TUSB8020B

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SLLSEF6A – JULY 2014 – REVISED JULY 2014

Pin Functions

PIN

TYPE

(1)

DESCRIPTION

NAME

NO.

CLOCK AND RESET SIGNALS

I

Global power reset. This reset brings all of the TUSB8020B internal registers to their default states. When GRSTz is asserted,

GRSTz

11

PU

the device is completely nonfunctional.

Crystal input. This terminal is the crystal input for the internal oscillator. The input may alternately be driven by the output of an

XI

38

I

external oscillator. When using a crystal a 1-M

Ω feedback resistor is required between XI and XO.

Crystal output. This terminal is the crystal output for the internal oscillator. If XI is driven by an external oscillator this pin may be

XO

39

O

left unconnected. When using a crystal a 1-M

Ω feedback resistor is required between XI and XO.

USB UPSTREAM SIGNALS

USB_SSTXP_UP

29

O

USB SuperSpeed transmitter differential pair (positive)

USB_SSTXM_UP

28

O

USB SuperSpeed transmitter differential pair (negative)

USB_SSRXP_UP

32

I

USB SuperSpeed receiver differential pair (positive)

USB_SSRXM_UP

31

I

USB SuperSpeed receiver differential pair (negative)

USB_DP_UP

26

I/O

USB high-speed differential transceiver (positive)

USB_DM_UP

27

I/O

USB high-speed differential transceiver (negative)

USB_R1

24

I

Precision resistor reference. A 9.53-k

Ω ±1% resistor should be connected between USB_R1 and GND.

USB upstream port power monitor. The VBUS detection requires a voltage divider. The signal USB_VBUS must be connected to

USB_VBUS

9

I

VBUS through a 90.9-k

Ω ±1% resistor, and to ground through a

10-k

Ω ±1% resistor from the signal to ground.

USB DOWNSTREAM SIGNALS

USB_SSTXP_DN1

43

O

USB SuperSpeed transmitter differential pair (positive) downstream port 1.

USB_SSTXM_DN1

44

O

USB SuperSpeed transmitter differential pair (negative) downstream port 1.

USB_SSRXP_DN1

46

I

USB SuperSpeed receiver differential pair (positive) downstream port 1.

USB_SSRXM_DN1

47

I

USB SuperSpeed receiver differential pair (negative) downstream port 1.

USB_DP_DN1

41

I/O

USB high-speed differential transceiver (positive) downstream port 1.

USB_DM_DN1

42

I/O

USB high-speed differential transceiver (negative) downstream port 1.

USB port 1 power-on control for downstream power or battery charging enable. The terminal is used for control of the

downstream power switch for Port 1.

I/O

In addition, the value of the terminal is sampled at the deassertion of reset to determine the value of the battery charging

PWRCTL1/BATEN1

4

PD

support for Port 1 as indicated in the Battery Charging Support register.

0 = Battery charging not supported

1 = Battery charging supported

USB DS port 1 overcurrent detection input. This terminal is used to connect the over current output of the downstream port

power switch for port 1.

0 = An overcurrent event has occurred

I

OVERCUR1z

5

1 = An overcurrent event has not occurred

PU

If power management is enabled, the external circuitry needed should be determined by the power switch. In ganged mode,

either OVERCUR1z or OVERCUR2z can be used. In ganged mode, the overcurrent will be reported as a hub event instead of a

port event.

USB_SSTXP_DN2

16

O

USB SuperSpeed transmitter differential pair (positive) downstream port 2.

USB_SSTXM_DN2

17

O

USB SuperSpeed transmitter differential pair (negative) downstream port 2.

USB_SSRXP_DN2

19

I

USB SuperSpeed receiver differential pair (positive) downstream port 2.

USB_SSRXM_DN2

20

I

USB SuperSpeed receiver differential pair (negative) downstream port 2.

USB_DP_DN2

14

I/O

USB high-speed differential transceiver (positive) downstream port 2.

USB_DM_DN2

15

I/O

USB high-speed differential transceiver (negative) downstream port 2.

Power-on control /battery charging enable for downstream port 2. This terminal is used for control of the downstream power

switch for port 2.

I/O

The value of the terminal is sampled at the deassertion of reset to determine the value of the battery charging support for port 2

PWRCTL2/BATEN2

6

PD

as indicated in the Battery Charging Support register.

0 = Battery charging not supported

1 = Battery charging supported

Overcurrent detection for downstream port 2. This terminal is used to connect the over current output of the downstream port

power switch for port 2.

0 = An overcurrent event has occurred

I

OVERCUR2z

8

1 = An overcurrent event has not occurred

PU

If power management is enabled, the external circuitry needed should be determined by the power switch. In ganged mode

either OVERCUR1z or OVERCUR2z can be used. In ganged mode the overcurrent will be reported as a hub event instead of a

port event.

(1)

I = input, O = output, I/O = input/output, PU = internal pullup resistor, PD = internal pulldown resistor, and PWR = power signal

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