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Description
W25Q Series SPI NOR FLASH Memory Module Product Overview
The W25Q series SPI NOR Flash memory modules are based on Winbond‘s W25Q family of serial flash chips, offering multiple capacity options: W25Q80 (8M-bit/1MB), W25Q16 (16M-bit/2MB), W25Q32 (32M-bit/4MB), W25Q64 (64M-bit/8MB), and W25Q128 (128M-bit/16MB). Using a standard SPI interface (SCK, MOSI, MISO, CS), they support clock frequencies up to 104MHz (80MHz for fast read). With low power consumption, high reliability, and long endurance, these modules are widely used in microcontroller data storage, firmware storage, file systems, parameter backup, FPGA configuration, and IoT devices.
W25Q Series SPI NOR FLASH Memory Module Core Features
Wide Capacity Selection： Available in W25Q80/16/32/64/128 options – from 1MB to 16MB – allowing flexible choice based on project requirements
Standard SPI Interface： Supports SPI mode 0/3, requiring only SCK, MOSI, MISO, and CS lines, compatible with all mainstream MCUs (Arduino, STM32, ESP32, 8051, etc.)
High-Speed Read/Write： Clock up to 104MHz, page program time ~0.7ms, sector erase 150-400ms; fast read supports dual/quad SPI
Low Power Consumption： Active current <15mA, standby current <10µA, deep power‑down mode <1µA
Long Endurance & Retention： 100,000+ erase/write cycles, data retention >20 years
Flexible Memory Architecture： 4KB sectors, 32KB/64KB blocks, full chip erase; supports byte/page programming (256 bytes/page)
Protection Features： Hardware write protection (WP pin) and software write protection against accidental writes
Compact Module Size： PCB includes LDO regulator, decoupling capacitors, and pin headers – ready for breadboard or direct soldering
Wide Operating Voltage： Onboard 3.3V LDO accepts both 5V and 3.3V MCU supplies
Industrial Temperature Range： -40℃ to +85℃ for harsh environments
W25Q Series SPI NOR FLASH Memory Module Applications
MCU Data Storage： Store user configuration parameters, sensor history, log files
Firmware Storage： Bootloader storage for OTA (over‑the‑air) firmware updates
File System Host： Used with FatFs, LittleFS for file‑based data management
FPGA Configuration Storage： Store FPGA bitstream for boot‑loading
IoT Devices： Store device certificates, network configurations, and collected data
Development Board Expansion： Add external storage to Arduino, Raspberry Pi, ESP8266/ESP32
Industrial Control： Store production parameters and equipment logs
W25Q Series SPI NOR FLASH Memory Module Key Advantages
Full Capacity Range – Choose as Needed： Whether you need small (1MB) or larger (16MB) capacity, the W25Q series has a model to avoid waste or shortage
Simple and Universal SPI Interface： Only 4 signal lines, minimal I/O usage, connects easily to any MCU
Low Power, Long Life： 100,000 write cycles and 20‑year data retention; standby current as low as 10µA for battery‑powered devices
Industrial Wide Temperature： -40℃ to +85℃ – suitable for outdoor, automotive, and harsh environments
Plug‑and‑Play Module Design： Onboard LDO and headers – no external level shifting needed; works with 3.3V or 5V MCUs
Rich Open‑Source Support： Drivers available for Arduino, STM32, ESP‑IDF (SPIFlash, SerialFlash libraries)
Excellent Cost‑Effectiveness： Faster, lower power, and more reliable than SD cards; fewer pins and simpler circuits than parallel Flash
Why Choose QIXINWEI
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FAQ:
What is the SC7A20H 3‑axis accelerometer module and what are its key features?
The SC7A20H is a low‑power, high‑performance MEMS accelerometer with 12‑bit resolution. It measures acceleration on three axes (X, Y, Z) with selectable full‑scale ranges of ±2g, ±4g, ±8g, and ±16g. It supports both I²C and SPI interfaces, an internal 32‑sample FIFO, multiple wake‑up and interrupt functions, and an embedded temperature sensor. Its ultra‑low power consumption makes it ideal for battery‑powered motion‑sensing applications like wearables, IoT nodes, and impact detection.
