ADUC812 EVALUATION BOARD REFERENCE GUIDE

ADuC812 Evaluation Board Reference GuideEvaluation Board OverviewCONTENTS:Evaluation Board Reference Guide:1) Evaluation Board Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 32) Evaluation Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 43) Link options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64) External Junctions (Connectors) . . . . . . . . . . . . . . . . . . . . . . . 95) LDR Demonstration Circuit . . . . . . . . . . . . . . . 116) Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12(1) EVALUATION BOARD OVERVIEWThe ADuC816 Evaluation board has the following features :• 2 Layer PCB (4” X 5” Form Factor)• 9V power supply/battery regulated to 5V on board (see section 2)• 4 Pin Header Interface to RS232 dongle cable• Access to all ADC inputs from external header. DAC output channel buffered to external header.(see section 2 and section 4)• All device Ports and Strobes are brought out to external header pins (see section 4)• General Purpose Prototype Area (see section 2)• 32KBytes External memory (SRAM) (configurable as data or volatile program memory) (seesection 2 and section 3)• External Program Memory Socket for NV program memory (see section 2)• 11.0592MHz Crystal (see section 2)• Reset/External Interrupt 0 Push Buttons (see section 2)

• Power Indicator/General Purpose LEDs (see section 2)• Example LDR Demonstration Circuit (see section 5)ADuC812 Evaluation Board Reference GuideEvaluation Board OverviewNOTES :1. All references in this document to physical orientation of components on the board are made with respect to a componentside view of the board with the battery connections appearing in the top right corner of the board.2. The board is laid out to minimize coupling between the analog and digital sections of the board. To this end, the groundplane is split with the analog section on the right hand side and a digital plane on the left hand side of the board. Theregulated 5V power supply is routed directly to the digital section and is filtered before being routed into the analog sectionof the board.3. The ADuC812 can be socketed on the board using a QFP carrier adaptor and corresponding surface mount feet availablefrom Ironwood Electronics The part numbers are CA-QFE52SB-L-Z-T-01 and SF-QFE52SB-L-01 respectively.WEB: www.ironwoodelectronics.comEmail: info@ironwoodelectronics.com

ADuC812 Evaluation Board Reference GuideEvaluation Board FeaturesA RESET push button is provided to allow the user to manually reset the part. This button is at the inputto the ADM809 (Power on Reset chip) so a delay of 240ms approx will be required for the part to beactually released from reset after the button is released.An ,17 push button switch is provided to allow the user perform external interrupts easily. The ,17signal is Schmitt triggered (U5) to prevent noise on the rising edge of ,17 to cause multiple interruptsas it passes the trip point. This Schmitt trigger also inverts the signal.Power Indicator/General Purpose LEDs:A green power LED (D2) is used to indicate that a sufficient supply is available on the board. A redgeneral purpose LED (D1) is connected to P3.4 of the ADuC812. An inverter is connected between theLED and the port pin so that the SETB instruction turns the LED on and the CLR instruction turns theLED off.

ADuC812 Evaluation Board Reference GuideUse :Slide LK5 into the ON position to connect the 66 pin to the external SPI/I2C connector.Slide LK3 into the OFF position for normal device operation of analog input ADC5.LK6 (2x1) Connect T2to Time/Strobe ConnectorFunction: Allows the T2 pin to be connected to the Timer/Strobe connectorUse :Slide LK6 into the ON position to connect the T2 pin to the external Timer/Strobe connector.Slide LK6 into the OFF position for normal device operation of analog input ADC0.LK7 (2x1) Connect T2EXto Time/Strobe ConnectorFunction: Allows the T2EX pin to be connected to the Timer/Strobe connectorUse :Slide LK7 into the ON position to connect the T2EX pin to the external Timer/Strobeconnector.Slide LK7 into the OFF position for normal device operation of analog input ADC1.LK8 (2x1) Connect Waveform Generator CircuitFunction: This 3-way link is used to route a specific waveform (sine, square, triangular) onto ADCchannel 0 as detailed below.The frequency of the generated waveform is 723Hz in each case.Use:Insert Link in Position A to conntect triangular wave to ADC0Insert Link in Position B to conntect square wave to ADC0Insert Link in Position C to conntect sine wave to ADC0LK9,10 (2x1) I2C Pullup Resistor ConnectionsFunction: This connects the 1KΩ pullup resistors that are required for I2C operation.Use :Slide LK9,10 into the ON position to connect the I2C pullup resistors.Slide LK9,10 into the OFF position for normal device operation.LK11 (2x1) ($ PulldownFunction: Allows the user to force the ADuC812 to execute the first 8kBytes of program memory fromthe internal or external program memory space.Use :Insert LK11 to pull ($ low causing the ADuC812 to run code from external programmemory.Remove LK11 to leave ($ high so as to run code from the internal Flash/EE programmemory.

ADuC812 Evaluation Board Reference GuideNote: This link can also be used with the Accutron ACE emulator. The single pin emulatorsimply connects to this link.LK12 (3x1) External Data MemoryFunction: This link is used to configure the external data memory map. Either the bottom 32k Bytes ofthe external data memory space is mapped or the bottom 256 bytes in the first 128 pages ismapped. (via A16-A23 and U4).Use :Slide LK12 to Position A to make U14 transparent. Hence the external data memory (U7) seesaddress lines A0-A14. Hence the bottom 32K Bytes of the address range are mapped into theexternal data memory space.Note: In this mode (using less than 64k Bytes of XRAM) the latch U14 is unnecessary.Slide LK9 to Position B to allow ALE to latch U14. Hence the external data memory (U7)sees the address lines A0-A7 and A16-A22. Hence the bottom 256 Bytes in the first 128 pagesof the address range are mapped into the external data memory space.Note: This mode may not be of particular use to the user but it does show the 24 bitaddressing ability of the MicroConverter.

