Project Description Creation

flux

0:58

Based on the W25Q128JVSIQ datasheet, there’s no unique specification for a “USB boot CS” pin. In this datasheet, the chip select (CS) pin is described as active low. Under standard operating conditions, the CS pin is expected to be at a high level (close to the supply voltage, VCC) when it is not being driven low. Since the flash memory is designed to operate with a VCC in the range of 2.7V to 3.6V, the expected high voltage on the CS pin (when inactive) will be approximately within that range.
Thus, if you’re referring to the USB boot configuration for your application, the datasheet implies that the USB boot CS (or chip select) pin should be pulled high to the appropriate VCC level (around 2.7V to 3.6V) when not active.
For further details or any nuanced requirements, please refer directly to the datasheet sections describing the electrical interface characteristics of the CS pin.
405 days
hasofukirsch

hasofukirsch

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

flux

0:39

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.
405 days
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please explain what U1 does.
hasofukirsch

hasofukirsch

@copilot please explain what U1 does.
1y

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.
1y
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1
C1
Capacitance
100nF
EXTERNAL FLASH CIRCUIT
QSPI_SCLK
R2
Resistance
10kΩ
QSPI_SD1
100nF capacitor must be close to U1
QSPI_SD0
QSPI_SS
3V3
QSPI_SD3
GND
3V3
QSPI_SD2
R1
Resistance
1kΩ
3V3
QSPI_SCLK
QSPI_SS
U1
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External Flash Module

External Flash Module thumbnail
External Flash Module #Module The External Flash Module is a compact, high-performance circuit designed around a 128Mbit NOR flash memory, ensuring fast and reliable data storage for modern embedded systems. Integrated with precision passive components and optimized connectivity, this module offers efficient power management and seamless integration for diverse applications in IoT, industrial automation, and consumer electronics. #ExternalFlashModule #NORFlash #EmbeddedSystems #IoT #DataStorage #ElectronicsDesign

Properties

Module

Pricing & Availability

Distributor

Qty 1

Arrow

$1.12–$1.21

Digi-Key

$1.84–$2.03

LCSC

$0.52–$1.08

Mouser

$1.83

Verical

$1.46–$1.99

Controls