mass calibration board

8/12/2019 Mass Calibration Board

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Rev. 0.07 Copyright 2005, ZMD AG, 23.05.2006 2/17 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the priorwritten consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.

ZMD31xxxKIT Mass Calibration Board Hardware for ZMD Mass Calibration Solution

Datasheet ZMD Mass Calibration Board MCB V2.0 Preliminary

Important Note

Restrictions in Use

ZMDs Mass Calibration System MCS, consisting of a communication board CB, a masscalibration board MCB and the mass calibration software, is designed for sensor modulesevaluation, laboratory setup and the modules mass calibration development only.

ZMDs Mass Calibration System MCS must not be used for module production and

production test setups.

Disclaimer

ZMD AG shall not be liable for any damages arising out of defects resulting from (i)delivered hard- and software (ii) non-observance of instructions contained in this manual, or(iii) misuse, abuse, use under abnormal conditions or alteration by anyone other than ZMDAG. To the extent permitted by law ZMD AG hereby expressly disclaims and user expresslywaives any and all warranties, wether express, implied or statutory, including, without

limitation, implied warranties of merchantability and of fitness for a particular purpose,statutory warranty of non-infringement and any other warranty that may arise by reason of


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Content page

1. CIRCUIT DESCRIPTION ..............................................................................................................................4

1.1 COMMUNICATION INTERFACE ..................................................................................................................4 1.2 P OWER S UPPLY OPTIONS .......................................................................................................................4 1.3 COMMUNICATION OPTIONS ......................................................................................................................4

1.3.1. Using I2C-Interface ........................................................................................................................5 1.3.2. Using OWI-Interface ......................................................................................................................5 1.3.3. Using LINwire-Interface ................................................................................................................5

1.4 ANALOG VOLTAGE OUTPUT MEASUREMENT .........................................................................................5 1.5 M ASS C ALIBRATION REFERENCE BOARD MCR ....................................................................................5 1.6 DUT C ONTROL ........................................................................................................................................5 1.7 MCB J UMPER S ETUP ..............................................................................................................................6

2. ELECTRICAL SPECIFICATIONS ..............................................................................................................6

3. MASS CALIBRATION BOARD SCHEMATICS AND PIN ASSIGNMENT ......................................7

4. MASS CALIBRATION BOARD PCB ...................................................................................................10

5. COMMUNICATION PHILOSOPHY ..........................................................................................................11

5.1 COMMANDS OF THE M ASS C ALIBRATION BOARD ................................................................................11 5.2 EXAMPLES OF VISUALB ASIC 6 SOURCE CODE ...............................................................................12

6. APPLICATION HINTS ................................................................................................................................13

6.1 HIGHER DUT S UPPLY VOLTAGES THAN MCBS S UPPLY VOLTAGE ...................................................13 6.2 LOWER DUT S UPPLY VOLTAGES THAN MCBS S UPPLY VOLTAGE ....................................................14

6.3 DUTS OUTPUT VOLTAGE MEASUREMENT USING MCB .......................................................................14


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1. CIRCUIT DESCRIPTION1.1 Communication Interface

the ZMD Mass Calibration System is interfaced to a common PC or Notebook via the standardcommunication board (CB) of ZMDs SSC Evaluation. For a detailed description of CB, USBcommunication between CB and PC and driver installation refer CBs documentation and datasheetZMD31xxxKIT_CommBoard_DS_Rev_*.pdf.

Communication is managed by the CB. CB generates communication pattern for DUTs and receivesDUTs answer. MCB is listening communication between PC and CB, interprets full command set andhandles powering on and communication access to DUTs to be accessed.

MCB receives data via the RXD pin of CB (connector K3 or K4). MCB answers via the D2 pin, allconnected MCBs are parallel at the port. CBs answer to PC can be verified at the TXD pin.

1.2 Power Supply Options

The main power supply of the MCB is realized by a common 7805 type linear voltage regulator. Itsprimary supply voltage must be within a range of (8 to 16) VDC. By short circuit of the jumpers K5 andK14 (to int (5P)) no additional power supply is required for DUTs with 5V power supply.

