CY43781
USB PD Controller Supporting Displayport-Over-Type-C Alternate Mode
Description
The CY43781 is a highly integrated USB Type-C® Power Delivery (PD) controller targeted for monitors or TV power boards with USB Type-C ports. It supports USB PD Rev3.1 V1.5 Standard Power Range (SPR) up to 100W, and Programmable Power Supply (PPS) up to 21V full range. In addition, the CY43781 implements cable-loss compensation and e-Marker detection functions.
When used in target applications for Type-C PC monitors and TV display devices, the CY43781 plays a central role of Downstream-Facing Port (DFP) charging as well as Upstream-Facing Port (UFP) data/video transfer, including Type-C-to-Type-C Mode and DisplayPort™-Over-Type-C Alternate (Alt) Mode. The CY43781 manages various parameters setting for attached I2C-slave signal controllers such as Signal Re-driver for signal condition and Signal-Cross-Bar Switch to support required DisplayPort™-to-Type-C Pin Assignment.
The CY43781 offers comprehensive safety protection schemes, including over-voltage protection (OVP), under-voltage protection (UVP), over-current protection (OCP), short-circuit protection (SCP) and/or over-temperature protection (OTP).
A one-time programmable ROM is provided for main firmware, and a multi-time programmable ROM is provided for user configuration data.
When used in target applications for Type-C PC monitors and TV display devices, the CY43781 plays a central role of Downstream-Facing Port (DFP) charging as well as Upstream-Facing Port (UFP) data/video transfer, including Type-C-to-Type-C Mode and DisplayPort™-Over-Type-C Alternate (Alt) Mode. The CY43781 manages various parameters setting for attached I2C-slave signal controllers such as Signal Re-driver for signal condition and Signal-Cross-Bar Switch to support required DisplayPort™-to-Type-C Pin Assignment.
The CY43781 offers comprehensive safety protection schemes, including over-voltage protection (OVP), under-voltage protection (UVP), over-current protection (OCP), short-circuit protection (SCP) and/or over-temperature protection (OTP).
A one-time programmable ROM is provided for main firmware, and a multi-time programmable ROM is provided for user configuration data.
Features
- Compatible with USB PD Rev3.1 V1.5
- Support SPR up to 100W and PPS up to 3.3V ~ 21V with resolution of 20mV/step in voltage and 50mA/step in current.
- Support Type-C Alternative Mode for DisplayPort™ (DP)
- Built-in regulator for CV and CC control
- Support OVP/UVP/OCP/SCP/OTP with auto restart
- Support power saving mode
- Driver for output enable N-MOS switch
- Support E-Marker cable detection
- Manage parameter setting for signal conditioning and signal routing (Cross-Bar Switches) through I2C Interface for attached I2C Slave Devices
- OTP (One-Time Programmable) for main firmware
- MTP (Multi-Time Programmable) for system configuration
- Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
- Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments

Applications
- Monitors with Type-C ports
- TV power boards with Type-C ports
- USB Type-C Power and Video Hubs
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. Please contact http://www.canyon-semi.com.tw for more information of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
USB Type-C® and USB-C® are registered trademarks of USB Implementers Forum.
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. Please contact http://www.canyon-semi.com.tw for more information of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
USB Type-C® and USB-C® are registered trademarks of USB Implementers Forum.
Typical Applications Circuit
As shown in Figure 1, a typical Type-C PD monitor usage setup includes a Type-C PD monitor (either Type-C and/or DisplayPort™ connector), a Type-C PD host (e.g. Notebook PC, Mobile phone) and various USB peripheral devices (e.g. SSD). Serving as both Power and Data hub, a Type-C monitor consists of three major functional blocks - Main Video SoC Block, USB Hub Controller Block and Type-C PD interface Module. The Type-C-Link-Monitor (CLM) module, with key controller IC components and interconnects, implements required DFP PD3.1 Charging and UFP Video/Data operations, including DisplayPort™-Over-Type-C Alternate mode.
When the Type-C attachment is completed between an active CLM module and the NB host, the power profile negotiation starts through sequence of Channel Configuration (CC) command and response exchanges. Upon successful attachment process, the power profile selection is concluded. The CY43781 enables the attached I2C buck-boost controller to output the matched power to the NB host for DFP Charging.
At the same time, the CY43781 plays as a data Upstream-Facing Port (UFP), and enter the alternative mode supporting by decode out the VDM (vendor defined message) commands on CC line delivered from NB host side. The decoded information is then sent out through I2C interface to the high speed switches (i.e. PI3USB31531) and signaling chip (i.e. PI3DPX1207C), so that the data stream can be delivered from host side to the Display Port at the right routing path and with correct signaling accordingly.
To support development-debugging purposes, the CLM module adopts I2C IO Expander chip (PI4IOE5V9554) to monitor critical signals. Furthermore, the CY43781 minimize the standby power consumption (<40mWatt) of the overall CLM module.
Note –
When the Type-C attachment is completed between an active CLM module and the NB host, the power profile negotiation starts through sequence of Channel Configuration (CC) command and response exchanges. Upon successful attachment process, the power profile selection is concluded. The CY43781 enables the attached I2C buck-boost controller to output the matched power to the NB host for DFP Charging.
At the same time, the CY43781 plays as a data Upstream-Facing Port (UFP), and enter the alternative mode supporting by decode out the VDM (vendor defined message) commands on CC line delivered from NB host side. The decoded information is then sent out through I2C interface to the high speed switches (i.e. PI3USB31531) and signaling chip (i.e. PI3DPX1207C), so that the data stream can be delivered from host side to the Display Port at the right routing path and with correct signaling accordingly.
To support development-debugging purposes, the CLM module adopts I2C IO Expander chip (PI4IOE5V9554) to monitor critical signals. Furthermore, the CY43781 minimize the standby power consumption (<40mWatt) of the overall CLM module.
Note –

Functional Block Diagram
