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I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 1 of 15ph +64 21 623-402 www.i2cchip.com sales@i2cchip.com
Features•Uses BL233 I2C-Serial IC•Both RS232 & USB interfaces•Three separate I2C busses•2x SPI bus•2x Dallas type 1-Wire bus•Easy ASCII commands•High-Speed•On-board power supply•Galvanic Isolation•82B715 High current Bus buffer•Power-On, Watchdog and other
autonomous actions withoutworking PC
•Auto-switching USB/RS232•Cross-Platform: Linux, Windows,
PDA's etc•USB Bus Powered•45x80mm
Applications•Evaluation Boards for I2C & SPI
chips•Rapid Prototyping & PnP design•PC based instrumentation and control•ATE for I2C/SPI based equipment•Reader for 1Wire serial numbers•Isolated I/O
•Cheap and Easy Data logging•PC and Network Watchdogs•PDA/Calculator Analog/Digital I/O•Galvanically Isolated PC interface•Education•RS232 parrallel I/O•Evaluation of I2C and SPI chips
ProgrammableEEProm stores commands and settings•Power On Reset actions•Interrupt actions•Watchdog timeout actions•Macro's •Autonomous actions
DescriptionWith both USB and DB9 serialinterfaces this is a truly universal I2Cinterface, that opens your product up tothe widest possible range of computinghardware, with the simplest and mostportable software format.Building an I2C based instrumentneeds nothing more than your I2Cchip, everything else is included. Thereis an internal 5V power supply to runthe interface and your target hardware.Simple systems will run from the USB
USB
RS232
FibreOpticRS422
OptoBL232
5V PSU
82B715
I2C
TTL SerialPort
I2C
I2C
I2C
10x Buffer
4 I2C Ports
Gal
vani
c Is
olat
ionDual Interface I2C Adaptor
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 2 of 15ph +64 21 623-402 www.i2cchip.com sales@i2cchip.com
bus power.
Unlike some competing products, itcan sustain high baud rates, and hasmultiple I2C BussesCompared to cruder solutions, itdoesn't rely on bit-bashing PCsoftware, ill defined I/O characterisics,or processor and OS dependent timing.
Power-On-Reset actions can be set inEEProm so that systems are properlyinitialised when the PC is not present.
Watchdog actions can be programmedto automatically respond to PC failure.
Galvanic isolation can be installedwhere the I2C busses need to beisolated from the computer.
An optional Fibre Optic interface isavailable where very high voltage ortotally secure isolation is required. An RS422 interface is available forlong distance or high noise immunity.Ferrite beads are fitted to all data linesfor EMC protection.
Table Of ContentsFEATURES.............................................................................................................................................1
APPLICATIONS....................................................................................................................................1
PROGRAMMABLE ..............................................................................................................................1
DESCRIPTION ......................................................................................................................................1
1 COMMANDS.......................................................................................................................................3
2 SOFTWARE INTERFACE................................................................................................................3
3 INSTALLING AND TESTING YOUR NEW ADAPTOR..............................................................4
4 RS232-USB SELECTION...................................................................................................................4
4.1 AUX INTERFACE .............................................................................................................................54.2 BLUETOOTH....................................................................................................................................5
5 I2C BUS CONNECTOR.....................................................................................................................5
6 CS AND INTERRUPT PINS..............................................................................................................6
7 BUS DRIVE .........................................................................................................................................7
8 POWER SUPPLY ...............................................................................................................................7
8.1 USB BUS POWERED .......................................................................................................................78.2 POWER TO I2C DEVICES.................................................................................................................78.3 LOCAL AND USB POWER .............................................................................................................7
9 OPTIONS.............................................................................................................................................8
9.1 GALVANIC ISOLATION....................................................................................................................8
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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9.1.1 Power .....................................................................................................................................89.1.2 External 5V to PC Side ..........................................................................................................89.1.3 Fitting a DC-DC Convertor...................................................................................................89.1.4 Bypassing the isolation ..........................................................................................................89.1.5 Fitting Isolator Yourself.........................................................................................................99.1.6 USB Power only Cable ..........................................................................................................9
