參數(shù)資料
型號： MCHC11F1CFNE2
廠商： Freescale Semiconductor
文件頁數(shù)： 32/158頁
文件大?。?/td> 0K
描述： IC MCU 512 EEPROM 68-PLCC
標(biāo)準(zhǔn)包裝： 18
系列： HC11
核心處理器： HC11
芯體尺寸： 8-位
速度： 2MHz
連通性： SCI，SPI
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 30
程序存儲器類型： ROMless
EEPROM 大?。?/td> 512 x 8
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線）
包裝： 管件
ANALOG-TO-DIGITAL CONVERTER
TECHNICAL DATA
10-3
Figure 10-2 Electrical Model of an A/D Input Pin (Sample Mode)
10.1.2 Analog Converter
Conversion of an analog input selected by the multiplexer occurs in this block. It con-
tains a digital-to-analog capacitor (DAC) array, a comparator, and a successive ap-
proximation register (SAR). Each conversion is a sequence of eight comparison
operations, beginning with the most significant bit (MSB). Each comparison deter-
mines the value of a bit in the successive approximation register.
The DAC array performs two functions. It acts as a sample and hold circuit during the
entire conversion sequence, and provides comparison voltage to the comparator dur-
ing each successive comparison.
The result of each successive comparison is stored in the SAR. When a conversion
sequence is complete, the contents of the SAR are transferred to the appropriate re-
sult register.
A charge pump provides switching voltage to the gates of analog switches in the mul-
tiplexer. Charge pump output must stabilize between 7 and 8 volts, thus a delay of up
to 100
s must be imposed after setting ADPU before the converter can be used. The
charge pump is enabled by the ADPU bit in the OPTION register.
Power is provided to the A/D converter system through the AVDD and AVSS pins.
10.1.3 Digital Control
All A/D converter operations are controlled by bits in register ADCTL. In addition to se-
lecting the analog input to be converted, ADCTL bits indicate conversion status, and
control whether single or continuous conversions are performed. Finally, the ADCTL
bits determine whether conversions are performed on single or multiple channels.
10.1.4 Result Registers
Four 8-bit registers (ADR1–ADR4) store conversion results. Each of these registers
can be accessed by the processor in the CPU. The conversion complete flag (CCF)
DAC
CAPACITANCE
VRL
ANALOG
INPUT
PIN
~ 20 pF
+ ~ 20 V
–
~ 0.7 V
< 2 pF
INPUT
PROTECTION
DEVICE
400 nA
JUNCTION
LEAKAGE
DIFFUSION AND
POLY COUPLER
≤ 4 k
* This analog switch is closed only during the 12-cycle sample time.
*
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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參數(shù)描述
MCHC11F1CFNE2 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MCHC11F1CFNE2R 功能描述:8位微控制器 -MCU 8B MCU 1KRAM 512EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MCHC11F1CFNE3 功能描述:8位微控制器 -MCU 8B MCU 1KRAM 512EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MCHC11F1CFNE3 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MCHC11F1CFNE3R 功能描述:8位微控制器 -MCU 8B MCU 1KRAM 512EE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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