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参数资料
型号： PIC16F872-E/SS
厂商： Microchip Technology
文件页数： 106/167页
文件大小： 0K
描述： IC MCU CMOS 20MHZ 2K FLSH 28SSOP
产品培训模块： Asynchronous Stimulus
标准包装： 47
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-SSOP（0.209"，5.30mm 宽）
包装： 管件
43
8048C–AVR–02/12
ATtiny43U
L, and may not work reliably if other inductance values are used. See “Boost Converter Compo-
nent Values” on page 45.
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-
verter (Load and Line Regulation) VCC vs. Load Current and VBAT Voltage” on page 169.
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
in Table 20-7 on page 162.
The diode is subject to peak currents the same magnitude as the inductor. See “Inductor” on
page 42.
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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相关代理商/技术参数
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
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