9.2 82B715 BUS EXTENDER.................................................................................................................99.3 USB LEDS AND POWER LED ..........................................................................................................99.4 USB EEPROM ................................................................................................................................9
10 EXAMPLE APPLICATIONS..........................................................................................................9
10.1 8 BIT I/O PORT.............................................................................................................................910.2 SIMPLE DATA LOGGER WITH NO PC SOFTWARE.........................................................................1010.3 SIMPLE RS232 I/O PORT............................................................................................................1010.4 RS232 TO LCD MODULE ADAPTOR ...........................................................................................1010.5 HUGE RS232 PARALLEL PORT ...................................................................................................1010.6 READING A DS2401 1 WIRE SERIAL NUMBER ............................................................................11
11 USB ...................................................................................................................................................11
12 FAQ ..................................................................................................................................................11
13 FACTORY TEST PROCEDURE..................................................................................................13
13.1 VISUAL INSPECTION ...................................................................................................................1313.2 DC SUPPLY CURRENT AND POWER SUPPLY ................................................................................1313.3 RS232 ........................................................................................................................................1313.4 USB ...........................................................................................................................................1313.5 I2C BUS 1...................................................................................................................................1313.6 I2C BUS 2...................................................................................................................................1413.7 INT PIN......................................................................................................................................14
14 SCHEMATICS AND DRAWINGS ...............................................................................................15
14.1 PCB OVERLAY...........................................................................................................................1514.2 SCHEMATICS...............................................................................................................................15
15 ORDERING INFORMATION ......................................................................................................14
16 OEM VERSIONS ............................................................................................................................14
16.1 RS232/USB TO TTL INTERFACE ...............................................................................................14
17 CO-OPERATION............................................................................................................................14
1 Command sRead the BL233 PDF Datasheet for a full description of commands and operation.
2 Software InterfaceThe I2C-2-PC appears as a serial port device when either the USB or RS232 are used.(Linux and Windows).
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 4 of 15
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No special API's or DLL's are required to access it. Almost any programminglanguage can be used including Labview. Our customers are using it with• VB• C, C++• Labview• Matlab• Delphi• Java• Python• Perl• PDA's • Batch files
3 Installing and Testing Your New AdaptorThe I2C2PC is normally shipped set to 57,600 bd N81, RTS/CTS handshake. If you have Galvanic Isolation fitted, read section 9.1
•Download, Install and Start Realterm (realterm.sourceforge.net)•Change port settings to hardware handshake RTS/CTS. Set to HALFDUPLEX so
you can see what you type. Alternatively you can make a shortcut with theseparameters e.g.“realterm.exe baud=57600 flow=2 half”
•Ensure the Port Select jumper is in AUTO position (ie not fitted). The port willdefault to RS232 when the USB is not connected.
•Connect a DB9 serial extender (m-f) cable (not a cross over cable) to the RS232.•Apply 9V Centre positive 2.1mm power supply.•When you apply power you should see a default startup message like “HI I2C v103”.
Note you probably won't see this when using USB power, as the message isnormally sent before the bus has enumerated.
•Type “?”. The I2C2PC should reply with 2 hex bytes of the status byte eg “18”•Install the Port Select Jumper in the AUTO position (towards the USB connector).
Repeat the tests above (with RS232)•If you are going to use the USB, install the FTDI driver software for Windows.
http://www.ftdichip.com/FTWinDriver.htm
4 RS232-US B SelectionSelector 1at edge of board under USB/DB9 connectors: 1 Boards before May 2003 are:Jumper toward DB9: Always USB
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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•Jumper toward DB9: Always RS232•Jumper toward USB connector: Always USB •No Jumper: Autoselect USB when bus enumerates, RS232 otherwise.
Duplicate jumper holes are in the board above the 4052(J2), and can be fitted whenyou don't want to use the ones at the edge.
4.1 Aux InterfaceYou can add a 3rd interface, eg Fibre or RS422. This plugs into CN9, and is selectedby fitting J1, and the "USB Always" jumper.
4.2 BluetoothA Bluetooth serial module could be connected to the Aux interface. This would beideal for interfaceing with PDA's.
