ANALOG DEVICES UG-029 Service Manual

Evaluation Board User Guide

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UG-029

ADuC7060 Evaluation Board User Guide

MicroConverter® ADuC7060 Development System

FEATURES

2-layer PCB (4 in. × 5 in. form factor)
9 V power supply regulated to 3.3 V and 2.5 V on board
4-pin UART header to connect to RS-232 interface cable
20-pin standard JTAG connector
Demonstration circuit

32.768 kHz watch crystal to drive the PLL clock
ADR280 1.2 V 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

EVALUATION KIT CONTENTS

mIDAS-Link JTAG programming POD
CD containing evaluation software including user manuals,

data sheets, example code, ARMWSD, and evaluation

compilers
9 V power supply
RS-232 to UART cable
USB cable

GENERAL DESCRIPTION

This user guide refers to the ADuC7060 evaluation board.
This evaluation board allows evaluation of the ADuC7060
and ADuC7061 parts. The ADuC7060 is the superset of the
ADuC706x series, and all features of the ADuC7061 can be
evaluated using the ADuC7060. The ADuC7060 contains an
ARM7TDMI core, 32 kB of flash, 4 kB of SRAM, dual 24-bit
sigma-delta (Σ-Δ) ADCs, and a 12-bit DAC as well as many
other features.

This evaluation board allows a user to program the ADuC7060
via the JTAG or the UART interfaces. The user may also debug
their source code through the JTAG interface.

In this user guide, all references to the 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.

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 side and a digital
plane on the right side of the board. The regulated 2.5 V power
supply is routed directly to the digital section and is filtered
before being routed into the analog section of the board.

See the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 12

UG-029 Evaluation Board User Guide

TABLE OF CONTENTS

Features .............................................................................................. 1

Evaluation Kit Contents ................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Evaluation Board Hardware ............................................................ 3

Power Supply ................................................................................. 3

RS-232 Interface ........................................................................... 3

Emulation Interface ...................................................................... 3

Crystal Circuit ............................................................................... 3

External Reference (ADR280) .................................................... 3

Reset/Download/IRQ0 Push Buttons ........................................ 3

Power Indicator/General Purpose LEDs ................................... 4

Analog I/O Connections ............................................................. 4

REVISION HISTORY

8/09—Revision 0: Initial Version

General-Purpose Prototype Area ................................................4

DIP Switch Link Options .................................................................5

External Connectors .........................................................................6

Analog I/O Connector J2 .............................................................6

Power Supply Connector J1 .........................................................6

Emulation Connector J5 ...............................................................6

Serial Interface Connector J4 .......................................................6

Digital I/O Connector J3 ..............................................................6

RTD Demonstration Circuit ............................................................7

Evaluation Board Schematic and Artwork .....................................8

Bill of Materials ............................................................................... 11

ESD Caution................................................................................ 11

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Evaluation Board User Guide UG-029

EVALUATION BOARD HARDWARE

POWER SUPPLY

Connect the 9 V power supply via the 2 mm input power socket
(J1). The input connector is configured as a center negative, that
is, with GND on the center pin and 9 V on the outer shield.

The 9 V supply is regulated via the linear voltage regulator, U3.
The 2.5 V regulator output is used to drive the digital side of the
board directly. The 2.5 V supply is also filtered and then used to
supply the analog side of the board. This regulator supplies the
ADuC7060 microcontroller.

The 9 V supply is also regulated via the linear voltage regulator,
U2. The 3.3 V output of this regulator is used to supply the
JTAG programming interface. This device does not supply the
ADuC7060 device.

When on, the LED (D4) indicates that a valid 2.5 V supply is
driven from the regulator circuit. All active components are
decoupled with 0.1 μF capacitors at device supply pins to
ground.

RS-232 INTERFACE

The ADuC7060 (U1) P1.1 and P1.0 lines are connected to the
RS-232 interface cable via Connector J4. 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, that is, DVDD is connected to DVDD
and DGND is connected to DGND.

EMULATION INTERFACE

Nonintrusive emulation and download are possible on the
ADuC7060 via JTAG by connecting a JTAG emulator to the
J5 connector.

CRYSTAL CIRCUIT

The board is fitted with a 32.768 kHz crystal, from which the
on-chip PLL circuit can generate a 10.24 MHz clock.

EXTERNAL REFERENCE (ADR280)

The external 1.2 V reference chip, ADR1, has two functions.

• It is provided on the evaluation board to demonstrate the

external reference option of the ADuC7060.

• It can also be used as an input source to AIN1, if required.

RESET/DOWNLOAD/INT0 PUSH BUTTONS

INT0

The
the ADuC7060/ADuC7061 data sheet. Note that this is the
same push button and only differs in name.

A reset push button is provided to allow the user to reset the
part manually. When pressed, the reset pin of the ADuC7060 is
pulled to DGND. Because the
Schmidt-triggered internally, there is no need to use an external
Schmidt trigger on this pin.

When pressed, the
high. This can be used to initiate an External Interrupt 0.

To enter serial download mode, pull the NTRST/
low while reset is toggled. On the evaluation board, serial
download mode can be easily initiated by holding down the
serial download push button (S3) while pressing and releasing
the reset button (S1).

push button is referred to as the

RESET

INT0

push button switch drives P0.4/IRQ0

IRQ0

push button in

pin on the ADuC7060 is

BM

pin

Rev. 0 | Page 3 of 12

UG-029 Evaluation Board User Guide

POWER INDICATOR/GENERAL PURPOSE LEDS

A power LED (D4) is used to indicate that a sufficient supply is
available on the board. A general-purpose LED (D6) is directly
connected to P1.6 of the ADuC7060. When P1.6 is cleared, the
LED is turned on. When P1.6 is set, the LED is turned off.

ANALOG I/O CONNECTIONS

Note that the ADC0/ADC1 pins and the AIN0/AIN1 pins are
the same pins in this user guide. Both sets use the function and
differ only in name.

All analog I/O connections are brought out on Header J2.

The primary ADC inputs, AIN0 and AIN1, are connected to
an RTD demonstration circuit (see Figure 1). The component,
RTD1 is a surface-mount RTD in a 1206 package. It is stimu­lated by the excitation current source, IEC0 from the ADuC7060,
and is measured differentially by the primary ADC. R1 is the

5.6 kΩ reference resistor in the circuit.

The DAC output is buffered externally using the OP293 op amp
device, U4.

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 user’s application. As can be seen from the
layout in Figure 4, AV
provided in this prototype area.

, AGND, VDD, and DGND tracks are

DD

Rev. 0 | Page 4 of 12