TUSB8040A datasheet(14/39 Pages) TI1

14 / 39 page

TUSB8020A, TUSB8040A

SLLSEA7B – MAY 2012 – REVISED AUGUST 2012

www.ti.com

2.4

USB Downstream Signals

Table 2-4. USB Downstream Signals

TUSB8040A

TUSB8020A

SIGNAL NAME

TYPE

PIN NO.

DESCRIPTION

PFP

RKM

PFP

RKM

USB_SSTXP_DN0

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN0

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN0

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN0

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN0

I/O

USB high-speed differential transceiver (positive)

USB_DM_DN0

I/O

USB high-speed differential transceiver (negative)

USB Port 0 Power On Control for Downstream Power/Battery Charging

Enable.

The terminal is used for control of the downstream power switch; in

addition, the value of the terminal is sampled at the de-assertion of reset to

determine the value of the battery charger support for the port as indicated

in the Battery Charger Support register:

I/O,

PWRON0z_BATEN0

B19

0 = Battery charging not supported

1 = Battery charging supported

This terminal provides the port power control for all downstream ports if

GANGED_SMBA2 = 1. This terminal also determines the battery charging

support of all downstream ports if GANGED_SMBA2 = 1.

USB Port 0 over-current detection.

0 = An overcurrent event has occurred

1 = An overcurrent event has not occurred

OVERCUR0z

I, PU

B21

This terminal should be pulled high using a 10-k

Ω resistor if power

management is not implemented. If power management is enabled, the

external circuitry needed should be determined by the power switch.

USB_SSTXP_DN1

B34

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN1

A37

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN1

B33

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN1

A36

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN1

I/O

B36

USB High-speed differential transceiver (positive)

USB_DM_DN1

I/O

A39

USB High-speed differential transceiver (negative)

USB Port 1 Power On Control for Downstream Power/Battery Charging

Enable. The terminal is used for control of the downstream power switch for

Port 1. In addition, the value of the terminal is sampled at the de-assertion

I/O,

of reset to determine the value of the battery charger support for Port 1 as

PWRON1z_BATEN1

N/A

A21

N/A

A21

indicated in the Battery Charger Support register:

0 = Battery Charging Not Supported

1 = Battery Charging Supported

USB Downstream Port 1 Over-Current Detection.

0 = An overcurrent event has occurred

1 = An overcurrent event has not occurred

OVERCUR1z

I, PU

N/A

A23

N/A

A23

This terminal should be pulled high using a 10-k

Ω resistor if power

management is not implemented. If power management is enabled, the

external circuitry needed should be determined by the power management

device.

USB_SSTXP_DN2

N/A

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN2

N/A

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN2

N/A

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN2

N/A

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN2

I/O

N/A

USB High-speed differential transceiver (positive)

PIN DESCRIPTIONS

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