5 I2C Bus C onnectorThe I2C Bus connector used is a MICRO-MATCH by AMP. Either 4 or 6 way can beused. Connectors are available from Farnell.# 4 Way 6 Way1 SDA SDA2 VDD VDD3 VSS VSS4 SCL SCL5 INT / CS Interrupt input (active low) or
Chip select for SPI (jumper select)6 VAUX Aux supply. Not connected
The reason for the power lines being between the I2C wires is to stop the edges ofSDA and SCL coupling together. This follows the Philips pattern set out in section17.3 of The I2C Bus Specification.
If the length of the bus lines exceeds 10 cmThis arrangement will have similar capactive loading on SDA and SCL. Where youdon't use pins 5 & 6, it can be better to just use 4 wires.
Jumper toward USB connector: Autoselect USB when enumerated, RS232 otherwise.No Jumper: Always RS232
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 6 of 1
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AMPwww.amp.com
Farnell
www.farnell.com
RS
6 way male-on-wire
7-215083-6 149-068
6 pin female-onboard
7-215079-6 148-519
4 pin male-on-wire
7-215083-4 149-032
4 pin female-on-board
7-215079-4 148-507
Made up cable assemblies are available from Farnell.
Figure 1
6 CS and In terrupt PinsJumpers are provided to select the function of pin 5IRQ (input), and CS/1Wire (i/o). This is for BUS#connected to IRQ.
Bus #2
Bus #3
Bus #1
9V DC
5 sales@i2cchip.com
of the I2C connector between 2, 3 only. Bus#1 is always
CS IRQ
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 7 of 15
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7 Bus DriveThe bus is fitted with 1k5 pullup resistors in SIL resistor packs. The BL233 can drivemuch higher currents if required, 15-20mA @5V VCC. There is a 47 ohm protectionresistor in series with the outputs that will need to be reduced of course. You will need a buffer at the other end of the bus. If you want to reduce the current, replace the resistor pack. We recommend cutting itout with fine side cutters, removing the individual pins through the top of the board,and desoldering the holes.
8 Power Su pplyExternal power is 9-12V DC, (2.1mm centre positive). An on board power supplyregulator is fitted using a 7805.
•USB Bus Powered USB Data: ~50mA for I2C devices•USB Bus Powered RS232 Data: ~50mA for I2C devices•External Power, RS232•External Power USB
8.1 USB Bus PoweredThe USB bus can deliver up to 500mA. Devices that draw > 100mA from the busshould have switched load.
8.2 Power to I2C DevicesThe I2C Bus VDD is connected to the interfaces VDD (5V). To isolate an I2C Bus VDD from the I2C Adaptor's VDD, remove the associated0603 ferrite bead by the connector. (FB9-12)
8.3 Local AND USB PowerBoards manufactured after April 2003 should work happily with both external andUSB power.If you do not want the USB bus to try and power your equipment, remove D5 (byUSB connector). Normally you would do this when building the I2C-2-PC into astandalone equipment that has its own 5V supply.
With boards manufactured before May 2003:There are some traps to watch when using a local power source, and the USB adaptor.The USB chip will not see a power on reset when the USB Bus is connected, andlocal power is already applied, and may not enumerate correctly. See FTDIdocumentation for more reset details.
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
© 2002 Broadcast Equipment Ltd PRELIMINARY I2C2PC.doc r27 page 8 of 15
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9 OptionsThese options are not fitted as standard, as few users require them.•IL716 Galvanic Isolation•82B715•USB Leds•Power LED•USB EEProm•3rd I2C bus connector•Aux serial interface connector and jumper
9.1 Galvanic IsolationThe NVE IL716-3 magnetic isolator is used for galvanic isolation. For moreinformation see the NVE datasheet.
9.1.1 PowerWhen isolation is fitted, you have to power the PC side separately from the I2C side.Normally USB power is used for the PC side, and an external 9V supply for the I2Cside. If you want to use the RS232 interface, you can still use the USB connector to providepower. Just fit the "RS232" jumper to force the interface to use RS232. (with nojumper the interface autoselects USB when the USB is connected to a computer, butnot when a USB power-only cable is used)
9.1.2 External 5V to PC SideIf you are not using USB power, fit 2 pin connector CN4 and protection zener D1(BZX85C5V6 or BZX85C6V2).The PC side requires 5V, 30mA.
