参数资料
型号: PIC16F872-E/SO
厂商: Microchip Technology
文件页数: 101/167页
文件大小: 0K
描述: IC MCU CMOS 20MHZ 2K FLSH 28SOIC
产品培训模块: Asynchronous Stimulus
标准包装: 27
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
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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参数描述
PIC16F872-I/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16F872-I/SO 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F872 SOIC28
PIC16F872-I/SOG 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O Lead Free Package 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
PIC16F872-I/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16F872-I/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F872 SDIL28