Provide isolated digital input signals for various applications with ISO1228 and STM32L496AG

DIGI Isolator 2 Click is based on the ISO1228, an eight-channel isolated digital input from Texas Instruments. The ISO1228 on this Click board™ is configured in sinking type of inputs. The current drawn from the digital inputs is diverted to LEDs once the digital input crosses the input voltage threshold. This feature allows field-side LED indication with no additional power consumption. The field supply voltage ranges from 8.5 up to 36V, and besides digital inputs, it can be connected over the screw terminals. The isolator also features wire-break detection, an integrated field supply voltage monitor, a built-in CRC check across the barrier, and more. There are several settings that you can make on DIGI Isolator 2 Click. The ISO1228 supports built-in digital low-pass filters, which the software can program. You can also program it over

two FILTER SEL jumpers, which support three input states (high, low, float), resulting in 9 values. Software settings will override those on FILTER SEL. The isolator will turn the FAULT LED on if a fault condition occurs. DIGI Isolator 2 Click can use a standard 4-wire SPI serial interface to communicate with the host MCU, supporting clock frequencies of up to 25MHz. While using the SPI interface, you can reset the device over the RST pin and control the enable function over the EN pin. Whenever the data on inputs of the isolator changes, the interrupt INT pin will go Low. Whenever the information for the synchronization with the host MCU is transmitted, the SYN pin will be asserted High. The SPI interface supports the Burst mode, which can be selected over the FUNC SEL B jumper. You can also use a parallel interface

where the four SPI pins, along with the RST, SYN, and INT, will act as standard general-purpose inputs (isolator outputs). The OUT7 of the ISO1228 is also used as a Burst mode jumper. In parallel mode, you should let the FUNC SEL B jumper float. Furthermore, you can’t use the input 6 of the DIGI Isolator 2 Click board™. The selection of communication can be made over the FUNC SEL C jumper. 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.

The 32L496GDISCOVERY Discovery kit serves as a comprehensive demonstration and development platform for the STM32L496AG microcontroller, featuring an Arm® Cortex®-M4 core. Designed for applications that demand a balance of high performance, advanced graphics, and ultra-low power consumption, this kit enables seamless prototyping for a wide range of embedded solutions. With its innovative energy-efficient

architecture, the STM32L496AG integrates extended RAM and the Chrom-ART Accelerator, enhancing graphics performance while maintaining low power consumption. This makes the kit particularly well-suited for applications involving audio processing, graphical user interfaces, and real-time data acquisition, where energy efficiency is a key requirement. For ease of development, the board includes an onboard ST-LINK/V2-1

debugger/programmer, providing a seamless out-of-the-box experience for loading, debugging, and testing applications without requiring additional hardware. The combination of low power features, enhanced memory capabilities, and built-in debugging tools makes the 32L496GDISCOVERY kit an ideal choice for prototyping advanced embedded systems with state-of-the-art energy efficiency.