W25Q64 64Mbit SPI Flash Storage Module
= High-Speed Serial Flash Memory for Microcontroller Projects =
The W25Q64 is a 64Mbit (8Mbyte) serial NOR Flash memory module designed for reliable data storage and code execution . It is widely used for firmware storage, data logging, and voice/text storage in embedded systems .
64Mbit Storage Capacity Provides 8MB of nonvolatile memory for your projects
HighSpeed SPI Interface Supports up to 133MHz clock with Quad SPI mode
Operating voltage: 2.7V to 3.6V
Memory organization: 32,768 pages of 256 bytes each
More than 100,000 erase/program cycles
More than 20-year data retention
= Key Features =
+Supports Standard, Dual, and Quad SPI for flexible interface options
+Uniform 4KB sectors and 32KB/64KB blocks for efficient erase operations
+Low power consumption: 4mA active read current, 1µA power-down current
+Hardware and software write protection features
+64-bit unique ID and JEDEC standard manufacturer/device ID
== Applications ==
- Code shadowing and executeinplace (XIP) for microcontrollers
- Data logging, voice, and text storage
- Firmware storage and system configuration
- IoT devices and industrial control systems
Reliable Storage Solution - Proven SpiFlash technology from Winbond
Easy Integration - SPI interface works with Arduino, STM32, ESP32
√ 64Mbit (8MB) capacity for moderate storage needs
√ Available in SOIC8, WSON8, and other packages
√ Compatible with 3.3V logic systems
= Hardware Interface =
| Pin | Function | Arduino Connection |
|---|
| CS | Chip Select | Digital Pin 10 (example) |
| CLK | Serial Clock | Pin 13 (SCK) |
| DI (MOSI) | Data Input | Pin 11 (MOSI) |
| DO (MISO) | Data Output | Pin 12 (MISO) |
| VCC | Power (2.7-3.6V) | 3.3V |
| GND | Ground | GND |
Use the SPIMemory library in Arduino IDE for easy interfacing
For 5V systems, use a module with onboard level shifting
Chips come blank and do not have a wear-leveling subsystem
= Troubleshooting =
Module not detected:
- Verify VCC is within 2.7-3.6V range
- Check SPI connections (MISO, MOSI, SCK, CS)
- Ensure CS pin is pulled LOW to start transaction
No data read/write:
- Use 3.3V logic level for direct connection
- For 5V systems, use a level shifter module
- Verify library initialization and SPI settings
