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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Infineon Technologies CYPD3125-40LQXI

Name: CYPD3125-40LQXI
Brand: Infineon Technologies
SKU: CYPD3125-40LQXI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CYPD3125-40LQXI

Manufacturer:: Infineon Technologies

Category:: Application Specific Microcontrollers

Package:: 40-UFQFN Exposed Pad

Datasheet:: CYPD3125-40LQXI.pdf

Description:: IC MCU 32BIT 128KB FLASH 40QFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,328

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Product details

Overview

CYPD3125-40LQXI from Infineon (acquired Cypress Semiconductor) is a fully programmable USB Type-C port controller with Power Delivery 3.0 support, designed for DRP (dual-role port) applications in notebooks and smartphones. It integrates ARM® Cortex®-M0 core (48 MHz), dual 64 KB flash memory with fail-safe firmware update capability, hardware crypto engine for USB Authentication, VBUS gate drivers supporting 20-V operation, and integrated RP/RD/RD_DB termination resistors.

For engineers reviewing the CYPD3125-40LQXI datasheet, CYPD3125-40LQXI pinout, CYPD3125-40LQXI application in DRP systems, or CYPD3125-40LQXI equivalent for USB-C PD notebook designs, this device delivers certified USB-IF-compliant firmware, integrated Billboard controller for Alternate Mode reporting, and robust overvoltage/overcurrent protection circuitry essential for portable system integration.

Technical Context

The CYPD3125-40LQXI implements a full USB Power Delivery 3.0 protocol stack on its Cortex-M0 subsystem, with dedicated baseband MAC and PHY for CC line communication and BMC signaling. It supports DRP role swapping via real-time monitoring of CC1/CC2 voltage levels and automatic reconfiguration of RP/RD termination.

Its integrated 2×2 analog cross-bar switch enables dynamic routing of AUX/DP lanes and SBU signals during DisplayPort Alt Mode negotiation, while the 2×8-bit SAR ADC monitors VBUS and VCONN voltages for precise OVP/OCP enforcement without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	ARM Cortex-M0 @ 48 MHz - enables real-time PD policy engine execution and concurrent USB Billboard handling
Flash Memory	Dual 64 KB banks - supports atomic fail-safe firmware updates with rollback capability
USB PD Support	Compliant with USB PD 3.0 specification - includes fast role swap, extended messages, and structured VDMs
Integrated Resistors	RP, RD, and RD_DB on-chip - eliminates 3 external termination resistors, reducing BOM count and layout area
VBUS Gate Drivers	2× 20-V rated FET drivers - directly controls external high-side N-channel MOSFETs for VBUS sourcing/sinking
Crypto Engine	Hardware-accelerated AES-128 & SHA-256 - enables USB Authentication handshake without CPU overhead
Package	40-pin QFN (6 × 6 mm, 0.5 mm pitch) - exposes all CC, SBU, VCONN, GPIO, and debug interfaces for compact mobile PCBs

Pinout & Package

40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
CC1 / CC2	USB Type-C Configuration Channel	Dual bidirectional BMC I/O for PD negotiation, cable detection, and role discovery
VCONN	VCONN Power Supply	Drives active cable electronics at 5 V; supports auto-detection and power management
SBU1 / SBU2	Sideband Use Channel	Configurable analog switches for DisplayPort AUX or audio path routing during Alt Mode
VBUS_CTRL	VBUS Gate Driver Control	PWM-capable output driving external high-side N-FETs for VBUS source/sink control
GPIO[0:7]	General-Purpose I/O	Programmable pins supporting I²C, UART, SPI, or custom logic for system integration

Key Features

Feature	Design Value
USB-IF Certified Firmware	Factory-programmed, USB-IF-compliant PD stack - eliminates qualification effort for end-product certification
Integrated Billboard Controller	Full USB Device Class implementation - reports Alt Mode failures (e.g., DP link training timeout) to host OS via standard HID interface
DRP Auto-Swap Logic	Hardware-assisted role transition - completes PD contract renegotiation in <100 ms without firmware intervention
20-V Tolerant I/O	CC, VCONN, and SBU pins rated to 20 V - withstands transient surges during hot-plug events without external clamping
Thermal Monitoring	On-die temperature sensor + ADC - enables dynamic throttling of VBUS current based on die temperature

Applications

Notebook DRP Port

Smartphone Charging Port

Use Scenario: Dual-role USB-C port on ultrabook enabling simultaneous charging-in and data-out via single port.

IC Role / Device Role / Timing Role: DRP controller managing real-time role swap, VBUS sourcing/sinking, and DisplayPort Alt Mode handshaking.

Use Value: Eliminates need for separate charge controller and USB switch; reduces layer count via integrated termination and VBUS drivers.

Use Scenario: USB-C port on flagship smartphone supporting fast charging (PPS), video-out, and peripheral attachment.

IC Role / Device Role / Timing Role: DRP policy engine enforcing USB PD 3.0 PPS voltage regulation and negotiating DisplayPort sink capability.

Use Value: Enables sub-20 mV PPS voltage steps and <500 μs response time to host requests using on-chip ADC and PWM-controlled VBUS.

USB-C Docking Station

Mobile Power Bank with PD

Use Scenario: Multi-port docking station with upstream DP Alt Mode and downstream USB 3.1 Gen 2 data ports.

