โมดูล A/D D/A Converter Module (PCF8591)

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โมดูล A/D, D/A Converter Module (PCF8591)

โมดูลแปลง Analog เป็น Digital และ แปลง Digital เป็น Analog บนบอร์ดมี Photoresistor วัดความเข้มแสง , Termistor วัดอุณหภูมิ และ Potentiometer สำหรับปรับ Volt input ด้วย

A PCF8591 AD / DA chip introduced
    PCF8591 is a monolithic , single supply, low power ,8-bit CMOS data acquisition device . PCF8591 has four analog inputs, one analog output and a serial I2C bus interface . PCF8591 the three address pins A0, A1 and A2 can be used for programming the hardware address , allowing access to the same I2C- bus PCF8591 8 devices without the need for additional hardware. PCF8591 device on the input and output address, control and data signals are bi-directional two-wire I2C-bus for transmission in a serial manner .
 
PCF8591 key performance indicators:
  •   single power supply
  •   PCF8591 operating voltage range of 2.5V-6V
  •   Low Standby Current
  •   via I2C -bus serial input / output
  •   PCF8591 through 3 hardware address pins addressing
  •   PCF8591 I2C bus speed sampling rate decision
  •   4 analog inputs programmable as single-ended or differential inputs
  •   auto increment channel selection
  •   PCF8591 analog voltage range from VSS to VDD
  •   PCF8591 built-in track and hold circuit
  •   8-bit successive approximation A / D converter
  •  Through an analog output of the DAC gain
 
Two baby description
  •  A module chip PCF8951
  •  2 module supports an external 4-channel voltage input capture ( voltage input range 0-5v)
  •  3 module integration photoresistor , you can capture the ambient light intensity through the AD precise values
  •  4 module integrated thermistor temperature by exact numerical AD acquisition
  •  5 module integrates a channel 0-5V voltage input capture ( via the blue potentiometer adjustment input voltage )
  •  6 module with power indicator ( the module after power indicator lights )
  •  7 module with DA output indicator , when the module DA output interface voltage reaches a certain value , the board will be lit DA output indicator, the higher the voltage , the light intensity is more obvious ;
  •  8 Module PCB size : 3.6cm * 2.3cm
  •  9 standard double panel , thickness 1.6mm, nice layout , surrounded by a through hole , aperture : 3mm, convenient fixed
 
Three module interface description
This module expansion outside the left and right , respectively, 2-way pin header , respectively, as follows:
  DA output interface chip left AOUT
       AINO chip analog inputs 0
       AIN1 chip analog inputs 1
       AIN2 chip analog inputs 2
       AIN3 chip analog input interface 3
  Right SCL IIC clock interface connected microcontroller IO port
       SDA IIC digital interface connected microcontroller IO port
       GND Module to external ground
       VCC Power Interface External 3.3v-5v
 
Four modules use red short cap
  There are three red module shorted cap, respectively function as follows :
  •   Connect the shorting cap P4 P4 , select thermistor access circuit
  •   Connect the shorting cap P5 P5 , select photoresistor access circuit
  •   Connect the shorting cap P6 P6 , select 0-5V Adjustable voltage access circuit

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