參數(shù)資料
型號： PIC16F872-E/SP
廠商： Microchip Technology
文件頁數(shù)： 106/167頁
文件大?。?/td> 0K
描述： IC MCU CMOS 20MHZ 2K FLASH 28DIP
產品培訓模塊： Asynchronous Stimulus
標準包裝： 15
系列： PIC® 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，SPI
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 22
程序存儲器容量： 3.5KB（2K x 14）
程序存儲器類型： 閃存
EEPROM 大小： 64 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 5.5 V
數(shù)據(jù)轉換器： A/D 5x10b
振蕩器型： 外部
工作溫度： -40°C ~ 125°C
封裝/外殼： 28-DIP（0.300"，7.62mm）
包裝： 管件
43
8048C–AVR–02/12
ATtiny43U
L, and may not work reliably if other inductance values are used. See “Boost Converter Compo-
The inductor must be able to tolerate the following input current:
... where
η is the efficiency of the converter at given voltages and load current. See “Boost Con-
The inductor must also be able to tolerate short peak currents. At steady state, i.e. when the
converter has stabilised after a constant load current has been introduced, the peak current is
calculated as follows:
... where D is the duty cycle and T
S the switching period of the boost converter. See “Boost Con-
verter Characteristics” on page 162 for limits. The steady-state duty cycle is calculated as
follows:
Overall efficiency of the boost converter is affected by the series resistance and the core loss of
the inductor.
8.6.2
Diode
It is recommended to use a Schottky diode with forward voltage, V
F, and reverse leakage cur-
rent, I
R, values as low as possible. This is because converter efficiency mainly depends on the
forward voltage of the diode when I
LOAD is at maximum and VBAT is at minimum. It should be
noted that the reverse leakage current easily becomes a dominant factor, especially in Active
Low Current Mode. For reference, see converter current consumption during Low Current Mode
The diode is subject to peak currents the same magnitude as the inductor. See “Inductor” on
It should be noted that reverse leakage current is a highly temperature dependent variable.
8.6.3
Input Capacitors
A voltage drop occurs between the voltage source and inductor L
1 because voltage sources are
not ideal and tracks have a non-zero resistance. The voltage drop is application specific and
depends on the quality of the voltage source, inductor current, track size and track length.
I
IN
V
CC
I
LOAD
×
V
BAT
η
×
--------------------------------
=
I
PEAK
V
BAT
T
S
D
×
L
------------------------------------
=
D
V
CC
V
BAT
-------------
1
2
---
–
I
LOAD
×
=
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相關代理商/技術參數(shù)
參數(shù)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 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 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 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 安裝風格:SMD/SMT
PIC16F872-I/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F872 SDIL28
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