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SN65LVPE502RGER Datasheet(PDF) 2 Page - Texas Instruments |
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SN65LVPE502RGER Datasheet(HTML) 2 Page - Texas Instruments |
2 / 27 page SN65LVPE502 SLLSE29 – APRIL 2010 www.ti.com Anytime an upstream device gets reconnected the redriver automatically senses the connection and goes to normal operating mode. This operation requires no setting to the device. 3. U2/U3 Mode With the help of internal timers the device tracks when link enters USB 3.0 low power modes U2 and U3, in these modes link is in electrical idle state. SN65LVPE502 will selectively turn-off internal circuitry to save on power. Typical power saving is about 75% lower than normal operating mode. The device will automatically revert to active mode when signaling activity (LFPS) is detected. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION CONTINUED Receiver Detection RX.Detect cycle is performed by first setting Rx termination for each channel to Hi-Z, device then starts sensing for receiver termination that may be attached at the other end of each TX. If receiver is detected on both channel: • The TX and RX terminations are switched to ZDIFF-TX, ZDIFF-RX, respectively If no receiver is detected on one or both channels: • The transmitter is pulled to Hi-Z • The channel is put in low power mode • Device attempts to detect Rx termination in 12 ms (TYP) interval until termination is found or the device is put in sleep mode. USB Compliance Mode The device enters USB compliance mode when both EN_RXD and CM pins are set H. This mode is used to test the transmitter for compliance to voltage and timing specifications per USB 3.0 compliance specs. In this mode each channel will maintain its low-impedance termination RDC-RX, while auto Rx detect operation in the device is disabled. Electrical Idle Support The electrical idle support is needed for low frequency periodic signaling (LFPS) used in USB 3.0 side band communication. A link is in an electrical idle state when the TX± voltage is held at a steady constant value like the common mode voltage. SN65LVPE502 detects an electrical idle state when RX± voltage at the device pin falls below VRX_IDLE_DIFFpp min. After detection of an idle state in a given channel the device asserts electrical idle state in its corresponding TX. When RX± voltage exceeds VRX_IDLE_DIFFpp max normal operation is restored and output start passing input signal. The electrical idle exit and entry time is specified at ≤6 ns. 2 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): SN65LVPE502 |
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