Datasheet

Not Recommended for New Designs
TUSB8040
www.ti.com SLLSE42I –SEPTEMBER 2010–REVISED SEPTEMBER 2013
2.4 I
2
C/SMBUS Signals
Table 2-4. I
2
C/SMBUS Signals
SIGNAL NAME TYPE PIN NO. DESCRIPTION
I
2
C clock/SMBus clock. Function of terminal depends on the setting of the SMBUSz input.
When SMBUSz = 1, this terminal acts as the serial clock interface for an I
2
C EEPROM.
SCL/SMBCLK I/O, PD 34
When SMBUSz = 0, this terminal acts as the serial clock interface for an SMBus host.
Can be left unconnected if external interface not implemented.
I
2
C data/SMBus data. Function of terminal depends on the setting of the SMBUSz input.
When SMBUSz = 1, this terminal acts as the serial data interface for an I
2
C EEPROM.
When SMBUSz = 0, this terminal acts as the serial data interface for an SMBus host.
The SDA_SMBDAT terminal is sampled at the deassertion of reset to determine if
SuperSpeed USB low power states U1 and U2 are disabled. If SDA_SMBDAT is high, U1
SDA/SMBDAT I/O, PD 35
and U2 low power states are disabled. If SDA_SMBDAT is low, U1 and U2 low power
states are enabled.
If the optional EEPROM or SMBUS is implemented, the value of the u1u2Disable bit of the
Device Configuration Register determines if the low power states U1 and U2 are enabled.
Can be left unconnected if external interface not implemented and U1 and U2 are to be
enabled.
I
2
C/SMBus mode select.
1 = I
2
C Mode Selected
SMBUSz I, PU 36
0 = SMBus Mode Selected
Can be left unconnected if external interface not implemented.
2.5 Test and Miscellaneous Signals
Table 2-5. Test and Miscellaneous Signals
SIGNAL NAME TYPE PIN NO. DESCRIPTION
JTAG_TCK I/O, PD 27 JTAG test clock. Can be left unconnected.
JTAG_TDI I/O, PU 31 JTAG test data in. Can be left unconnected.
JTAG_TDO I/O, PD 29 JTAG test data out. Can be left unconnected.
JTAG_TMS I/O, PU 28 JTAG test mode select. Can be left unconnected.
JTAG_RSTz I/O, PD 30 JTAG reset. Pull down using an external 1-KΩ resistor for normal operation.
High-speed suspend status output.
0 = High-speed upstream port not suspended
HS_SUSPEND O 24
1= High-speed upstream port suspended
Can be left unconnected.
SuperSpeed suspend status output.
0 = SuperSpeed upstream port not suspended
SS_SUSPEND O 25
1= SuperSpeed upstream port suspended
Can be left unconnected.
High-speed status. The terminal is to indicate the connection status of the upstream port as
documented below:
0 = Hub in low/full speed mode
HS O 22
1 = Hub in high-speed mode
Can be left unconnected.
SuperSpeed status. The terminal is to indicate the connection status of the upstream port
as documented below:
0 = Hub not in SuperSpeed mode
SS O 23
1 = Hub in SuperSpeed mode
Can be left unconnected.
Copyright © 2010–2013, Texas Instruments Incorporated PIN DESCRIPTIONS 11
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