TUSB422 USB Type-C 控制器技术规格

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"TI-TUSB422是一款USB Type-C端口控制器，专为支持USB Type-C 1.2规范和电源供电（PD）规范而设计。该器件集成了USB PD物理层，支持I2C接口（TCPCI），适用于自主双角色端口（DRP）的应用。TUSB422可以软件配置为专用主机、专用设备或同时扮演两者角色，能够处理下行数据端口（DFP）、上行数据端口（UFP）和双角色端口的操作。此外，它具备连接/断开USB端口、电缆方向检测、电流模式通告与检测、调试和音频附件支持、有源电缆检测以及为有源电缆提供VCONN的功能。" TI-TUSB422是德州仪器（TI）推出的一款高性能USB Type-C端口控制器，主要特点包括： 1. **USB Type-C 1.2和USB PD规范支持**：TUSB422遵循USB Type-C 1.2标准，兼容电源供电（PD）协议，可处理高达24V的拉灌电压，满足不同功率需求。 2. **I2C接口与USB PD物理层**：通过I2C接口（TCPCI）实现USB PD通信，支持5V至24V的电压范围和2.5W的VCONN开关，还支持交替模式协商，允许设备在不同USB Type-C功能间切换。 3. **自主双角色端口优化**：TUSB422设计用于支持DRP，可根据软件配置作为专用主机、专用设备或同时执行两者功能，灵活适应各种应用场景。 4. **端口管理功能**：能检测和控制USB端口的连接和断开，判断电缆方向，通告和检测电流模式，支持调试和音频附件，并具备有源电缆检测功能。 5. **VCONN与电池支持**：为有源电缆提供VCONN电源，同时支持电量耗尽的电池，确保设备在低电量状态下的稳定运行。 6. **安全与保护**：集成过热检测二极管（OTSD）以确保设备在高温环境下安全运行，还具备VBUS检测与放电控制功能，保护电路不受损害。 7. **电源电压范围广**：工作电压范围为2.7V至5.5V，适合多种电源环境。 8. **低功耗设计**：在保持高效性能的同时，实现低电流消耗，延长设备电池寿命。 9. **工业级温度范围**：可在-40°C至85°C的温度范围内正常工作，适应各种气候条件。应用领域广泛，包括但不限于智能手机、平板电脑、笔记本电脑、台式机、墙式充电器和移动充电设备等。TI-TUSB422结合其丰富的功能和特性，为USB Type-C接口设备提供了全面的解决方案。

TUSB422

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ZHCSFQ2C –NOVEMBER 2016–REVISED JUNE 2018

7.3.3 DFP (Downstream Facing Port)

The TUSB422 can be used in applications in which USB devices are connected too. For example, in a desktop

application the Type-C port(s) must be able to determine when a device is attached and enable both power (in

the form of VBUS) and datapath (either USB data and/or Alternate Mode data like DisplayPort) to attached

device. The TUSB422 can be used in a DFP application by programming the Role Control register to 0x05. This

presents Rp on both of TUSB422 CC pins. When configured as a DFP, the TUSB422 can be used to control the

sourcing of VCONN. Control of VBUS source path must be handled outside of the TUSB422.

Upon enabling TUSB422 for DFP, the TUSB422 will continuously monitor both CC1 and CC2 for a connection.

After a connection has been determined, the TUSB422 will notify system of event by asserting the INT_N pin

low. Upon detecting assertion of INT_N, the external microprocessor should read and clear the appropriate Alert

registers.

The following steps are for initialization of the TUSB422 for DFP operation.

1. Upon TUSB422 power-up, the Power Status flag in Alert Register should get set indicating TUSB422 is

initialized. When set, this flag will cause the INT_N pin to be assert low.

2. SW read the Alert Registers to determine reason for INT_N assertion. The expectation is Power Status bit

(Reg10h bit 1) is set.

3. SW read Power Status register and notice that TCPC_INIT_STATUS flag is cleared. This indicates TUSB422

is ready.

