Infineon Technologies CYPD3123-40LQXIT

Overview

CYPD3123-40LQXIT from Infineon Technologies (formerly Cypress Semiconductor) is a USB Type-C and Power Delivery (PD) port controller IC with integrated ARM® Cortex®-M0 processor (48 MHz), 128-KB flash, 8-KB SRAM, dual VBUS gate drivers, hardware crypto engine, and ±8-kV IEC61000-4-2 ESD protection on CC/SBU/DP/DM/VBUS pins. It supports full USB PD 3.0, BMC transceivers, FRS, VCONN switching, and operates across –40 °C to +105 °C in 40-pin QFN package for notebook docking stations.

For engineers reviewing the CYPD3123-40LQXIT datasheet, CYPD3123-40LQXIT pinout, CYPD3123-40LQXIT application, or CYPD3123-40LQXIT equivalent, key selection criteria include integrated PD 3.0 BMC PHY, dual 20-V-tolerant gate drivers for external VBUS FETs, hardware-based OCP/OVP, configurable RA/RP/RD terminations, and support for DisplayPort AUX/SBU routing via analog crossbar.

Technical Context

The CYPD3123-40LQXIT implements a dedicated USB-PD subsystem with Biphase Mark Coding (BMC) transceiver supporting Fast Role Swap (FRS) transmit/detect, programmable pull-up/pull-down resistors (RP/RD/RA), and integrated VCONN FETs with leakers for cable power management. Its analog crossbar enables dynamic SBU1/SBU2 ↔ AUX_P/AUX_N remapping to support DisplayPort sideband signaling.

It integrates two 8-bit SAR ADCs with internal bandgap reference, comparator, and DAC for charger detection (BC1.2/proprietary), current sense amplification, and voltage monitoring. The 48-MHz Cortex-M0 CPU executes PD policy engine firmware with hardware crypto acceleration for AES/SHA/CRC, enabling secure firmware updates and authentication in trusted ecosystems.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), thermally enhanced, RoHS-compliant, industrial temperature range (–40 °C to +105 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STUSB4500QTR and TPS65987DRLR, CYPD3123-40LQXIT provides full self-contained PD policy execution, field-upgradable firmware, and hardware crypto - eliminating external MCU dependency and enabling secure, vendor-agnostic USB-C implementations.

Availability

CYPD3123-40LQXIT is available at Aetrix Electronics and suitable for USB-C docking stations, notebook power adapters, USB-C monitors, and active cable repeaters requiring stable component supply, industrial temperature operation, and long-term lifecycle support.

Supply support for CYPD3123-40LQXIT 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive, industrial, and connectivity solutions.

CYPD3123 belongs to the EZ-PD™ CCG3 product line, designed specifically for complete, single-chip USB Type-C and Power Delivery port control in space-constrained, high-reliability endpoints such as notebooks, docks, and adapters.

FAQ

What is the maximum operating voltage on the VBUS_C pin?

The VBUS_C pin supports up to 21.5 V absolute maximum rating, with integrated overvoltage detection circuitry triggering automatic shutdown of external VBUS FETs if threshold exceeds user-programmed limit. The internal 20-V LDO regulates this input to power internal blocks, and sustained operation above 20 V requires external clamping per datasheet Section 23.

Does CYPD3123-40LQXIT support USB PD 3.0 Extended Messages?

Yes, it natively supports USB PD 3.0 Extended Messages including Battery Status, Firmware Update, and Manufacturer Information via its integrated BMC transceiver and policy engine firmware. These messages are processed in real time by the Cortex-M0 subsystem without host intervention, enabling battery telemetry and secure field updates.

Can the GPIOs operate at 1.8 V logic levels while VDDD is at 3.3 V?

Yes, the GPIO bank has an independent VDDIO supply pin allowing configurable I/O voltage from 1.71 V to 5.5 V. When VDDIO = 1.8 V and VDDD = 3.3 V, all 20 GPIOs retain full functionality including SCB peripherals, ADC sampling, and interrupt generation - verified in datasheet Table 26 and Section 7.1.

Is external crystal required for USB-PD BMC timing accuracy?

No, the CYPD3123-40LQXIT uses an integrated precision oscillator meeting USB PD BMC timing jitter requirements (<±1.5% duty cycle error). External crystals are unnecessary for PD compliance; the IMO (Internal Main Oscillator) is factory-trimmed and temperature-compensated to maintain ±0.5% accuracy across –40 °C to +105 °C.