9.1.3 Fitting a DC-DC ConvertorIf you want to power one side of the isolation barrier from the other, you can fit a 5V-5V DC-DC convertor module. The easiest point to access VCC and GND is pins 1and 6 of CN2 and CN9. You can power either side from from the other. Suitable convertors are available fromFarnell, RS, Digikey etc.
9.1.4 Bypassing t he isolationIf you don't need the isolation you can simply join VCC and GND ie CN2-1 to CN9-1and CN2-6 to CN9-6.Beware of forgetting that the isolation is gone!
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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9.1.5 Fitting Isolator YourselfIf you need isolation, either mill, or chisel the bridging tracks from the IL716footprint and fit the IC.If you use RS232, and an isolator you will need to power the RS232 section. Fit CN4,and protection diode D1 (BZX85C5V6 or C6V2)
9.1.6 USB Power only CableYou can use a USB Power-only cable to power the PC side, when using RS232. Thisis just a USB cable with only the 2 power wires fitted.
9.2 82B715 Bus Extender(See Bus Drive above. If you only need more current, you probably don't need the82715 at the I2C-2-PC end)The Philips 82B715 increases the drive of Bus 1 by 10x where long bus lengths mustbe driven. At the other end of the extended bus you have another 82B715 on a BusExtender Board
9.3 USB Leds and Power LedUSB-RX (led1) and USB-TX (led2) leds can be fitted if you want. Use 5V built-inresistor type leds (or use 3mm leds + 330 ohm resistors). These LEDs flash brieflywhen data is sent or received through the USB bus. They are useful for debuggingpurposes. Led3 is a power LED.
9.4 USB EEPro mUSB info can be set in the 93C46B EEProm. FTDI utilities allow you to set this. Thiswill let you enumerate the device as something other than a generic usb/serial adaptor,as well as setting special information such as current concumption.
10 Example ApplicationsSee the http://www.i2cchip.com for more examples.
10.1 8 Bit I/O Po rtUse a Philips PCF8574 or Onsemi JLC1562. Seehttp://www.i2cchip.com/pcf8574.html for i/o boards and keyboards. You can drivesmall relays like NAIS TQ-2 directly.
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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Figure 2
10.2 Simple Dat a logger with no PC SoftwareUse a Philips PCF8591 4 channel 8 bit A-D chip. Store this macro in the EEProm at location 0. It will run automatically at power on,sending 4 channels of A-D data in hex, followed by LFS90 04 R04 T0A L0200 >00[Start][address 0x90 (8591)][Control register=0x04][Read 4 channels of A-D] [TypeLF (linefeed)][delay 512 ms][goto start]Capture the data to file with Realterm.Plot it with Excel, Matlab etc.
10.3 Simple RS232 I/O PortThe I2C-2-PC can be used directly as an 8 bit I/O port with a 1 bit IRQ input. No I2Cor SPI chips are needed at all. This is ideal for connecting relays, lights and switchesto a PC.O OF[write 0x0F direct to pins]Q[read pins]?[read IRQ input]
10.4 RS232 to L CD Module adaptorA single PCF8574 can drive a standard LCD module. This circuit is available builtup.
10.5 Huge RS232 Parallel PortTo get are large number of cheap and easy output pins with good drive capability, usethe SPI output, and 74HC4094 shift registers. Eg a 32 bit output with 4x 4094's.SDA4 is used as STB for the 4094'sG3 Y01020408 OFFFD OFFFC
[select bus3][send 4 bytes to 4094's][pulse STB pin to latch data] nb O not zero
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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10.6 Reading a DS2401 1 Wire serial numberTo read a DS2401 serial numberGC S ? W33 R04[Select 1 wire bus#1 (bus #C)][Start(reset)][Get status to check presence][ReadRomCommand][Read 4 bytes of rom data]Since Start can be followed immediately by write data, a shorter version is:GC S 33 R04[Select 1 wire bus#1 ][Start][ReadRom command][read 4 bytes]
11 USBUSB requires the Virtual Comport drivers for Windows. For other operating systemssee http://www.ftdichip.com/FTDriver.htm
USB introduces latency that may affect your software design. Seehttp://www.ftdichip.com/knowledgebase/AppNotes/005/knowledgebase.htm
This latency affects all USB devices. To avoid it you should structure your softwareto decouple the commands you send from the data coming back. ie you send as manycommands as possible to the BL233, then you process the data as it returns. If yousend a command, then wait for each response, performance can be very poor.
