CY83771
E-Marker For USB Type-C Passive And Active Cables
Description
The CY83771 is an Electronic-Marker (e-Marker) IC for applications of USB Type-C active and passive cables. It is compliant with USB Type-C Cable and Connector Specification Release 2.2, and Power Delivery PD3.1 Version 1.8. It supports temperature report and thermal shut down, and embeds VBUS-short protection on CC/VCONN1/VCONN2 pins up to 36V.
The CY83771 can be powered from VCONN1, VCONN2, or VCONNO, and operating voltage is from 2.75V to 5.75V. With the supports of structured VDM (Vendor Defined Message) command s, the CY83771-embedded cable delivers cable parameters to the PD source for decision making. It automatically supports SOP’ (cable near end - close to VCONN source), SOP” (cable far end) operations, and monitors the SOP communications between source and sink so as to enable the active cable applications through the I2C interface control.
The internal Ra resistor is turned off to save power upon completion of discovery procedure. In addition, to minimize power consumption in active cable application, the CY83771 can set the connected repeater to standby power mode.
The built-in MTP in the CY83771 can be programmed through Configuration Channel (CC) line to store cable parameters up to 4 times. To minimize total BOM cost and PCB area¸ the CY83771 has integrated LDOs, isolators (diodes) and Ra resistors. It is available in W-DFN2020-8 package.
The CY83771 can be powered from VCONN1, VCONN2, or VCONNO, and operating voltage is from 2.75V to 5.75V. With the supports of structured VDM (Vendor Defined Message) command s, the CY83771-embedded cable delivers cable parameters to the PD source for decision making. It automatically supports SOP’ (cable near end - close to VCONN source), SOP” (cable far end) operations, and monitors the SOP communications between source and sink so as to enable the active cable applications through the I2C interface control.
The internal Ra resistor is turned off to save power upon completion of discovery procedure. In addition, to minimize power consumption in active cable application, the CY83771 can set the connected repeater to standby power mode.
The built-in MTP in the CY83771 can be programmed through Configuration Channel (CC) line to store cable parameters up to 4 times. To minimize total BOM cost and PCB area¸ the CY83771 has integrated LDOs, isolators (diodes) and Ra resistors. It is available in W-DFN2020-8 package.
Features
- Compliant to USB Type-C Cable and Connector Release 2.2
- Compliant to USB Power Delivery Rev.3.1 Ver.1.8
- Support structured VDM commands including Discover Identity/SVIDs/Modes, and Enter/Exit Mode
- Support DisplayPort Alternate (Alt) mode
- Support USB4TM and TBT3TM communications
- Support Get Manufacturer Info command
- Support SOP’ and SOP” communications
- Support single and dual e-Marker cable applications
- Support active and passive cables through built-in MCU
- Support temperature report and thermal shut down
- Support 2.75V – 5.75V operation on VCONN1/VCONN2
- Support VBUS short protection on CC/VCONN1/VCONN2 up to 36V
- Support I2C master/slave and GPIO pin
- Built-in LDOs, isolators (diodes) and Ra resistors
- In-system MTP programming through CC line up to 4 times
- Current as low as 2mA and 400uA in operation and standby
- ±8 kV HBM ESD on CC, VCONN1 and VCONN2 pins
- Package: W-DFN2020-8
Pin Assignments
W-QFN3030-16 (Type A1)- Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
- Halogen and Antimony Free. “Green” Device (Note 3)
Applications
- USB Type-C Passive Cables
- USB Type-C Active Cables
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) 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®, USB-C®, and USB4TM are trademarks of USB Implementers Forum. Thunderbolt™ is a trademark of Intel Corporation
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) 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®, USB-C®, and USB4TM are trademarks of USB Implementers Forum. Thunderbolt™ is a trademark of Intel Corporation
Typical Applications Circuit
The CY83771 is a USB Type-C cable e-Marker, an element in an electronically marked cable that returns information about the cable in response to a USB PD Discover Identity command. The CY83771 is designed to detect and communicate with packets starting with SOP’ and SOP’’ commands, and monitors the SOP communications between source and sink so as to support both the passive cable and the active cable applications.
Passive Cable Application
Figure 1a and Figure 1b show the application diagrams of a passive cable using CY83771 as e-Marker. Figure 1a shows the application using a single CY83771 e-Marker on the cable, whereas Figure 1b shows the application using 2 PCS of CY83771 e-Marker on each cable.
For the passive cable application, there is no signal conditioning on the data path so that the Super-speed lines and High-speed lines go through from one plug to another. Also, for the general type-C cable, the VBUS signal, CC line, and Ground lines are connected from one end to another.
