Schematic Symbol for External Flash Module: External Flash Module...

Project Description Creation

hasofukirsch

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

316 days

flux

0:39

General (prev)

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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.

316 days

Ready.

please explain what U1 does.

hasofukirsch

@copilot please explain what U1 does.

10mo

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.

10mo

Someone is typing...

Capacitance

100n F

EXTERNAL FLASH CIRCUIT

Resistance

10k Ω

100nF capacitor must be close to U1

QSPI_SS

3V3

GND

3V3

Resistance

1k Ω

3V3

QSPI_SCLK

QSPI_SD1

QSPI_SD0

QSPI_SD3

QSPI_SD2

QSPI_SS

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper

Reports copper elements that are shorting.

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides • 8

	Designator	Ruleset
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	S＊＊	Override rule for S＊＊

Airwires • 1

	Designators	Net
	3V3:3V3, R2:P2	3V3

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number

Reports parts that have no manufacturer part number.

Parts Available

Beta

	Designator	Stock	...
	~USB_BOOT	None
	3V3	None
	GND	None
	QSPI_SCLK	None
	QSPI_SD0	None
	QSPI_SD1	None
	QSPI_SD2	None
	QSPI_SD3	None
	QSPI_SS	None
	C1	81M
	R1	3M
	R2	12M
	SW1	268k
	U1	85k

System Checks

Auto-Layout

Beta

Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

Resistor Power Rating

Beta

	Resistor	Power Rating	Power Actual	...
	R1	250.00 mW	90.00 μW
	R2	250.00 mW	36.00 μW

Pull Up/Pull Down Presence

Beta

	IC
	U1:~CS
	U1:CLK
	U1:DI(IO0)
	U1:DO(IO1)
	U1:IO2
	U1:IO3
	U1:GND
	U1:VCC

Capacitor Voltage Rating

Beta

	Capacitor	Headroom	...
	C1	1566.67%

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