The PCF8591 is a 8-bit CMOS data acquisition device. The PCF8591 has the four analog inputs, one analog output and a serial I2C bus interface. PCF8591 has three address pins A0, A1 and A2 that can be used to set the I2C hardware address, 8 PCF8591 could be on the same I2C bus, without the need for additional hardware. On the PCF8591 control and data signals are transmitted in serial fashion via the two-wire bidirectional I2C bus.
PCF8591 IC 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 decided
4 analog inputs programmable single-ended or differential input
Automatic incremental channel selection
PCF8591 analog voltage range from VSS to VDD
PCF8591 built-in track-and-hold circuit
8-bit successive approximation A / D converter
1 analog output DAC gain
Module Features
Module uses PCF8951
Module supports external voltage input of the 4-way acquisition (voltage input range of 0-5v)
The module has an integrated photoresistor connected to one A - D port allowing you access to the precise value of the ambient light falling on the LDR. Disconnect it by removing one of the on board jumpers.
The module has a thermistor to measure the precise value of the ambient temperature, remove a jumper to disable.
The module also has 1 variable resistor 0-5V volts can be sent to one of the A - D pins (the blue potentiometer adjusts the voltage)
Power indicator LED
1 LED connected to the D- A port pin (Digital to Analog pin)
Module PCB size: 3.6cm * 2.3cm
Standard double panel, thickness 1.6mm, 4 x 3mm holes
Module interface specification:
One end of the board
AOUT chip DA output interface
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 other end
SCL – IIC clock interface connected to microcontroller IO port
SDA – IIC digital interface connected to microcontroller IO port
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