Analog MUX 4 Click Board™

Product Code: MIKROE-4795

How Does The Analog MUX 4 Click Board™ Work? The Analog MUX 4 Click Board™ is based on the TMUX1308, a general-purpose 8:1 single-ended CMOS analogue multiplexer from Texas Instruments. The TMUX1308 multiplexer allows for multiple inputs/sensors to be monitored with a single AN pin of the mikroBUS™ socket supporting bidirectional analog and digital signals ranging from 0 to 5V. It has an internal injection current control eliminating the need for external diode and resistor networks to protect the switch, keeping the input signals within the supply voltage. The internal injection current control circuitry allows signals on disabled signal paths to exceed the supply voltage without affecting the signal of the enabled signal path. Alongside internal injection current control, the TMUX1308 also has another protection feature, called Break-before-make delay, which represents a safety feature preventing two inputs from connecting when the device is switching. The output first breaks from the ON-state switch before connecting with the next ON-state switch.

This time delay between the break and the make is known as the break-before-make delay. The Analog MUX 4 Click Board™ communicates with MCU using several GPIO pins. It can be enabled or disabled through the EN pin routed to the CS pin of the mikroBUS™ socket; hence, offering a switch operation to turn ON/OFF power delivery to the TMUX1308. It also provides three address signals, labelled from A0 to A2 and routed to the PWM, INT, and RST pins of the mikroBUS™ socket, that control the switch configuration and determine the activation of the desired analog input channel based on their setup. Also, each analog input has a jumper for its hardware activation or deactivation and capacitors for additional filtering of the input channels. The Analog MUX 4 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to 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 Measurements Applications Can be used for various applications, from industrial to instrumentation, consumer, communications, and more On-board modules TMUX1308 - general-purpose 8:1 single-ended CMOS analog multiplexer from Texas Instruments Key Features Injection current control, back-powering protection, bidirectional signal path, Break-Before-Make switching, VCC range signal handling, TTL/CMOS-logic compatible, pin-controllable, and more Interface Analog,GPIO 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 Analog MUX 4 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Analog Signal AN 1 AN PWM 16 A0 Switch Control 0 Switch Control 2 A2 2 RST INT 15 A1 Switch Control 1 Enable EN 3 CS RX 14 NC NC 4 SCK TX 13 NC 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 Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V ANALOG MUX 4 CLICK ELECTRICAL SPECIFICATIONS Description Mi