Atmel AT89RFD-08 User manual

AT89RFD-08 Reference Design
..............................................................................................
Hardware User Guide

AT89RFD-08 Hardware User Guide 1
4382E–MP3–05/06
Section 1
Introduction...........................................................................................1-1
1.1 Overview...................................................................................................1-1
1.1.1 Typical Applications............................................................................1-1
1.2 AT89RFD-08 Reference Design Features................................................1-4
Section 2
Using the AT89RFD-08 Board.............................................................2-7
2.1 Block Diagram...........................................................................................2-7
2.2 Power Supply............................................................................................2-8
2.2.1 5V to 9V power Supply.......................................................................2-8
2.2.2 3V power Supply ................................................................................2-8
2.2.3 Power Supply Source Connection......................................................2-9
2.2.4 “POWER“ LED....................................................................................2-9
2.3 AT89C51SND2C MP3 microcontroller....................................................2-10
2.3.1 Reset................................................................................................2-10
2.3.2 CPU Clock........................................................................................2-11
2.3.3 PLL Filter ..........................................................................................2-11
2.4 Communication Interfaces ......................................................................2-12
2.4.1 RS-232 .............................................................................................2-12
2.4.2 USB ..................................................................................................2-12
2.4.3 SPI....................................................................................................2-13
2.4.4 TWI...................................................................................................2-14
2.5 On-board Resources...............................................................................2-15
2.5.1 LEDs.................................................................................................2-15
2.5.2 2-key Keypad....................................................................................2-15
2.5.3 Secure Digital (SD) / MultiMedia Card (MMC) Area.........................2-15
2.6 Audio Interfaces......................................................................................2-16
2.6.1 Speaker 8 Ohms Output...................................................................2-16
2.6.2 Earphone 32 Ohms Output...............................................................2-16
2.7 Expansion Connector..............................................................................2-17
2.7.1 Nand Flash connection.....................................................................2-17
2.8 In-System Programming .........................................................................2-18
2.8.1 ISP Programming.............................................................................2-18
2.8.2 ISP Using Hardware Conditions.......................................................2-18
2.8.3 ISP Using Software Condition..........................................................2-18
2.9 Electrical Parameter Measurement.........................................................2-19
2.9.1 Configuration Pad.............................................................................2-19
2.9.2 AT89C51SND2C Configuration Pads...............................................2-19

Table of Contents
2AT89RFD-08 Hardware User Guide
4382E–MP3–05/06
2.9.3 Measurements..................................................................................2-20
2.10 Layout Guide...........................................................................................2-21
2.10.1 Power Supply ...................................................................................2-21
2.10.2 USB..................................................................................................2-22
2.10.3 Audio ................................................................................................2-22
2.11 FAQ.........................................................................................................2-23
Section 3
Technical Specifications.....................................................................3-33
Section 4
Technical Support...............................................................................4-35

AT89RFD-08 Hardware User Guide 1-1
4382E–MP3–05/06
Section 1
Introduction
Congratulations on your purchase of the C51 AT89RFD-08 Reference Design. It is
designed to give designers a quick start to develop code on the AT89C51SND2C and
for prototyping and testing of new designs.
1.1 Overview This document describes the AT89RFD-08 Reference Design dedicated to the
AT89C51SND2C C51 microcontroller. This board is designed to allow an easy evalua-
tion of the product using demonstration software.
To increase its demonstrative capabilities, this stand alone board has numerous serial
interfaces (RS232, USB, SPI & TWI) and on-board resources (keyboard & LEDs).
This user guide acts as a general getting started guide as well as a complete technical
reference for advanced users.
1.1.1 Typical Applications n MP3-Player
n PDA, Camera, Mobile Phone MP3
n Car Audio/Multimedia MP3
n Home Audio/Multimedia MP3

Introduction
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Figure 1-1. AT89RFD-08 Board
Reset ISP
Power Supply
Jumper Selection (J14)
Connector
AT89C51SND2
Earphone Jack
Speaker Jack
USB
OK
SELECT
SPI
Power Supply
3V UART
LED1 LED2
Auxiliary Mono
Input

Introduction
AT89RFD-08 Hardware User Guide 1-3
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Figure 1-2. Component Side
Figure 1-3. Soldering Side
To complement the evaluation and enable additional development capability, the
AT89RFD-08 Board can be connected to a PC (UART) Atmel in order to use the
AT89C51SND2C as a slave device.

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Figure 1-4. AT89RFD-08 Evaluation with PC
Note: PC software at89rfd-08-MyCom-X_X.exe is available to control AT89RFD-08. Refer to
firmware package readme.txt file.
1.2 AT89RFD-08
Reference
Design Features
The AT89RFD-08 Board provides the following features:
n AT89C51SND2C CTBGA device (3V)
n Power supply flagged by “POWER” LED:
– regulated 3V
– direct powering from external connector
n ISP connector for on-chip ISP
n Serial interfaces:
– 1 RS-232 port
– 1 SPI port
– 1 TWI port
–1USBport
n On-board resources:
– 1 earphone 32 Ohms output (jack connector)
– 1 speaker 8 Ohms output (jack connector)
– 1 SD/MMC card connector
– 2-button keyboard
–2LEDs
n On-board RESET button
n On-board INT0 button
n System clock:
– 16 MHz crystal
n Expansion connector
RS232 Link
AT89RFD-08
PC
RS232 Level
-12/+12V - 3V
Shifter

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Section 2
Using the AT89RFD-08 Board
The AT89RFD-08 Board can be used as a stand-alone board or as a slave board.