Just because USB runs at 12Mbps does not mean it really works fast. RS232 mayperform better in practice. This is why we provide both interfaces.
The USB configuration in EEProm can be changed so that it enumerates as a specialdevice rather than a virtual comm port. FTDI utilities can be provided to do thisFTDI provides D2XX DLL Drivers are to directly access the USB interface.http://www.ftdichip.com/FTD2XXDriver.htm We recommend using the Virtual Comm Port approach, as you retain the flexibility touse RS232 with no software changes.
12 FAQ
The BL233 datasheet is the place to find answers to your software questions!
Can I use 3V IC's?Yes. Bus# 3 has TTL Levels. Use 2 shottky diodes to clamp SDA &SCL to the 3VVCC.An alternative is a level shifter. Contact sales@i2cchip.com for availability.
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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Can you supply a 3V version?Yes we can for OEM orders.
My adaptor doesn't work. I have Galvanic Isolation. You have to power the PC side and the I2C side separately. See 9.1.1
USB is really slow?Latency is an issue. See USB section 11
The data is gobbledygook.First use Realterm to test the adaptor. Make sure the baud rate is correct (57600 isdefault) and that you are using RTS/CTS handshaking.
Realterm doesn't do XXXXYou can try the latest development version of Realterm athttp://www.i2cchip.com/realterm
Does it work with Labview?Yes. Labview has good serial support
How do I interface to a PDA?• Most PDA's have TTL level serial connections available. The BL233 will directly
interface to this through the AUX header on the pcb.• RS232 adaptor cables are available for some PDA's. You will probably need a
null modem plug/cable to connect them together• You can use an IRDA receiver connected to the AUX header. The IR port is a
comm port to the PDA software• Use a bluetooth module connected to the AUX header. These give up to 100m
range.• RS232 Compact Flash card. If your PDA has a CF slot you can get an RS232 card
for it.
My PDA has a USB cable. How do I use it?Except for the latest devices, most PDA's are a USB slaves, and cannot control otherUSB slaves. (ie you can't) If your PDA can plug direct into a USB printer then it might be possible.
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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13 Factory Test ProcedureThis is the factory test procedure:
13.1 Visual Insp ection
13.2 DC Supply current and Power supplySet PSU to 0V.Connect to DC socket.Increase supply voltage slowly to 8V, whilst measuring the 5V line across D2, andwatching for excessive current (>50mA)Check supply voltage on CD4052 is between 4.75 and 5.25V
13.3 RS232Install RS232 jumperConnect RS232 cable and set terminal program to nominal baud rate (normally57600)Connect power to adaptorTerminal should display "HI I2CAD V1.04" or similar. Note that once the EEPromhas been changed this may no longer be true.Type "?". Board will reply with 2 chars eg 18
Remove jumper (auto-select).Type "?" again and check still works
13.4 USB(Note that FTDI USB/serial adaptor drivers may need to be installed first time)Remove RS232. Plug in USB.Type "?" and check response.In case of problems check the USB RX and USB TX LED positions with anoscilloscope. These pulse low when chars are received or sent. Note that you won'tsee the "HI I2CAD V1.04" power on message through the USB port as the USBconnection is not enumerated yet, when the BL232 starts.