4. SW clear Power Status bit in Alert register by writing a 1’b1 to the bit.

5. Program the TUSB422 to present Rp on both CC pins. This is done by writing 0x05 to the Role Control

0x25 for 3 A current advertisement

6. Write Look4Connection command to the Command register.

7. The TUSB422 now presents Rp on both CC pins and look for a connection.

注注

Because TUSB422 supports Dead Battery Mode, a dedicated DFP application (like a Car

Charger) which uses the TUSB422 should incorporate a diode in the source power path

circuitry to block VBUS from being received by another attached DFP/DRP that is

providing VBUS.

7.3.4 UFP (Upstream Facing Port)

A UFP is a port that will present Rd on its CC pins and sink VBUS. The TUSB422 functions as a UFP by

programming the Role Control register to 0x0A. This will cause TUSB422 to present a Rd on both CC pins.

The following steps are for initialization of the TUSB422 for DFP operation.

1. Upon TUSB422 power-up, the Power Status flag in Alert Register should get set indicating TUSB422 is

initialized. When set, this flag will cause the INT_N pin to be assert low.

2. SW read the Alert Registers to determine reason for INT_N assertion. The expectation is Power Status bit

(Reg10h bit 1) is set.

3. SW read Power Status register and notice that TCPC_INIT_STATUS flag is cleared. This indicates TUSB422

is ready.

4. SW clear Power Status bit in Alert register by writing a 1’b1 to the bit.

5. Program the TUSB422 to present Rd on both CC pins. This is done by writing 0x0A to the Role Control

6. Write Look4Connection command to the Command register.

7. The TUSB422 now presents Rd on both CC pins and look for a connection.

TUSB422

ZHCSFQ2C –NOVEMBER 2016–REVISED JUNE 2018

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7.3.5 DRP (Dual-Role Port)

A Dual-Role port functions as both a DFP and a UFP. The TUSB422 supports DRP either autonomously or

manually. In autonomous DRP mode, the TUSB422 state machine toggles between UFP (Rd) and DFP (Rp) on

both its CC pins. Autonomous DRP is enabled by programming Role Control register to 0x4A and writing

Looking4Connection command to the Command register. Manual mode is under complete control of external

processor. External processor must toggle between writing 0x0A and 0x05 to Role Control register at interval

defined by Type-C specification summarized in 表 2.

表表 2. USB Type-C DRP Toggle Requirements

PARAMETER MIN MAX DESCRIPTION

DRP

50 ms 100 ms

The period a DRP shall complete a Source (Rp) to Sink (Rd) and back

dcSRC.DRP 30% 70% The percent of time that DRP shall advertise Source (Rp) during t

DRP

The following steps are for initialization of the TUSB422 for DRP operation.

1. Upon TUSB422 power-up, the Power Status flag in Alert Register should get set indicating TUSB422 is

initialized. When set, this flag will cause the INT_N pin to be assert low.

2. SW read the Alert Registers to determine reason for INT_N assertion. The expectation is Power Status bit

(Reg10h bit 1) is set.

3. SW read Power Status register and notice that TCPC_INIT_STATUS flag is cleared. This indicates TUSB422

is ready.

4. SW clear Power Status bit in Alert register by writing a 1’b1 to the bit.

5. Program the TUSB422 to present Rd on both CC pins. This is done by writing 0x4A to the Role Control

6. Write Look4Connection command to the Command register.

7. The TUSB422 now presents Rd on both Rp pins and look for a connection.

The TUSB422 autonomously toggles between Rd and Rp according to the setting of the CC General Control

value before performing Step 6.

7.3.6 Type-C Current Mode Advertising

Once a valid cable detection and attach have been completed, the TUSB422 has the option to advertise thru

CC1/CC2 pins the level of Type-C current a UFP can sink. The TUSB422 supports all three possible Type-C

current options: Default (500 mA / 900 mA), Medium(1.5 A), and High (3 A). The current advertisement used by

TUSB422 is determined by the value programmed in the Role Control register.

注注

must be greater than 3.0 V to advertise 3 A current.

