Power MUX 2 Click Board™

Product Code: MIKROE-4575

How Does The Power MUX 2 Click Board™ Work? The Power MUX 2 Click Board™ as its foundation uses the TPS2120, a highly configurable power mux with an automatic switchover feature from Texas Instruments. This dual-input single-output power multiplexer prioritizes the main supply of 12V when present and quickly switches to an auxiliary supply of 5 V when the main supply drops. A priority voltage supervisor is used to select an input source. During switchover, the voltage drop is controlled to block reverse current before it happens and provide uninterrupted power to the load with minimal hold-up capacitance. If one of the input power supplies were to fail, the system needs to automatically switchover to a backup power source without interrupting regular operation. When the 12V supply on IN1 drops below 7.6V, the device will automatically switch to the 5V auxiliary supply on IN2. When the 12V supply returns, it will become the output supply again. Furthermore, the voltage drop on the output should be minimal, providing the output with uninterrupted redundant power.

The Power MUX 2 Click Board™ communicates with MCU through the 3-Wire SPI serial interface using the TPL0501, an onboard 256-taps digital potentiometer from Texas Instruments. This way, the TPL0501 serves a current limiter that adjusts the output current of the TPS2120 instead of an external resistor. Current limiting can be used during Startup and switchover to protect against overcurrent events and protect the device during regular operation. As an additional feature, this Click board™ also has two red LED indicators labelled as IN1 and IN2, which visually indicate to the user the fact which one of the two power supplies, IN1 or IN2, is located on the output more precisely on the output connector of the Click board, labelled as OUT. The Power MUX 2 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 properly use the SPI communication lines. 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 Power Switch Applications Can be used for applications as a backup and standby power, input source selection, and various systems having multiple power sources. On-board modules TPS2120 - highly configurable power mux with an automatic switchover feature from Texas Instruments TPL0501 - 256-taps digital potentiometer from Texas Instruments Key Features Low power consumption, automatic switchover, output current limit, uninterrupted power solution, and more. Interface SPI Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the Power MUX 2 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 NC 2 RST INT 15 NC SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC NC 5 MISO SCL 12 NC SPI Data IN SDI 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 LD3 IN1 - Primary Power Switch LED Indicator LD2 IN2 - Secondary Power Switch LED Indicator JP1 VCC SEL Left