Step Down 11 Click

How does it work?

Step Down 11 Click is based on the TPSM82913, a low-noise and low-ripple buck power module from Texas Instruments. The devices operate at a fixed switching frequency of 2.2MHz or 1MHz, which depends on the smart configuration input of the buck module. The AD5142A, a dual-channel 256-position nonvolatile digital potentiometer, controls the smart configuration input. By controlling the smart configuration input, you enable or disable spread spectrum modulation. DC/DC converters generate an output voltage ripple at the switching frequency. The AD5142A also controls the feedback input of the buck module with its other wiper. In addition, the Step Down 11 Click features a soft start, high output accuracy, power-good output, and more.

Step Down 11 Click uses a standard 2-wire interface of the AD5142A to allow the host MCU to set the output voltage, supporting 3MHz bandwidth. You can reset the digital potentiometer over the RST pin in case of need. The I2C address can be selected over the ADDR SEL jumpers (0 set by default). The power-good PG pin will be asserted if the output voltage is not within the specified window threshold. The EN pin is a precision enable input to the regulator.

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.

Specifications

Pinout diagram

This table shows how the pinout on Step Down 11 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	EN	Enable
Reset	RST	2	RST	INT	15	PG	Power Good Output
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Step Down 11 Click electrical specifications

Software Support

We provide a library for the Step Down 11 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Step Down 11 Click driver.

Key functions

• stepdown11_get_resistance Step Down 11 get the resistance function.

• stepdown11_set_voltage Step Down 11 set voltage output function.

• stepdown11_set_mode Step Down 11 set S-CONF device configuration mode function.

Example Description

This library contains API for the Step Down 11 Click driver. This driver provides the functions to set the output voltage treshold.

void application_task ( void ) 
{
    for ( uint8_t vout = 1; vout <= 5; vout++ )
    {
        log_printf( &logger, " Set output voltage %dV rn", ( uint16_t ) vout );
        stepdown11_set_voltage ( &stepdown11, vout );
        Delay_ms( 5000 );
    }
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.StepDown11

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK - MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.