7.3.7 VBUS Source Enable/Disable Control

The TUSB422 is unable to directly control VBUS enable due to no GPIO support. For this reason, external

microprocessor must directly control the Vbus enable. If it wishes, the external microprocessor may notify the

TUSB422 when Vbus has been enable/disabled, or raised above vSafe5V value. Notification to TUSB422 comes

in the form of writing to the Command register any of the following commands: SourceVbusDefaultVoltage (that

is, vSafe5V enable), SourceVbusHighVoltage (that is, greater than vSafe5V), or DisableSourceVbus. If these

commands are issued to the TUSB422, the TUSB422 ignores these commands.

7.3.8 VBUS Sink Enable/Disable Control

The TUSB422 cannot directly control VBUS Sink path, and therefore; VBUS sink path control is handled

externally. Software may write the SinkVbus command to TUSB422 Command register, but the TUSB422

ignores this command.

TUSB422

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ZHCSFQ2C –NOVEMBER 2016–REVISED JUNE 2018

7.3.9 VBUS Monitoring

One of the features of USB PD is the ability to raise VBUS above the default vSafe5V level. The ability to monitor

the VBUS voltage level is critical to determining when VBUS is at desired level as well as when VBUS is no

longer present. The TUSB422 implements measuring of VBUS and the results are stored in the VBUS Voltage

Power Control register.

7.3.10 VBUS Discharge

The TUSB422 implements internal VBUS discharge. The TUSB422 can be setup to discharge VBUS

automatically based on Type-C conditions or software can force a VBUS discharge by setting the

FORCE_DISCHARGE bit in the Power Control register.

The TUSB422 cannot directly control the enable of external VBUS switch. Therefore, software must disable

VBUS switch before or immediately after discharge of VBUS is required.

The TUSB422 meets the USB PD standard with a bulk capacitance defined by C

(BULK_SRC)

. If bulk capacitance

greater than C

(BULK_SRC)

is required, then external VBUS discharge must be used. If an external VBUS discharge

is desired, the TUSB422 internal VBUS discharge circuit can be disabled by setting the INT_VBUSDIS_DISABLE

bit in the VBUS and VCONN Control register.

7.3.11 VBUS to CC Short Detection from Legacy Charger

A legacy Type-A charger will always have VBUS active. When customer plugs a Type-A to Type-C cable into

both charger and TUSB422, the TUSB422 immediately detects Rp and then detects VBUS. If for some reason,

there is a short between VBUS and CC, the TUSB422 the CC pin is exposed to VBUS voltage. The TUSB422

implements a detection of VBUS to CC short by monitoring voltage level on each the CC pin. If the initial voltage

is above 3.5 V and TUSB422 is presenting Rd, then the TUSB422 will set the CC_FAULT status flag. The

TUSB422 keeps the CC1_STATE and CC2_STATE flags in the open state. This indicates a invalid connection

exist and user should be notified. The TUSB422 continues to look for a valid connection. Once user removes the

fault condition (for example, selects a new cable), the TUSB422 indicates a valid connection by updating

CC1_STATE and CC2_STATE to appropriate value.

7.3.12 VBUS Power Source Requirements

The TUSB422 is a Source if MESSAGE_HEADER_INFO POWER_ROLE = 1. As outlined in the USB TCPCi

specification, the TUSB422 when operating as a source discharges VBUS under any of the following conditions

when Auto Discharge (AUTO_DISCHARGE_DISCONNECT = 1) is enabled.

• Disconnect (Removal of Rd by port partner) is detected. The TUSB422 discharges VBUS to vSafe0V.

• Upon setting Force Discharge bit, the TUSB422 discharges VBUS to either vSafe0V or to the voltage

specified by VBUS Stop Discharge register.

The TUSB422 does not automatically discharge VBUS upon reception of a Hard Reset.

7.3.13 VBUS Power Sink Requirements.

The TUSB422 is a Sink if MESSAGE_HEADER_INFO POWER_ROLE = 0. As outlined in the TCPC

specification, the TUSB422 when operating as a sink must discharge VBUS to vSafe0V under any of the

following conditions when Auto Discharge (AUTO_DISCHARGE_DISCONNECT = 1) is enabled.

