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Siemens ASIC SIM 1-2 Function Manual

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

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Summary of Contents for Siemens ASIC SIM 1-2

  • Page 1 Preface Area of Application and Characteristics Functional Description of SIMATIC NET the SIM 1-2 ASIC Technical Specifications SIM 1-2 Application Examples Function Manual Putting into Operation Appendix Release 02/2007 C79000-G8976-C215-01...
  • Page 2 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.
  • Page 3 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.
  • Page 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...
  • Page 5 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...
  • Page 6 Preface SIM 1-2 C79000-G8976-C215-01...

  • Page 7: Table Of Contents

    Contents Area of Application and Characteristics ..............9 Overview......................9 Essential Characteristics ................... 11 Functional Description of the SIM 1-2 ................ 13 Block Diagram ....................13 Pin Description....................14 2.2.1 Pin Assignment....................14 2.2.2 Pin Arrangement....................16 Basic Functions of the SIM 1-2................17 2.3.1 Interfacing with the Bus Cable: VBUS and GND..........
  • Page 8 Contents 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 Signal Assignment ..................... 52 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......

  • Page 9: Area Of Application And Characteristics

    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.
  • Page 10 Area of Application and Characteristics Block diagrams of examples The following diagram illustrates examples of SIM 1-2 applications. VBUS+ Bus- Feldbus Speisegerät VBUS- VBUS- VBUS- VBUS- VBUS+ VBUS+ VBUS+ SIM 1-2 SIM 1-2 SIM 1-2 Power Slave Slave SPC 4 Controller Controller Application...

  • Page 11: Essential Characteristics

    Area of Application and Characteristics 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.
  • Page 12 Area of Application and Characteristics 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 ●...

  • Page 13: Functional Description Of The Sim 1-2

    Functional Description of the SIM 1-2 Block Diagram Description The following block diagram represents the SIM 1-2 functions as blocks. Receiver Filter und Komparator RXA2 Bandpass Tiefpass RXA1 2. Ordnung 2.Ordnung RXIN RXS2 RXS1 RXIN Interface- Jabber VBUS Logik Control Waveshaper (9 ..

  • Page 14: Pin Description

    Functional Description of the SIM 1-2 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. Name Description * 1) * 2) 1 CTR Control output for controlling bus current over T1...
  • Page 15 Functional Description of the SIM 1-2 Continued Name Description * 1) * 2) 16 TxS Transmit signal, input 17 RESETXN O Reset output for external logic supplied by VREG 18 PDWNXN Power down – Prewarning signal for external logic supplied by VREG 19 TD Must be connected to GND.

  • Page 16: Pin Arrangement

    Functional Description of the SIM 1-2 2.2.2 Pin Arrangement Pin layout in the 40-pin housing 40LD MLPQ 6x6 VJJD-2 VESRD RVREG RVCCVE RISOLL RIREF SENSEM PROG SENSEP VCCD SIM 1-2 C79000-G8976-C215-01...

  • Page 17: Basic Functions Of The Sim 1-2

    Functional Description of the SIM 1-2 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.

  • Page 18: Bus Connector

    Functional Description of the SIM 1-2 2.3.4 Bus Connector Bus Current Consumption Using the resistor R , the mean current taken from the bus is set from 2 RISOLL . In the range from 2 mA to 10 mA, the SIM 1-2 automatically operates in the asymmetric modulation mode.
  • Page 19 Functional Description of the SIM 1-2 Input Impedance To achieve the impedance of 3 kΩ required 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 <...

  • Page 20: Receiver Input: Rxin

    Functional Description of the SIM 1-2 2.3.5 Receiver Input: RXIN The received signal is coupled into the input filter over the external capacitor C RXIN (220 pF) and R (10 kΩ). 2.3.6 Impedance Converter Output/Input: VE/VESRD These two connectors must be directly connected with each other and then over with the collector of the external transistor T1 and the external energy SENSEP storage CVE.

  • Page 21: Interface And Application Voltage Vreg

    Functional Description of the SIM 1-2 Tolerance Calculation The tolerance of I and V is made up the tolerance of the chip and the tolerance of the reference resistors used R RIREF RVCCVE RVREG RISOLL SENSEM and R . The precise relationships can be seen in the following formulas. SENSEP = |d | + |d...

