCCA, VM......................................................... 21
2.3.10 Oscillator: XT0, XT1........................................................................................... 21
2.3.11 Digital Interface: TXE, TXS, RXA, RXS............................................................. 22
2.3.12 Test and Manufacturing Pins: TD, T0, T1, T2, TA............................................. 22
2.3.13 Mode Setting GIM and VCM.............................................................................. 22
2.3.14 Voltage Monitoring............................................................................................. 23
2.4 Power Supply of the Application........................................................................ 24
2.4.1 Power Supply VREG ......................................................................................... 24
2.4.2 Power Supply VE............................................................................................... 25
2.4.3 DC/DC Converters S1 and S2........................................................................... 26
2.4.4 Dimensioning the Backup Capacitor ................................................................. 27
2.5 Internal Functions .............................................................................................. 28
2.5.1 Impedance Converter ........................................................................................ 28
2.5.2 Shunt Regulator................................................................................................. 28
2.5.3 Signal Filter........................................................................................................ 28
2.5.4 Comparator, Carrier Detector ............................................................................ 29
2.5.5 Jabber Control ................................................................................................... 29
2.5.6 Wave Shaper ..................................................................................................... 29
2.5.7 Interface Logic ................................................................................................... 30
3Technical Specifications.............................................................................................. 31
3.1 Limit Values ....................................................................................................... 32
3.2 Normal Operating Conditions and Characteristic Data ..................................... 35
3.3 Housing MLPQ 40 ............................................................................................. 41
4Application Examples .................................................................................................. 45
4.1 Interface Logic ................................................................................................... 45
4.1.1 Overview of the Interface to the Communication Controller.............................. 45

Contents
SIM 1-2
8 C79000-G8976-C215-01
4.2 Power-saving Isolation with Optocouplers......................................................... 47
4.2.1 Internal Pulse Duration Modulator ..................................................................... 47
4.2.2 Internal Pulse Duration Demodulator ................................................................ 48
4.2.3 External Dynamic Signal Evaluation.................................................................. 51
4.3 Signal Assignment............................................................................................. 52
4.4 Circuit Examples................................................................................................ 53
4.4.1 Block Diagram of the SIM 1-2 and SPC 4-2 with Galvanic Isolation................. 53
4.4.2 Diagram of the SIM 1-2 and SPC 4-2 without Galvanic Isolation...................... 54
4.4.3 External Components (recommended values) .................................................. 55
4.4.4 Notes on the Transistor ..................................................................................... 56
4.5 Layout Proposal................................................................................................. 57
5Putting into Operation.................................................................................................. 59
5.1 Putting into Operation for the First Time............................................................ 59
5.2 Test Points......................................................................................................... 60
6Appendix ....................................................................................................................... 61
6.1 References ........................................................................................................ 61
6.2 Addresses.......................................................................................................... 62

SIM 1-2
C79000-G8976-C215-01 9
Area of Application and Characteristics 1
1.1 Overview
Examples of applications for the SIM 1-2
The SIM 1-2 (Siemens IEC MAU) allows the setting up of a fieldbus Medium
Attachment Unit (MAU) for 31.25 Kbps complying with IEC 61158-2 regardless of
the implemented data link layer protocol.
In conjunction with a suitable communication controller, for example, SPC 4-2,
devices with a fieldbus attachment can be implemented with little effort.
The SIM 1-2 supports all send and receive functions (including jabber control) and
the high-impedance decoupling of auxiliary energy from the bus cable.
It provides a selectable, stabilized power supply and also allows the setup of an
galvanically isolating power supply with a few passive components.
As an alternative to the standard signal interface (TxS, TxE, RxS, RxA), the ASIC
includes special interface logic that provides low power consumption and an easy-
to- implement interface for galvanic signal isolation.

