|Module Size||About 36mm(length) x 17.5mm(width)|
The FT232RL is a USB to serial UART interface IC with the following advanced features:
Features of FT232RL USB TO TTL 5V 3.3V Convertor
|On-chip voltage regulator||3.3 V output|
|Temperature Range||-40 to +85 deg C|
|Reset circuit||On-chip power-on reset circuit|
|Clock||Integrated clock; no external crystal required|
|IC used||popular CP2102 IC|
|Communication chip:||Domestic Max3232|
|Port||TX RX VCC GND|
|Fast baud rates||Up To 250kbps|
The modules makes it simple to use with microcontroller's UART to to create bidirectional RS485 networks.
Typical Connections between MCU and MAX485
|TX-OUT-UART||DI - Data Input|
|RX-IN-UART||RO - Receive Output|
|TX_EN||RE-DE combined pins called as TX_EN||When MCU Wants to Transmit it makes TE_EN high, else LOW|
|Supports baud rate range||75bps - 115200bps , up to 6Mbps|
|temperature range||-40dgC ~ +85dgC|
In order to carry through remote digital communication between computers with various standard series interfaces converter facilities or intelligent instruments, it needs inter exchange of standard series interface converter of compatible RS-232C and RS-485/422 standard is able to convert mono-end RS-232 signal to balance difference RS-485/422 signal and extend the communication distance to 1.2km. No external power but adopts a particular
RS-232 charge pump to drive the system, and gains electricity without initializing the RS-232 series interface. An internal zero delay auto transceiver and particular I/O circuit automatically control the data stream direction in stead of an handshake signal (for example RTS,DTR etc).There by in guarantees the function under RS-485/422 without changing the program compiled under RS-232 Full-duplex mode and assures the adaptation to current operation software and interface hardware. The transmission rate of 300-115.2kbps. Is capable of applying between host computers, host computer and is extensions or external equipment and forms point-to-point or point-to-multipoint remote and multi-communication network, It implements multi-machine response communication and commonly used in systems of industrial automation control all-one-card. Door safe, car parking, ATM, bus charge, eatery sell out, staff attendance management, and toll highway etc.
Connector an signal:
RS-232C bay-line distribution
RS-232C Interface Signal
RS-485/422 data output connector and bay-line distribution
+5V Standby Power input
|Power supply||+5V DC|
|Inputs||4 analog inputs programmable single-ended or differential input|
|ADC converter||8-bit successive approximation A / D converter|
|Module PCB size||3.6cm * 2.3cm|
|Interface||A serial I2C bus interface|
This particular module is suitable for tutorial use and perhaps for some hobbyists. Its drawback is that its I2C address is hard-wired to all zeros. (Note that I2C is a very effective 2-wire communications standard that is used by many small semiconductor devices such as microcontrollers and sensor peripherals.) If the address lines could be jumpered high or low, then several identical modules could be placed on the same I2C lines. I would therefore recommend the alternative module named the Mini PCF8591 AD DA Shell Module because it has that capability. It is also at least three times the price.
The IC permits only 8 bit data allowing only 256 steps in the analog output value or the digital output value. This is likely borderline for hobbyists who may want to build instrumentation or test equipment.
My tests show another frustration: A lower than expected analog output voltage. For a 4.88 volt supply the output is only 4.17 volts (85%) at maximum value setting. Since the maximum supply voltage is 8 volts, increasing the supply to 6 volts may get a 5 volt result. I did not remove the green LED and related resistor to see if the problem was simply an excess current drain from the ICs AOUT.
Reference: PCF8591 8-bit A/D and D/A converter Product Specification, 2003-01-27, Philips Semiconductor.
PCF8591 Module YL-40
The module is composed of:
The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the HV' pin, low voltage (3.3V for example) to LV', and ground from the system to the GND pin.