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| 型號(hào)： | MC68HC11G7CFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁(yè)數(shù)： | 17/195頁(yè) |
| 文件大?。?/td> | 1940K |
| 代理商： | MC68HC11G7CFN |
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ANALOG-TO-DIGITAL CONVERTER
9-1
SECTION 9
ANALOG-TO-DIGITAL CONVERTER
The Analog to Digital converter system consists of a single 10-bit successive approximation type
converter and a 16-channel multiplexer. Eight of the channels are connected to pins on the
MC68HC11G5, four are unused and the remaining four channels are dedicated to internal reference
points or test functions. There are eight 10-bit result registers and control logic allows for four or eight
consecutive conversions before stopping or for conversions to continue with the newest conversion
overwriting the oldest result register. Also, the control logic allows conversions to be performed on
a single selected channel, multiple times or consecutively on a selected group of four channels. In
addition, the control logic allows for converting all eight channels and either stopping or converting
continuously.
Two dedicated lines (Vrl and Vrh) are provided for the reference voltage inputs. These pins may be
connected to a separate or isolated power supply to ensure full accuracy of the AD conversion.
The 10-bit A/D converter accepts analog inputs ranging from Vrl to Vrh. Smaller input ranges can
also be obtained by adjusting Vrl and Vrh to the desired upper and lower limits. Conversion is
specified and tested for Vrl = 0 volts and Vrh = 5 volts. The A/D system can be operated with Vrh below
VDD and/or Vrl above VSS as long as Vrh is above Vrl by enough to support the conversions (2.5
to 5.0 volts).
Each set of four conversions takes 144 cycles of the E-clock, provided that E is greater than or equal
to 750 kHz. If E is less than 750 kHz, an internal R-C oscillator, which is nominally 1.5 MHz, must
be used for the A/D conversion clock. When the internal R-C oscillator is being used as the
conversion clock, the conversion complete flag (CCF) must be used to determine when a conversion
sequence has been completed. When using the internal R-C oscillator for A/D conversions the
sample and conversion process runs at the nominal 1.5 MHz rate; however, the conversion results
must be transferred to the MCU result registers synchronously with the MCU E-clock, so conversion
time is limited to a maximum of one channel per E-clock cycle.
Two control bits in the OPTION register control the basic configuration of the A/D system. The A to D
power-up bit (ADPU) allows the system to be disabled, resulting in reduced power consumption
when the A/D system is not being used. Any conversion which is in process when ADPU is written
to zero will be aborted. A delay of typically 100 microseconds is required after turning on the A/D
(by writing ADPU from 0 to 1) for the analog and comparator sections to stabilize. The CSEL bit is
used to select either the internal R-C oscillator or the MCU E-clock as the A/D system clock source.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC11K0 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC11K0CFN2 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:8-Bit Microcontroller |
| MC68HC11K0CFN3 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:8-Bit Microcontroller |
| MC68HC11K0CFN4 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC11K0CFNE3 | 功能描述:8位微控制器 -MCU 8B MCU 768 RAM - EPP 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(chǔ)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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