Project Description Creation

hasofukirsch

hasofukirsch

what voltage is expected on the pin 5, 2, etc. pins of this chip? specifically do(io1), di(io0), io2 and io3?
363 days

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Project
QSPI_SD0
The datasheet for the W25Q128JVSIQ specifies that the data I/O pins—including DI(IO0), DO(IO1), IO2, and IO3—operate at voltages defined by the device’s supply voltage (VCC, which is in the range of 2.7V to 3.6V).
In general, the electrical characteristics for these pins are given in the datasheet’s "Electrical Characteristics" section. Under typical conditions (with VCC = 3.3V), you will often see:
  • A minimum input high level (VIH) around 70% of VCC (approximately 2.31V), and
  • A maximum input low level (VIL) around 30% of VCC (approximately 0.99V).
Similarly, for output levels:
  • When driving a logic "high," the output (for example, DO(IO1)) will be very close to the supply voltage (typically just a few hundred millivolts below 3.3V), and
  • For a logic "low," the output will be near 0V.
For exact thresholds and performance margins (including any specific conditions for transient or dynamic operation), please refer directly to the "Electrical Characteristics" table in the datasheet.
Check datasheet for other interface requirements.
Add level shifters if interfacing with different VCC.
Ensure correct power decoupling for VCC.
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please explain what U1 does.
hasofukirsch

hasofukirsch

@copilot please explain what U1 does.
11mo

copilot

The component U1 in your project is a NOR flash memory chip, specifically, the W25Q128JVSIQ from Winbond Electronics. Here is a breakdown of what it does and its key features:
  • Memory Size and Format: It has a memory size of 128 Mbit and uses a FLASH memory format. This type of memory is non-volatile, meaning it retains data even when powered off.
  • Memory Interface: It supports SPI (Serial Peripheral Interface) - Quad I/O, QPI (Quad Peripheral Interface), and DTR (Double Transfer Rate) modes, allowing for efficient data transfers.
  • Operating Voltage: The chip operates within a voltage range of 2.7V to 3.6V, with a typical operating voltage being around 3.3V.
  • Clock Frequency: It can operate with a clock frequency of up to 133 MHz, making it suitable for applications requiring fast data access and storage.
  • Temperature Range: It's designed to operate within temperature ranges from -40°C to 85°C, making it suitable for industrial and consumer environments.
  • Applications: Common uses include data storage for embedded systems, IoT devices, and various consumer electronics where reliable, fast-read access to data is required.
  • Compliance: The component complies with REACH regulations, ensuring it meets certain environmental standards.
In your project, it serves as the primary storage unit for the External Flash Module, designed for efficient data storage and retrieval in embedded and IoT systems.
11mo
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C1
Capacitance
100n F
EXTERNAL FLASH CIRCUIT
QSPI_SCLK
R2
Resistance
10k Ω
QSPI_SD1
100nF capacitor must be close to U1
QSPI_SD0
QSPI_SS
3V3
QSPI_SD3
GND
3V3
QSPI_SD2
R1
Resistance
1k Ω
3V3
U1
QSPI_SCLK
QSPI_SS
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External Flash Module thumbnail
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