How do I select between I²C and SPI communication on the SC7A20H? What is the default I²C address?
The protocol is selected by the logic level on the CS pin. Pull CS high to enable I²C mode; pull CS low for SPI mode. In I²C mode, the 7‑bit device address is 0x18 (or 0x19 if the SDO/SA0 pin is pulled high). Most breakout boards default to I²C with CS tied high and the address set to 0x18. The sensor can share the I²C bus with other devices, and SPI operation supports clock rates up to 10 MHz.
What full‑scale ranges does the SC7A20H support, and how does range affect sensitivity?
The SC7A20H provides four selectable full‑scale ranges: ±2g, ±4g, ±8g, and ±16g. At ±2g, one LSB corresponds to approximately 1 mg, while at ±16g it is about 8 mg. Choose a lower range for fine motion detection (tilt, vibration) and a higher range for shock and impact monitoring (drop detection, sports analytics).
How does the SC7A20H compare with the ADXL345 and MPU‑6050? When should I choose it?
The ADXL345 is a 13‑bit 3‑axis accelerometer with a slightly higher typical current. The MPU‑6050 adds a 3‑axis gyroscope. The SC7A20H competes closely with the ADXL345, offering similar full‑scale ranges and resolution, but with a built‑in FIFO, lower power consumption, and a smaller package. Choose the SC7A20H when you need a low‑power, FIFO‑equipped accelerometer with interrupt‑driven wake‑up and don’t require a gyroscope.
How low can the SC7A20H's power consumption go, and what operating modes are available?
In Low‑Power mode at 1 Hz, the chip draws only about 2 µA. At 50 Hz, consumption is roughly 6 µA in Low‑Power mode, 11 µA in Normal mode, and 25 µA in High‑Resolution mode. The embedded FIFO and motion‑triggered wake‑up interrupts allow the host MCU to sleep while the sensor monitors for activity, dramatically extending battery life.
What interrupt functions does the SC7A20H provide, and can it wake a sleeping MCU?
It has two programmable interrupt pins (INT1 and INT2). You can configure them to trigger on free‑fall, wake‑up, 6D orientation, 4D orientation, single‑tap, or double‑tap events. A common use is to wake the MCU only when movement is detected, which drastically reduces system power consumption. Threshold, duration, and time‑window parameters are adjustable via registers.
What is the purpose of the built‑in 32‑sample FIFO on the SC7A20H?
The FIFO stores up to 32 acceleration samples (X, Y, Z). It allows the host to sleep while the sensor collects data, then read an entire batch at once. This is particularly useful in data‑logging applications where short bursts of motion must be captured without continuous polling. The FIFO supports Stream, Stream‑to‑FIFO, and Bypass modes.
How do I connect the SC7A20H to an Arduino or ESP32? Is there a ready‑to‑use library?
Connect VCC to 3.3 V (the chip is not 5 V‑tolerant), GND to GND, SDA to A4 (or dedicated SDA pin), and SCL to A5 (or dedicated SCL pin). Several open‑source libraries are available on GitHub; you can also use a modified ADXL345 library. For ESP32, the same I²C connections work with the built‑in I²C driver. Install the library, call begin(), and read the X/Y/Z registers.
What is the resolution of the SC7A20H, and what does “12‑bit output” mean?
Each axis is sampled with 12‑bit precision, outputting a signed two’s‑complement value. At ±2g, one LSB equals 1 mg; at ±16g, one LSB equals 8 mg. Actual effective resolution depends on bandwidth and operating mode. For most tilt, vibration, and tap‑detection applications, 12‑bit resolution is more than adequate.
What are the most typical applications for the SC7A20H accelerometer module?
It is used in wearables (pedometers, activity trackers), tilt‑sensing remote controls, free‑fall detection for hard‑disk protection, vibration monitoring, game controllers, and IoT sensor nodes. Its ultra‑low‑power modes, hardware interrupt generation, FIFO, and small package make it ideal for battery‑powered motion‑aware electronics.