UART MUX Click Board™

Product Code: MIKROE-3878

How Does The UART Mux Click Board™ Work? The UART MUX Click Board™ is equipped with the SN74LV4052A, a Dual 4-Channel Multiplexer and Demultiplexer, from Texas Instruments. Two control pins are used to switch to one of four available outputs, from a single UART input, from the mikroBUS. Control pins labelled as A and B, are routed to the mikroBUS and can be operated by both 3.3V and 5V MCUs. The fourth control pin is labelled as EN pin, and it is used to enable the internal multiplexing switches of the IC, when is set to a HIGH logic level (it is active HIGH). A and B pins are routed to CS and PWM pins of the mikroBUS respectively. The active low Inhibit (INH) tri-state all the channels when high and when low, depending on the A and B inputs, one of the four independent input/outputs is connected to the UART communication pins. INH pin is routed to the RST pin on the mikroBUS. The ultra-low leakage current ensures that there is no signal interference from the inputs that are not selected by the A and B pins.

A low crosstalk also ensures that the signal on one channel remains clean of interferences caused by other channels. This ensures a reliable operation of the IC and the Click Board™ itself. The output signals can be connected via the 2x4 pin headers. Besides RX and TX pins, every output also has dedicated VCC and GND pins available, so that user can easily route multiple devices with this Click Board™. Independent power supply input allows the user to work with a wide range of signal amplitudes, depending on the application requirements, as long as the power supply stays within the limits. More information about the SN74LV4052A can be found in the attached datasheet. However, the Click Board™ comes equipped with a library that contains easy to use functions and a usage example that may be used as a reference for the development. The UART MUX Click Board™ offers a selection between 3.3V and 5V operation, with the onboard SMD jumper, labelled as PWR SEL. This allows both 3.3V and 5V MCUs to be interfaced with this Click Board™. SPECIFICATIONS Type DAC Applications Telecomunications, Infotainment, Signal Gating and Isolation, Home Appliances, Programmable Logic Circuits, Modulation and Demodulation On-board modules SN74LV4052A, a Dual 4-Channel Analog Multiplexer and Demultiplexer from Texas Instruments Key Features High On-Off Output-Voltage Ratio, Extremely Low Input Current, 2-V to 5.5-V VCC Operation Interface GPIO,UART Compatibility mikroBUS Click Board™ size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the UART MUX Click Board™ corresponds to the pinout on the mikroBUS socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 B Control Pin B Inhibit Input INH 2 RST INT 15 NC Control Pin A A 3 CS RX 14 TX UART Transmit NC 4 SCK TX 13 RX UART Receive NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description PWR PWR - Power LED Indicator J1 VCC SEL Left Power supply voltage selection: left position 3.3V, right position 5V