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參數(shù)資料
| 型號： | ADUC812BSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT MULTICH MCU 52-MQFP |
| 產(chǎn)品培訓模塊： | Process Control |
| 標準包裝： | 1 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設備： | PSM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 34 |
| 程序存儲器容量： | 8KB（8K x 8） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大小： | 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 8x12b，D/A 2x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 52-QFP |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 738 (CN2011-ZH PDF) |
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REV.
ADuC812
–12–
ADC CIRCUIT INFORMATION
General Overview
The ADC conversion block incorporates a fast, 8-channel,
12-bit, single-supply ADC. This block provides the user with
multichannel mux, track-and-hold, on-chip reference, calibra-
tion features, and ADC. All components in this block are easily
configured via a 3-register SFR interface.
The ADC consists of a conventional successive-approximation
converter based around a capacitor DAC. The converter accepts
an analog input range of 0 V to VREF. A high precision, low drift
and factory calibrated 2.5 V reference is provided on-chip. The
internal reference may be overdriven via the external VREF pin.
This external reference can be in the range 2.3 V to AVDD.
Single step or continuous conversion modes can be initiated in
software or alternatively by applying a convert signal to an external
pin. Timer 2 can also be configured to generate a repetitive trigger
for ADC conversions. The ADC may be configured to operate
in a DMA mode whereby the ADC block continuously converts
and captures samples to an external RAM space without any
interaction from the MCU core. This automatic capture facility
can extend through a 16 MByte external Data Memory space.
The ADuC812 is shipped with factory programmed calibration
coefficients that are automatically downloaded to the ADC on
power-up, ensuring optimum ADC performance. The ADC
core contains internal offset and gain calibration registers.
A software calibration routine is provided to allow the user to
overwrite the factory programmed calibration coefficients if
required, thus minimizing the impact of endpoint errors in the
user’s target system.
A voltage output from an on-chip band gap reference propor-
tional to absolute temperature can also be routed through the
front end ADC multiplexer (effectively a ninth ADC channel
input) facilitating a temperature sensor implementation.
ADC Transfer Function
The analog input range for the ADC is 0 V to VREF. For this
range, the designed code transitions occur midway between
successive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs,
5/2 LSBs . . . FS –3/2 LSBs). The output coding is straight
binary with 1 LSB = FS/4096 or 2.5 V/4096 = 0.61 mV when
VREF = 2.5 V. The ideal input/output transfer characteristic for
the 0 to VREF range is shown in Figure 5.
OUTPUT
CODE
111...111
111...110
111...101
111...100
000...011
000...010
000...001
000...000
0V 1LSB
+FS
–1LSB
VOLTAGE INPUT
1LSB =
FS
4096
Figure 5. ADC Transfer Function
Typical Operation
Once configured via the ADCCON 1–3 SFRs (shown on the
following page), the ADC will convert the analog input and
provide an ADC 12-bit result word in the ADCDATAH/L SFRs.
The top four bits of the ADCDATAH SFR will be written
with the channel selection bits to identify the channel result.
The format of the ADC 12-bit result word is shown in Figure 6.
CH–ID
TOP 4 BITS
HIGH 4 BITS OF
ADC RESULT WORD
LOW 8 BITS OF THE
ADC RESULT WORD
ADCDATAH SFR
ADCDATAL SFR
Figure 6. ADC Result Format
F
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| ADUC812BSZ-01 | 制造商:Analog Devices 功能描述:12-BIT ADC WITH EMBEDDED MCU I.C. |
| ADUC812BSZ-REEL | 功能描述:IC MCU FLASH 12BIT ADC 52MQFP RoHS:是 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(shù):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(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)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 |
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