Area of Application and Characteristics
SIM 1-2
10 C79000-G8976-C215-01
Block diagrams of examples
The following diagram illustrates examples of SIM 1-2 applications.
Bus-
Speisegerät
Power
VBUS+
VBUS-
Feldbus
SIM 1-2
VBUS+ VBUS-
Slave
Controller
Application
Controller
Aktor
SIM 1-2
VBUS+ VBUS-
Slave
Controller
Application
Controller
Sensor
SIM 1-2
VBUS+ VBUS-
SPC 4
Application
Controller
Sensor
Power

Area of Application and Characteristics
SIM 1-2
C79000-G8976-C215-01 11
1.2 Essential Characteristics
Description
The essential characteristics of the SIM 1-2 (IEC MAU) are listed below.
Characteristics of fieldbus attachment
Using the SIM 1-2, a fieldbus attachment can be implemented with the following
characteristics.
●The SIM 1-2 (IEC MAU) supports fieldbus attachments for 31.25 Kbps in
compliance with IEC 6 1158-2.
●The SIM 1-2 can be connected to all Manchester encoders/decoders in
compliance with IEC 61158-2.
As a result, the SIM 1-2 can also be connected to all fieldbus controllers that
already include a Manchester encoder/decoder in compliance with
IEC 61158 2.
●Jabber inhibit (jabber control prevents a node from transmitting indefinitely on
the bus)
●Sender with current modulator for bias currents:
–Asymmetric modulation from 2 mA to 10 mA
–Symmetric modulation from 10 to 50 mA
Power-optimized electrical isolation
The SIM 1-2 supports simple and power-minimized galvanic isolation between
MAU and user electronics by means of:
●Integrated voltage converter for power-optimized, unregulated voltage
transformation; external transformer and rectifier are required.
●Integrated interface logic for simple and current-saving galvanic signal
isolation, current consumption in permanent operation < 2 mA; 2 optocouplers
and suitable controller interface logic are necessary on the controller.

Area of Application and Characteristics
SIM 1-2
12 C79000-G8976-C215-01
Properties of the SIM 1-2
●Minimum space required for the MAU interface
●Minimum number of external components
●Little space required due to SMD housing MLPQ 40
●Ambient temperature range -40 to +85 °C
●Low current consumption for own supply
●Bus voltage 9 V to 32 V (functional range)
●Stabilized output voltage for the user:
–Can be set in the range from 2 V to 5 V (tolerance ±3 %)
–Up to 50 mA (total) available
●On-chip voltage reference
●On-chip voltage monitoring
●On-chip RESET and PDWN for safe power-up and power down management
of connected logic circuits

SIM 1-2
C79000-G8976-C215-01 13
Functional Description of the SIM 1-2 2
2.1 Block Diagram
Description
The following block diagram represents the SIM 1-2 functions as blocks.
GND
VE / VESRD
RXIN
SENSEM
BUS
(9 .. 32V)
-
TxM
UR
static current
(2 .. 50mA)
Impedance Converter
Current Modulator
Waveshaper
F = 31
,
25 kHz
Jabber
Control
Interface-
Logik
TXE
TXS
RXA2
RXS
Bandpass
2. Ordnung
Tiefpass
2.Ordnung
Shunt-
Regulator
6
,
3V
VCC-
Regulator
5V
Clock
Generator
Power
Management
Current control
VREG-
Regulator
VCCD / VCCA
VREG
DC/DC DC/DC
Control
RSENSEP
T1
US
Receiver Filter und Komparator
S1
RESETXN
PDWNXN
S2
RxF
REx1
CRXIN
CVE
CVCC
CVREG
CTR
TXE2
TXS2
RXA
RXS2
TXE1
TXS1
RXA1
RXS1
VBUS
RSENSEM
SENSEP
RVREG
Referenz control RVCCVE
RIREF
RISOLL
VM
VCM
GIM
CVM
CRVREG
RRVREG
CRISOLL
RRISOLL
RRIREF
CRVCCVE
RRVCCVE
RDCDC
RRDCDC
GND
Mode
DC/DC
Digitale Schnittstelle

