designing type-c + pd systems - universal serial · pdf file · 2017-11-15designing...

USB Developer Days – October 24-25, 2017 USB Implementers Forum © 2017

Designing Type-C + PD Systems

Gregory Watkins – Texas Instruments

USB Developer Days 2017

Taipei, Taiwan

October 24-25, 2017

1

Welcoming Slideshow 1.ppsx


Agenda

• System Components

• Data Switching

• Power Switching

• System Examples

2


Agenda


• Data Switching

• Power Switching

• System Examples

3


System Components

• Type-C + PD System Primary Components

• System Components Visualized

4


Type-C + PD System Primary Components • PD Controller

• Implements Type-C state machines

• Implements PD physical layer, protocol layer, policy engine, and/or policy manger

• Can be split between a front-end and micro (TCPCI)

• Power Switching • Provides power protection required by PD standard

• Isolates source path from sink path

• Data Switching • Provides orientation support for data lines

• Multiplexes alternate mode signals

5


System Components Visualized

6

Variable

DC2DC

USB 3.1

Mux

USB 3.1

Sig Con

CC/HS

ESD

Short to

VBUS

Protection

SS ESD

Alt. Mode

Sig Con

Alt. Mode

Mux

Reverse

Current

Protection

IEC/UL

Over

Current

VBUS

Discharge

Over

Voltage

Power

Mux

Dead

Battery

LDO

VBUS

FET

VBUS

FET Drive

Thermal

Shutdown

VCONN CC

Detect/Flip

PD PHY

Modem

PD

Manager

MCU

USB 2.0

Mux

USB 2.0

Endpoint

VB

US

CC

S

BU

R

X2/T

X2

D+

/D-

VC

ON

N

RX

1/T

X1


System Components Example - TPS65981

7

Variable

DC2DC

USB 3.1

Mux

USB 3.1

Sig Con

CC/HS

ESD

Short to

VBUS

Protection

SS ESD

Alt. Mode

Sig Con

Alt. Mode

Mux

Reverse

Current

Protection

IEC/UL

Over

Current

VBUS

Discharge

Over

Voltage

Power

Mux

Dead

Battery

LDO

VBUS

FET

VBUS

NFET

Drive

Thermal

Shutdown

VCONN CC

Detect/Flip

PD PHY

Modem

PD

Manager

MCU

USB 2.0

Mux

USB 2.0

Endpoint/

HUB

TPS65981/I - USB Type-C Port Power Switch with

USB-PD Controller & HS Mux

• Supports all Type-C High Current Modes – Integrated Port Power Switches up to 20V @ 3A

– Supports bi-directional external power NMOS FETs

• Fully compliant USB PD Baseband modem per USB PD2.x – BMC encoder/decoder

– Physical Layer with CRC

– Policy and Policy Engine

• Performs all CC pin functions – Cable Detection and Cable Orientation

• Integrated HS Mux & USB 2.0 Endpoint – CC/2, SBU1/2, USB TP/TN, USBBP/BN

– Support for Guest Port Protocols

• Display Port

• Flexible system interfaces – I2C Slave/Master, SPI, Simple connection to HD3SS460 SS Mux for Display

Port/USB3.0

• Easy to use 8x8mm 56pin QFN

• Commercial (-40 to 85) and Industrial (-40 to 105) temp ranges

• Easy to use 8x8mm 56pin QFN

x2

Variable

DC2DC

VB

US

CC

S

BU

R

X2/T

X2

D+

/D-

VC

ON

N

RX

1/T

X1

USB Developer Days – October 24-25, 2017 USB Implementers Forum © 2017 8

USB Type-CTM & Power Delivery DisplayPort & USB Systems DP/USB Host (2 Port) Design

DP/USB Host Supports • USB3.1 Gen1/2 (Host) • DisplayPort (DFP_D) • SS Mux Needed


Agenda


• Data Switching

• Power Switching

• System Examples

9


Data Switching • Super Speed Mux

• Data Mux

• Alternate Mode Mux

10


Super Speed Mux (USB3.1 mux) • Provides orientation flip for Type-C receptacles

• Orientation control is not needed for direct connect or captive cable applications

• Provides source multiplexing for alternate modes (DP vs. USB)

• May be integrated into USB Host controller

11


Data Mux (USB2 Mux) • Only needed for very specialized applications that split top and

bottom D+/D- for alternate mode use

• Orientation control is handled without a mux by shorting top and bottom D+/D- together in the receptacle

12


Alternate Mode Mux (SBU Mux) • Provides SBU isolation when not operating inside an alternate mode

• Once an alternate mode is entered connects the appropriate alternate mode signals to the SBU pins based on orientation

• Typically integrated alongside the SS Mux

13


Agenda


• Data Switching

• Power Switching

• System Examples

14


Power Switching

• Power Switching Considerations

• Power Switch Architectures

• Screwdriver Test

• Reverse Current Protection

15


Power Switching Considerations • Cost

• Board Area

• Protection Features • Over Current

• Over Temperature

• Over Voltage

• Reverse Current Protection

• Fault Reporting • PD3 introduced the Alert message which requires knowledge of why a Hard