  • Page 22: 2.3.11 Digital Interface: Txe, Txs, Rxa, Rxs

    Functional Description of the SIM 1-2 2.3.11 Digital Interface: TXE, TXS, RXA, RXS Possible interconnection between the external interface circuit, for example SPC 4-2, and the SIM 1-2: ● Direct connection of TXE, TXS, RXA, RXS with the digital input and output drivers of an external communication controller for the external application electronics.

  • Page 23: 2.3.14 Voltage Monitoring

    Functional Description of the SIM 1-2 Voltage Converter Mode (VCM) This input is used to activate or deactivate the DC/DC converter controller. Meaning High The DC/DC converter is active and controls the outputs S1, S2. The DC/DC converter is disabled, the outputs S1, S2 are switched with high impedance.

  • Page 24: Power Supply Of The Application

    Functional Description of the SIM 1-2 Power Supply of the Application For the power supply of the external application electronics, it is only ever possible to take as much energy as is taken on average from the bus system less the power consumption of the SIM 1-2 itself.

  • Page 25: Power Supply Ve

    Functional Description of the SIM 1-2 2.4.2 Power Supply VE Caution The VE voltage of 6.3 V generated by the shunt regulator cannot be used immediately after turning on the power supply of the external application electronics since this can disrupt the startup of the SIM 1-2 considerably. On completion of the startup phase (indicated by RESETXN), the VE voltage can be used to supply the external application electronics.

  • Page 26: Dc/Dc Converters S1 And S2

    Functional Description of the SIM 1-2 2.4.3 DC/DC Converters S1 and S2 These outputs are switches for setting up a DC/DC converter. By connecting a transformer, a push-pull transformer for the power supply of a non-floating load can be implemented. Two stages of the DC/DC converter start up as soon as a stable VE supply voltage is present: in other words, before RESET becomes inactive.

  • Page 27: Dimensioning The Backup Capacitor

    Functional Description of the SIM 1-2 2.4.4 Dimensioning the Backup Capacitor To allow a correct startup behavior, the set constant current consumption and the backup capacitors C and C must be matched up. DCDC Secondary capacitor C DCDC The dimensions of the secondary capacitor of transformer C must not be too DCDC large depending on the constant current:...

  • Page 28: Internal Functions

    Functional Description of the SIM 1-2 Internal Functions 2.5.1 Impedance Converter The impedance converter/current modulator and current control function units together along with a few external components and the internal shunt regulator form the high-impedance decoupling of the auxiliary power from the bus cable. 2.5.2 Shunt Regulator The shunt regulator derives a stabilized voltage VE from the constant current.

  • Page 29: Comparator, Carrier Detector

    Functional Description of the SIM 1-2 2.5.4 Comparator, Carrier Detector From the filtered received signal RxF, the comparator forms a logic signal RxS2 suitable for further processing. A carrier detector also monitors the received signal and generates the carrier detect signal RxA2 dependent on the signal amplitude. 2.5.5 Jabber Control If a node is malfunctioning so that it constantly tries to transmit data via the bus...

  • Page 30: Interface Logic

    Functional Description of the SIM 1-2 2.5.7 Interface Logic The interface logic forms the interface to the communication controller of the user electronics. Three operating modes are possible: Without galvanic isolation If galvanic isolation of the bus interface (MAU) from the application-specific electronics is not required, the send or received signals with GIM = L on the interface are passed on without any processing and switched through to the user electronics.

  • Page 31: Technical Specifications

    Technical Specifications This section contains the technical specifications of the SIM 1-2. SIM 1-2 C79000-G8976-C215-01...

  • Page 32: Limit Values

    Technical Specifications Limit Values Description The following table lists the limit values of the SIM 1-2 that must not be exceeded! Caution These maximum operating conditions must not be exceeded under any circumstances, otherwise the SIM 1-2 may be destroyed. All voltages relate to GND.
  • Page 33 Technical Specifications Values for supply VCC Name/pin Parameters Unit Remark VCCA, VCCD Supply voltage -0.3 I (VCCA) + I Load current Maximum is peak (VCCD) value if a short occurs (flows over VCCA) VM, TEST1, Voltage at the inputs and -0.3 VCCA TEST2, RDCDC,...
  • Page 34 Technical Specifications Values for environmental influences and processing Name/pin Parameters Unit Remark Ambient temperature °C Storage temperature °C Junction operating °C Operating junction temperature (preliminary) Temperature Heat transfer resistance Thermal resistance th j-a junction/environment from junction to ambient in free air Housing Solder profile Pb free...

