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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
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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
Rev. 0 | Page 2 of 12
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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
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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
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Evaluation Board User Guide UG-029
DIP SWITCH LINK OPTIONS
Table 1.
Option Name Function Use
S4-1 RTD AIN0
S4-2 RTD AIN1
S4-3 RTD REFIN+
S4-4 RTD REFIN−
S4-5 1.2V REFIN+
S4-6 AIN1 BIAS
S4-7 EXT_REF
S4-8 GND AINCOM Connects AGND to Pin 13 of J2.
Connects the positive side of the RTD to the AIN0
pin (Pin 20).
Connects the negative side of the RTD to the
AIN1 pin (Pin 19).
Connects the positive side of the reference resistor (R1) in the RTD demo circuit to the VREF+ pin
(Pin 21).
Connects the negative side of the reference resistor (R1) in the RTD demo circuit to the VREF− pin
(Pin 22).
Connects the ADR280 1.2 V precision reference
voltage to the VREF+ pin (Pin 21).
Connects the ADR280 1.2 V precision reference
voltage to the AIN1 pin (Pin 19).
Brings the output of the ADR280 reference
device to test Pin 13 of J2.
Note: Never turn S1-7 and S1-8 on at the same
time as this shorts the external reference output
to GND.
Note: Never turn S1-7 and S1-8 on at the same
time as this shorts the external reference output
to GND.
Slide S1-1 to the on position to connect the positive side of
the RTD to the ADuC7060.
Slide S1-1 to the off position to disconnect the RTD from AIN0.
Slide S1-2 to the on position to connect the negative side of
the RTD to the ADuC7060.
Slide S1-2 to the off position to disconnect the RTD from AIN1.
Slide S1-3 to the on position to connect the positive side of
the reference resistor (R1) to the VREF+ pin.
Slide S1-3 to the off position to disconnect the reference
resistor from the VREF+ pin.
Slide S1-4 to the on position to connect the negative side of
the reference resistor (R1) to the VREF− pin.
Slide S1-4 to the off position to disconnect the reference
resistor from the VREF− pin. In this position, the VREF− pin is
connected to AGND.
Slide S1-5 to the on position to connect the ADR280 1.2 V
precision reference voltage to the VREF+ pin.
Slide S1-5 to the off position to disconnect the ADR280 1.2 V
reference device from VREF+.
Slide S1-6 to the on position to connect the ADR280 1.2 V
precision reference voltage to the AIN1 pin.
Slide S1-6 to the off position to disconnect the ADR280 1.2 V
reference device from AIN1.
Slide S1-7 to the on position to connect the ADR280
reference device to Pin 13 of J2.
Slide S1-7 to the off position to disconnect the ADR280
reference device from Pin 13 of J2.
Slide S1-8 to the on position to connect Pin 13 of J2 to GND.
Slide S1-8 to the off position to disconnect Pin 13 of J2 from
GND.
Rev. 0 | Page 5 of 12
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UG-029 Evaluation Board User Guide
EXTERNAL CONNECTORS
ANALOG I/O CONNECTOR J2
Connector J2 provides external connections for all ADC inputs,
reference inputs, and DAC outputs. The pinout of the connector
is shown in Tabl e 2 .
Table 2. Pin Functions for Analog I/O Connector J2
Pin Number Pin Function
J2-1 AGND
J2-2 AVDD
J2-3 AIN0
J2-4 AIN1
J2-5 AIN2
J2-6 AIN3
J2-7 VREF−
J2-8 VREF+
J2-9 AIN4
J2-10 AIN5
J2-11 AIN6
J2-12 AIN7
J2-13 EXT_REF
J2-14 DAC (unbuffered)
J2-15 DAC (buffered)
J2-16 AIN8
J2-17 AIN9
J2-18 V0, op amp output
J2-19 V−, op amp inverting input
J2-20 V+, op amp noninverting input
J2-21 GND_SW
J2-22 IEXC1, Current Excitation Source 1
POWER SUPPLY CONNECTOR J1
Connector J1 allows for connection between the evaluation
board and the 9 V power supply provided in the ADuC7060
development system.
EMULATION CONNECTOR J5
Connector J5 provides a connection of the evaluation board to
the PC via a JTAG emulator.
SERIAL INTERFACE CONNECTOR J4
Connector J4 provides a simple connection of the evaluation
board to the PC via a serial port cable provided with the
ADuC7060 development system.
DIGITAL I/O CONNECTOR J3
The digital I/O connector, J3, provides external connections for
all GPIOs. The pinout of the connector is shown in Table 3,
with details of the pin functions.