Functional Description of the SIM 1-2
SIM 1-2
14 C79000-G8976-C215-01
2.2 Pin Description
2.2.1 Pin Assignment
Description
The following table describes the assignment of the pin numbers to the symbolic
pin names. The table also includes a brief description of the functions.
No. Name
I/O
* 1)
A/D
* 2)
Description
1 CTR O A Control output for controlling bus current over T1
2 SENSEP I/O A
Actual current sensing for the bus current control
and output of the startup bypass
3 SENSEM I/O A
Correction of the actual current sensing for the
bus current control by taking into account the
circulating currents over Pad CTR and VBUS
4 RIREF I/O A
Generation of an internal reference current with
possible external adjustment
5 RISOLL I/O A
Set reference for bus current control (2 mA to 50
mA corresponds to 0.1 MΩto 2.5 MΩ)
6 RVCCVE I/O A
Generation of an internal reference voltage and
at the same time measuring point for an external
adjustment to RIREF (target : U (RVCCVE) = 1
V)
7 RVREG I/O A
Set reference for VREG (2 V to 5 V corresponds
to 1.0 MΩto 2.5 MΩ)
8 GND P A Ground
9 VE P A
Regulated supply voltage (6.3 V), derived from U
(RVCCVE); regulated only in conjunction with
VESRD!
10 VESRD O A
Collector of the control transistor of the shunt
regulator
11 VREG P D
Regulated supply voltage (2 V to 5 V), derived
from VE and U (RVREG)
12 GND P D Ground
13 RxS O D Receive signal, output
14 RxA O D Receive activity, output
15 TxE I D Transmit enable, input
Table continued on next page
* 1) I = input, O = output, P = power
* 2) A = analog, D = digital

Functional Description of the SIM 1-2
SIM 1-2
C79000-G8976-C215-01 15
Continued
No. Name
I/O
* 1)
A/D
* 2)
Description
16 TxS I D Transmit signal, input
17 RESETXN O D Reset output for external logic supplied by VREG
18 PDWNXN O D
Power down – Prewarning signal for external
logic supplied by VREG
19 TD Must be connected to GND.
20 T0 Must be connected to GND.
21 S2 O D Switch output 2 of DC/DC converter, open drain
22 GND P D Ground
23 S1 O D Switch output 1 of DC/DC converter, open drain
24 t1 Must be connected to GND.
25 T2 Must be connected to GND.
26 VCM I D
Voltage converter mode – enabling of DC/DC
converter
27 GIM I D
Galvanic isolation mode – enabling of power-
saving interface
28 GND P D Ground
29 PROG P D Must be connected to VCCD.
30 VCCD P D Regulated supply voltage (5 V) for digital circuit
31 XT1 I/O D
Quartz or resonator connector, with external
clock supply XT1 used as input
32 XT0 I/O D
Quartz or resonator connector, with external
clock supply XT0 is connected to GND
33 VCCA P A Regulated supply voltage (5 V) for analog circuit
34 GND P A Ground
35 TA Must be connected to GND.
36 VM O A Middle voltage reference (derived from VCCA)
37 RDCDC I A
Reference for startup current of the DC/DC
converter
38 RXIN I A Input of receiver filter
39 GND P A Ground
40 VBUS P A
Connector for supplying the ASIC with the
rectified bus voltage
41 GND P A/D Chassis, metal surface below the housing
* 1) I = input, O = output, P = power
* 2) A = analog, D = digital

Functional Description of the SIM 1-2
SIM 1-2
16 C79000-G8976-C215-01
2.2.2 Pin Arrangement
Pin layout in the 40-pin housing 40LD MLPQ 6x6 VJJD-2
T0 TD PDWNXN RESETXN TxS TxE RxA RxS GND VREG
S2
GND
S1
T1
T2
VCM
GIM
GND
PROG
VCCD
VESRD
VE
GND
RVREG
RVCCVE
RISOLL
RIREF
SENSEM
SENSEP
CTR
XT1 XT0
VCCA
GND
TA
VM
RDCDC
RXIN
GND
VBUS
1
10
1120
21
3031 40
41

Functional Description of the SIM 1-2
SIM 1-2
C79000-G8976-C215-01 17
2.3 Basic Functions of the SIM 1-2
The basic functions described in this section are required for the minimum
functionality of the SIM 1-2.
2.3.1 Interfacing with the Bus Cable: VBUS and GND
The interfacing to the positive side of the bus system is over VBUS. Externally, at
least one diode must be included as polarity reversal protection to avoid both
destruction of the ASIC and return feed to the bus cable if a short-circuit occurs.
The interfacing to the negative side of the bus system is over GND.
As an alternative to a diode as polarity reversal protection, a rectifier bridge can be
used as polarity reversal protection and feedback protection.
2.3.2 Control Loop: CTR
This output controls the base of the external PNP transistor T1 that supplies the
local consumer connected to VE and switches to output signal to the bus by
modulating the current consumption.
2.3.3 Current Sensing by SENSEP and SENSEM
The shunt resistor RSENSEP is used to sense the current available as supply current
over the collector. The current fed past RSENSEP over VBUS and CRT is sensed by
the shunt resistor RSENSEM.
The sum of the two currents corresponds to the current taken from the bus.