Using the AT89RFD-08 Board
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2.1 Block Diagram
Figure 2-1. AT89RFD-08 Board Block Diagram
UARTSPI TWI
ISP
RS232 Link
SPI TWI Network
Speaker
LEDs
Keys
Human
Clocks
Supply
ISP
AT89C51SND2C
Interface
External Power Power
&
Expansion
connector
Human
Interface
Head-Set Audio
Interface
USB

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2.2 Power Supply The power supply input is performed through the SIP2 connector J1 on top of the board.
Figure 2-2. Power supply connector
Once the power is established, the power LED (POWER-ON) is lit.
The on-board power supply circuitry allows various power supply configurations. The
power supply selection is performed using J14 jumper.
Figure 2-3. Power Supply Input Configuration
To prevent malfunction due to insufficient power supply voltage, we assume that an
external brown-out protection or the Master system controls the AT89C51SND2C Reset
PIN.
Note: Refer to Atmel Document ‘External Brown-out Protection for C51 Microcontrollers with
Active High Reset Input’, available on the Atmel web site.
2.2.1 5V to 9V power
Supply J14 shall be configured in the opened position to allow regulation of the power supply to a stable 3V voltage.
Table 2-1. Regulated Power Supply Configuration
The power supply voltage is regulated with on board circuitry. Input voltage on this con-
nector should be included between 5 and 9V. This power supply input is protected
against polarization inversion.
2.2.2 3V power Supply The direct power supply input can be used when J14 jumper is set closed. This input is
used to directly power the board without using the on-board regulator.
Power supply source J14(*) Min Max Unit
External Power Supply opened 5 9 V

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Table 2-2. Power supply configuration
The direct power supply voltage must be adjusted with the power supply source. Input
voltage on this connector must be included between 2.7 and 3.3V.
This power supply input is NOT protected against polarization inversion.
2.2.3 Power Supply
Source Connection For power supply source connection, there is only the need for a 2 points female connector.
Figure 2-4. EXT PWR Female Connector / Cable for 9V Battery
2.2.4 “POWER“ LED The power LED (“PWR”) is always on when power is applied to the board regardless of
power supply configuration.
Figure 2-5. “POWER” LED
Power supply source J14(*) Min Max Unit
External Power Supply closed 2.7 3.3 V
+
-
+
-
+
-
+
-

Using the AT89RFD-08 Board
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2.3 AT89C51SND2C
MP3
microcontroller
The microcontroller area consists of the AT89C51SND2C product along with the follow-
ing items:
n Reset Circuit
n 16 MHz Oscillator
n PLL Filter for USB clock generation
AT89C51SND2C is located in the center of the AT89RFD-08 Reference Design.
Figure 2-6. Processor Placement
2.3.1 Reset
2.3.1.1 Power-on RESET The on-board RC network acts as power-on RESET.
2.3.1.2 RESET Push Button By pressing the RST push button on the board, a warm RESET of the AT89C51SND2C
is performed.
Figure 2-7. RST Push Button

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2.3.2 CPU Clock The AT89C51SND2C microcontroller is clocked by a 16MHz crystal (Y1).
Figure 2-8. Clock Area
2.3.3 PLL Filter Generation of the 48MHz clock frequency is based on an internal PLL with its two-
capacitors and one-resistor filter.

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2.4 Communication
Interfaces
2.4.1 RS-232 The AT89C51SND2C features an on-chip UART interface directly wired to SIP3
connector.
Caution: The AT89RFD-08 Board is supplied without any RS-232 driver/receiver.
Voltage levels on the RS232 interface shall be compliant with AT89C51SND2C DC
characteristics specified in the AT89C51SND2C datasheet.
Figure 2-9. RS-232 SIP3 Connector
2.4.2 USB The AT89RFD-08 Reference Design provides all the required hardware to develop USB
compliant application. This includes:
n a USB connector
n a USB unload jumper (J13) which allows to disconnect the pull-up on D+ and then
simulate an Attach/Detach of the USB cable.
n a USB VBUS detection capability is given by using P3.3 & P3.4 of the microcontroller
Figure 2-10. USB Connector
3V UART

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2.4.3 SPI
The AT89C51SND2C is a micro-controller with an on-chip full duplex SPI interface,
master or slave.
A 6-pin male connector assumes the SPI bus connections.
Figure 2-11. SPI 6-pin Connector
The SPI 6-pin connector also provides to the user Vcc and Gnd.
Figure 2-12. SPI 6-pin Connections
2.4.4 TWI The AT89C51SND2C provides an on-chip TWI interface, master or slave. The SDA and
SCL signals provided for TWI communication are wired to the expansion connector.
SPI Connector front view
pin 1
MOSI
pin 2 SS
pin 3
Gnd
pin 5
pin 4
156234
pin 6
Vcc
MISO
SCK

