DRAM Click is a compact add-on board representing a dynamic random-access memory solution. This board contains the APS6404L-3SKR from AP Memory, a high-performance 64Mb SPI/KPI PSRAM memory organized as 8M x 8 bits each. This Pseudo-SRAM device features a high speed, low pin count interface and incorporates a seamless self-managed refresh mechanism to maximize the performance of memory read operation. It has 4 SDR I/O pins and operates in SPI or QPI (quad peripheral interface) mode with frequencies up to 133 MHz. This Click board™ is most suitable for low-power and low-cost portable applications.

DRAM Click is based on the APS6404L-3SQR, a 64Mb PSRAM (Pseudo-SRAM) memory with an SPI/QPI interface from AP Memory. Organized as 8M x 8 bits each, this high speed, high performance memory has a page size of 1024 bytes. It also incorporates a seamless, self-managed refresh mechanism specially designed to maximize the performance of the memory read operation (it does not require the support of DRAM refresh from the system host). It is most suitable for low-power and low-cost portable applications.

The APS6404L-3SQR communicates with the MCU using a SPI serial interface that also supports Quad SPI and the two most common modes, SPI Mode 0 (QSPI Mode 1), with a maximum SPI frequency of 133MHz. The APS6404L-3SQR includes an on-chip voltage sensor that is used to start the self-initialization process. When the main power supply voltage reaches a stable level at or above the minimum supply voltage level, the device will require 150μs and user-issued RESET Operation to complete its self-initialization process. The device powers up in SPI mode by default configuration but can also be switched into QPI mode. The CS pin must be set to high logic level before initiating any operations.

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. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference, for further development.

• Interface: QSPI, SPI
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V
• Supply Voltage: 3.3V
• Memory Size: 64 Mb
• Operating Temperature Range: Min. -25°C, Typ. +25°C, Max. +85°C

• Schematic
• APS6404L-3SQR Datasheet
• mikroSDK
• LibStock