Functional Description of the SIM 1-2
SIM 1-2
18 C79000-G8976-C215-01
2.3.4 Bus Connector
Bus Current Consumption
Using the resistor RRISOLL, the mean current taken from the bus is set from 2 mA to
50 mA. In the range from 2 mA to 10 mA, the SIM 1-2 automatically operates in
the asymmetric modulation mode. This means that to transmit, the mean current
consumption is raised to 10 mA and then lowered again to the set value.
The set mean bus current must always be at least 1 mA higher than the current
transferred to the application over VREG and VE (including DC/DC).
RRISOLL [MΩ] = 0.05 *IBUS [mA]
Conditions for RRISOLL: 100 KΩ≤RRISOLL ≤2.5 MΩ
the capacitor CVE must be dimensioned in the permitted range according to the
pulse load by the application or the DC/DC converter.
Caution 1
To achieve the minimum bus current tolerance of 3 %, resistors with a tolerance of
≤0.1 % must be used. As an alternative, the bus current can be matched over
RRISOLL (see also tolerance calculation in section 2.3.7, "Reference Circuit RIREF,
RVCCVE, RVREG, RISOLL“).
Caution 2
Transistor T1 and its cooling surface must be designed according to the set bus
current consumption and the resulting dissipation loss.

Functional Description of the SIM 1-2
SIM 1-2
C79000-G8976-C215-01 19
Input Impedance
To achieve the impedance of 3 kΩrequired by IEC 61158-2 at the bus attachment
terminals in conjunction with the transistor PZT3906, the EMC capacitances
parallel to the bus connector must be limited as follows:
2 mA < IBUS ≤15 mA, CEMC ≤500 pF
Starting at an IBUS current of 15 mA, the capacitance of CEMC must be reduced
continuously. This results in a curve with the following vertices:
I
BUS C EMC
20 mA CEMC ≤340 pF
30 mA CEMC ≤190 pF
40 mA CEMC = 0 pF
As of a current of ≥40 mA, CEMC remains = 0 pF.
At IBUS currents > 40 mA, the required impedance (at 39 kHz) for bus voltages UBUS
< 12 V is not achieved.
System Stability
We recommend the transistor PZT3906.
If you set the IBUS current to ≥30 mA, you should use an additional L_SENSE
inductor of 1 µH. This avoids self-excitation and increases system stability.
The L_SENSE inductor is connected in series with R_SENSEP and is not included
in the layout proposal in this manual.
As the inductor, we recommend the B82422H from the EPCOS series. If
necessary, correct the value of R_SENSEP to achieve the required 10 Ωwith the
desired accuracy.
SENSEM
SENSEP
R_SENSEM R_SENSEP L_SENSE
2
3

Functional Description of the SIM 1-2
SIM 1-2
20 C79000-G8976-C215-01
2.3.5 Receiver Input: RXIN
The received signal is coupled into the input filter over the external capacitor CRXIN
(220 pF) and REX1 (10 kΩ).
2.3.6 Impedance Converter Output/Input: VE/VESRD
These two connectors must be directly connected with each other and then over
RSENSEP with the collector of the external transistor T1 and the external energy
storage CVE. The voltage at VE/VESRD is regulated to a constant 6.3 V.
2.3.7 Reference Circuit RIREF, RVCCVE, RVREG, RISOLL
Connect the contacts to the specified reference resistors.
Contact
Reference
resistor
Meaning
RIREF RRIREF All internal references are derived from the current
flowing through RRIREF.
RVCCVE RRVCCVE RRVCCVE forms the reference for VCC and VE. The
RVCCVE pin must be backed up to GND by
capacitor CRVCCVE.
RVREG RRVREG RRVREG forms the reference for VREG. The RVREG
pin must be backed up to GND by capacitor CVREG.
RISOLL RRISOLL RRISOLL sets the middle current taken from the bus
system.
Notice:
The tolerance of reference resistors is included in the tolerance of the bus current.
You can achieve the minimum tolerance of 3 % with resistors that have a tolerance
of ≤0.1 %. As an alternative, the bus current can be adjusted over RRISOLL.