PCF8591 AD/DA chip introduction
PCF8591 is a single chip integrated, single power supply, low power consumption, 8-bit CMOS data acquisition device.PCF8591 has four analog inputs, one analog output, and one serial I2C bus interface.The three address pins A0, A1, and A2 of PCF8591 can be used for hardware address programming, allowing access to eight PCF8591 devices on the same I2C bus without additional hardware.The input and output address, control and data signals on the PCF8591 device are transmitted serially through a two-wire bidirectional I2C bus.
Main performance indicators of PCF8591:
Br single power supply
Process PCF8591 operating voltage range 2.5v -6V
Shorter standby current
Matlab serial input/output through the I2C bus
Matlab PCF8591 addresses through three hardware address pins
The sampling rate of matlab PCF8591 is determined by the I2C bus rate
The four analog inputs are programmable to be single - end or differential inputs
Creeping automatic incremental channel selection
The simulated voltage range of matlab PCF8591 is from VSS to VDD
Matlab PCF8591 has a built-in tracking and holding circuit
Shorter 8-bit approximates A/D converter successively
The dbac gain is realized through the simulated output of 1 circuit
Description of two babies
The module chip adopts PCF8951
2 module supports external 4-channel voltage input acquisition (voltage input range 0-5v)
The 3 module integrates photosensitive resistance, and can collect accurate value of ambient light intensity through AD
4 module integrated thermistor, can collect environment temperature exact value through AD
5 module integration 1 circuit 0-5v voltage input acquisition (adjust input voltage through blue potentiometer)
6 module with power indicator light (after power supply to module, the indicator light will be on)
Module 7 has DA output indicator light. When the output interface volt