W25Q128JVSIM Detailed explanation of pin function specifications and circuit principle instructions

The model "W25Q128JVSIM" is a part number for a Winbond Memory chip, specifically a Serial Flash Memory device.

Below are the detailed specifications for the pinout, packaging, pin function descriptions, and a list of frequently asked questions.

1. Brand and Package

Brand: Winbond Model: W25Q128JVSIM Package Type: The W25Q128JVSIM typically comes in the SOIC-8 (Small Outline Integrated Circuit) or WSON-8 package. However, the exact package can vary depending on the application and requirements. Package Pins: 8 pins in total for SOIC-8.

2. Pin Function Details

The W25Q128JVSIM is a 128M-bit (16MB) serial flash memory with a SPI interface .

Pinout and Pin Functions (SOIC-8) Pin Number Pin Name Pin Function Description 1 VCC Power supply pin for the chip. Typically 2.7V to 3.6V range. 2 SO (MISO) Serial Output. Data is read out on this pin. This is the MISO (Master In Slave Out) pin for the SPI interface. 3 WP Write Protect. This pin can be used to prevent write operations to the flash memory. If tied high, it disables writes to the memory. 4 GND Ground pin for the device. Connects to the system ground. 5 HOLD Hold. When this pin is pulled low, it temporarily stops the serial Clock (SCK), freezing the current operation. 6 SCK Serial Clock. The SPI clock signal. Used for synchronizing data transfer between master and slave devices. 7 CS (Chip Select) Chip Select. When this pin is low, the chip is selected and communication can take place. 8 SI (MOSI) Serial Input. Data is written to this pin. This is the MOSI (Master Out Slave In) pin for the SPI interface.

3. Circuit Principle Instructions

The W25Q128JVSIM communicates using the SPI (Serial Peripheral Interface), which involves four primary signals: MOSI (Master Out Slave In), MISO (Master In Slave Out), SCK (Serial Clock), and CS (Chip Select). The WP (Write Protect) pin allows disabling write operations to prevent accidental changes to the flash memory contents. The HOLD pin can pause operations temporarily by halting the clock signal, allowing other operations to take place without interference. Proper decoupling capacitor s should be used for the power supply (VCC) to ensure stable operation.

4. Common Questions (FAQ)

1. What is the supply voltage range for the W25Q128JVSIM? The W25Q128JVSIM operates with a supply voltage of 2.7V to 3.6V. 2. How many pins are there in the W25Q128JVSIM package? The W25Q128JVSIM in the SOIC-8 package has 8 pins. 3. What is the function of the WP pin? The WP pin is used to write protect the memory. When held high, it disables write operations to the flash memory. 4. Can I use the W25Q128JVSIM at 5V? No, the operating voltage range is from 2.7V to 3.6V. Applying 5V will damage the device. 5. What is the significance of the HOLD pin? The HOLD pin allows you to temporarily stop the clock signal and halt the current operation, which is useful in certain timing or operational scenarios. 6. How do I read data from the W25Q128JVSIM? You can read data from the memory using the MISO (SO) pin while the SPI clock (SCK) is active. 7. Can I use the W25Q128JVSIM in a 3.3V system? Yes, the W25Q128JVSIM is fully compatible with 3.3V logic levels, making it ideal for 3.3V systems. 8. What happens if I leave the CS pin high? If the CS pin is high, the device is not selected, and no communication will take place. It must be low to initiate communication. 9. How do I write data to the memory? Write data to the W25Q128JVSIM using the MOSI (SI) pin, while the SCK clock is active. 10. What is the typical application of the W25Q128JVSIM? The W25Q128JVSIM is commonly used in embedded systems for data storage, including applications in microcontrollers, FPGA , and IoT devices. 11. What is the maximum frequency for the SPI clock? The maximum frequency for the SPI clock (SCK) typically ranges from 50 MHz to 80 MHz, depending on the operating conditions. 12. What is the role of the SCK pin? The SCK (Serial Clock) pin is used to clock the data transfer between the master and slave devices over the SPI interface. 13. Can the W25Q128JVSIM be used in low power applications? Yes, it is suitable for low power applications, thanks to its efficient design and low-voltage operation. 14. How do I configure the device for 4-wire SPI mode? The W25Q128JVSIM operates in 4-wire SPI mode by default, where the pins used are MOSI, MISO, SCK, and CS. 15. Is there a method to check if the device is properly connected? Yes, you can perform a device ID read command to verify the correct connection and check the manufacturer's ID and device ID. 16. How do I erase data from the W25Q128JVSIM? You can erase data using specific commands such as Block Erase, Sector Erase, or Chip Erase via the SPI interface. 17. What is the storage capacity of the W25Q128JVSIM? The W25Q128JVSIM has a storage capacity of 128 Mbits (16 MB). 18. How do I manage the flash memory wear leveling? The flash memory automatically manages wear leveling, but it's important to follow the manufacturer's guidelines for endurance, as flash memory can wear out after a certain number of write cycles. 19. Can I access the memory while the device is in hold mode? No, the device cannot transfer data while in hold mode. The HOLD pin must be released (high) for normal operations to resume. 20. What happens if I forget to tie the WP pin to a logic level? If the WP pin is left floating, it could potentially lead to unpredictable behavior or unintentional write protection. It is recommended to tie this pin to a logic high for write protection or to ground it to enable writes.

This explanation covers the important pin function descriptions, the circuit principles, and common queries regarding the W25Q128JVSIM model. For additional details, always consult the datasheet for the specific configuration of your device.