ADuC812 Evaluation Board Reference Guide(4) EXTERNAL JUNCTIONS(CONNECTORS):J1 Analog I/O ConnectorThe analog I/O connector J1 carries all ADC inputs and DAC output channels as well as the external V REFinput. The pinout and orientation of this connector is shown below.246810 12 14 161820221357 9111315 171921Figure 2: The Analog I/O connector J2Pin Function Pin Function1 ADC0 12 AGND2 AGND 13 ADC63 ADC1 14 AGND4 AGND 15 ADC75 ADC2 16 AGND6 IN(+) OP-AMP (spare) 17 DAC07 ADC3 18 Out OP-AMP8 IN(-) OP-AMP (spare) 19 DAC19 ADC4 20 AGND10 DAC ADJUST 21 VREF11 ADC5 22 AGNDJ2 Serial Interface ConnectorTable 1: Pin functions for Analog I/O connector J2J2 provides a simple connection of the evaluation board to the PC via a dongle cable (provided with theADuC812 QuickStart Development System).J3/J6/J7 (Port0 / Port2 / Port 3)3 parallel ports (Port0, Port2 and Port3) are brought out to the connectors J4, J5 and J6. The exact pinoutof any of these connectors is shown below with reference to figure 3.2468101357 9Figure 3: 10 way Connector Port

ADuC812 Evaluation Board Reference GuidePin Function Pin Function1 PortX.0 6 PortX.52 PortX.1 7 PortX.63 PortX.2 8 PortX.74 PortX.3 9 DGND5 PortX.4 10 DGNDTable 2: Pin functions for Port0, Port2 and Port3 connectors J3, J6, J7J4/J9/J10 Power Supply ConnectionsJ4 allows for the connection between the evaluation board and the 9V power supply provided in theADuC812 QuickStart Development System.J9 and J10 allow for the connection of a typical 9V battery to the evaluation board.J5 (SPI/I 2 C Connector)J5 is situated to the left side of the board and gives access to both the SPI and I 2 C interfaces. The pinout isas in fig 3 with the orientation vertical. Look for the pin1 marker on the evaluation board.Pin Function Pin Function1 SCLOCK 6 DGND2 DGND 7 663 SDATA/MOSI 8 DGND4 DGND 9 NC5 MISO 10 DGNDTable 3: Pin functions for SPI connector J7J8 (Timer/Strobe)The timer/strobe control signals on the ADuC812 are all brought out to a 10 way connection port justabove the prototyping. The exact pinouts of the ports are shown in table 2 with reference to the connectorshown in figure 3.Pin Function Pin Function1 T0 6 T22 T1 7 T2EX3 ($ 8 DGND4 36(1 9 DGND5 ALE 10 DGNDTable 4: Timer/Strobe connector J3

ADuC812 Evaluation Board Reference Guide(5) LDR DEMONSTRATION CIRCUITUSING THE LDR CIRCUIT:As can be seen from examining the schematic an example LDR circuit is connected shown in Figure 2below:VDDVDDLK1ADCDACLK2ApplicationCodeCircuit diagram of the LDR CircuitUsing the sample code in \code\adc\adcldr.asm the variation in the resistance of the ldr can be seen by thereducing brightness of the output led as the amount of light is decreased.

ADuC812 Evaluation Board Reference GuideADuC812 Evaluation Board Parts List(6) ADUC812 EVALUATION BOARD PARTS LISTComponent Qty Part Description Order No Order FromEVAL- ADuC812QS QuickStart PCB 1 PCB-1 2 sided surface mount PCBPCB Stand-off 4 Stand-off Stick on mounting feet 148-922 FarnellU1 1 ADuC812 MicroConverter (52PQFP) ADIU2,U3 2 OP491G Quad OP-Amp, 14 pin SOIC ADIU4,U10 2 OP284ES Dual Op-Amp, 8 pin SOIC ADIU5 1 MM74HC14M Hex Schmitt-Trigger Inv, 14 pin SOIC 379-268 FarnellU6 1 NC7S08M5 Single And Gate 685-925 FarnellU7 1 HY62256B LLT1-70 32Kx8 CMOS SRAM, 28Pin TSOP 352-8509 FarnellU8 1 ADM908RART Power on Reset Supervisory Chip ADIU9 1 MC7805CT Fixed 5V Linear Voltage Regulator 701-853 FarnellU11 1 AD820AR Single OP-Amp, 8 pin SOIC ADIU13 1 NE555D Timer, 8 pin SOIC 409-352 FarnellU14,U15 2 MM74HC573WM Octal D-Type Transparent Latch, SOIC 379-580 FarnellSW1,SW2 2 Push Button Switch PCB Mounted Push Button Switch 176-432 FarnellD1 1 Red Led 1.8mm miniture red led 657-025 FarnellD2 1 Green Led 1.8mm miniture green led 657-037 FarnellD3,D4 2 1N4001 Diode 365-117 FarnellD5 1 Yellow Led 1.8mm miniture red led 657-049 FarnellQ1 1 BC856 PNP General Purpose Transistor 506-266 FarnellL1,L2 2 Ferrite Bead Surface Mount Inductor, 1206 Case 557-330 FarnellLK1-7,LK9-10, 9 SPST Switch Header 2x1 SPST Switch Header 986-501 FarnellLK12 1 SP Changeover Header SP3T Changeover Header JsC4-16-GO Futora ElectronicsLK11 1 2x1(with Friction Lock) Square Pin Header with friction lock 143-139 FarnellR1-R8 8 51R Surface Mount Resistor, 0805 Case 771-181 FarnellVersion 1.0 Analog Devices Inc., MicroConverter ®www.analog.com/microconverter