Button 4 Click

How does it work?

Button 4 Click is based on the TPS3422, a low-power push-button reset controller from Texas Instruments, designed to distinguish between brief, unintended key presses and deliberate system reset requests. The TPS3422 operates with exceptionally low current consumption and features a programmable delay mechanism that ensures a reset signal is only generated after a button press is maintained for a specific duration. This eliminates false resets caused by accidental or short-duration presses and enables the differentiation between a software interrupt and a true hard reset. The Button 4 Click is an ideal choice for use cases that require controlled reset behavior, such as in gaming consoles, portable consumer electronics, navigation systems, medical devices for consumer use, and various types of interactive toys.

This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called "Click Snap." Unlike the standardized version of Click boards, this feature allows the main IC area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the TPS3422 can operate autonomously by accessing its signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location.

On the Click Snap section, the push-button labeled as "BUTTON" serves as the user input monitored by the TPS3422. When this button is held down for the duration of the configured delay, the device issues an active-low reset pulse on the OUT pin, which can be routed to a microcontroller or other system component to initiate a reset. The delay time before triggering the reset is configurable via the onboard TS SEL switch. By toggling this switch to position '1', the timer is effectively disabled (0 seconds delay), causing an immediate 400ms reset pulse upon button press. Conversely, setting the switch to position '0' activates a 7.5-second delay, requiring the button to be pressed and held for that full duration before the reset signal is issued, again lasting 400ms.

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. Also, this 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.

Click Snap

Click Snap is an innovative feature of our standardized Click add-on boards, designed to bring greater flexibility and optimize your prototypes. By simply snapping the PCB along predefined lines, you can easily detach the main sensor/IC/module area, reducing the overall size, weight, and power consumption - ideal for the final phase of prototyping. For more details about Click Snap, visit the official page dedicated to this feature.

Specifications

Pinout diagram

This table shows how the pinout on Button 4 Click 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	OUT	Active-Low Reset Pulse
ID COMM	CS	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

Button 4 Click electrical specifications

Software Support

Button 4 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of the Button 4 Click board by initializing the device and detecting the button state changes. It logs whether the button is pressed (active) or released (reset).

Key Functions

• button4_cfg_setup This function initializes Click configuration structure to initial values.
• button4_init This function initializes all necessary pins and peripherals used for this Click board.
• button4_get_out_pin This function returns the OUT pin logic state.

Application Init

Initializes the logger and the Button 4 Click driver.

Application Task

Monitors the button state and logs whether the button is active (pressed) or reset (released) when a state change is detected.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.