Analog Devices ADuC7024 Manual de usuario

ADUC7024 EVALUATION BOARD

REFERENCE GUIDE

MICROCONVERTER

ADUC7024 DEVELOPMENT SYSTEM

ADuC7024 Evaluation Board Reference Guide

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 2 of 15 www.analog.com/microconverter

CONTENTS:

Evaluation Board Reference Guide:

1) Evaluation Board Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2) Evaluation Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3) DIP Switch link Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4) External Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5) Demonstration Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

6) Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

7) Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

ADuC7024 Evaluation Board Reference Guide

(1) Evaluation Board Overview

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 3 of 15 www.analog.com/microconverter

(1) EVALUATION BOARD OVERVIEW

The ADuC7024 Evaluation board has the following features :

•2 Layer PCB (4” X 5” Form Factor)

•9V power supply regulated to 3.3V on board

•4 pin UART header to connect to RS232 Interface Cable

•20-pin standard JTAG connector

•Demonstration Circuit

•32.768kHz Watch Crystal to drive the PLL clock

•ADR291 2.5V External Reference Chip

•Reset/Download/IRQ0 Push Buttons

•Power Indicator/General Purpose LEDs

•Access to all ADC inputs and DAC output from external header. All device Ports are brought out

to external header pins.

•Surface mount and through hole general purpose prototype area

THIS DOCUMENT REFERS TO THE MICROCONVERTER ADUC7024 EVAL BOARD REV B1

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 prototype area appearing in the bottom 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 ground

plane is split with the analog section on the left hand side and a digital plane on the right hand side of the board. The

regulated 3.3V power supply is routed directly to the digital section and is filtered before being routed into the analog

section of the board.

ADuC7024 Evaluation Board Reference Guide

(2) Evaluation Board Features

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 4 of 15 www.analog.com/microconverter

(2) EVALUATION BOARD FEATURES

Power Supply:

The user should connect the 9V power supply via the 2.1mm input power socket (J5). The input

connector is configured as ‘CENTER NEGATIVE’ i.e. GND on the center pin and +9V on the outer

shield.

This 9V supply is regulated via a linear voltage regulator (U5). The 3.3V regulator output is used to drive

the digital side of the board directly. The 3.3V supply is also filtered and then used to supply the analog

side of the board.

When on, the LED (D3) indicates that a valid 3.3V supply is being driven from the regulator circuit. All

active components are decoupled with 0.1uF at device supply pins to ground.

RS232 Interface:

The ADuC7024 (U1) P1.1 and P1.0 lines are connected to the RS232 Interface Cable via connector (J1).

The Interface Cable generates the required level shifting to allow direct connection to a PC serial port.

Ensure that the cable supplied is connected to the board correctly i.e. DVDD is connected to DVDD and

DGND is connected to DGND.

Emulation Interface:

Non-intrusive emulation and download are possible on the ADuC7024 via JTAG by connecting a JTAG

emulator to the J4 connector.

Crystal Circuit:

The board is fitted with a 32.768kHz crystal, from which the on-chip PLL circuit can generate a

41.78MHz clock.

External Reference (ADR291)

The external 2.5V reference chip (U2) has two functions. It is provided on the evaluation board to

demonstrate the external reference option of the ADuC7024 but its main purpose is to generate the VOCM

voltage of the differential amplifier if required.

Reset/Download/IRQ0 Push Buttons:

A RESET push button is provided to allow the user to manually reset the part. When inserted the RESET

pin of the ADuC7024 will be pulled to DGND. Because the RESET pin on the ADuC7024 is Schmidt

triggered internally there is no need to use an external Schmidt trigger on this pin.

When inserted the IRQ0 push button switch drives P0.4/IRQ0 high. This can be used to initiate an

external interrupt 0.

ADuC7024 Evaluation Board Reference Guide

(2) Evaluation Board Features

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 5 of 15 www.analog.com/microconverter

To enter serial download mode the user must pull the P0.0/BM pin low while reset is toggled. On the

evaluation board serial download mode can be easily initiated by holding down the serial download push

button (S2) while inserting and releasing the reset button (S3) as illustrated in Figure 1.

(RESET=1)

(BM=1)

(

)S3&S2RELE

SED

(BM=0)

(RESET=1)

(B) PUSH S2

(RESET=1)

(BM=0)

(D) RELEASE S3

(BM=0)

(RESET=0)

(BM=1)

(RESET=1)

(E) RELEASE S2

Figure 1: Entering Serial Download Mode on the Evaluation Board.

