参数资料
型号: AT87C5112
厂商: Atmel Corp.
英文描述: 8-bit Microcontroller with A/D Converter
中文描述: 8位微控制器与A / D转换器
文件页数: 49/97页
文件大小: 1229K
代理商: AT87C5112
49
AT8xC5112
4191B
8051
04/03
Clock Selection
The maximum clock frequency for ADC (CONV_CK for Conversion Clock) is defined in
the AC characteristics section. A prescaler is featured (ADCCLK) to generate the
CONV_CK clock from the oscillator frequency.
Figure 21.
A/D Converter Clock
The conversion frequency CONV_CK is derived from the oscillator frequency with the
following formulas :
F
CkAdc
= F
OscOut
/(512 - 2*CKRL) , if X2=0
= F
OscOut
, if X2=1
and
F
CONV_CK
= F
CkAdc
/(2*PRS), if PRS > 0
F
CONV_CK
= F
CkAdc
/256, if PRS = 0
Some examples can be found in the table below:
ADC Standby Mode
When the ADC is not used, it is possible to set it in standby mode by clearing bit ADEN
in ADCON register.
In this mode the power dissipation is about 1μW.
Voltage Reference
The Vref pin is used to enter the voltage reference for the A/D conversion.
Best accuracy is obtained with 0.9 Vcc < Vref < Vcc.
IT ADC Management
An interrupt end-of-conversion will occur when the bit ADEOC is activated and the bit
EADC is set. To re-arm the interrupt the bit ADEOC must be cleared by software.
Figure 22.
ADC Interrupt Structure
Prescaler ADCLK
A/D
Converter
CONV_CK
CKADC
/2
F
OscOut
MHz
X2
CKRL
F
CkAdc
Mhz
ADCLK
F
CONV_CK
khz
Conversion
time
μ
s
16
0
FF
8
12
333
33
16
1
NA
16
32
250
44
ADEOC
ADCON.2
EADC
IE1.1
ADCI
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AT87C51RB2 制造商:IRF 制造商全称:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT87C51RB2-3CSUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-3CSUM 功能描述:8位微控制器 -MCU 32KB SCMOS 3/2 .5 OTP RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLRUM 功能描述:8位微控制器 -MCU 32KB 2.5u RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLTUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT