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巧记电路原理图的英文缩写

  • 分类:公司动态
  • 作者:小编
  • 来源:
  • 发布时间:2024-11-28 23:32:31
  • 访问量:

【概要描述】     有些时候简称为R或者全称RESET■■。也有些时候标注RST_N,表示Reset信号是拉

巧记电路原理图的英文缩写

【概要描述】     有些时候简称为R或者全称RESET■■。也有些时候标注RST_N,表示Reset信号是拉

  • 分类:公司动态
  • 作者:小编
  • 来源:
  • 发布时间:2024-11-28 23:32:31
  • 访问量:

  

巧记电路原理图的英文缩写

  有些时候简称为R或者全称RESET★◆■■◆。也有些时候标注RST_N,表示Reset信号是拉低生效★◆★■■。

  用在设备上通常用作外部直流输入接口,而不是指供电方式或者供电电压什么的。例如VCC_DC_IN的含义,就是外部DC接口供电◆◆■★。

  中断的意思◆■■,就像你正睡觉的时候有人把你摇醒了◆■◆■,或者你正看电影的时候女朋友来了个电话,在处理器中非常常用的一个功能,与■★★“查询”功能相对应。

  例如I_REF,V_REF等。参考电流、参考电压◆◆★◆,常用在稳压电路★■■◆★、ADC、DAC中。

  这个概念用在串口(UART)上是最多的■■◆■■★,一根线负责发送,一根线负责接收。这里要特别注意,一台设备的发送,对应另一台设备就是接收,TX要接到RX上去。如果TX接TX,两个都发送,就收不到数据了。

  用于差分信号线★■。现在除了DDR和SDIO之外,其他很少有并行数据传输接口了。USB★★★★■、LAN、MIPI的LCD和Camera、SATA等等,高速数据总线几乎都变成了串行传输数据了。

  串行信号线速度很高,随便就上GHz,电压很低只有几百毫伏,因此很容易扰,要做成差分信号,即用两根线传一个数据,一个传正的一个传负的。传到另外一边,数据相减■■★■,干扰信号被减掉◆◆,数据信号负负得正被加倍。

  断电不一定非要把芯片的外部供电给断掉,如果芯片自带PD脚,直接拉一下PD脚■■,也相当于断电了。摄像头上会用到这根线组供电,要控制三个电源直接断电,不如直接操作PD脚来的简单◆■◆。(在USB Type-C接口中有一个Power Delivery也叫PD,跟这个完全不一样■■◆,不要看错了。)

  时钟线容易干扰别人也容易被别人干扰,Layout的时候需要保护好★★★■。对于数字传输总线的时钟,一般都标称为xxx_xCLK,如SPI_CLK、SDIO_CLK◆◆★★■、I2S_MCLK(Main Clock)等■◆◆。对于系统时钟★◆■◆◆■,往往会用标注频率。如SYS_26M■■★★、32K等。标了数字而不标CLK三个字★★◆■■,也是无所谓的,因为只有时钟才会这么标★■◆★◆。

  十几年前的的手机芯片只有通信功能★★■★,没有这么强大的AP(跑系统的CPU)◆■★■◆◆,手机里的主芯片都叫做Baseband基带芯片。后来手机性能强大了★■★★◆,还是有很多老工程师习惯把主芯片叫做BB,而不是叫CPU■■。

  对于RESET_N这样的信号来讲,只起到重点标注的作用,表示这个RESET信号是拉低才生效的。大部分设备都是低有效的RESET,偶尔会有一些设备拉高RESET。

  用法同数据线。主要用在DDR等地址和数据分开的传输接口上。其他的接口,慢的像I2C、SPI,快的像MIPI★◆◆★★、RJ45等,都是地址和数据放在一组线上传输的◆★◆■★,就没有地址线了。

  PWM:脉宽调制,通过在一根输出信号线上输出不同占空比的脉冲信号达到传递能量/信息的目的,比如可以控制电机的转速、加一个RC构成DAC电路、开关稳压控制器中也常通过PWM来达到稳压的目的。

  使芯片能够工作。要用的时候◆◆◆★,就打开EN脚■■◆★,不用的时候就关闭◆★◆◆■。有些芯片是高电平使能,有些是低电平使能,要看元器件的数据手册才知。

  有些时候如喇叭的信号是通过差分来传输的■◆■■■,就是SPK_L_N★★、SPK_L_P这样的标识。

  芯片的选择。通常用于发数据的时候选择哪个芯片接收。例如一根SPI总线可以挂载多个设备,DDR总线上也会挂载多颗DDR内存芯片,此时就需要CS来控制把数据发给哪个设备,一般为低电平有效,也就是/CS表示◆★★。

  如下图★★★◆◆★,某2.1声道智能音箱音频输出(喇叭连接器端)。TAS5751是音频功放■◆,HF是高频High frequency(2.1音响有专门的低频输出)。P和N用 和-代替。

  例如单片机◆◆★,接口通用化比较高,大部分都是GPIO口◆◆◆★★,做什么用都行■◆★★★■,就不在管脚上标那么清楚了■■★★■,直接用P1,P2,P1_3这样的方式来标明。P多少就是第多少个GPIO。P1_3就是第1组的第3个GPIO★■■★◆。(不同组的GPIO可能电压域不一样)

  升压、降压电路上都会有反馈信号,意义和Reference是类似的■■◆,芯片根据外部采集来的电压高低,动态调整输出。外部电压偏低了,就加大输出■◆◆,外部电压偏高了,就减小输出◆◆■★。

  为了防止出错,可以标注为◆★■■★◆:UART1_MRST、UART1_MTSR◆■。Master RX Slave TX的意思。Master就是主控芯片,Slave就是从设备■■。TX、RX很容易标错的■◆◆,尤其是原理图有几十页的情况下。

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