However, the VCONN wire has different scenario. For the Figure 1a, it requires a single VCONN wire to run through the cable so that the CY83771 can be powered no matter which plug is connected to the VCONN source. For the Figure 1b, the VCONN wire is only connected to the respective VCONN pin of the CY83771 at each end of the plug instead of going through the entire cable, so that only one CY83771 is powered at any given time, depending on which plug is closer to the DFP that supplies VCONN power.
Passive Cable Application
Figure 1a and Figure 1b show the application diagrams of a passive cable using CY83771 as e-Marker. Figure 1a shows the application using a single CY83771 e-Marker on the cable, whereas Figure 1b shows the application using 2 PCS of CY83771 e-Marker on each cable.
For the passive cable application, there is no signal conditioning on the data path so that the Super-speed lines and High-speed lines go through from one plug to another. Also, for the general type-C cable, the VBUS signal, CC line, and Ground lines are connected from one end to another.
However, the VCONN wire has different scenario. For the Figure 1a, it requires a single VCONN wire to run through the cable so that the CY83771 can be powered no matter which plug is connected to the VCONN source. For the Figure 1b, the VCONN wire is only connected to the respective VCONN pin of the CY83771 at each end of the plug instead of going through the entire cable, so that only one CY83771 is powered at any given time, depending on which plug is closer to the DFP that supplies VCONN power.
Figure 1a – A Passive Cable incorporates an e-Marker at Single End of the Cable
Figure 1b – A Passive Cable incorporates e-Markers at Dual Ends of the CableActive Cable Application
The main function of an active cable is to provide signal conditioning by adding a repeater (re-driver or re-timer) on the data path. The USB Power Delivery Structured Vendor Defined Messages (VDMs –SOP’ packets) are used to enable/disable the Active cables with the required configuration and signal conditioning through the CC wire.
The main function of an active cable is to provide signal conditioning by adding a repeater (re-driver or re-timer) on the data path. The USB Power Delivery Structured Vendor Defined Messages (VDMs –SOP’ packets) are used to enable/disable the Active cables with the required configuration and signal conditioning through the CC wire.
Typical Applications Circuit (Cont.)
Figure 2a and Figure 2b show the application diagrams of Active cables using CY83771 as e-Marker. Figure 2a shows the active cable application using a single e-Marker, while Figure 2b shows a dual e-Marker application.
As soon as VDM packet is decoded by the Biphase Mark Coding (BMC) transceiver, the CY83771 outputs the control message to the repeater through I2C communication. The control message includes repeater emphasis/de-emphasis, adaptive equalization, cable polarity, and data direction. In consideration of the high power consumption in active cable, temperature report and thermal shut down message are also supported. The repeater works as an I2C slave device and follow the instruction from CY83771 I2C registers.
All of the power consumption of Active Cable should be provided from VCONN, and an external diode should be connected in parallel to each VCONN pin to prevent the repeater operating current from entering the CY83771. For the case where only one repeater on the cable as in Figure 2a, the VCONN wire goes through the cable with both ends being connected to VCONN2 of the corresponding paddle card of the cable. For the case where there is a repeater on each cable plug as shown in Figure 2b, the VCONN wire is passed through the cable and is connected to VCONNO pins of CY83771 chip at both ends. When a CY83771 is powered from any one of the VCONN pins, its VCONNO is connected to the VCONNO of the other CY83771, and then both CY83771 chips are powered.
As soon as VDM packet is decoded by the Biphase Mark Coding (BMC) transceiver, the CY83771 outputs the control message to the repeater through I2C communication. The control message includes repeater emphasis/de-emphasis, adaptive equalization, cable polarity, and data direction. In consideration of the high power consumption in active cable, temperature report and thermal shut down message are also supported. The repeater works as an I2C slave device and follow the instruction from CY83771 I2C registers.
All of the power consumption of Active Cable should be provided from VCONN, and an external diode should be connected in parallel to each VCONN pin to prevent the repeater operating current from entering the CY83771. For the case where only one repeater on the cable as in Figure 2a, the VCONN wire goes through the cable with both ends being connected to VCONN2 of the corresponding paddle card of the cable. For the case where there is a repeater on each cable plug as shown in Figure 2b, the VCONN wire is passed through the cable and is connected to VCONNO pins of CY83771 chip at both ends. When a CY83771 is powered from any one of the VCONN pins, its VCONNO is connected to the VCONNO of the other CY83771, and then both CY83771 chips are powered.
Figure 2a – An Active Cable incorporates an e-Marker in Single End of the Cable
Figure 2b – An Active Cable incorporates e-Markers in Dual Ends of the Cable Functional Block Diagram
Figure 3 – Functional Block Diagram of the CY83771