Table 3. Pin Functions for Digital I/O Connector J3
Pin No. Pin Function
J3-1 P1.6
J3-2 P1.5
J3-3 P1.4
J3-4 P1.3
J3-5 P1.2
J3-6 P0.6
J3-7 P0.5
J3-8 P2.1
J3-9 P2.0
J3-10 P1.1/SOUT
J3-11 P1.0/SIN
J3-12 P0.4/INT0
J3-13 P0.3
J3-14 P0.2
J3-15 P0.1
J3-16 P0.0
J3-17
J3-18 DGND
J3-19 DGND
J3-20 DVDD
RESET
Rev. 0 | Page 6 of 12
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Evaluation Board User Guide UG-029
RTD DEMONSTRATION CIRCUIT
The on-board RTD is measured by the primary ADC by using
the sample code in the RTD.c file. The RTD.c file is located in
the code example folder of the software CD included with the
evaluation board kit. The IEXC0 pin provides an excitation
current through the RTD. The voltage drop across the RTD
is measured differentially by ADC0 through input channels
ADC0 and ADC1. The reference resistor, R1, is connected to
the VREF+ of the ADuC7060.
For this test, set Switch 1 to Switch 4 of S4 to the on position.
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.
IEXC0
RTD
R
Figure 1. Diagram of the RTD Circuit
AIN0 (T+)
AIN1 (T–)
VREF+
REF
VREF–
GND_SW
0.2mA~1mA
08322-001
Rev. 0 | Page 7 of 12
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UG-029 Evaluation Board User Guide
EVALUATION BOARD SCHEMATIC AND ARTWORK
08322-002
Figure 2. EVAL-ADuC7060 Board Schematic and Layout
Rev. 0 | Page 8 of 12
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Evaluation Board User Guide UG-029
08322-003
Figure 3. Evaluation Board Schematic
Rev. 0 | Page 9 of 12
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UG-029 Evaluation Board User Guide
08322-004
Figure 4. Evaluation Board Silkscreen
Rev. 0 | Page 10 of 12
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Evaluation Board User Guide UG-029
BILL OF MATERIALS
Table 4.
Qty Component Description Order No. Supplier
1 EVAL-ADuC7060QS QuickStart PCB Two-sided surface-mount PCB-1
4 PCB Stand-offs Stand-off, stick on mounting feet 1165061 Farnell
1 U1 MicroConverter ADuC7060 Analog Devices, Inc.
1 ADR1 Band gap reference ADR280ARTZ-REEL7 Analog Devices, Inc.
1 U3 Fixed 2.5 V linear voltage regulator ADP3333ARM-2.5Z Analog Devices, Inc.
1 U4 Dual op amp, (8-lead SOIC) OP293ESZ Analog Devices, Inc.
1 U2 Fixed 3.3 V linear voltage regulator ADP3333ARM3.3Z Analog Devices, Inc.
1 Y1 32.768 kHz watch crystal FEC 3160312 Farnell
1 S4 SW/8-way DIP switch FEC 9479112 Farnell
3 S1, S2, S3 PCB-mounted push-button switch FEC 177807 Farnell
1 D4 1.8 mm miniature LED (green) FEC 515620 Fairchild Semiconductor
1 D6 1.8 mm miniature LED (red) FEC 515607 Fairchild Semiconductor
1 D1 PRLL4002 diode BAV103TPMSCT-ND Digi-Key
6 C3, C14, C16, C17, C29, C30
14 C1, C2, C4, C5, C8 to C13, C24
1 C15
9 C6, C7, C20 to C27
2 C18, C19
1 RTD 100 Ω Class B 0805 RTD PCS 1.1503.1
1 R1 5.6 kΩ surface-mount resistor, 0605 case FEC 9331352 Farnell
10 μF surface-mount tantalum capacitor,
TAJ-B case
0.1 μF surface-mount ceramic capacitor,
0603 case
4.7 μF surface-mount tantalum capacitor,
TAJ-B case
10 nF surface-mount ceramic capacitor,
0603 case
12 pF surface-mount ceramic capacitor,
0603 case
FEC 1135105 Farnell
FEC 9406204 Farnell
FEC 1432459 Farnell
FEC 722236 Farnell
FEC 721979 Farnell
Enercorp (Embassy
Components)
3 R12, R12, R21 560 Ω surface-mount resistor, 0603 case FEC 9331344 Farnell
14 R2 to R5, R11 to R20 0 Ω surface-mount resistor, 0603 case FEC 9331662 Farnell
3 R8 to R10
1 R7 1.5 Ω surface-mount resistor, 0603 case FEC 9331832 Farnell
4 R22, R26 to R28 100 kΩ surface-mount resistor, 0603 case FEC 9233628 Farnell
1 L1
1 J4 4-pin, 90° single row header TSM-104-02-T-SH Samtec
1 J3 34-pin straight single row header TSM-120-01-T-SV Samtec
1 J2 22-pin straight single row header TSM-122-01-T-SV Samtec
1 J5 20-pin connector TSM-104-02-T-SH Samtec
1 J1
1 kΩ or 4.7 Ω surface mount resistor, 0603
case
Ferrite bead surface-mount inductor,
1206 case
PCB mounted power socket (2 mm pin
diameter)
FEC 9330380 Farnell
FEC 9526862 Farnell
KLDX-SMT2-0202-A KYCON, Inc.
ESD CAUTION
Rev. 0 | Page 11 of 12
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UG-029 Evaluation Board User Guide
NOTES
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express,
implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under
any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the
right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not
authorized to be used in life support devices or systems.
©2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG08322-0-8/09(0)
Rev. 0 | Page 12 of 12
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