TypeC to DP video output module

Based on CH543 USBC AltMode mode, PD protocol communication verification.

When the normal application is based on the female socket of TypeC, the MUX chip is required for switching, based on this, there are the following two application methods:

1 Type-C to DP interface

The TypeC female terminal uses 4 sets of differential data pairs for the DP interface, that is, the 4lane DP port in daily use, that is, the way this open source solution is used, and the D+D- of USB2.0 is used to update the firmware data online, and there is no elimination.

2 Type-C to DP+USB port

The TypeC female terminal uses two sets of differential data pairs for the DP interface, and the other two pairs are used for USB 3.0 data cables SSRX and SSTX. However, the 2lane DP is inconvenient to use the large DP terminal for 2lane output, and can be converted to EDP interface output (not made).

3 Introduction to CH9445

● 4:4 or 4:6 cross-channel ultra-high-speed differential signal MUX switch.
● Support USB3.1 10Gbps signal.
● Support DP1.4 8Gbps signal.
● Provide cross-switching circuitry for CSBU and SBU pins.
● Control and configure multi-channel MUX switching via I2C two-wire interface.
● Provide 4 GPIO pins, GPIO supports interrupts.
● Support low-power mode.

● Available in QFN32-4x4mm package.

4 Project Progress

【2023.01.11】

• [V4 Version]
• Bug, the monitor CC2 cannot communicate normally to apply for AltMode mode, but the output video of the iPad Pro11 device can be recognized by CC1 and CC2.

【2023.01.08】

• [V4 Version]
• Soldering is completed, code and equipment are tested.

【2022.12.27】

• The PCB V4 version is proofed and waiting to be looped out.

【2022.05.20】

• [V3 Version]
• It adopts HD3SS460 and supports DP1.2 bandwidth.

5 Atlas