TPS65982ABZBHR datasheet(37/121 Pages) TI1

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TPS65982

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SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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Feature Description (continued)

9.3.2.1 Configured as a DFP

When configured as a DFP, the TPS65982 detects when a cable or a UFP is attached using the C_CC1 and

C_CC2 pins. When in a disconnected state, the TPS65982 monitors the voltages on these pins to determine

what, if anything, is connected. See the USB Type-C Specification for more information.

Table 1 shows the high-level detection results. Refer to the USB Type-C Specification for more information.

Table 1. Cable Detect States for a DFP

C_CC1

C_CC2

CONNECTION STATE

RESULTING ACTION

Open

Nothing attached

Continue monitoring both C_CC pins for attach. Power is not applied to VBUS or

VCONN until a UFP connect is detected.

Open

UFP attached

Monitor C_CC1 for detach. Power is applied to VBUS but not to VCONN (C_CC2).

Open

UFP attached

Monitor C_CC2 for detach. Power is applied to VBUS but not to VCONN (C_CC1).

Open

Powered Cable/No UFP

attached

Monitor C_CC2 for a UFP attach and C_CC1 for cable detach. Power is not applied

to VBUS or VCONN (C_CC1) until a UFP attach is detected.

Open

Powered Cable/No UFP

attached

Monitor C_CC1 for a UFP attach and C_CC2 for cable detach. Power is not applied

to VBUS or VCONN (C_CC1) until a UFP attach is detected.

Powered Cable/UFP Attached

Provide power on VBUS and VCONN (C_CC1) then monitor C_CC2 for a UFP

detach. C_CC1 is not monitored for a detach.

Powered Cable/UFP attached

Provide power on VBUS and VCONN (C_CC2) then monitor C_CC1 for a UFP

detach. C_CC2 is not monitored for a detach.

Debug Accessory Mode

attached

Sense either C_CC pin for detach.

Audio Adapter Accessory

Mode attached

Sense either C_CC pin for detach.

When the TPS65982 is configured as a DFP, a current IH_CC is driven out each C_CCn pin and each pin is

monitored for different states. When a UFP is attached to the pin, a pulldown resistance of Rd to GND will exist.

The current IH_CC is then forced across the resistance Rd generating a voltage at the C_CCn pin.

When configured as a DFP advertising Default USB current sourcing capability, the TPS65982 applies

IH_CC_USB to each C_CCn pin. When a UFP with a pulldown resistance Rd is attached, the voltage on the

C_CCn pin will pull below VH_CCD_USB. The TPS65982 can also be configured as a DFP to advertise default

(500 mA), 1.5 A and 3 A sourcing capabilities.

When the C_CCn pin is connected to an active cable VCONN (power to the active cable), the pulldown

resistance

will

different

(Ra).

this

case,

the

voltage

the

C_CCn

will

pull

below

VH_CCA_USB/1P5/3P0 and the system will recognize the active cable.

The VH_CCD_USB/1P5/3P0 thresholds are monitored to detect a disconnection from each of these cases

respectively. When a connection has been recognized and the voltage on the C_CCn pin rises above the

VH_CCD_USB/1P5/3P0 threshold, the system will register a disconnection.

9.3.2.2 Configured as a UFP

When the TPS65982 is configured as a UFP, the TPS65982 presents a pulldown resistance RD_CC on each

C_CCn pin and waits for a DFP to attach and pullup the voltage on the pin. The DFP will pullup the C_CC pin by

applying either a resistance or a current. The UFP detects an attachment by the presence of VBUS. The UFP

determines the advertised current from the DFP by the pullup applied to the C_CCn pin.

9.3.2.3 Dead-Battery or No-Battery Support

Type-C USB ports require a sink to present Rd on the CC pin before a USB Type-C source will provide a voltage

on VBUS. The TPS65982 is hardware-configurable to present this Rd during a dead-battery or no-battery

condition. Additional circuitry provides a mechanism to turn off this Rd when the port is acting as a source.

Figure 19 shows the RPD_Gn pin used to configure the behavior of the C_CCn pins, and elaborates on the basic

cable plug and orientation detection block shown in Figure 18. RPD_G1 and RPD_G2 configure C_CC1 and

C_CC2 respectively. A resistance R_RPD is connected to the gate of the pulldown FET on each C_CCn pin.

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