參數(shù)資料
型號： AT43USB353M-AC
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Low Cost Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
中文描述： 8-BIT, MROM, 24 MHz, RISC MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASTIC, MS-026BBC, LQFP-48
文件頁數(shù)： 49/95頁
文件大?。?/td> 568K
代理商： AT43USB353M-AC
49
AT43USB353M
3307B–USB–4/04
The successive approximation circuitry requires an input clock frequency between 15 kHz and
1 MHz to achieve maximum resolution. If a resolution of lower than 10 bits is required, the
input clock frequency to the ADC can be higher than 200 kHz to achieve a higher sampling
rate. See “ADC Characteristics” on page 54 for more details. The ADC module contains a
prescaler, which divides the CK of 2 MHz clock input, to an acceptable ADC clock frequency.
The ADPS[0:2] bits in ADCSR are used to generate a proper ADC clock input frequency from
15.6 kHz to 1.0 MHz. The prescaler starts counting from the moment the ADC is switched on
by setting the ADEN bit in ADCSR. The prescaler keeps running for as long as the ADEN bit is
set and is continuously reset when ADEN is low.
When initiating a conversion by setting the ADSC bit in ADCSR, the conversion starts at the
following rising edge of the ADC clock cycle.
A normal conversion takes 12 ADC clock cycles. In certain situations, the ADC needs more
clock cycles for initialization and to minimize offset errors. Extended conversions take 25 ADC
clock cycles and occur as the first conversion after the ADC is switched on (ADEN in ADCSR
is set).
The actual sample-and-hold takes place 1.5 ADC clock cycles after the start of a conversion.
When a conversion is complete, the result is written to the ADC data registers and ADIF is set.
In Single Conversion Mode, ADSC is cleared simultaneously. The software may then set
ADSC again and a new conversion will be initiated on the first rising ADC clock edge. In Free
Running Mode, a new conversion will be started immediately after the conversion completes,
while ADSC remains high. Using Free Running Mode and an ADC clock frequency of 1 MHz
gives the lowest conversion time with a maximum resolution, 12 μs, equivalent to 83 kSPS.
For a summary of conversion times, see Table 21.
Figure 17.
ADC Timing Diagram, Extended Conversion (Single Conversion Mode)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT43USB355 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset
AT43USB355_02 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB355_06 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB355E-AC 功能描述:8位微控制器 -MCU USB GAME CONTROL w/EMBED HUB-COM TEMP 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
AT43USB355E-AU 功能描述:8位微控制器 -MCU USB GAME CONTROL w/ EMBED HUB 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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