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參數資料
| 型號： | ADUC814 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter, Small Package 12-Bit ADC with Embedded Flash MCU |
| 中文描述： | MicroConverter的，小包裝12位ADC，嵌入式閃存MCU |
| 文件頁數： | 62/72頁 |
| 文件大小： | 846K |
| 代理商： | ADUC814 |
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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.
0
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
DD because that would force
DD 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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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADUC814_02 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter, Small Package 12-Bit ADC with Embedded FLASH MCU |
| ADUC814AN | 功能描述:8052 MicroConverter? ADuC8xx Microcontroller IC 8-Bit 16.78MHz 8KB (8K x 8) FLASH 制造商:analog devices inc. 系列:MicroConverter? ADuC8xx 包裝:- 零件狀態:上次購買時間 核心處理器:8052 核心尺寸:8-位 速度:16.78MHz 連接性:I2C，SPI，UART/USART 外設:POR，PSM，溫度傳感器，WDT I/O 數:- 程序存儲容量:8KB（8K x 8） 程序存儲器類型:閃存 EEPROM 容量:640 x 8 RAM 容量:256 x 8 電壓 - 電源（Vcc/Vdd）:2.7 V ~ 5.5 V 數據轉換器:* 振蕩器類型:內部 工作溫度:* 封裝/外殼:- 供應商器件封裝:- 標準包裝:1 |
| ADUC814ARU | 功能描述:IC ADC 12BIT W/FLASH MCU 28TSSOP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設備:欠壓檢測/復位，LED，POR，PWM，WDT 輸入/輸出數:16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
| ADUC814ARU-D2 | 制造商:Analog Devices 功能描述:12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C - Bulk |
| ADUC814ARU-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:12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C - Tape and Reel |
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