MS (see Figure 8-5) the converter goes from A" />
參數(shù)資料
型號： ATTINY43U-SU
廠商： Atmel
文件頁數(shù)： 92/158頁
文件大?。?/td> 0K
描述： MCU AVR 4K FLASH 8MHZ 20-SOIC
產(chǎn)品培訓(xùn)模塊： ATtiny43U Overview
MCU Product Line Introduction
tinyAVR Introduction
標(biāo)準(zhǔn)包裝： 37
系列： AVR® ATtiny
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： USI
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，溫度傳感器，WDT
輸入/輸出數(shù)： 16
程序存儲器容量： 4KB（2K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
產(chǎn)品目錄頁面： 613 (CN2011-ZH PDF)
配用： ATSTK600-TINYX3U-ND - STK600 SOCKET/ADAPTER TINYX3U
39
8048C–AVR–02/12
ATtiny43U
As current consumption goes below I
MS (see Figure 8-5) the converter goes from Active Regu-
lated Mode to Active Low Current Mode. After this, the more the load current is decreased the
longer the discharge time of the output capacitor, i.e. the time when the converter is not switch-
ing, will be. Similarly, the charge time, i.e. the time when the converter is switching, will be
shorter. Note that in Active Low Current Mode only the last part of the rising/switching slope is
changed.
Charge time can be minimised by forcing the device into Full Duty Cycle mode of operation (see
When load current increases above I
MS the converter goes back to Active Regulated Mode.
8.3
Output Voltage versus Load Current
The output voltage of the boost converter depends on the amount of load and method of duty
cycle control.
In Active Mode the boost converter operates in one of two sub-modes called (Active) Regulated
Mode and (Active) Low Current Mode. In Regulated Mode the emphasis is on maintaining a sta-
ble output voltage, while in Low Current Mode the emphasis is on minimising current
consumption. The converter always enters Active Regulated Mode at first and switches to Low
Current Mode automatically when required but it is possible to design the application such that
the converter always stays in Active Regulated Mode.
The boost converter goes from Active Regulated Mode to Active Low Current Mode when the
duty cycle reaches its minimum and the output voltage reaches its maximum. At this point the
converter stops switching and the output voltage starts to fall. The converter starts switching
again when the output voltage has fallen to the low limit defined for Low Current Mode. If load
current increases sufficiently the converter will go back from Active Low Current Mode to Active
Regulated Mode. See Figure 20-4 on page 163.
The boost converter goes back to Start Mode if output voltage drops below V
BOOST, and starts
over from Stop Mode if input voltage drops below V
STOP, or when instructed by firmware to do
so.
8.3.1
Active Regulated Mode
This is the default method of operation in Active Mode. The converter will remain in this mode
provided that load current is sufficiently high. See “Active Low Current Mode” on page 40.
In this mode of operation the output voltage is constantly regulated. This means a stable output
voltage with a low amplitude ripple. See Figure 8-6 and Table 20-7 on page 162.
The firmware can instruct the converter to leave this mode and enter Stop Mode. See “Software
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ATTINY43U-SUR 功能描述:8位微控制器 -MCU 4KB FLSH 64B EE 256B SRAM-8MHz, IND 0.9V 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
ATTINY44 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
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ATTINY441-MMH 制造商:Atmel Corporation 功能描述:16MHZ, 3X3MM, 20 VQFN, IND. GRADE, GREEN - Bulk 制造商:Atmel Corporation 功能描述:IC MCU 8BIT 4KB FLASH 20VQFN
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