Keep critical information readily available and secure with CY14B101PA and STM32G071RB

nvSRAM 4 Click is based on the CY14B101PA, a 1-Mbit nvSRAM memory organized as 128K words of 8 bits each, with a fully-featured real-time clock from Infineon. The nvSRAM specifies one million endurance cycles for nonvolatile cells with data retention of a minimum of 20 years. All the reads and writes to nvSRAM happen to the SRAM, which gives nvSRAM the unique capability to handle infinite writes to the memory. The benefit of nvSRAM over serial EEPROMs is that all reads and writes to nvSRAM are performed at the SPI speed with zero cycle delay, which means, therefore, no wait time is required after any of the memory accesses. In addition to the CY14B101PA, this Click board™ is equipped with the button cell battery holder compatible with the 3000TR battery holder, suitable for 12mm Coin Cell batteries. When the primary power fails and drops below 2.65V, this Click board™ switches to the backup power supply by placing a jumper labeled as RTC-BATT. By utilizing an automatic backup, the CY14B101PA uses an external battery power source when there is no power supply on its main power terminals, allowing for uninterrupted operation. nvSRAM 4

Click communicates with MCU using a standard SPI interface with clock frequency up to 40MHz, zero cycle delay read, and write cycles. It also supports the two most common modes, SPI Mode 0 and 3, and 104 MHz SPI access speed with special instructions for the read operation. The CY14B101PA uses the standard SPI opcodes for memory access. In addition to the general SPI instructions for reading and writing, it provides four special instructions: STORE, RECALL, AutoStore Disable (ASDISB), and AutoStore Enable (ASENB). The STORE operation of the CY14B101PA can be controlled and acknowledged via the HSB pin, routed on the RST pin of the mikroBUS™ socket. If no STORE/RECALL is in progress, this pin can request a hardware STORE cycle. When the HSB pin is driven LOW, the CY14B101PA initiates a STORE operation conditionally. Also, this Click board™ can use the AutoStore feature of the SRAM data in nonvolatile cells when the power goes down, providing power-down data security by placing a jumper labeled as RTC-CAP. An additional feature of this Click board™ represents the configurable Write Protection function labeled

as WP routed on the PWM pin of the mikroBUS™ socket. The WP pin protects the entire memory and all registers from write operations and must be held high to inhibit all the write operations. When this pin is high, all memory and register writes are prohibited, and the address counter is not incremented. Besides, the nvSRAM 4 Click also has additional HOLD and Interrupt pins, routed to the AN and INT pins of the mikroBUS™ socket labeled as HLD and INT. The HLD pin is used to pause the serial communication without stopping the operation of the write status register, programming, or erasing in progress. On the other hand, an INT pin can be used in several ways, such as interrupt output, calibration, or a square wave, programmable to respond to the clock alarm, the watchdog timer, and the power monitor. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Nucleo-64 with STM32G071RB MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin

headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is

provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.