nvSRAM 2 Click Board™

Product Code: MIKROE-4423

How Does The nvSRAM 2 Click Board™ Work? The nvSRAM 2 Click Board™ is based on the CY14B101Q, a 1-Mbit nvSRAM organized as 128K words of 8 bits each with a nonvolatile element in each memory cell from Cypress Semiconductor. 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. Besides, 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. Therefore, no wait time is required after any of the memory accesses. In the event of system power loss, data from the SRAM is transferred to its nonvolatile cell automatically by using energy stored in a capacitor labelled as C2. During the Power-Up, data from the nonvolatile cell is recalled automatically in the SRAM array and available to the user. The endurance cycle is consumed only when data transfer happens from the SRAM cells to nonvolatile cells during the Power-Down.

The memory can be accessed through a standard SPI interface that enables high clock speeds up to 40 MHz with 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 instruction for the read operation. The CY14B101Q 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). In addition to this, the nvSRAM 2 Click also has an additional HOLD pin, routed to the PWM pin of the mikroBUS™ socket labelled as HLD, used to pause the serial communication with the device without having to stop the operation of write status register, programming, or erasing in progress. The nvSRAM 2 Click Board™ is designed to be operated only with a 3.3V logic voltage level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic levels. Specifications Type SRAM Applications Can be used for all applications that require fast access and high reliability of stored data, and unlimited endurance. On-board modules nvSRAM 2 Click is based on the CY14B101Q, a 1-Mbit nvSRAM organized as 128K words of 8 bits each with a nonvolatile element in each memory cell from Cypress Semiconductor. Key Features Low power consumption, 1Mbit nonvolatile static random access memory, high reliability, high speed interface, write protection feature, and more. Interface SPI Compatibility mikroBUS Click board size S (28.6 x 25.4 mm) Input Voltage 3.3V Pinout diagram This table shows how the pinout on nvSRAM 2 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 HLD HOLD Function NC 2 RST INT 15 NC SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 NC SPI Data IN SDI 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground Onboard settings and indicators Label Name Default Description LD1 PWR - Power LED Indicator nvSRAM 2 Click electrical specifications Description Min Typ Max Unit Supply Voltage -0.5 3.3 4.1 V Memory Size -