Not Recommended for New Designs

TUSB8040

SLLSE42I – SEPTEMBER 2010 – REVISED SEPTEMBER 2013

www.ti.com

2.3

USB Downstream Signals

Table 2-3. USB Downstream Signals

SIGNAL NAME

TYPE

PIN NO.

DESCRIPTION

USB_SSTXP_DN0

O

8

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN0

O

9

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN0

I

6

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN0

I

7

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN0

I/O

2

USB high-speed differential transceiver (positive)

USB_DM_DN0

I/O

3

USB high-speed differential transceiver (negative)

USB port 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:

0 = Battery charging not supported

PWRON0z_BATEN0

I/O, PD

39

1 = Battery charging supported

The TUSB8040PFP only supports ganged mode. This terminal provides the port power

control for all downstream ports. This terminal also determines the battery charging

support of all downstream ports.

USB downstream port over-current detection.

The TUSB8040PFP only supports ganged mode. This terminal receives the over-current

indication for all downstream ports.

0 = An overcurrent event has occurred

OVERCUR0z

I, PU

40

1 = An overcurrent event has not occurred

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_DN1

O

55

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN1

O

56

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN1

I

53

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN1

I

54

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN1

I/O

60

USB High-speed differential transceiver (positive)

USB_DM_DN1

I/O

59

USB High-speed differential transceiver (negative)

USB_SSTXP_DN2

O

14

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN2

O

15

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN2

I

12

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN2

I

13

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN2

I/O

17

USB High-speed differential transceiver (positive)

USB_DM_DN2

I/O

18

USB High-speed differential transceiver (negative)

USB_SSTXP_DN3

O

49

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_DN3

O

50

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_DN3

I

47

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_DN3

I

48

USB SuperSpeed receiver differential pair (negative)

USB_DP_DN3

I/O

45

USB High-speed differential transceiver (positive)

USB_DM_DN3

I/O

44

USB High-speed differential transceiver (negative)

10

PIN DESCRIPTIONS

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