TUSB8044 datasheet(7/61 Pages) TI1

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TUSB8044

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Pin Functions (continued)

I/O

DESCRIPTION

NAME

NO.

OVERCUR4z

I, PU

USB Port 4 Over-Current Detection. This pin is typically connected to the over current output

of the downstream port power switch for Port 4.

0 = An over current event has occurred

1 = An over current event has not occurred

When GANGED power management is enabled, this pin or one of the other OVERCURz pins

must be connected to the over current output of the power switch or circuit which detects the

over current conditions. For the case when another OVERCURz pin is used, this pin can be

left unconnected.

I2C/SMBUS I2C Signals

SCL/SMBCLK

I/O, PD

I2C clock/SMBus clock. Function of pin depends on the setting of the SMBUSz input.

When SMBUSz = 1, this pin acts as the serial clock interface for an I2C EEPROM.

When SMBUSz = 0, this pin acts as the serial clock interface for an SMBus host.

Can be left unconnected if external interface not implemented.

SDA/SMBDAT

I/O, PD

I2C data/SMBus data. Function of pin depends on the setting of the SMBUSz input.

When SMBUSz = 1, this pin acts as the serial data interface for an I2C EEPROM.

When SMBUSz = 0, this pin acts as the serial data interface for an SMBus host.

Can be left unconnected if external interface not implemented.

SMBUSz/SS_SUSPEND

I/O, PU

I2C/SMBus mode select/SuperSpeed USB Suspend Status. The value of the pin is sampled

at the de-assertion of reset set I2C or SMBus mode as follows:

1 = I2C Mode Selected

0 = SMBus Mode Selected

Can be left unconnected if external interface not implemented.

After reset, this signal indicates the SuperSpeed USB Suspend status of the upstream port if

enabled through the stsOutputEn bit in the Additional Feature Configuration register. When

enabled, a value of 1 indicates the connection is suspended.

Test and Miscellaneous Signals

PWRCTL_POL

I/O, PU

Power Control Polarity.

The value of the pin is sampled at the de-assertion of reset to set the polarity of

PWRCTL[4:1].

0 = PWRCTL polarity is active low

1 = PWRCTL polarity is active high

BBEN/GANGED/HS_UP

I/O, PD

When configured for I2C mode, this pin functions as Billboard Enable. When high, the

billboard device is enabled and presented to system. When low, the billboard device is

disabled. If SMBus is selected, then Billboard enable is controlled by a register.

If SMBus is selected and stsOutputEn bit is set, this pin will function as a HS_UP (upstream

HS connection indicator). When enabled, a value of 1 indicates the upstream port is

connected to a High-speed USB capable port.

If SMBus is selected, the value of the pin is sampled at the de-assertion of reset to set the

power switch and over current detection mode as follows: 0= Individual port power control

supported. 1= Ganged port Power control supported. SMBus master can at a later time

override the register.

BBbmConfigured0

/FULLAUTOz /

FULLPWRMGMTz

/SS_UP

I/O, PD

When configured for I2C mode, this pin along with BBbmConfigured1 directly controls the

bmConfigurated field in the Billboard Capability descriptor. If SMBus is selected, then

bmConfigured[0] field is determined by a register.

If SMBus is selected and battery charginig is enabled on any port, the sampled state of this

pin will set or clear the FullAutoEn bit in the Device Configuration Register 3. SMBus master

can at a later time override the register.

If SMBus is selected and battery charging is disabled, then the value of the pin is sampled at

the de-assertion of reset to set the power switch control: SMBus master can at a later time

override this function.

0 = Power Switching and over current inputs supported.

1= Power Switch and over current inputs not supported.

If SMBus is selected and stsOutputEn bit is set, ths pin will function as a SS_UP (upstream

SS connection indicator). When enabled, a value of 1 indicates the upstream port is

connected to a SuperSpeed USB capable port.

TUSB8044 Datasheet(PDF) 7 Page - Texas Instruments

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