13.5 I2C Bus 1Connect the test PCF8574 board to I2C Bus1.Type "S42F0P"Half the leds will come on
I2C to PCUSB & RS232 TO I2C/SPI ADAPTOR & CONTROLLER
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13.6 I2C Bus 2Connect the test PCF8574 board to I2C Bus1.Type "G2" to change to I2C Bus 2Type "S42F0P"Half the leds will come on
13.7 INT PinPut jumpers J4,5 in INT positionSend ?. Reply is "18"Hold down a button on 8574 board.Send ?. Reply is "08"Check for 3 busses
14 Ordering Information
14.1 OEM Versio nsIt is available as a bare board in OEM packs. Bare boards can be supplied with aslightly different DB-9 if required for mounting the board on stand-offs.Special builds are also available for volume orders.• RS232 only• USB only• Bluetooth
14.2 RS232/USB to TTL InterfaceWe supply this board for use as a built up serial interface to customers TTL leveldevices. Contact us for pricing.CN2 connects to your device and can power it.Pin# Direction Function1 V+2 From PC TTL RTS3 From PC TTL TXD4 To PC TTL RXD5 To PC TTL CTS6 0V
15 Co-opera tionWe offer all customers a link page on our web site, where others can find out aboutyour products. We encourage you to use this.
1 2 3 4
A
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C
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4321
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A Title
Number RevisionSize
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Date: 5-Jun-2003 Sheet of File: C:\cad\a\I2CAd\I2CAd.ddb Drawn By:
TTL_RTS
TTL_CTSTTL_RXD
TTL_TXD
VCC
GND
I2CSerialAdI2CSerialAd.Sch
123
CN5
Socket2.1mm
C17
47uF 10V
12
CN4
D2
C6V8
Power or VCC 5V Led Vin 1
GN
D2
Vout3
U87805 C18
47uF 16V
D3
1N4001
C19100n
led3
5Vorg3mm
D4
1N4001
USB_TXD
USB_RXDUSB_CTS
USB_RTS
GND
_PWREN
VCC
FT8U232BFT8U232B.Sch
TTL_RTSTTL_TXD
TTL_RXDTTL_CTS
GND2
VCC2
USB_TXDUSB_RTS
ALL_RXDALL_CTS
OPTO_RTSOPTO_TXD
VCC1
GND1
_USBEN
RS232Ad_BRS232Ad_B.sch
FID?
FIDUCIAL
FID?
FIDUCIAL
MP?
OTHER BARE BOARD
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GND1
23456789
R31k5
C8100nF
C10 15pF
C915pF
X114.7456
VDD 14
OSCIN 16
OSCOUT 15RST4
SCL4/CS23
VSS5
SDA22
SCL21 SDA1 18
SCL1 17
SDA3 13
SCL3 12
SDA4/CS3 11
RTS 10CTS9
TXD8
RXD7
INT6
U4BL233-DIP
VCC
GND
TTL_RTS
TTL_TXD
TTL_RXD
TTL_CTS
VCC
GND
VCC
VCC
GND
R17 47
R18
47
R19 47
R20 47
R16 47
R15 47
SDA1
VDD2
VSS3
SCL4
INT5
VAUX6
CN8I2C6PIN
SDA1
VDD2
VSS3
SCL4
INT5
VAUX6
CN7I2C6PIN
SDA1
VDD2
VSS3
SCL4
INT5
VAUX6
CN6I2C6PIN
GND
C23
100n
C22
100n
C21
100n
FB11
FB10
FB9
GND
GND
R23
47
R24
47
R25
47
GND
GND
NC 1
LX 2
LY 3
GND 4NC5
SY6
SX7
VCC8U7
82B715
SDA1
VDD2
VSS3
SCL4
INT5
VAUX6
CN10I2C6PIN
VCC
VCC C24
100n
C20
100n FB12
GND
R26
47
GND
R28470
R27470
I2C Bus 1 Buffered
I2C Bus1
I2C Bus 2
I2C Bus 3
1 2 3
J5CON3
1 2 3
J4CON3
Q1B
DMMT3906W n/f
Q1A
DUAL-PNP
R71k5
GND
VCC
Q2B
DMMT3906W n/f
Q2A
DUAL-PNP
R81k5
GND
VCC
Q3B
DMMT3906W n/f
Q3A
DUAL-PNP
R291k5
GND
VCC
Q4B
DMMT3906W n/f
Q4A
DUAL-PNP
R301k5
GND
VCC
R31
1k5
VCC
Bus 1&2 can have either Constant-Current or Resistive pullups. From the factory, resistive pullups are standard.
