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Atmel AT89RFD-08 User Manual Download Page 28

Using the AT89RFD-08 Board

AT89RFD-08 Hardware User Guide

2-25

4382E–MP3–05/06

9. What about power through I/O pins as RxD, TxD if AT8xC51SND2C is not
powered?

The AT8xC51SND2C can have an unexpected behavior if Powered through IOs:

- consumption.

- microcontroller can execute the code.

Solutions:

n Use AT8xC51SND2C Reset Pin (no code execution but extra consumption).

n Use AT8xC51SND2C in power down mode (Power supply needed).

AT8xC51SND2C shall not be powered through I/O pins if there is no power supply.

AT8xC51SND2C

NandFlash

LDO

VDD

VDD

VDD

Enable

RST

WP/

SND2_RST

WP/

Capacitors

VSS

R=150 Ohm

POWER ON Sequence

LDO_EN

VDD

SND2_RST

WP/

POWER OFF Sequence

Summary of Contents for AT89RFD-08

Page 1: ...AT89RFD 08 Reference Design Hardware User Guide...

Page 2: ...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...

Page 3: ...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 Sec...

Page 4: ...gn 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 sta...

Page 5: ...Hardware User Guide 4382E MP3 05 06 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 LED...

Page 6: ...382E MP3 05 06 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...

Page 7: ...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...

Page 8: ...AT89RFD 08 Hardware User Guide 2 5 4382E MP3 05 06 Section 2 Using the AT89RFD 08 Board The AT89RFD 08 Board can be used as a stand alone board or as a slave board...

Page 9: ...E MP3 05 06 2 1 Block Diagram Figure 2 1 AT89RFD 08 Board Block Diagram UART SPI TWI ISP RS232 Link SPI TWI Network Speaker LEDs Keys Human Clocks Supply ISP AT89C51SND2C Interface External Power Powe...

Page 10: ...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...

Page 11: ...ower 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...

Page 12: ...ms 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...

Page 13: ...uide 4382E MP3 05 06 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 int...

Page 14: ...e 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 h...

Page 15: ...he 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 TW...

Page 16: ...g 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 butto...

Page 17: ...ctor 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...

Page 18: ...or 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 1...

Page 19: ...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 S...

Page 20: ...ific 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...

Page 21: ...3 1 Voltage Voltage measurement shall be done with a CLOSED configuration pad Figure 2 19 Voltage Measurement 2 9 3 2 Current Current measurement shall be done cutting the configuration pad and conne...

Page 22: ...er supplies shall have decoupling capacitors Power Supply Implementation n All power sources wires can carry up to 500 mA n All Power supply types must have at least one test point access on the Botto...

Page 23: ...be two UVSS lines on each side of this two lines USB serial resistors 27 ohms on D and D lines must be placed as close as possible of the processor 2 10 3 Audio Resistance on the power supply lines an...

Page 24: ...at the expense of a THD degraded some dB and higher power dissipation 25 raised with a 20 lower load impedance Refer to product datasheet plot maximum dissipated power versus power supply and impedanc...

Page 25: ...ected to battery 3 6V is it possible Yes it is possible but AT8xC51SND2C power supply shall be at least 3V for USB oper ation to comply USB specification In this case you can use the power supply sche...

Page 26: ...f insufficient power supply voltage AT89C51SND2C voltage supply shall be monitored by a voltage supervisor During USB operation AT89C51SND2C voltage supply shall be 3 0V to 3 6V to comply USB specific...

Page 27: ...off n VDD to 1V AT8xC51SND2C have to be maintained under reset to prevent any flash corruptions Flash version only and hazardous behavior n 1V to 0V don t care To verify the effectiveness of the solu...

Page 28: ...gh IOs consumption microcontroller can execute the code Solutions n Use AT8xC51SND2C Reset Pin no code execution but extra consumption n Use AT8xC51SND2C in power down mode Power supply needed AT8xC51...

Page 29: ...er 100nF are recommended Should be reduced down to 10nF for a vocal range usage 300 3000 Hz bandwidth n AUDVREF capacitor decoupling capacitor of the reference of the DAC 10uF is mandatory to insure a...

Page 30: ...HPP and HPN 10 K ohms n Between HPP and LPHN 10 K ohms 15 What will be the AT8xC51SND2C power supply during USB mass storage mode The AT8xC51SND2C power supply VDD UVDD PVDD shall be 3 V to comply US...

Page 31: ...he Headset amp should be loaded with a 32 Ohms resistor headphone specification Coupling capacitor value 100uF Test equipment AUDIO PRECISION system Two 2322 for example or FFT Bandwidth 20KHz A weigh...

Page 32: ...esponse and hence its clock frequency This frequency is 0 4535 Fs Fs the sampling frequency i e 44 1KHz 20 Confirm the isolation between L channel and R channel of headset line The specification is 80...

Page 33: ...Using the AT89RFD 08 Board 2 30 AT89RFD 08 Hardware User Guide 4382E MP3 05 06...

Page 34: ...100 x H 27 mm Weight 70 g n Operating Conditions Voltage Supply 2 7V 3 3V or 5V 9V n Connections RS 232C Connector 3 pin SIP connector RS 232C Communications Maximum Speed 500 kbps SPI Connector 6 pin...

Page 35: ...clude the following information n Which target C51 device is used complete part number n Target voltage and speed n Clock source and fuse setting of the C51 n Programming method ISP or specific Boot L...

Page 36: ...trademarks and Everywhere You Are are the trademarks of Atmel Corporation or its subsidiaries Other terms and product names may be trademarks of others Atmel Corporation Atmel Operations 2325 Orchard...

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