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2.5 On-board
Resources
2.5.1 LEDs Two leds are provided on the AT89RFD-08 Reference Design. They are connected to
P2_5 and P2_6 and are all free of usage. No dedicated signaling from the
AT89C51SND2C is predefined on these leds.
Figure 2-13. Leds position on the board
2.5.2 2-key Keypad The AT89RFD-08 board embeds a two-key keypad.
Figure 2-14. Keypad location
SELECT push button is connected to KIN0 line of the microcontroller while OK push but-
ton is connected to INT0.
2.5.3 Secure Digital (SD) /
MultiMedia Card
(MMC) Area
The MultiMedia Card area consists of a single slot connector that allows the plug-in of
MMC cards and SD cards.

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2.6 Audio Interfaces
2.6.1 Speaker 8 Ohms
Output The speaker area consists of a stereo jack connector connected to the internal amplifier
output of the microcontroller.
Note: The Power amplifier output is not protected against short circuit: do not unplug the
speaker jack connector while AT89RFD-08 Reference Design is powered to avoid any
hazardous short circuit.
2.6.2 Earphone 32 Ohms
Output The earphone area consists of a 32 Ohms stereo jack.
Figure 2-15. Audio Interfaces

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2.7 Expansion
Connector The expansion area consists of a 20-pin connector.
Figure 2-16. JP1 Expansion Connector
Table 2-3. Expansion Connector
2.7.1 Nand Flash
connection The signals provided on the expansion connector make it possible to connect a Nand Flash memory to the board.
Table 2-4. Recommended Connection for Nand Flash
signal name pin number signal name pin number
VDD 1 P3.2 11
P0.7 2 P3.6 12
P0.6 3 P3.7 13
P0.5 4 P2.0 14
P0.4 5 P2.1 15
P0.3 6 P2.2 16
P0.2 7 P2.3 17
P0.1 8 P2.7 18
P0.0 9 SDA 19
VSS 10 SCL 20
19 1517 13
20 16
18 14
1
2
3
4
5
6
7
8
Expansion connector
pin number Pin name Nand Flash connection
12 P3.6 WR#
13 P3.7 RD#
14 P2.0 CLE
15 P2.1 ALE
16 P2.2 WP#
17 P2.3 RDY/BUSY
18 P2.7 CE#

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2.8 In-System
Programming
2.8.1 ISP Programming FLIP ISP programming interface can be used to program the microcontroller.
Note: FLIP can be downloaded from ATMEL website.
2.8.2 ISP Using Hardware
Conditions Switch SW1 have to be physically pressed on the board in order to enter this mode. This mode has to be used to upgrade the default firmware.
Figure 2-17. ISP switch location
Before connecting the USB cable for ISP, you must enter USB bootloader to establish
the connection with FLIP:
n Press the ISP button.
n Press the RST button while keeping ISP button pressed.
n Release the RST button.
n Release ISP button.
n Connect the USB cable to the AT89RFD-08 Reference Design and to the PC
Microcontroller is now in the ISP mode and is ready to communicate with FLIP.
2.8.3 ISP Using Software
Condition When connected to a PC using a USB cable, the player can be accessed by FLIP soft- ware. To enter by software in the ISP bootloader of the player, press ‘Select’ button
while the USB cable is plugged into the PC (the ISP software condition are checked only
during power ON Reset).
A driver has to be installed the first time (See FLIP installation note). This driver is deliv-
ered with ATMEL FLIP software (current version 2.4.0) available on the Web site. When
connected, a new device will appear in the hardware window of the PC under the "User
interface peripheral" section, named USB_DFU_SND2. See FLIP User's guide for infor-
mation about FLIP execution.

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2.9 Electrical
Parameter
Measurement
The AT89RFD-08 Reference Design is designed to enable easy measurement of elec-
trical parameters on the board. 6 configuration pads can be used either for voltage
measurements or for current measurements.
2.9.1 Configuration Pad A configuration pad configures the AT89RFD-08 Board Demo Board for custom applica-
tion. The configuration is programmable by cutting a specific part (wire) of the
configuration pad. To return to the initial configuration, users must to solder a short
jumper (wrapping wire or solder drop) to replace the cut connection.
Figure 2-18. Configuration Pad
2.9.2 AT89C51SND2C
Configuration Pads There are 6 configuration pads are implemented close to the AT89C51SND2C power supply generator:
n UVDD - USB interface power supply
n PVDD - PLL power supply line
n HSVSS - Audio interface reference voltage
n VDD - Processor digital power supply
n AUDVDD - Processor analog power supply
n AUDVBAT - Audio interface reference voltage
Refer to AT89RFD-08 schematics for configuration pads position.
0.75 mm
O: 0.75 mm
Free Area
Cut Connection
OPEN
CLOSED