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TUSB8040_1110 Datasheet(PDF) 14 Page - Texas Instruments |
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TUSB8040_1110 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 33 page  TUSB8040 SLLSE42F – SEPTEMBER 2010 – REVISED OCTOBER 2011 www.ti.com 2.4 I 2C/SMBUS Signals Table 2-4. I2C/SMBUS Signals PIN NO. SIGNAL NAME TYPE DESCRIPTION PFP RKM I2C 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 I2C EEPROM. SCL/SMBCLK I/O, PD 34 B17 When SMBUSz = 0, this terminal acts as the serial clock interface for an SMBus host. Can be left unconnected if external interface not implemented. I2C 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 I2C 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 SDA/SMBDAT I/O, PD 35 A19 SuperSpeed USB low power states U1 and U2 are disabled. If SDA_SMBDAT is high, U1 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. I2C/SMBus mode select. 1 = I2C Mode Selected SMBUSz I, PU 36 B18 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 PIN NO. SIGNAL NAME TYPE DESCRIPTION PFP RKM JTAG_TCK I/O, PD 27 B13 JTAG test clock. Can be left unconnected. JTAG_TDI I/O, PU 31 B15 JTAG test data in. Can be left unconnected. JTAG_TDO I/O, PD 29 A15 JTAG test data out. Can be left unconnected. JTAG_TMS I/O, PU 28 B14 JTAG test mode select. Can be left unconnected. JTAG_RSTz I/O, PD 30 A16 JTAG reset. Pull down using an external 1-K Ω resistor for normal operation. High-speed suspend status output. 0 = High-speed upstream port not suspended HS_SUSPEND O 24 B11 1= High-speed upstream port suspended Can be left unconnected. SuperSpeed suspend status output. 0 = SuperSpeed upstream port not suspended SS_SUSPEND O 25 A13 1= SuperSpeed upstream port suspended Can be left unconnected. 14 PIN DESCRIPTIONS Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TUSB8040 |
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