Analog Devices MicroConverter ADuC824 Reference Manual Download | Manualshive

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Summary of Contents for MicroConverter ADuC824

Page 1: ...ADUC824 EVALUATION BOARD REFERENCE GUIDE MICROCONVERTER ADUC824 QUICKSTART DEVELOPMENT SYSTEM ...

Page 2: ...Page 2 of 14 www analog com microconverter CONTENTS Evaluation Board Reference Guide 1 Evaluation Board Overview 3 2 Evaluation Board Features 4 3 Link options 6 4 External Junctions Connectors 9 5 RTD Temperature Demonstration Circuit 11 6 Parts List 12 Figure 1 ADuC824 Evaluation Board ...

Page 3: ...rence Chip see section 2 Reset External Interrupt 0 Push Buttons see section 2 Power Indicator General Purpose LEDs see section 2 Example RTD Temperature Sensor Demonstration Circuit see section 5 NOTES 1 All references in this document to physical orientation of components on the board are made with respect to a component side view of the board with the battery connections appearing in the top ri...

Page 4: ...ctly to Evaluation Board Analog I O Connections The inputs to the primary ADC are filtered with a first order RC anti aliasing filter There is an option LK5 to bias the AIN2 analog input to 2 5V There is also an option LK4 to short both analog input channels AIN1 AIN2 to allow various noise parameters to be more easily evaluated See section 1 2 for Link descriptions The DAC output is buffered befo...

Page 5: ...will cause both U5 and U9 to be enabled together and will cause confliction on the data bus External Program Memory Socket An external program memory socket is available on the ADuC824 evaluation board This allows the user to easily connect in an external program memory Note If using an external program meory at U9 make sure that LK13 is removed as described above Crystal Circuit The board is fitt...

Page 6: ...s approx will be required for the part to be actually released from reset after the button is released An INT0 INT0 push button switch is provided to allow the user perform external interrupts easily The INT0 signal is Schmitt triggered U6 to prevent noise on the rising edge of INT0 to cause multiple interrupts as it passes the trip point This Schmitt trigger also inverts the signal Power Indicato...

Page 7: ...EE program memory Note This link can also be used with the Accutron ACE emulator The single pin emulator simply connects to this link LK3 2x1 PSEN Pulldown for Se7rial Download Debug Mode Function Allows the user to enter serial download or debug mode Use Slide LK3 into the ON position to enter serial download mode or debug mode on power on or after a hardware reset i e pressing reset button Slide...

Page 8: ... AD780 or the RTD reference voltage Use Slide LK8 to Position A to connect REFIN to the 2 5V output of the AD780 Slide LK8 to Position B to connect the positive end of the RTD circuit reference voltage the voltage dropped across R11 to REFIN use with RTD temp demo circuit Slide LK8 to Center Position to connect an external reference at J2 8 to REFIN LK9 3x1 External Data Memory Function This link ...

Page 9: ...2 2x1 Connect AIN2 to RTD Function Connects the low end of the external RTD circuit to AIN2 Use Slide LK12 into the ON position to connect the external RTD to AIN2 Slide LK12 into the OFF position to disconnect the RTD from AIN2 LK13 2x1 Connect PSEN to External Data Memory Function Allows the External Data Memory to be used as both an External Program Memory and an External Data Memory Use Slide ...

Page 10: ...and orientation of this connector is shown below Figure 2 The Analog I O connector J2 Pin Function Pin Function 1 DGND 10 AIN2 2 DVDD 11 AIN3 3 AGND 12 AIN4 DAC pin12 4 AVDD 13 DAC O P Buffered 5 IEXC1 DAC pin3 14 O P OpAmp Spare 6 IEXC2 AIN5 15 2 5V AD780 O P 7 REFIN 16 In OpAmp Spare 8 REFIN 17 In OpAmp Spare 9 AIN1 18 AGND Table 1 Pin functions for Analog I O connector J2 J3 Timer Strobe The ti...

Page 11: ...t0 Port2 and Port3 connectors J4 J5 J6 J7 SPI I2 C Connector J7 is situated to the left side of the board and gives access to both the SPI and I2 C interfaces The pinout is as in fig 3 with the orientation vertical Look for the pin1 marker on the evaluation board Pin Function Pin Function 1 SCLOCK 6 DGND 2 DGND 7 SS 3 SDATA MOSI 8 DGND 4 DGND 9 NC 5 MISO 10 DGND Table 4 Pin functions for SPI conne...

Page 12: ...the current is outputted from pin4 slide to position B LK11 Slide to ON position LK12 Slide to ON position LK4 Slide to OFF position LK5 Slide to OFF position The RTD is excited by routing the ADuC824 excitation current sources through LK10 This DC excitation current generates a reference voltage across R11 This reference voltage is routed back to the Refin Refin inputs via LK7 and LK8 As describe...

Page 13: ...IC 379 268 Farnell U7 1 MC7805CT Fixed 5V Linear Voltage Regulator 701 853 Farnell U8 1 OP284ES Dual Op Amp 8 pin SOIC ADI U10 1 AD780 Bandgap reference ADI U11 1 ADM809RART Power on Reset Supervisory Circuit ADI U12 1 NC7S08M5 Single AND gate 685 925 Farnell SW1 SW2 2 Push button Switch PCB mounted push button switch 176 432 Farnell D1 1 Red Led 1 8mm miniature red led 657 025 Farnell D2 1 Green ...

Page 14: ...se transistor 506266 Farnell L 1 Ferrite Bead Surface Mount Inductor 1206 Case 557 330 Farnell LK1 LK3 LK5 LK11 LK13 7 SPST Switch Header 2x1 SPST Switch Header 986 501 Farnell LK6 LK10 5 SP Changeover Header SP3T Changeover Header JsC4 16 GO Futora Electronics LK2 1 2x1 with friction lock Square Pin Header with friction lock 143 139 Farnell J1 1 9 way socket RA D Type PCB mounted Socket 150 820 F...

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