The part number "W25Q128JVFIQ" refers to a Winbond Memory device, specifically a 128M-bit (16MB) Serial Flash Memory with a QPI (Quad Peripheral interface ), SPI (Serial Peripheral Interface), and DIO (Dual I/O) functions. Winbond Electronics Corporation is the manufacturer behind this part.
Package Type
The specific package for the W25Q128JVFIQ is a SOIC-16 (Small Outline Integrated Circuit, 16-pin) package, though it's important to note that Winbond may offer different packaging for this component. The exact details would depend on the variant of the part.
Pin Function Specification and Detailed Circuit Principle
The W25Q128JVFIQ typically comes in a 16-pin package, and here is a detailed list of the pin functions:
Pin Number Pin Name Pin Function Description 1 VSS Ground pin. Connect to the ground plane of the system. 2 CS Chip Select. Active low, used to enable the chip for communication with the host. 3 DO Data Out (MOSI, Master Out Slave In). This is the output pin for the data being sent to the master in SPI/QPI modes. 4 CLK Clock Input (SCK, Serial Clock). Provides the clock signal to synchronize data transfers. 5 VDD Power Supply Pin. Typically 2.7V to 3.6V for normal operation. 6 WP Write Protect. Active low, used to disable writes to the flash memory. 7 HOLD Hold. Active low, used to pause the serial clock and data transmission without resetting the bus. 8 VSS Ground pin. Connect to the ground plane of the system. 9 IO0 Data I/O (for SPI and QPI). In QPI mode, this pin is used for both input and output of data. 10 IO1 Data I/O (for SPI and QPI). In QPI mode, this pin is used for both input and output of data. 11 IO2 Data I/O (for SPI and QPI). In QPI mode, this pin is used for both input and output of data. 12 IO3 Data I/O (for SPI and QPI). In QPI mode, this pin is used for both input and output of data. 13 NC No Connect. Pin is not internally connected and can be left floating or used for internal testing purposes. 14 NC No Connect. Pin is not internally connected and can be left floating or used for internal testing purposes. 15 NC No Connect. Pin is not internally connected and can be left floating or used for internal testing purposes. 16 NC No Connect. Pin is not internally connected and can be left floating or used for internal testing purposes.Circuit Principle and Explanation
The W25Q128JVFIQ operates as a serial flash memory, which means it communicates over a serial interface (SPI or QPI). The flash memory is non-volatile, so the stored data persists even after power is turned off. The interface allows the user to read and write data to the memory cells by providing clock pulses, chip select signals, and data lines (MOSI, MISO, SCK, etc.). The VDD pin provides power to the device, while the VSS pins connect to the ground.
The chip communicates with a host device (like a microcontroller) using SPI or QPI protocols. The CS pin is used to select the chip for communication, while the DO pin transmits data from the device to the host. The CLK pin is the clock input, ensuring data is transferred at the correct timing.
Pinout FAQ – 20 Common Questions
What is the purpose of the CS (Chip Select) pin? The CS pin is used to enable the chip for communication with the master device. When low, the chip is selected and can communicate. When high, the chip is deselected. How does the VDD pin function? The VDD pin provides the power supply for the device. Ensure the voltage is between 2.7V and 3.6V for proper operation. Can I connect the WP (Write Protect) pin to ground? Yes, connecting the WP pin to ground disables the write protection, allowing you to modify the data stored in the flash memory. What happens if I leave the HOLD pin unconnected? The HOLD pin should be connected to VSS (ground) or left unconnected if not used, but leaving it floating may cause erratic behavior in some designs. What is the function of the IO0-IO3 pins? These are bidirectional data I/O pins that are used in SPI and QPI modes for transferring data to and from the flash memory. Can I use this device in SPI mode? Yes, the W25Q128JVFIQ supports both SPI and QPI modes. SPI mode uses the DO pin for data output and the DI (Data In) pin for input. How do I interface this device with a microcontroller? Connect the CLK, CS, and DO pins from the flash memory to the corresponding pins of the microcontroller. The microcontroller will control the clock and chip select, while the data will be transferred on the DO pin. What is the voltage range for the VDD pin? The VDD pin supports a voltage range between 2.7V and 3.6V. Exceeding this range may damage the device. How many pins does the W25Q128JVFIQ have? The W25Q128JVFIQ has a total of 16 pins in the SOIC-16 package.Is the W25Q128JVFIQ available in a larger pin package?
This part is available in the SOIC-16 package, but different variants may offer other packaging options.What type of memory is the W25Q128JVFIQ?
The W25Q128JVFIQ is a Serial Flash Memory.How do I use the IO0-IO3 pins in QPI mode?
In QPI mode, the IO0-IO3 pins are used to transfer data simultaneously in both directions (full-duplex).What happens when the WP pin is pulled low?
When the WP pin is pulled low, write protection is disabled, and data can be written to the memory.Can I use the W25Q128JVFIQ with 5V logic?
The W25Q128JVFIQ operates with 3.3V logic. Using 5V logic may damage the device, so ensure you use level shifting if required.What is the role of the HOLD pin in a design?
The HOLD pin is used to pause SPI/QPI data transfers without resetting the interface, which can help in low-power applications or during communication interruptions.Can the W25Q128JVFIQ be used for long-term storage?
Yes, the W25Q128JVFIQ is non-volatile and can be used for long-term data storage.What is the clock speed supported by the W25Q128JVFIQ?
The clock speed depends on the mode (SPI or QPI) and the specific configuration but can be as high as 104 MHz in QPI mode.Does the W25Q128JVFIQ have an internal oscillator?
Yes, the W25Q128JVFIQ includes an internal clock generator for SPI/QPI communication.Can I use the W25Q128JVFIQ with an FPGA ?
Yes, the W25Q128JVFIQ can be interfaced with an FPGA using standard SPI or QPI protocols.What is the function of the NC pins?
NC (No Connect) pins are not internally connected and are usually reserved for future use or internal testing. These pins can be left unconnected in most designs.This detailed explanation provides the pin functions, a clear understanding of the W25Q128JVFIQ's working, and answers to frequently asked questions regarding its usage.
