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单片机编程 PCA9517 Level translating I2C-
The PCA9517 is a CMOS integrated circuit that provides level shifting between lowvoltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus or SMBus applications.While retaining all the operating modes and features of the I2C-bus system during thelevel shifts, it also permits extension of t ...
单片机编程 PCA9555 16bit I2C-bus and SMBu
The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallelInput/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed toenhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvementsinclude higher drive capability, 5 V I/O tolerance, lo ...
单片机编程 RSM232隔离RS-232收发器
RSM232隔离RS-232收发器具备电源隔离、电气隔离、RS-232收发器，有提高系统稳定性，简化设计等诸多优点。完全符合EIA/TIA-232E和ITU-T V.28规格，采用5V电源供电，具有2500VDC的隔离电压，波特率可高达115200bps
单片机编程 DUAL RS-232 DRIVER RECEIVER WI
The TRS232E is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/RS-232-Fvoltage levels from a single 5-V supply. Each receiver converts TIA/RS-232-F inputs to 5-V TTL/CMOS levels.This receiver has a typical threshold of 1.3 V, a typical hysteresis of 0.5 V, and can a ...
单片机编程 DUAL DIGITAL ISOLATORS
The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are orientedin the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic inputand output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier ...
单片机编程 高压双管反激变换器的设计
高压双管反激变换器的设计:介绍一种双管反激的电路拓扑，分析了其工作原理，给出了一些关键技术参数的计算公式，设计并研制成功的30W 380V AC5 0H z/510V DC/+15.1 V DC(1A )、+5.2VDC(2A)辅助开关电源具有功率密度高、变换效率高、可靠性高等优良的综合性能。该变换器在高电压输人情况下有重要的应用价值。【关 键 词 】变 ...
单片机编程 水位监测报警系统原理
摘要：本水位监测报警器使用5V低压直流电源（也可以用3节5号电池代替）就可以对5~15厘米的水位进行监测，用LED显示和数码管显示水位，并可以对不再此范围内的水位发出报警。主要采用CD4066、74LS86、74LS32、CD4511芯片，再加上数码管、蜂鸣器、发光二极管、电阻这些器件组成一个简单而灵敏的监测报警电路，操作简单，接通 ...
单片机编程 同地弹现象的分析和讲解
地弹的形成：芯片内部的地和芯片外的PCB地平面之间不可避免的会有一个小电感。这个小电感正是地弹产生的根源，同时，地弹又是与芯片的负载情况密切相关的。下面结合图介绍一下地弹现象的形成。
简单的构造如上图的一个小“场景”，芯片A为输出芯片，芯片B为接收芯片，输出端和输入端很近。输出芯片内部的CMOS等输入单元简单 ...
单片机编程 波形发生器,含原理图+电路图+源程序
含原理图+电路图+程序的波形发生器:在工作中，我们常常会用到波形发生器，它是使用频度很高的电子仪器。现在的波形发生器都采用单片机来构成。单片机波形发生器是以单片机核心，配相应的外围电路和功能软件，能实现各种波形发生的应用系统，它由硬件部分和软件部分组成，硬件是系统的基础，软件则是在硬件的基础上，对其合 ...
单片机编程 Reading and Writing iButtons v
Abstract: This application note explains the hardware of different types of 1-Wire® interfaces and software examples adapted to this hardware with a focus on serial ports. Depending on the types of iButtons required for a project and the type of computer to be used, the most economical interface ...