Power Indicator/General Purpose LEDs:

A power LED (D3) is used to indicate that a sufficient supply is available on the board. A general

purpose LED (D2) is directly connected to P4.2 of the ADuC7024. When P4.2 is cleared the LED will be

turned ON and when P4.2 is set the LED will be turned off.

Analog I/O Connections:

All analog I/O are brought out on header J3.

ADC0 and ADC1 are buffered using a AD8606 to evaluate single–ended and pseudo differential mode. A

potentiometer can be connected to ADC0 buffered.

ADC3 and ADC4 can be buffered with a single-ended to differential op-amp on board, the AD8132 used

to evaluate the ADC in fully differential mode.

ADC2 and ADC5 to ADC9 are not buffered. Be sure to follow the datasheet recommendation when

connecting signals to these inputs.

DAC1 can be used to controlled the brightness of the green LED D1, when connected via the S1 switch.

General Purpose prototype area

General Purpose prototype areas are provided at the bottom of the evaluation board for adding external

components as required in the users application. As can be seen from the layout AVDD, AGND, VDDIO

and DGND tracks are provided in this prototype area.

ADuC7024 Evaluation Board Reference Guide

(3) Link Options

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 6 of 15 www.analog.com/microconverter

(3) DIP SWITCH LINK OPTIONS

S1-1 VREF

Function: Connects the output of the 2.5V external reference (ADR291) to the VREF pin (pin #55) of

the ADuC7024.

Use: Slide S1-1 to the ON position to connect the external reference to the ADuC7024.

Slide S1-1 to the OFF position to use the internal 2.5V reference or a different external

reference on VREF pin of J3 header.

S1-2 VOCM

Function: Connects 1.67V to the VOCM pin of the AD8132. No extra DC voltage is required on the

board to use the ADC in differential mode.

Use : Slide S1-2 to the ON position to connect VOCM of the differential amplifier to 1.67V, divided

output of the ADR291 reference.

Slide S1-2 to the OFF position to use a different voltage for VOCM by connecting a DC

voltage to the VOCM pin of J3 header. Note that VOCM value is dependant on reference value as

shown in Table 1:

VREF V

OCM min VOCM max

2.5V 1.25V 2.05V

2.048V 1.024V 2.276V

1.25V 0.75V 2.55V

Table 1: VOCM range

S1-3 POT

Function: Connects the potentiometer output to ADC0. This input is buffered by an AD8606. This is for

demonstration purposes.

Use : Slide S1-3 to the ON position to connect the potentiometer to the op-amp of ADC0 input

channel.

Slide S1-3 to the OFF position to use ADC0 input on J3 header.

S1-4 ADC3

Function: Brings out ADC3 (pin #64) on J3 header.

Use: Slide S1-6 to the ON Position to connect directly ADC3 of J3 header to ADC3 pin (pin #64)

of the ADuC7024.

Slide S1-6 to the OFF Position to disconnect ADC3 of J3 header from ADC3 pin (pin #64)

of the ADuC7024.

ADuC7024 Evaluation Board Reference Guide

(3) Link Options

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 7 of 15 www.analog.com/microconverter

S1-5 VIN-

Function: Connects -OUT of the single-ended to differential op-amp (AD8132) to ADC3. S1-5 and S1-

6 must be used together, when VIN- is in the ON position, VIN+ must also be in the ON

position to use the differential op-amp on channel ADC3 and ADC4.

Use: Slide S1-5 to the ON Position to connect –OUT of the AD8132 to ADC3.

Slide S1-5 to the OFF Position to use ADC3 without the AD8132.

S1-6 VIN+

Function: Connects +OUT of the single-ended to differential op-amp (AD8132) to ADC4. When VIN+

is in the ON position, VIN- must also be in the ON position to use the differential op-amp on

channel ADC3 and ADC4.

Use: Slide S1-6 to the ON Position to connect +OUT of AD8132 to ADC4.

Slide S1-6 to the OFF Position to use ADC4 without the AD8132.

S1-7 ADC4

Use: Slide S1-6 to the ON Position to connect directly ADC4 of J3 header to ADC4 pin (pin #1) of

the ADuC7024.

Slide S1-6 to the OFF Position to disconnect ADC4 of J3 header from ADC4 pin (pin #1) of

the ADuC7024.

S1-8 LED

Function : Connects the DAC1 output to the green LED of the demo circuit, D1.

Use : Slide S1-7 to the ON position to connect the DAC1 output to D1.

