Features: Single power supply PCF8591 operating voltage range of 2.5V-6V low standby current via I2C bus serial input / output PCF8591 by 3 hardware address pins addressing PCF8591 I2C bus speed sampling rate decision 4 analog inputs programmable as single-ended or differential input automatic incremental channel selection PCF8591 analog voltage range from VSS to VDD PCF8591 built-track and hold circuit 8-bit successive approximation A / D converter DAC gain realized by an analog output Module Interface Description This module left and right respectively two-way pin external expansion interfaces respectively as follows: DA output interface chip on the left AOUT AINO chip analog input interface 0 AIN1 chip analog input interface 1 AIN2 chip analog input interface 2 AIN3 chip analog input interface 3 The right of the SCL IIC clock interface connected microcontroller IO port SDA IIC digital interface connected to the microcontroller IO port GND module to an external ground VCC Power Interface External 3.3v-5v Module shorting cap instructions Module 3 short cap respectively function as follows: P4: connect to P4 short circuit cap choose the access circuit thermistor P5: connect to P5 short circuit cap select photoresistor access circuit P6: connect to P6 shorting cap select 0-5V adjustable voltage access circuit Specifications: Dimension:3.5 x 2.2 cm Cable length:20 cm Weight:9 g Package weight:19 g Package included: 1 x PCF8591 AD/DA Converter Module Analog 4 x DuPont cables