Expand the general-purpose input/output capabilities of STM32F302VC with DS2408

Expand 3 Click is based on the DS2408, an 8-channel programmable I/O expander from Analog Devices. The DS2408 has a factory-lasered 64-bit registration number that connects multiple same Click boards™ to the same data line. It communicates with the host MCU through a standard Dallas Semiconductor 1-Wire interface (15.3kbps or 100kbps), with PIO outputs configured as open-drain, providing a maximum on-resistance of 100Ω. A robust PIO channel-access communication protocol ensures that PIO output-setting changes occur error-free. It is suitable for latching PIO logic states into external circuitry, such as a D/A converter (DAC) or microcontroller data bus. This Click board™ communicates with MCU using the 1-Wire interface that, by definition,

requires only one data line (and ground) for communication with MCU. In the absence of a main power supply, the data line can also power the sensor parasitically. The 1-Wire communication line is routed to the GP SEL jumper, allowing the 1-Wire communication signal to the PWM pin or the AN pin of the mikroBUS™ socket. These pins are labeled OW0 and OW1, respectively, the same as the SMD jumper positions, making selecting the desired pin straightforward. Besides, the user is provided with the possibility of external use of the data line (OW) through the unpopulated header in the manner and needs that best suit the desired application, alongside a reset feature. Each DS2408 has its own unalterable and unique 64-bit ROM registration number that is, as mentioned, factory-lasered into

the chip. The registration number guarantees unique identification and addresses the device in a multidrop 1-Wire net environment. Multiple DS2408 devices can reside on a common 1-Wire bus and can operate independently of each other. The DS2408 also supports 1-Wire conditional search capability based on programmable PIO conditions or Power-on-Reset activity. This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the PWR 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.

Clicker 4 for STM32F3 is a compact development board designed as a complete solution, you can use it to quickly build your own gadgets with unique functionalities. Featuring a STM32F302VCT6, four mikroBUS™ sockets for Click boards™ connectivity, power managment, and more, it represents a perfect solution for the rapid development of many different types of applications. At its core, there is a STM32F302VCT6 MCU, a powerful microcontroller by STMicroelectronics, based on the high-

performance Arm® Cortex®-M4 32-bit processor core operating at up to 168 MHz frequency. It provides sufficient processing power for the most demanding tasks, allowing Clicker 4 to adapt to any specific application requirements. Besides two 1x20 pin headers, four improved mikroBUS™ sockets represent the most distinctive connectivity feature, allowing access to a huge base of Click boards™, growing on a daily basis. Each section of Clicker 4 is clearly marked, offering an intuitive and clean interface. This makes working with the development

board much simpler and thus, faster. The usability of Clicker 4 doesn’t end with its ability to accelerate the prototyping and application development stages: it is designed as a complete solution which can be implemented directly into any project, with no additional hardware modifications required. Four mounting holes [4.2mm/0.165”] at all four corners allow simple installation by using mounting screws. For most applications, a nice stylish casing is all that is needed to turn the Clicker 4 development board into a fully functional, custom design.