  • Page 35: Normal Operating Conditions And Characteristic Data

    Technical Specifications Normal Operating Conditions and Characteristic Data Note The following tables list the normal operating conditions and characteristic data of the SIM 1-2 and are structured according to the corresponding power supply. The information covers the spread of values that must be kept to at a bus voltage VBUS of 9 V to 32 V and an ambient temperature of –40 °C to 85 °C.
  • Page 36 Technical Specifications Values for bus interfacing Name/pin Parameters Typ. Unit Remark Bus voltage 32.0 Not applied directly to SIM 1-2. Static minimum 1,94 2,06 Tolerance +/-3 % bus current Static maximum 48,5 51,5 Tolerance +/-3 % bus current Modulation 16.0 17.5 19.0 Peak-to-peak value...
  • Page 37 Technical Specifications Values for supply VE Name/pin Parameters Typ. Unit Remark Voltage at shunt Tolerance +/-3 6,111 6,489 VESRD regulator PDWNXN Prewarning 0.9 * threshold for SOLL PDWNXN RESETXN Reset threshold 0.9 * for RESETXN VREG SOLL I (VE) Own current µA DC/DC function requirements...
  • Page 38 Technical Specifications Name/pin Parameters Typ. Unit Remark VCCA, Supply voltage 4.75 5.25 Only used VCCD internally. Capacitance at 3,63 µF Tantalum VCC pin TAJA105K016R, TAJA335K016R Middle voltage 0.5 * VCCA Capacitance at Ceramic 6.3 V VM pin XT0. XT1 Clock generation 1.99 2.01 Tolerance +/0.5...
  • Page 39 Technical Specifications Values for DC/DC activation Name/pin Parameters Typ. Unit Remark S1, S2 Terminal 2 * VE Internally or voltage S1 and externally limited S2 (see section 2.4.3) I (S1), I (S2) Load current considered as mean Ω Per switch DSON DSON switches S1...
  • Page 40 Technical Specifications Values for environmental influences Name/pin Parameters Typ. Unit Remark Ambient °C In operation temperature SIM 1-2 C79000-G8976-C215-01...

  • Page 41: Housing Mlpq 40

    Technical Specifications Housing MLPQ 40 Drawing of the Housing SIM 1-2 C79000-G8976-C215-01...
  • Page 42 Technical Specifications Housing Dimensions The following table lists the dimensions of the housing in millimeters. Meaning Min. Typical Max. 0.02 0.05 4.15 4.25 4.15 4.25 0.03 0.15 0.18 0.25 0.30 SIM 1-2 C79000-G8976-C215-01...
  • Page 43 Technical Specifications Manufacturing Notes Caution 1 The ESD protection measures must always be adhered to for all electronic components. Caution 2 The SIM 1-2 is a component at risk of cracking that must be handled as such. • Before processing the SIM 1-2, it must be subjected to a drying process if the chip has been stored for more than 168 hours without being dry packed (according to JEDEC J-STD-020C Moisture Sensitivity Level 3).
  • Page 44 Technical Specifications SIM 1-2 C79000-G8976-C215-01...

  • Page 45: Application Examples

    Application Examples Interface Logic 4.1.1 Overview of the Interface to the Communication Controller The interface logic forms the interface to the communication controller of the user electronics. As shown in the following diagram, three modes are possible. ● Without galvanic isolation If galvanic isolation of the bus interface (SIM1-2) from the application-specific electronics is not required, the send or received signals are passed on without any processing and switched through to the user electronics.
  • Page 46 Application Examples SIM 1-2 C79000-G8976-C215-01...

  • Page 47: Power-Saving Isolation With Optocouplers

    Application Examples Power-saving Isolation with Optocouplers 4.2.1 Internal Pulse Duration Modulator Description of the Signal Shaping in the Modulator In Galvanic Isolation Mode (GIM = H), the PD modulator converts the serial signal to be transferred into a duration modulated pulse train in which the rising edge of the send signal is assigned a long pulse and the falling edge a short pulse.