Reset occurred

16


Power Switch Architectures

Discrete Paths External Load Switches Integrated Load Switches

20 V Load Switch

20 V Load Switch

Charger

5 V Supply

VBUS

Charger

5 V Supply

VBUS 20 V Load

Switch

20 V Load Switch

Charger

5 V Supply

VBUS

PD Controller

PD Controller

PD Controller


PMOS Source Path: Screwdriver Test

• 100mΩ “screwdriver” short on VBUS

• 1000uF cap on 5V supply

• Combination of capacitance and 22k resistor means >100us to turn off the gate in event of a hard short

Sims using Si7997DP

MIN(P5V)=2.4V

5V supply brownout

Turnoff > 150us


Integrated Power Paths: Screwdriver Test

No Brownout

5x lower cap

DC / DC

PD Controller

VBUS PPHV = 5 V

SYSPWR

ON

OFF

200 uF


PMOS Path: No Reverse Current Protection

• VBUS ramp from 5V to 20V at USBC maximum rate of 30mV/us

• Combination of capacitance and 22k resistor means >100us to turn off the gate during ramp

• Nearly unbounded peak currents

• 8300 microCoulombs of reverse charge

• Would increase 1mF cap on P5V from 5V to 13.3V

Sims using Si7997DP

8300μC


Integrated Power Paths: RCP

No back-feeding of voltage Seamless transition between power sources

DCDC

VBUS

SYSPWR

OFF

PD Controller

ON w / RCP

OFF

VBUS

PPHV

120 uF

DCDC PPHV

120 uF

SYSPWR

ON w / RCP

EVM # 1

EVM # 2

20 V PD

Adapter

5 V PD

Adapter

PD Controller


Test Setup: Constant Power Load (DC/DC @ 60W)

• SYSPWR loaded by a DC/DC • DC/DC is loaded with constant 5A E-load at 12V output (60W)

• Load switch fast RCP recovery circuit kicks in at SYSPWR=15V • System performance is limited by 15V adapter on VBUS

60uF

12V @ 5A

15 V 20 V DCDC

SYSPWR

PD Controller

ON w / RCP

OFF

VBUS

PPHV

120 uF

DC / DC

USB Developer Days – October 24-25, 2017 USB Implementers Forum © 2017 23 23

VBUS is 15V

SYSPWR transitions from 20V to 15V

load changes from iSYSPWR to iVBUS

System power is always maintained

Note: current is higher on VBUS than SYSPWR due to constant power load from DC/DC

Loading DC/DC outputting 12V with 5A

SYSPWR Cap = 60uF


Agenda


• Data Switching

• Power Switching

• System Examples

24


System Examples

• USB Type-C & Power Delivery 3.0 Dual Port Host System

• USB Type-C & Power Delivery 3.0 Multiport Dongle

25


• USB Type-C & PD Full Featured Plug • DisplayPort & USB3 Device • Bi-directional Power (up to 20V / 3A)

• USB Type-C & PD Receptacle • USB3.0 Host • PD Sink up to 20V @ 3A

• USB PD3.0 Fast Role Swap Capable • Dynamic Power Advertisement w/ Bi-Directional Power • Video (up to 4K) via HDMI 2.0

PD Controllers’ dynamic and bi-directional power simplifies the system design when implementing USB PD3.0 PD Power Rules and Fast Role Swap

Power architecture ensures that the system supplies suppling data path will stay active during a Fast Role Swap

Features Benefits

USB Type-CTM & Power Delivery 3.0 Multiport Dongle TIDA-03027

System Level View

PD Controller

TI PWR HUB

DP to HDMI

USB Output

PD Controller

USB –C Output

HDMI Output

MUX

• Device Datasheets: ‒ TPS65983

‒ TUSB8041

‒ HD3SS3312

‒ TPD8S300

‒ LM3489

‒ TPS2500

‒ TPS54334

‒ TPS62065

‒ TPD13S523

‒ TPD1E01B04

http://www.ti.com/product/TPS65983?keyMatch=tps65983&tisearch=Search-EN-Everything

http://www.ti.com/product/TUSB8041?keyMatch=tusb8041&tisearch=Search-EN-Everything

http://www.ti.com/product/TPD8S300

http://www.ti.com/product/LM3489?keyMatch=lm3489&tisearch=Search-EN-Everything


USB Type-CTM & Power Delivery 3.0 Multiport Dongle Basic operation and use case


USB Type-CTM & Power Delivery 3.0 Multiport Adapter Bus-powered and self-powered operation

To meet PDP (Power Delivery Power) rules 5V/9V/15V/20V should be supported when providing power


USB Type-CTM & Power Delivery 3.0 Multiport Adapter Data and power path diagram


USB Type-CTM & Power Delivery 3.0 Multiport Adapter Bus-powered and self-powered


• System supplies must stay operational during (FRS) Fast Role Swap

• 5V USB Type-A VBUS

• 1.2V/3.3V USB Hub & DP to HDMI Supplies

• System supplies must handle low voltage and high voltage input

• Low voltage (bus-powered) down to 4V

• High voltage (self-powered) up to 21V

• System rail must have enough capacitance to support up to 3A during FRS

• 20V to 5V decay should be at least 5ms for CC signaling FRS messaging

• At ~3A around 600uF of bulk cap is needed

• PD power path must be bi-directional

• The dongle will be the “old source new sink” for a FRS

• The power path must be enabled to allow the “old sink new source” to power the dongle

USB Type-CTM & Power Delivery 3.0 Multiport Adapter Fast Role Swap Design Considerations


Q&A

35

designing type-c + pd systems - universal serial · pdf file · 2017-11-15designing...

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