For supplying the DUTs with voltages below 5 VDC it is possible to connect an external power supplyvia the screw terminals KL2 (for the DUTs) and KL3 (for the communication). In this case the jumper K5must be left open and the jumper K14 must be short circuit with extern. It is recommended supplyboth the DUTs and the communication from the same power supply to avoid malfunctions duringcommunication.

The LED D3 displays the status of the power supply of the MCBs C.

1.3 Communication optionsThe Mass Calibration Board supports I 2C (1) -, LINwire (2) - and ZACwire (3) -communication. By the

jumper K11 and K15 the user has to adjust the chosen kind of communication manually before turningON the power supply. The communication is controlled by the SSC Communication Boards C only,the C of the MCB controls the DUTs multiplexing only and communicates via a separate channel withthe C of the Communication Board. Thus, the jumpers K12 and K16 are used for board test only andhave to left open for normal operation.

Basically the jumpers K9 and K10 are not assembled and are left open because of the drive capabilityof the bi-directional I 2C bus repeater IC3. But if there are very heavy capacitive loads at the SCL- orSDA-line it may be necessary to short circuit one or both of them to increase the drive capability and tofulfil the timing requirements of the I 2C protocol again.

To program the C of the MCB a common UART interface is used. By the connector K1 the Csfirmware can be transferred from a PC or Notebook to its EEPROM.

By the push button S1 the C of the MCB can be reset manually.


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A number of 8 MCBs can be connected in series via the plug connectors K2 and K3. Only the MCBwith the hardware address h0 is connected with a communication board at K2. The user has to adjustevery single MCB address manually by short circuiting (or not) the three terminals of jumper K4. Thecorrect sequence of the MCBs addresses must be regarded (inverted logic: floating jumper = 0). TheLEDs D4/D5/D6 display the adjusted address of the MCB.

Both communication lines SDA & SCL for I2C respectively OUT for OWI are pulled with 4.7k on MCB.Pullup resistor and communication line load capacitance has to be adapted in application to selectedcommunication speed.

Pullup resistor has to be adapted to communication speed and load conditions on communication lines.This is described in detail in DUTs SSC IC communication conditions (refer datasheet of the used ZMDSensor Signal Conditioner IC). So MCBs pullup resistor can be to high for ZACwire communication withhigh load capitance at DUTs analog output. In this case it is possible to switch parallel an additionalpullup resistor at/in DUT connector between:

- Pin 1 and Pin 3 of DUT connector for SCL

- Pin 1 and Pin 5 of DUT connector for SDA or one wire communication

1.3.1. Using I2C-Interface

1.3.2. Using OWI-InterfaceFor OWI communication MCBs pullup resistor and summarized capacitive load (DUTs/sensor modulesload capacitor at -pin & communuication cable) has to be fitted. A load capacitance of 15nFrequires approx. 330 pullup resistor and 2.2nF requires approx. 4.7k . Refer OWI protocol and timingdescription for used ZMD SSC IC for details.

1.3.3. Using LINwire-InterfaceLINwire communication is not evaluated up to now.

1.4 Analog Voltage Output Measurement

At the screw terminal KL4 the analog output voltage of a single DUT can be measured, if the jumper K6is left open. When short circuiting K6, then KL4 is short circuit to GND. The addressing of the DUT iscontrolled by the Mass Calibration Software. Basically the jumper K6 should be left open.

1.5 Mass Calibration Reference Board MCRMCR can be used for communication verification of software and MCB. MCR supports I2C and OWIcommunication. Output/load capacitance of MCR at pin OUT is 2.2nF.

MCR contains sensor bridge replacement. Refer MCR description for details of gain adjustment andsample calibration of MCR.

1.6 DUT Control


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A DUT can be connected via common rectangular board connector with plug locking. By a PMOStransistor the power supply of the DUT is switched ON/OFF, controlled by the Mass CalibrationSoftware. This allows the multiplexing of the DUTs and an addressed access to every single DUT.Depending on the chosen kind of communication (I 2C/LINwire/ZACwire) the regarding line is connectedvia electronic switches controlled by the mass calibration software.

