Product Introduction
Introduction to PCF8591 AD/DA chip
PCF8591 is a single-chip integrated, separately powered, low-power, 8-bit CMOS data acquisition device. PCF8591 has 4 analog inputs, 1 analog output, and 1 serial I2C bus interface. The three address pins A0 of PCF8591, A1 and A2 can be used for hardware address programming, allowing 8 PCF8591 devices to be connected on the same I2C bus without the need for additional hardware. The address, control, and data signals input and output on the PCF8591 device are transmitted in a serial manner through a two-wire bidirectional I2C bus.
Main performance indicators of PCF8591:
★ Single power supply
★ The operating voltage range of PCF8591 is 2.5V-6V
★ Low standby current
★ Serial input/output through I2C bus
★ PCF8591 is addressed through three hardware address pins
★ The sampling rate of PCF8591 is determined by the I2C bus rate
★ 4 analog inputs can be programmed as single ended or differential inputs
★ Automatic incremental channel selection
★ The analog voltage range of PCF8591 is from VSS to VDD
★ PCF8591 built-in tracking and holding circuit
★ 8-bit successive approximation A/D converter
★ Realize DAC gain through 1 analog output
Product Descriptions
1.The module chip adopts PCF8951
2 modules support external 4-channel voltage input acquisition (voltage input range 0-5V)
3 modules integrated with photoresistors, capable of collecting accurate values of ambient light intensity through AD
4 modules integrated with thermistor, which can collect accurate environmental temperature values through AD
5-module integrated 1-channel 0-5V voltage input acquisition (adjust input voltage through blue potentiometer)
6.Module 6 with power indicator light (the indicator light will light up when the module is powered on)
7.Module is equipped with a DA output indicator light. When the voltage of the module's DA output interface reaches a certain value, the DA output indicator light on the board will light up. The higher the voltage, the more obvious the brightness of the indicator light;
8.module PCB size: 3.6cm * 2.3cm
9.standard double-sided panel, with a thickness of 1.6mm and a beautiful and elegant layout. There are through holes around the perimeter, with a diameter of 3mm, for easy fixation
Product Interface Description
The left and right sides of this module are respectively expanded with 2 pin layout interfaces, as described below:
Left 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
Connect the SCL IIC clock interface on the right to the microcontroller IO port
SDA IIC digital interface connected to microcontroller IO port
GND module external grounding
VCC power interface external 3.3v-5V
Product Instructions for using
Instructions for using the four module red short-circuit cap
The module has three red short-circuit caps, which function as follows:
Connect P4 to the short-circuit cap and select a thermistor to connect to the circuit
Connect P5 to the P5 short-circuit cap and select a photoresistor to connect to the circuit
Connect P6 to the short-circuit cap and select 0-5V adjustable voltage to connect to the circuit
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