參數(shù)資料
型號： AT43USB355E-AU
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM, GREEN, PLASTIC, MS-026ACB, LQFP-64
文件頁數(shù)： 61/115頁
文件大?。?/td> 610K
代理商： AT43USB355E-AU
61
AT43USB355
2603G–USB–04/06
The successive approximation circuitry requires an input clock frequency between 15 kHz and
1 MHz to achieve maximum resolution. If a resolution of 10 bits is required, the input clock fre-
quency to the ADC must be lower than 500 kHz to achieve a higher accuracy. See “ADC
Characteristics” on page 66 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 24.
ADC Timing Diagram, Extended Conversion (Single Conversion Mode)
相關(guān)PDF資料
PDF描述
AT43USB355M-AC Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB355M-AU Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB380 On-The-Go Upgrade of the AT43USB370 USB 2.0 Full-Speed Host/Function Processor
AT45BR3214B 32-MEGABIT DATAFLASH + 4-MEGABIT SRAM STACK MEMORY
AT45BR3214B-C1 32-MEGABIT DATAFLASH + 4-MEGABIT SRAM STACK MEMORY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT43USB355M-AC 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
AT43USB355M-AU 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
AT43USB370 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:USB 2.0 Full-Speed Host/Function Processor
AT43USB370E-AC 功能描述:USB 接口集成電路 USB HOST DEVICE CONTROL - COM TEMP RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
AT43USB380 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:On-The-Go Upgrade of the AT43USB370 USB 2.0 Full-Speed Host/Function Processor
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