1.7 MCB Jumper SetupPower supply options Communication optionsJumper no.

internal{int(5V)}

external{extern}

I2C OWI(ZACwire)

LINwire remarks

shortInternal supply mode:

MCB, DUT and Communication is powered byMCBs 5V supply voltage regulator

(via KL1 with 8-16V VDC)

K14

shortExternal supply mode:

-> DUT-power supply via KL2 (VDD_DUT)-> communication supply via KL3 (I2C Power)

short Communication supply = +5VK5

floatingexternal supply mode:

-> DUT-power supply via KL2 (VDD_DUT)-> communication supply via KL3 (I2C Power)

short SDA line for I2

C communicationshort SDA line for ZACwire - communicationK11 / K15short SDA line for LINwire - communication

K4(Bit 0/1/2)

Depending on address0 = floating / 1 = short circuited jumper

3 bit binary weighted MCB address

K6 connector parallel to KL4 (analog output measurement)

K12 / K16 floating no access

2. ELECTRICAL SPECIFICATIONS

Parameter Name Conditions min max unitVSUPP via KL1 MCB supply voltage 8 16 VDCISUPP via KL1 MCB supply current depends on number of DUTs connected to MCB 40 300 mAVDUT via KL2 separate DUT supply voltage 2,7 5,5 VDCIDUT via KL2 separate DUT supply current depends on number of DUTs connected to MCB 10

mA/DUT VI2C via KL3 separate I

2C bus supply voltage 2,7 5,5 VDCII2C via KL3 separate I

2C bus supply current depends on the load to be driven at I 2C bus 100 mAVOUT via KL4 analog output voltage of a DUT 0,05 0,95 V DUT IOUT via KL4 load current at analog output 2 mAVSUPP via K2-n supply voltage of DUT n n = (01 to 24 ) per MCB 2,7 5,5 VDCISUPP via K2-n supply current of DUT n 10 mA


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3. MASS CALIBRATION BOARD SCHEMATICS AND PIN ASSIGNMENT

Schematic is delivered only with documentation for sold MCS!

mass calibration board schematic part 1: MCB central control circuit


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Schematic is delivered only with documentation for sold MCS!

mass calibration board schematic part 2: dual DUT control circuit

Pin number (MCB conn. K2+K3) Signal Remarksall even pin numbers GND connected with the negative MCB board supply

1/3/5/7/9/15/17/19/21/23/31/33/37 n.c. internally not connected11 SSC-SCL buffered clock signal for communication13 SSC-SDA1 buffered data signal for communication25 OWI ZACwire signal from / to comm. board27 ADC analog output voltage to 10 Bit-ADC of comm. board

29 LINwire LINwire signal from / to comm. board35 RXD READ DATA channel of the MCB-Cs UART39 D2 MCB feedback answer41 D3 Power ON signal of the MCB (low active)43 D4 MCB address bit 045 D5 MCB address bit 147 D6 MCB address bit 249 D7 not used

Pin number (DUT terminals) Signal Remarksall even pin numbers GND connected with the negative MCB board supply

1 VDDA_DUT positive DUT supply (switched by a PMOS)3 SCL clock signal for communication (only I2C)5 SDA data signal for communication

7 n.c. internally not connected9 AOUT analog voltage output / ZACwire interface


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4. MASS CALIBRATION BOARD PCB

Mass Calibration Board: PCB top view and part description

UARTinterface

connector K2 fromprevious MCB or

communication board

Jumper K5:internal or externalI2C bus power supply

Jumper K6:analog output voltage

or GND to screwterminal KL4

Jumper K14:internal or externalDUT power supply

Jumper K11:mode of

communication

Jumper K4:MCB address

(3 Bit)

screw terminal KL2for external DUT

power supply

screw terminal KL1:main MCB

power supply

connector K3 tothe next MCB

GNDterminal

DUTterminal

screw terminalKL12/16:

no user access

StatusLEDs

C resetbutton S1

screw terminal KL4:analog output

voltage of DUT n

screw terminal KL3:external I 2C bus

power supply


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5. Communication Philosophy

The SSC Mass Calibration Board V2.0 contains a modern microcontroller with an internal 8 bit riscprocessor. The serial communication between this and the communication boards microcontroller isrealized via their common UART interfaces. Via the communication board all functions of the MCB canbe controlled. At the simplest case a terminal program (like Hyper Terminal) with the configuration

Baudrate: 19200

Databits: 8

Stopbits: 1

Parity: none

can communicate at the corresponding virtual COM port via defined commands with the hardware. Theevaluation software includes a small terminal program, adapted to the communication parameters ofthe Communication Board. The communication procedure of the different software modules are basedon this model. The possible commands can be classified into READ-, WRITE- and SPECIAL-commands. Every command sent to the hardware will be answered by a value or an error code. Forthe ICs typical data structure please refer to the corresponding Functional Description document.

