UART MUX 4 Click Board™

Product Code: MIKROE-5720

How Does The UART MUX 4 Click Board™ Work? The UART MUX 4 Click Board™ is based on the 74HC4066D, a quad single-pole, single-throw analogue switch from Nexperia. The CMOS level inputs of the 74HC4066D include clamp diodes, which in turn allow current limiting resistors to interface inputs to voltages exceeding VCC. This Click board™ has two multiplexed 4-pin UART headers labelled UART1 and UART2. The UART header lines are labelled for corresponding pins. It offers fast switching speeds with a turn-OFF time of 13ns and 11ns for turn-ON if powered with 5V. The UUART MUX 4 Click Board™ uses a standard UART interface to communicate with the host MCU, with commonly used RX and TX lines. To switch between the two output UART interfaces, this Click board™ features a switch in the form of an NPN transistor circuit. This switch circuit allows using one of the outputs UART interfaces via the SW pin of the mikroBUS™ socket with a simple logic state. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper.

This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Port expander, RS-232 Applications It can be used for the development of a wide range of applications, from industrial and instrumentation to consumer, communications, data-acquisition systems, and many more On-board modules 74HC4066D - quad single-pole, single-throw analogue switch from Nexperia Key Features Fast turn-ON and turn-OFF times, two output UART interfaces, 3.3V and 5V operation, clamp diodes included on inputs, CMOS level, ESD protection, and more Interface UART Compatibility mikroBUS Click board size S (28.6 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the UART MUX 4 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 NC UART Output Switch SW 2 RST INT 15 NC NC 3 CS RX 14 TX UART TX NC 4 SCK TX 13 RX UART RX 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 LD1 PWR - Power LED Indicator JP1 VCC SEL Left Power/Logic Voltage Level Selection 3V3/5V: Left position 3V3, Right position 5V UART MUX 4 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage 3.3 5 V