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SN65LVPE502A Datasheet(PDF) 10 Page - Texas Instruments |
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SN65LVPE502A Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page SN65LVPE502A SLLSEB3A – MARCH 2012 – REVISED APRIL 2012 www.ti.com DETAILED DESCRIPTION Programmable EQ, De-Emphasis and Amplitude Swing The SN65LVPE502A is designed to minimize signal degradation effects such as crosstalk and inter-symbol interference (ISI) that limits the interconnect distance between two devices. The input stage of each channel offers selectable equalization settings that can be programmed to match loss in the channel. The differential outputs provide selectable de-emphasis to compensate for the anticipated distortion USB 3.0 signal will experience. Level of de-emphasis will depend on the length of interconnect and its characteristics. The SN65LVPE502A provides a unique way to tailor output de-emphasis on a per channel basis with use of DE and OS pins. All Rx and Tx equalization settings supported by the device are programmed by six 3-state pins as shown in Table 2. Low Power Modes Device supports three low power modes as described below 1. Sleep Mode Initiated anytime EN_RXD undergoes a high to low transition and stays low or when device powers up with EN_RXD set low. In sleep mode both input and output terminations are held at HiZ and device ceases operation to conserve power. Sleep mode max power consumption is 1mW, entry time is 2µs, device exits sleep mode to Rx.Detect mode after EN_RXD is driven to Vcc, exit time is 100µs max. 2. RX Detect Mode--When no remote device is connected Anytime LVPE502CP detects a break in link (i.e. when upstream device is disconnected) or after power-up fails to find a remote device, LVPE502CP goes to Rx Detect mode and conserves power by shutting down majority of its internal circuitry. In this mode input termination for both channels are driven to Hi-Z. In Rx Detect mode device power is <10mW (TYP) or less than 5% of its normal operating power . This feature is very useful in saving system power in mobile applications like notebook PC where battery life is critical. 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. LVPE502CP 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 signal activity (LFPS) is detected. Receiver Detection At Power Up or Reset After power-up or anytime EN_RXD is toggled, 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 device is put in sleep mode During U2/U3 Link State Rx detection is also performed periodically when link is in U2/U3 states. However in these states during Rx detection, input termination is not automatically disabled before performing Rx.Detect. If termination is found device goes back to its low power state if termination is not found then device disables its input termination and then jumps to power-up RX.Detect state. 10 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s): SN65LVPE502A |
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