5.1 Commands of the Mass Calibration Board

The known command set of the Communication Board is valid (refer CB_descr_rev1.02.pdf ). Thereis an additional command X. This command X doesnt affect the Communication Board directly, buta monitoring of the Mass Calibration Boards ACKNOWLEDGE signal is initialized. The CommunicationBoard forwards this ACKNOWLEDGE or an error code (in case of NO ACKNOWLEDGE) to the PC. Acommand can be extended by the Mass Calibration Boards pre-command part.

Syntax of this pre-command part:

Xa .........: The command starts with X and is finished with :a is the ID of the MCB to be addressed.

There are different types of syntax:

1. Standard Port Set/ Read commands are running on the MCB itself(The Communication Board forwards the MCBs ACKNOWLEDGE signal to the PC only !)example: X1PS _ A01:X ==> Port A0 of the MCB with a ddress 1 is Set to 1

2. Control of the logic sensor Channels ( 1 to 24 )(C symbolizes C hannel and _ is a wild card character)( C hannel 99 addresses all of the 24 sensor C hannels simultaneously)example: X4C _ 221:X ==> Channel 22 of the MCB with a ddress 4 is set to 1

(= power supply of this Channel is turned ON by a power transistor)

3. Activation of communication Channelsexample: X1CZ1:X ==> activates (= 1) Z ACwire communication via the MCB with a ddress 1

X9CA1:X ==> activates (= 1) Analog Channel of all connected MCBs ( a ddr. 9 = all)

X1CZ0:X ==> deactivates (= 0) Z ACwire communication via the MCB with a ddr. 1


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4. Simultaneous commands for Communication Board and MCBexample: X1C _ 241:OW_7800172 ==> activates (= 1) Channel 24 of the MCB with

a ddress 1 (power ON); 5 ms later (fixed) thecommand OW_7800172 is running by theCommunication Board (by this command theZACwire interface of the ZMD31050 is initializedand the IC is set into Command Mode)

5. Special commands for MCBX1V:X ==> read out of the firmwares Version string of the MCB with a ddress 1

5.2 Examples of VisualBasic 6 source code

I2C communicationerror = Direct_cmd("x1c_990:x") 'set signal ALL = 0 (= inactive)error = Direct_cmd("x1c_011:x") activate channel 1error = write_(1, &H78, 72, 0)error = write_(1, &H78, 2, 0) 'start cyclewait 0.03 settling timebuffer = read_(1, &H78, 2, 0) 'reed 2 Bytes from address 78error = Direct_cmd("x1c_010:x") deactivate channel 1

ZACwire communicationerror = Direct_cmd("x1cz1:x") 'activate ZACwire communicationerror = Direct_cmd("ps_a01") 'set port a0 to 1 (ZACwire line = high)error = Direct_cmd("x1c_011:ow_7800172") 'activate channel 1 and transmit command

ow_7800172 with a delay of 5 mserror = write_(2, &H78, 970134, 0) 'configures RAM to ZACwire for ever

functionality regarding sensor signal outputerror = write_(2, &H78, 2, 0) 'start cyclic measurementbuffer = read_(2, &H78, 2, 0) 'reed 2 Bytes from address 78error = Direct_cmd("x1c_010:x") deactivate channel 1

Analog Voltage Outputerror = Direct_cmd("x1ca1:x") 'activate analog channel

error = Direct_cmd("x1c_011:x") 'activate channel 1wait 0.05 settling time for analog valuebuffer = read_(5, 1, 10, 0) 'read analog valueerror = Direct_cmd("x1c_010:x") deactivate channel 1


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6. Application Hints

The MCB-hardware controls supplying of the connected DUTs, which are powered via Pin1 of the DUTconnectors (VDDA_DUT). Basically the DUTs can be supplied by the internally generated 5 VDCsupply voltage, if DUTs supply voltage is 5V.

