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| 型號： | ADUC814BRU |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 59/72頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT W/FLASH MCU 28TSSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 16.78MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | POR，PSM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 17 |
| 程序存儲(chǔ)器容量： | 8KB（8K x 8） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 640 x 8 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 6x12b; D/A 2x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 管件 |
| 配用： | EVAL-ADUC814QSZ-ND - KIT DEV FOR ADUC814 MICROCONVRTR |
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ADuC814
Rev. A | Page 62 of 72
DGND
AGND
GND
PLACE DIGITAL
COMPONENTS
HERE
PLACE DIGITAL
COMPONENTS
HERE
PLACE DIGITAL
COMPONENTS
HERE
PLACE ANALOG
COMPONENTS
HERE
PLACE ANALOG
COMPONENTS
HERE
PLACE ANALOG
COMPONENTS
HERE
DGND
a.
AGND
b.
c.
02748-A
-064
Figure 58. System Grounding Schemes
In all of these scenarios, and in more complicated real-life appli-
cations, keep in mind the flow of current from the supplies and
back to ground. Make sure the return paths for all currents are
as close as possible to the paths the currents took to reach their
destinations. For example, do not put power components on the
return currents from DVDD to flow through AGND. Also, try to
avoid digital currents flowing under analog circuitry, which
could happen if a noisy digital chip is placed on the left half of
the board in Figure 58c. Whenever possible, avoid large
discontinuities in the ground plane(s) (such as are formed by a
long trace on the same layer), because they force return signals
to travel a longer path. And of course, make all connections to
the ground plane directly, with little or no trace separating the
pin from its via to ground.
If the user plans to connect fast logic signals (rise/fall time
< 5 ns) to any of the ADuC814’s digital inputs, add a series
resistor to each relevant line to keep rise and fall times longer
than 5 ns at the ADuC814 input pins. A value of 100 or 200
is usually sufficient to prevent high speed signals from coupling
capacitively into the ADuC814 and affecting the accuracy of
ADC conversions.
OTHER HARDWARE CONSIDERATIONS
To facilitate in-circuit programming, in-circuit debug, and
emulation options, users should implement some simple
connection points in their hardware. A typical ADuC814
connection diagram is shown in Figure 59.
In-Circuit Serial Download Access
Nearly all ADuC814 designs will want to take advantage of the
in-circuit reprogrammability of the chip. This is accomplished
by a connection from the ADuC814’s UART to a PC, which
requires an external RS-232 chip for level translation. If users
would rather not design an RS-232 chip onto a board, refer to
the Application Note uC006, A 4-Wire UART-to-PC Interface
(available at www.analog.com/microconverter) for a simple
(and zero-cost-per-board) method of gaining in-circuit serial
download access to the ADuC814.
In addition to the basic UART connections, users also need a
way to trigger the chip into download mode. This is accom-
plished via a 1 k pull-up resistor that can be jumpered onto
the DLOAD pin. To get the ADuC814 into download mode,
simply connect this jumper and power-cycle the device (or
manually reset the device, if a manual reset button is available),
and it will be ready to receive a new program serially. To enable
the device to enter normal mode (and run the program) when-
ever power is cycled or RESET is toggled, the DLOAD pin must
be pulled low through a 1 k resistor.
Embedded Serial Port Debugger
From a hardware perspective, entry to serial port debug mode is
identical to the serial download entry sequence described in the
preceding section. In fact, both serial download and serial port
debug modes can be thought of as essentially one mode of
operation used in two different ways. Note that the serial port
debugger is fully contained on the ADuC814 device, unlike
ROM monitor type debuggers.
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| ADUC814BRU-REEL | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 8KB Flash 3V/5V 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:MCU 8BIT CISC 8KB FLASH 3.3V/5V 28TSSOP - Tape and Reel 制造商:Analog Devices Inc. 功能描述:8-bit Microcontrollers - MCU 12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C |
| ADUC814BRU-REEL7 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 8KB Flash 3V/5V 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:MCU 8BIT CISC 8KB FLASH 3.3V/5V 28TSSOP - Tape and Reel 制造商:Analog Devices Inc. 功能描述:8-bit Microcontrollers - MCU 12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C |
| ADUC814BRUZ | 功能描述:IC ADC 12BIT W/FLASH MCU 28TSSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 產(chǎn)品培訓(xùn)模塊:MCU Product Line Introduction XMEGA Introduction AVR XMEGA USB Connectivity 標(biāo)準(zhǔn)包裝:90 系列:AVR® XMEGA 核心處理器:AVR 芯體尺寸:8/16-位 速度:32MHz 連通性:I²C，IrDA，SPI，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，DMA，POR，PWM，WDT 輸入/輸出數(shù):50 程序存儲(chǔ)器容量:192KB（96K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:16K x 8 電壓 - 電源 (Vcc/Vdd):1.6 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 16x12b; D/A 2x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:64-TQFP 包裝:托盤 配用:ATSTK600-RC14-ND - STK600 SOCKET/ADAPTER 64TQFPATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATAVRISP2-ND - PROGRAMMER AVR IN SYSTEM |
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