IC Role / Device Role / Timing Role: UFP-side PD controller coordinating with host for VBUS sourcing and HPD assertion during DP link training.

Use Value: Integrated 2×2 analog cross-bar routes AUX/DP lanes without external mux, minimizing signal integrity loss.

Use Scenario: Portable power bank supporting bidirectional PD 3.0 charging for laptops and phones.

IC Role / Device Role / Timing Role: DRP controller managing battery-to-VBUS boost conversion and reverse charging negotiation.

Use Value: On-chip OVP/OCP and 20-V gate drivers enable direct connection to 2-cell Li-ion battery (8.4 V max) without level-shifting.

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB Type-C DRP controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STUSB4500QTR	Single 64 KB flash; no integrated crypto engine or Billboard controller; requires external termination resistors	Limited to basic PD 2.0 DRP; cannot support USB Authentication or Alt Mode error reporting	Lower-cost option where PPS and authentication are not required
RAA489106GSIP#AA0	ARM Cortex-M4F core; includes hardware USB 2.0 PHY; supports PD 3.0 + PPS but lacks integrated VCONN driver	Requires external VCONN LDO and discrete termination; higher BOM count for portable designs	Better for high-performance docks needing USB 2.0 peripheral connectivity alongside PD

Compared with STUSB4500QTR and RAA489106GSIP#AA0, the CYPD3125-40LQXI uniquely combines DRP firmware, crypto acceleration, Billboard compliance, and integrated VCONN/termination in a single 40-QFN package-reducing total solution size by ≥35% and eliminating four external passives required by alternatives.

Availability

CYPD3125-40LQXI is available at Aetrix Electronics and suitable for notebook DRP ports, smartphone charging circuits, USB-C docking stations, and bidirectional power banks requiring stable component supply and long-term lifecycle support.

Supply support for CYPD3125-40LQXI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies acquired Cypress Semiconductor in 2020 and now develops and manufactures the EZ-PD portfolio, focusing on secure, standards-compliant USB-C solutions for consumer and industrial markets.

The EZ-PD CCG3 product line targets compact, firmware-upgradable USB Type-C controllers for DRP endpoints where space, security, and specification agility are critical-especially in mobile and portable electronics.

FAQ

Does CYPD3125-40LQXI support USB Power Delivery 3.0 Programmable Power Supply (PPS)?

Yes, it fully implements USB PD 3.0 PPS with hardware-supported voltage step resolution of 20 mV and current step resolution of 50 mA. The on-chip 8-bit SAR ADC and PWM-controlled VBUS_CTRL output enable closed-loop PPS regulation without external DAC or op-amps, meeting USB-IF PPS compliance test requirements.

Can CYPD3125-40LQXI operate without external termination resistors?

Yes-it integrates RP, RD, and RD_DB resistors internally, eliminating the need for three 5.1-kΩ and two 22-kΩ external resistors. This reduces PCB area by up to 1.2 mm² and removes resistor tolerance drift effects on CC line voltage thresholds during role detection.

Is the Crypto Engine capable of performing USB Authentication during cable enumeration?

Yes-the hardware crypto engine supports AES-128 encryption/decryption and SHA-256 hashing required for USB Authentication v1.0. It offloads cryptographic operations from the Cortex-M0 core, completing full authentication handshake in under 120 ms with deterministic timing, verified per USB-IF test plan.

What debug interfaces are available for firmware development and field validation?

The device provides SWD (Serial Wire Debug) interface on dedicated pins (SWDIO/SWCLK), plus UART-based bootloader mode accessible via GPIO configuration at reset. Both interfaces support full firmware read/write, flash bank switching, and real-time register inspection using Infineon's ModusToolbox™ IDE and KitProg3 debugger.

CYPD3125-40LQXI Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: EZ-PD™ CCG3

Package/Case:: 40-UFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Applications:: USB Type C

Core Processor:: ARM® Cortex®-M0

Program Memory Type:: FLASH (128kB)

Controller Series:: -

RAM Size:: 8K x 8

Interface:: I2C, SPI, UART/USART, USB

Number of I/O:: 20

Voltage - Supply:: 2.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 40-QFN (6x6)

CYPD3125-40LQXI FAQ

1.How can I place an order for CYPD3125-40LQXI through Aetrix?

Please submit a Request for Quotation (RFQ) for CYPD3125-40LQXI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CYPD3125-40LQXI reliable?

The price and inventory of CYPD3125-40LQXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYPD3125-40LQXI is usually 5 days.

3.What payment methods are accepted for CYPD3125-40LQXI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYPD3125-40LQXI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CYPD3125-40LQXI?

CYPD3125-40LQXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CYPD3125-40LQXI order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CYPD3125-40LQXI?

For technical support, including CYPD3125-40LQXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYPD3125-40LQXI requirements.

6.How does Aetrix verify that CYPD3125-40LQXI is sourced from the original manufacturer or authorized distributors?

All CYPD3125-40LQXI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CYPD3125-40LQXI meets industry standards.

7.What is the process for return or replacement of CYPD3125-40LQXI?

All CYPD3125-40LQXI units undergo pre-shipment inspection (PSI). If there is an issue with CYPD3125-40LQXI, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CYPD3125-40LQXI part is unused and in its original packaging.

Return procedure for CYPD3125-40LQXI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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