The model number "W25Q128JVEIQ" belongs to Winbond, a well-known semiconductor company that produces memory devices like NOR Flash memory.
Packaging and Pin Function Specification
Packaging: The W25Q128JVEIQ is a 128Mb (16MB) NOR Flash memory device. It typically comes in a SOIC-8 (Small Outline Integrated Circuit) or WSON (Chip-on-Board Package), and other packaging options may exist depending on the specific supplier.
For the W25Q128JVEIQ, the most commonly used packaging is the 8-pin SOIC package, but the device is also available in 16-pin and other packaging types depending on the specific series of the device. You requested detailed information on all pins for this device, so let's break it down.
Pin Function List (8-pin SOIC Package Example)
Here is the detailed explanation of each pin function for the W25Q128JVEIQ in an 8-pin SOIC package:
Pin Number Pin Name Pin Function Description 1 CS# (Chip Select) This pin is used to select the device for communication. It is an active-low signal that must be pulled low to enable the chip for read/write operations. 2 SO (Serial Output) This is the output pin for data that is sent from the Flash memory to the host (e.g., microcontroller or processor). It is used during read operations. 3 WP# (Write Protect) This pin is used to enable or disable write protection. When held low, it allows writing to the memory. When held high, it prevents writes. 4 VSS (Ground) Ground pin, used to complete the circuit and provide a reference voltage of 0V. 5 SCK (Serial Clock ) This is the clock input used to synchronize the communication between the host and the Flash memory. It is driven by the master device (e.g., microcontroller). 6 SI (Serial Input) This is the input pin used to send data to the Flash memory. During write operations, data is sent to the memory via this pin. 7 HOLD# (Hold) This pin can be used to pause the serial communication without de-selecting the chip. When it is low, the serial communication will be held until it is released. 8 VCC ( Power Supply) The power supply pin, which typically operates at 2.7V to 3.6V for the W25Q128JVEIQ. This pin provides power to the memory device.Pinout Diagram
For a more accurate representation, the full pinout diagram of the device is shown in the datasheet provided by Winbond. The pin functions listed above represent the most common configuration for the W25Q128JVEIQ in an 8-pin SOIC package.
Circuit Principle & Usage Explanation
Basic Operation: Data Transmission: The data is transmitted to and from the Flash memory device over the SI and SO pins, which are used for input and output respectively. Clocking: The SCK pin provides a clock signal, synchronized with the data being transferred. Chip Selection: The CS# pin must be pulled low to select the device for communication; when high, the device is deselected, and communication is halted. Write Protection: The WP# pin ensures that the device cannot be written to if needed by setting it high to enable write protection. Circuit Considerations: Power Supply: Connect the VCC and VSS pins to the power supply and ground, respectively. Ensure the voltage level remains within the operating range (typically between 2.7V and 3.6V). Signal Integrity: Ensure that the SCK, CS#, SI, and SO lines are properly terminated to avoid signal interference or loss during high-speed data transfers.FAQ (Frequently Asked Questions)
Q: What is the operating voltage range for the W25Q128JVEIQ? A: The W25Q128JVEIQ operates between 2.7V and 3.6V for VCC, which is the power supply.
Q: What is the purpose of the CS# pin? A: The CS# pin is used to select the chip for communication. It must be pulled low to enable the device and initiate read or write operations.
Q: How does the Write Protect (WP#) pin function? A: When WP# is pulled high, it prevents any write operations to the memory. If WP# is low, writing to the device is allowed.
Q: What happens if the SCK pin is not supplied with a clock signal? A: Without a clock signal on the SCK pin, the device will not be able to synchronize the read/write operations, and communication will not occur.
Q: Can the W25Q128JVEIQ support high-speed data transfer? A: Yes, the W25Q128JVEIQ supports high-speed data transfer, with a maximum clock frequency up to 133 MHz.
Q: What does the SO pin do? A: The SO pin is used to send data from the memory to the host device during read operations.
Q: Can the W25Q128JVEIQ be used in SPI mode? A: Yes, the W25Q128JVEIQ supports SPI (Serial Peripheral Interface) for communication with external devices.
Q: How do I pause the serial communication with the W25Q128JVEIQ? A: You can use the HOLD# pin to pause the communication. When this pin is held low, the serial transfer is paused until it is released.
Q: What are the typical applications for the W25Q128JVEIQ? A: The W25Q128JVEIQ is commonly used in applications such as boot code storage, embedded systems, consumer electronics, and IoT devices that require non-volatile memory.
Q: How does the W25Q128JVEIQ handle data retention? A: The W25Q128JVEIQ offers reliable data retention for up to 20 years, ensuring that the stored data remains intact over a long period without power.
Q: How do I initiate a read operation on the W25Q128JVEIQ? A: To initiate a read operation, you must first pull the CS# pin low, then send a read command via the SI pin while providing a clock signal on the SCK pin.
Q: Can the W25Q128JVEIQ store data persistently without power? A: Yes, the device retains data even when power is lost due to its non-volatile memory type.
Q: Can I perform a bulk erase on the W25Q128JVEIQ? A: Yes, the W25Q128JVEIQ supports sector and full chip erase operations to clear the memory contents.
Q: How do I configure the Write Protect pin? A: The WP# pin should be pulled high to enable write protection. To disable it, the pin must be pulled low.
Q: What is the maximum number of erase/program cycles supported by the W25Q128JVEIQ? A: The W25Q128JVEIQ supports up to 100,000 erase/program cycles for each sector.
Q: Can I read and write data simultaneously with the W25Q128JVEIQ? A: No, the W25Q128JVEIQ is a sequential memory device, meaning it can only either read or write at a time.
Q: What are the default values for the control pins when the device is powered on? A: Upon power-up, the CS# pin should be high to deselect the chip, and the WP# pin is normally set to high for write protection.
Q: How can I check the status of the memory device? A: The W25Q128JVEIQ provides a status register that can be read through SPI commands to monitor the device's state.
Q: Can I use the W25Q128JVEIQ in a multi-chip configuration? A: Yes, you can use multiple W25Q128JVEIQ devices in parallel by managing the chip-select (CS#) pins independently.
Q: How do I write data to the W25Q128JVEIQ? A: To write data, you need to pull the CS# pin low, send the write command over the SI pin, and provide the address for the data using the appropriate number of clock cycles on the SCK pin.
This should give you a detailed overview of the W25Q128JVEIQ model, its pin functions, and its most common use cases.