Slide s1-7 to the OFF position to use DAC1 output on J3 header.

ADuC7024 Evaluation Board Reference Guide

(4) External Junctions (Connectors)

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 8 of 15 www.analog.com/microconverter

(4) EXTERNAL CONNECTORS:

J3 Analog I/O Connector

The analog I/O connector J3 provides external connections for all ADC inputs, reference inputs and DAC

outputs. The pinout of the connector is shown below in Table 2.

Pin # Pin Description

J3-1 AVDD

J3-2 AGND

J3-3 VREF

J3-4 DACREF

J3-5 ADC0

J3-6 ADC1

J3-7 ADC2

J3-8 ADC3

J3-9 ADC4

J3-10 ADC5

J3-11 ADC6

J3-12 ADC7

J3-13 ADC8

J3-14 ADC9

J3-15 VDIFF

J3-16 VOCM

J3-17 DAC0

J3-18 DAC1

J3-19 ADCNEG

J3-20 AGND

Table 2: Pin functions for Analog I/O connector J3

J5 Power Supply Connections

J5 allows for the connection between the evaluation board and the 9V power supply provided in the

ADuC7024 Development System.

J4 Emulation Connector

J4 provides a connection of the evaluation board to the PC via a JTAG emulator.

J1 Serial Interface Connector

J1 provides a simple connection of the evaluation board to the PC via a PC serial port cable provided with

the AduC7024 Development System.

J2 Digital I/O Connector

ADuC7024 Evaluation Board Reference Guide

(4) External Junctions (Connectors)

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 9 of 15 www.analog.com/microconverter

The digital I/O connector J2 provides external connections for all GPIOs. The pinout of the connector is

shown below in Table 3, with details of the pin functions.

Pin # Pin Description

J2-1 P4.5

PLAO[13]

J2-2 P4.4

PLAO[12]

J2-3 P4.3

PLAO[11]

J2-4 P4.2

PLAO[10]

J2-5 P1.0

T1/SIN/SCL0/PLAI[0]

J2-6 P1.1

SOUT/SDA0/PLAI[1]

J2-7 P1.2

RTS/SCL1/PLAI[2]

J2-8 P1.3

CTS/SDA1/PLAI[3]

J2-9 P1.4

IRQ2/RI/CLK/PLAI[4]

J2-10 P1.5

IRQ3/DCD/MISO/PLAI[5]

J2-11 P4.1

PLAO[9]

J2-12 P4.0

PLAO[8]

J2-13 P1.6

DSR/MOSI/PLAI[6]

J2-14 P1.7

DTR/CSL/PLAO[0]

J2-15 P3.7

PWMSYNC/PLAI[15]

J2-16 P3.6

PWMTRIP/PLAI[14]

Pin # Pin Description

J2-17 P0.7

ECLK/XCLK/SIN/PLAO[4]

J2-18 P2.0

CONVSTART/SOUT/PLAO[5]

J2-19 P0.5

IRQ1/ADCBUSY/PLAO[2]

J2-20 P0.4

IRQ0/PWMTRIP/PLAO[1]

J2-21 P3.5

PWM2L/PLAI[13]

J2-22 P3.4

PWM2H/PLAI[12]

J2-23 P0.3

TRST/ADCBUSY

J2-24 P3.3

PWM1L/PLAI[11]

J2-25 P3.2

PWM1H/PLAI[10]

J2-26 P3.1

PWM0L/PLAI[9]

J2-27 P3.0

PWM0H/PLAI[8]

J2-5 P0.6

T1/MRST/PLAO[3]

J2-28 P0.0

CMP/PLAI[7]

J2-30 P4.7

PLAO[15]

J2-31 P4.6

PLAO[14]

J2-32 DGND

Table 3: Pin functions for digital I/O connector J2

ADuC7026 Evaluation Board Reference Guide

(5) Potentiometer Demonstration Circuit

Rev. 1.0 Analog Devices Inc., MicroConverter

Page 10 of 15 www.analog.com/microconverter

(5) POTENTIOMETER DEMONSTRATION CIRCUIT

ADC DAC

Application

Code

Figure 2: Circuit diagram of the RTD Circuit

Using the sample code in pot.c in the code example folder, the variation in the potentiometer resistance

can be seen on the output LED.

Note that the internal and external reference are 2.5V, which gives an ADC input range of 0V to 2.5V in

single-ended mode. The potentiometer can give a voltage between 0V and AVDD = 3.3V.

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