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參數(shù)資料
| 型號： | ADUC832BS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, MQFP-52 |
| 文件頁數(shù)： | 18/80頁 |
| 文件大?。?/td> | 1311K |
| 代理商： | ADUC832BS |
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REV. 0
–18–
ADuC832
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/hold, on-chip reference, calibration
features, and ADC. All components in this block are easily
configured via a 3-register SFR interface.
The ADC converter consists of a conventional successive-
approximation converter based around a capacitor DAC. The
converter accepts an analog input range of 0 to V
REF
. A high
precision, low drift, and factory calibrated 2.5 V reference is
provided on-chip. An external reference can be connected as
described later. This external reference can be in the range 1 V
to AV
DD
.
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 repeti-
tive trigger for ADC conversions. The ADC may be configured
to operate in a DMA mode whereby the ADC block continu-
ously 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 ADuC832 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 that
can be hardware calibrated to minimize system errors.
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 V
REF
. 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
V
REF
= 2.5 V. The ideal input/output transfer characteristic for
the 0 to V
REF
range is shown in Figure 7.
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 7. ADC Transfer Function
Typical Operation
Once configured via the ADCCON 1-3 SFRs, the ADC will con-
vert 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 so as to
identify the channel result. The format of the ADC 12-bit result
word is shown in Figure 8.
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 8. ADC Result Format
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| ADUC832BS-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP T/R |
| ADUC832BSZ | 功能描述:IC ADC/DAC 12BIT W/MCU 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:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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