• If VBUS present detection is enabled and VBUS Sink Disconnect Threshold register is zero and VBUS

present bit in the Power Status register transitions from a 1 to 0.

• VBUS crosses the threshold programmed in the VBUS Sink Disconnect Threshold register.

TUSB422

ZHCSFQ2C –NOVEMBER 2016–REVISED JUNE 2018

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7.3.14 VCONN

VCONN is required by active cables, emarker, and VCONN powered accessories like Alt Mode adapters. These

types of devices or cables present Ra on one CC pin and Rd on the other CC pin. VCONN must be enabled

when any of device or cable requiring VCONN is connected to a Type-C port and the TUSB422 is operating as a

DFP or DFP in DRP mode. Software can also enable the VCONN switch when the TUSB422 is a UFP during a

VCONN_SWAP sequence. The TUSB422 implements a VCONN switch which is controlled by software. The

default state of this switch is open. By setting the ENABLE_VCONN bit in Power Control register, the TUSB422

removes closes the switch resulting in VCONN power to be connected to the CC pin indicated by value of

PLUG_ORIENTATION bit in TCPC Control register.

Once the VCONN switch is closed, the switch can be opened by any of the following conditions.

• Software clear ENABLE_VCONN bit in Power Control register.

• VCONN overcurrent fault condition occurs resulting in TUSB422 opening VCONN switch and setting the

VCONN_OCP_FAULT_STATUS bit in Fault Status register.

• Over temperature condition detected by TUSB422. Must be enabled in OTSD Control register.

• Hard Reset ordered set is received.

• Cable is removed (Rd no longer present) results in TUSB422 opening VCONN switch and discharging

VCONN to vSafe0V

The TUSB422 discharges VCONN to vSafe0V by enabling Rd at designated CC pin anytime the VCONN switch

transitions from closed to open state. Once at vSafe0V, the TUSB422 disables the discharge circuit by removing

Rd and then re-enable Rp (assuming it is still enabled in Role Control register).

If an external VCONN discharge is desired, the TUSB422 internal VCONN discharge circuit can be disabled by

setting the INT_VCONNDIS_DISABLE bit in the VBUS and VCONN Control register.

Before closing the VCONN switch, the TCPM must make sure the voltage on VCONN pin is at a valid level.

When opening the VCONN switch by clearing the ENABLE_VCONN bit, the TCPM software must make sure

voltage on VCONN pin is at valid level until after VCONN switch is opened and then, if desired, can remove the

voltage from the VCONN pin. Removing the voltage on VCONN pin before Vconn switch is opened will result in a

false VCONN fault condition.

7.3.15 Interrupts

The TUSB422 asserts the INT_N pin low anytime an unmasked event occurs. Upon assertion of the interrupt, the

TCPM should read the Alert Registers to determine the reason for interrupt. Upon reading the Alert register, the

TCPM should clear the interrupt by writing a 1’b1 to the appropriate field in the Alert register.

If the FAULT flag is set in the Alert register, the TCPM must first read the Fault Status register to determine

reason for fault. Then clear the appropriate field in the Fault Status register by writing a 1’b1. Once all fields in

Fault Status register are cleared, the TCPM can then clear the flag in the Alert Register by writing a 1’b1.

The TUSB422 also has Vendor Defined Interrupt registers which is not part of the USB TCPC specification.

These vendor defined interrupts are masked by default. Software can enable vendor interrupts by setting the

appropriate bit in the Vendor Interrupts Mask Register and setting the VENDOR_IRQ_MASK field in the Alert

Mask register.

7.3.16 Fast Role Swap

The TUSB422 supports Fast Role Swap TX as defined in the USB Power Delivery 3.0 specification. The

TUSB422 does not support Fast Role Swap RX function.

The TUSB422 can also transmit a FastRole swap pulse. This is done by writing a 1’b1 to the

TX_FAST_ROLE_SWAP bit in the PHY BMC TX Control register. Upon setting this bit, the TUSB422 generates

a FastRole swap pulse as defined by T

FRSWAPTX

parameter. The TUSB422 clears the TX_FAST_ROLE_SWAP

bit after it has completed the transmission.

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