外文翻译--基于单片机的信号发生器的设计适用于毕业论文外文翻译中英文对照

外文翻译--基于单片机的信号发生器的设计适用于毕业论文外文翻译中英文对照内容摘要：

o +15) V logic level inputs patible with TTL. Be seen from Figure 31, the DAC0832 in two latches the first latch is called the input register, it allows the latched signal as ILE, the second latch called the DAC register, it the latch signal is also referred to as a channel control signal / XFER. Figure 23, when the ILE is high, the chip select signal / CS and the write signal / WR1 is low, the input register control signal, in which case, the output of the input register with the input changes. Thereafter, when the high / WR1 low, the control signals bee low at this time, the data is latched into the input register, input register output is no longer with the change of the external data second stage latch transfer control signal / XFER and write signal / WR2 at the same time is low, the two latch control signal is high, the output of the 8bit DAC register with the input, then when / WR2 from low, the control signal goes low, so the input register is latched into the DAC register.Figure 23 the rest of the pin function defined as follows:(DI7 ~ DI0 in: 1) 8bit data input, DI7 highest.(2) IOUT1: analog current output terminal 1, when the data in the DAC register are all 1, the maximum output current, the DAC register data are all 0, the output current is 0.(3) IOUT2​​: analog current output, IOUT2 ​​and IOUT1 and is a constant, that is IOUT1 the + IOUT2 ​​= constant.(4) the RFB: feedback resistor terminal of DAC0832 internal feedback resistor, RFBside can be directly connected to an external op amp39。 s output, this is equivalent to a feedback resistor connected to the op amp output and input .(5) VREF: Reference voltage input, this end can be connected to a positive voltage can be accessed by a negative voltage, which determines the 0255 digital transforming the amplitude of the analog voltage values​​, VREF range (+10 10) V. Resistor network connected to the the VREF side and D / A internal Tshaped.(6) Vcc: chip supply voltage range of (+5 15) V. op amp circuit Figure 24, R1 is coupled to resistors, R2, R3, resistor voltage divider feedback. R2 and R1, the voltage ratio of 1:2, for OUT2 voltage of5v ~ 0v in the second op amp in the make5v ~ 0v between the voltage change5v to 5v, the first op amp convert the amount of voltage values did not increase or decrease the 1v, the second stage op amp voltage decrease or increase of 2v. LED display interface circuit Commonly used in LED display LED status display (monly known as lightemitting diode) LED sevensegment display (monly known as the digital control and LED 16 segment display, LED display two states, for the system。 digital tube for digital display。 LED 16 segment display, for the character display)A. Digital control structure Digital tube consists of eight lightemitting diode (hereinafter referred to as fields), different binations can be used to display the numbers 09. Characters AF and the decimal point . Digital tube is divided into two mon cathode and mon anode structure.Digital pipe works Total anode 8 digital tube light emitting diode anode (diode positive terminal) connected together. Usually mon anode connected high a general power supply when a cathode connected to low, the digital tube conduction and light. A total of eight lightemitting diode digital cathode tube cathode (diode negative terminal) connected together. Public cathode connected to low (ground) when an anode connected to high, the digital tube light. Waveform Generation Principle and module design1 First, the digital value of the stored waveform memory array tosin。 52 microcontroller to read the value in the array into the D / A converter。 3, D / A converter input digital value is converted to analog output。 4, the D / A analog output electric current through the op amp to convert the voltage waveforms generated by the microcontroller programming method through the DA converter module DAC0832 output into the filter wave amplification. Schematic 26 as follows: the design of the display module LCD 1602 display the output waveform, frequency, the circuit diagram. As shown in Figure 27, the 1602 data of the eight termination microcontroller P1 port, its three can end RS, RW, E, res。