Option for supplying the DUTs via the MCBs screw terminal KL2 has to be used, if DUTs supplyvoltage different from MCBs supply voltage. These potential is limited in maximum to 0.5V more thanMCBS supply voltage means 5.5V.

6.1 Higher DUT Supply Voltages than MCBs Supply VoltageBy the circuitry drawn below a DUT supply > 5,5 VDC becomes applicable with no restrictionsregarding the mass calibration functionalities of the MCS1. With this adaptation board the internalVDDA voltage of the DUT is limited to 5 VDC in maximum (refer SSCs voltage regulator adjustment, ifapplicable). Following adjustments have to be done at MCB: adjust jumper K14: intern close jumper K5

DUT connection circuitry for high voltage DUT supplying

1DUT

withsupply voltage V+

greater thanVDDA_DUT

V+SCLSDA

VOUTGND

DUTconnector

MCBV < 40 VDC

UZ = 3,6V

BC847pn3k3

4k7

27k

27k

470k

1n

100n

+

- VDDA _DUT

OutputDivider Option (no OWI)


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A voltage divider and buffer for DUTs output voltage (VOUT) has to be used for using MCBs analogoutput voltage multiplexing function, if the maximum output voltage of the DUT is greater than 5V (f.i. 0-10V output). So the output signal is divided in range smaller than 5V.

Notice, that in these case the communication potentials are pulled (open drain!) using the VDDA_DUTsupply potential.

6.2 Lower DUT Supply Voltages than MCBs Supply VoltageMCS supports also lower DUT supply voltages than MCBs supply voltage and communicationhardware (CB). CB & MCB are supplied with 5V. Following adjustments have to be done at MCB: adjust jumper K14: extern open jumper K5 supply the DUTs with required supply voltage via connector VDD_DUT (KL2) connect the communication line supply to the same potential/supply voltage via the connector

I2C_Power (KL3)

6.3 4-20mA Current Loop ApplicationMCB hardware supports also current loop application. The decisive difference of current loop and allother applications is measurement of loop current. So normal parallel connection of all DUTs to onesupply source is not applicable, because the coupling between the DUTs would adulterate the loopcurrent measurement in calibration of the loop.

Calibration of current loop application DUTs requires an independent and potential free supplysource for every DUT!

Following adjustments have to be done at MCB: adjust jumper K14: intern close jumper K5


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DUT connection circuitry for current loop application (in construction)

6.4 DUTs Output Voltage measurement using MCBMCB contains a multiplexer for connecting the output potential VOUT of the selected DUT to aconnection terminal and CBs onboard ADC (the 10bit ADC of the ATMEGA32).

In general has to be noticed, that DUTs output potential to be measured (VOUT) is never higher thanMCBs supply voltage (5V).

Following desribed commands allow measurement of the output voltage. The command contain alwaysan identifier for the selected MCB (MCB-adddress) and the DUT to be accessed:

- $: MCB address = 0...7 or 9 for a broadcast command- ##: DUT number (2 chars) = 01...24 or 99 for a broadcast command

Cmd# command DescriptionExample condition:all DUTs are calibrated and programmed 100%ly, no communication

refer ZMD31xxxKIT_CommandSyntax_Rev_*.xls for an example with

1DUT

with4-20mA

current loop

V+SCLSDA

GND

DUTconnector

MCBV < 40 VDC

UZ = 3,6V

BC847pn3k3

4k7

27k

27k

470k

1n

100n

+

- VDDA _DUT

Loop CurrentMeasurement Amp Option


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special, incidental, or consequential damages of any kind in connection with or arising out of the furnishing, performance, or use of thistechnical data. No obligation or liability to any licensee or third party shall result from ZMDs rendering of technical or other services.

For furtherinformation:

ZMD AGGrenzstrasse 2801109 Dresden, GermanyPhone +49 (0)351-8822-366Fax +49 (0)[email protected]

ZMD America, Inc. 201 Old Country Road, Suite 204Melville, NY 11747, USA Phone +01 (631) 549-2666Fax +01 (631) [email protected]

ZMD America, Inc. 15373 Innovation Drive, Suite 110San Diego, CA 92128, USA Phone +01 (858) 674-8070Fax +01 (858) 674-8071 [email protected]

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