EITHER:Use 9 pin R5 resistive pull-ups (default)ORFit constant current generators (Q1-4+resistors) and 5 pin R3. 5 pin SIL is fitted with pin 1 in the pin 1 position
R32
1k5VCC
1 2 3 4
A
B
C
D
4321
D
C
B
A Title
Number RevisionSize
A4
Date: 5-Jun-2003 Sheet of File: C:\cad\a\I2CAd\I2CAd.ddb Drawn By:
GND1
C5100nF
GND1
GND1
GND1
GND1
C3100nF
C1 100nF
C2 100nF
C4 100nF
DCD 1
DSR 6
RXD 2
RTS 7
TXD 3
CTS 8
DTR 4
RI 9
GND 5
CN1DB9F
C1+1
V+2
C1-3
C2+4
C2-5
V-6
T2OUT7
R2IN8 R2OUT 9
T2IN 10
T1IN 11
R1OUT 12
R1IN 13
T1OUT 14
GND 15
VCC 16
U1ST202ECD
VDD11
GND12
IN13
IN24
OUT35
OUT46
GND18
VDD2 16
GND2 15
OUT1 14
OUT2 13
IN3 12
IN4 11
GND2 9
U3IL716
X0 12
X1 14
X2 15
X3 11
Y01
Y15
Y22
Y34
INH6
A 10
B 9VEE7
X 13
Y3
VCC 16
GND8
U274hc4052
GND1
C6
100nFGND1
C7100nF
R1
10kR2
10k
12
J1
VCC1
GND1
FB1FB2
FB3
VCC2VCC1
Refers to PC labels
123456
CN2
MM6F
GND2
VCC2
4052 Mux Posn's0: Opto1: Invalid (not used)2 :USB3: RS232
TTL_RTSTTL_TXDTTL_RXDTTL_CTS
GND2
VCC2
USB_TXDUSB_RTS
ALL_RXDALL_CTS
OPTO_RTS
OPTO_TXD
RS232
VCC1
GND1
C1647uF
VCC1
VCC1
FB4
IL716 normally NOT FITTEDand tracks bridge packageCut tacks and fit to isolate
GND1
123
J2
_USBEN
VCC1
USB
n/f: Auto
D1C6V8
123456
CN9
MM6FGND1
VCC1
Opto Select
GND2
External Fibre /RS422 Adaptor
External TTL Serial Device
123
J3
GND1
R5
10k
1 2 3 4
A
B
C
D
4321
D
C
B
A Title
Number RevisionSize
A4
Date: 5-Jun-2003 Sheet of File: C:\cad\a\I2CAd\I2CAd.ddb Drawn By:
GND1
GND1
GND1
R10 27
R9 27
R111k5
FB8
GND1
C14
100n
C1533nF
GND1
GND1
GND1GND1
C11
100n
Vbus 1
D- 2
D+ 3
GND 4
Chasi 5
CN3
USB CONECTOR
EESK1
EEDATA2
VCC3
RST4
RSTOUT5
3v3OUT6
USBDP7
USBDM8
GN
D9
SLEE
P10
RXLE
D11
TXLE
D12
VCC
IO13
PWRC
TL14
PWRE
N15
TXD
EN16
GND 17RI 18DCD 19DSR 20DTR 21CTS 22RTS 23RXD 24TXD
25V
CC26
XTI
N27
XTO
UT
28A
GN
D29
AV
CC30
TEST
31EE
CS32
U6
FT8U232B
CS 1CLK 2
D 3
Q4
GN
D5
ORG6
DNC7 VCC
8
U5M93C46BN1(8)
R1310k
R12
2k2
GND1
R6
100k
R4
10k
VCCUSB
GND1
X26MHz
USB_TXD
USB_RXD
USB_CTSUSB_RTS
GND
_PWREN
VCC
VCCUSB
R22 n/f
R21 10k
GND1
VCCUSB
PWRCTL tied low for Bus PoweredHi for self powered
led2
5Vorg3mmled1
5Vorg3mm
VCCUSB
C30 27pF C31 27pF
GND1 GND1
VBUS
PWREN is Active Low.Prevously USBEN was active hi,un FT8U232A
Q5BC847
D51N5711
R14470
C12
100n
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