As a more advanced physical interface, USB Type-C can provide a variety of control and transmission channels under full-featured full PIN (24PIN). With the cooperation of PD protocol, power negotiation and interface working mode negotiation can be carried out, thus enabling the corresponding channel functions. The Type-C DP ALT mode is accomplished through the negotiation process of USB PD protocol, which uses the protocol interaction of VDM in PD protocol to allow connected devices to access data transfer functions such as DP.

UM3506 series of Unicmicro is a USB PD/Type-C interface controller chip that supports the latest USB PD3.1 protocol and DP ALT mode, making it ideal for versatile Type-C interface solutions such as notebooks, docking stations, AR/VR devices, displays, etc. Adopting flexible and programmable architecture combining software and hardware and an internal TCPM/TCPC layered architecture, UM3506 integrates a native TCPC-like front-end module, high-performance 32-bit RISC-V core, large-capacity Flash memory, SRAM memory, enhanced peripheral interfaces and rich system resources, greatly facilitating the secondary development by customers.

Block Diagram
Features & Benefits

UM3506-based DP ALT system solution specification:

USB C1 reverse charging port

PD3.0/3.1 140W SINK

I2C communication

USB C2 supporting full-featured interface

PD source 65W


2-/4-lane DP transmission mode, 8-K HDR video transmission

AUX 1/2

HPD detection

DP native interface

Software platform configuration in UM3506 system solution:

FreeeRTOS embedded open source operating system

Full-featured PD library

Open-source DP ALT protocol library

Flexible and easy-to-use CLI user interface

Eclipse-based IDE

Key product recommendation

Unicmicro (Guangzhou) Co., Ltd. focuses on the industries such as new energy, inverter motor control, low-power IoT and automobile electronics, providing customers with differentiated microcontroller chips, fast charging and digital power management chips, analog and RF front-end chips, as well as innovative solutions regarding low-power IoT, digital power and motor control.

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