DRAM Click Board™

Product Code: MIKROE-5337

How Does The DRAM Click Board™ Work? The DRAM Click Board™ is based on the APS6404L-3SQR, a 64Mb PSRAM (Pseudo-Static RAM) memory with an SPI/QPI interface from AP Memory. Organized as 8M x 8 bits each, this memory also has a page size of 1024 bytes alongside high speed and high performance. It also incorporates a seamless self-managed refresh mechanism specially designed to maximize the performance of 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 MCU using the 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 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. Besides, it is required to have a CS pin on a high logic level before beginning any operations. The DRAM 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. SPECIFICATIONS Type DRAM Applications Can be used for low-power and low-cost portable applications On-board modules APS6404L-3SQR - 64Mb PSRAM (Pseudo-SRAM) memory from AP Memory Key Features Low power consumption, SPI/QPI with SDR mode, high performance, organized as 8M x 8bits, page size of 1024 bytes, self-managed refresh mechanism, software reset, and more Interface QSPI,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 of the DRAM Click Board™ 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 IO2 QSPI IO2 QSPI IO3 IO3 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 / QSPI IO1 SDO 5 MISO SCL 12 NC SPI Data IN / QSPI IO0 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 DRAM CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage - 3.3 - V Memory Size - - 64 Mb Operating Temperature Range -25 +25 +85 °C