  • Page 48: Internal Pulse Duration Demodulator

    Application Examples 4.2.2 Internal Pulse Duration Demodulator Description of the Input Evaluation In Galvanic Isolation Mode (GIM=H) the wanted signal for the PD demodulator is obtained from the collector signal of the optocoupler transistor using a comparator. The signal transitions (especially during operation with low currents) behave differently over time depending on the characteristics of the optocoupler itself and its circuitry.
  • Page 49 Application Examples Description of the Signal Evaluation The leading edge on an incoming pulse ➁ triggers a time stage with a run time of t3. The following time condition applies: t1 < t3 < t2. On expiry of t3, a scan for pulse length t1 or t2 is performed. Depending on the detected pulse length t1 or t2, the flip-flop FF 1 is set to L or H.
  • Page 50 Application Examples Signal Evaluation in the Demodulator SIM 1-2 C79000-G8976-C215-01...

  • Page 51: External Dynamic Signal Evaluation

    Application Examples 4.2.3 External Dynamic Signal Evaluation Description of the Dynamic Input Evaluation The circuit below is an example of retrieving the useful signal from the collector signal of the optocoupler transistor for the downstream communication controller in galvanic isolation mode. The two voltage dividers R2/R3 and R4/R5 move the working range of the comparator to the middle of the SPC-4–2 supply voltage V .

  • Page 52: Signal Assignment

    Application Examples Signal Assignment Description On the SIM 1-2, the signals are assigned in compliance with the IEC 61158-2 standard. The figure below describes the assignment of the logical state of TxS to the signal adjustment VBus+—VBus- (or the assignment of VBus+—VBus- to RxS).

  • Page 53: Circuit Examples

    Application Examples Circuit Examples 4.4.1 Block Diagram of the SIM 1-2 and SPC 4-2 with Galvanic Isolation SIM 1-2 C79000-G8976-C215-01...

  • Page 54: Diagram Of The Sim 1-2 And Spc 4-2 Without Galvanic Isolation

    Application Examples 4.4.2 Diagram of the SIM 1-2 and SPC 4-2 without Galvanic Isolation SIM 1-2 C79000-G8976-C215-01...

  • Page 55: External Components (Recommended Values)

    Application Examples 4.4.3 External Components (recommended values) If you want to achieve the described accuracy of the SIM 1-2, the SIM 1-2 must be connected to the external components listed in the following table. Name Meaning Type Rated value Unit Tolera Temp.

  • Page 56: Notes On The Transistor

    Application Examples 4.4.4 Notes on the Transistor As an alternative to the recommended transistor PZT3906, the transistor PZT2907A can be used for I currents ≥ 10 mA. However to increase system stability (avoiding self excitation) an inductor (3.3 µH) must be included in series in addition to the RSENSEP measuring resistor (see section 2.3.3, "Current Sensing by SENSEP and SENSEM“).

  • Page 57: Layout Proposal

    Application Examples Layout Proposal To ensure optimum functionality of the SIM 1-2, certain layout rules should be adhered to. ● Connection from pin CRT to base of T1 as short as possible ● Connection from SENSEP over RSENSEP to capacitor CVE and connection from SENSEM over RSENSEM to capacitor CVE as short as possible and symmetrical ●...
  • Page 58 Application Examples SIM 1-2 C79000-G8976-C215-01...

  • Page 59: Putting Into Operation

    Putting into Operation Putting into Operation for the First Time Description Before putting into operation for the first time, check the correct wiring and components according to the block diagrams. In particular, check the reference resistances R and R and the connection VE/VESRD and RIREF RISOLL RVCCVE...

  • Page 60: Test Points

    Putting into Operation Test Points Description To check the functionality, the following measurements can be made during operation. Measured Description value Voltage at pin VE/VESRD = 6.3 V Voltage at pin VCCA/VCCD = 5.0 V VREG Voltage at VREG pin according to R tolerance RVREG IBUS...

  • Page 61: Appendix

    Appendix References IEC 61158-2 Digital data communications for measurement and control – Fieldbus for use in industrial control systems, Part 2: Physical layer specification and service definition PROFIBUS Test Guidelines for Field Devices according to "PROFIBUS-PA Profile for Process Control Devices, Version 3.0“, Version 3.1, April 2000, Order number 2.061 FOUNDATION™...

  • Page 62: Addresses

    PROFIBUS User Organization Geschäftsstelle Hr. Dr. Wenzel Haid- und Neu- Straße 7 76131 Karlsruhe, Germany Tel.: +49 721 9658 590 Technical Information in Germany and Europe Siemens AG A&D SE RD73 Postfach 2355 90713 Fürth, Germany Tel.: +49 911 750 2080 Fax:...

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