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PI5USB2549 Datasheet(PDF) 11 Page - Pericom Semiconductor Corporation |
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PI5USB2549 Datasheet(HTML) 11 Page - Pericom Semiconductor Corporation |
11 / 13 page |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||| All trademarks are property of their respective owners 2014-08-0001 www.pericom.com PT0516 8/27/14 11 PI5USB2549 USB Charging Port Controller and Load Detection Power Switch DCP-1.2V Charging Scheme DCP-1.2V charging scheme is used by some handheld devices to enable fast charging at 2.0A. PI5USB2549 supports this scheme in the DCP-Auto mode before the device enters BC1.2 shorted mode. To simulate this charging scheme D+/D- lines are shorted and pulled-up to 1.2V for fixed duration then device moves to DCP shorted mode as defined in BC1.2 spec. This is shown as Figure 3. Figure 4, DCP-1.2V Charging Scheme Output Discharge To allow a charging port to renegotiate current with a portable device, PI5USB2549 uses the OUT discharge function. It proceeds by turning off the power switch while discharging OUT, then turning back on the power switch to reassert the OUT voltage. Over-Current Protection When an over-current condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Two possible overload conditions can occur. In the first condition, the output has been shorted before the device is enabled or before VIN has been applied. The PI5USB2549 senses the short and immediately switches into a constant-current output. In the second condition, a short or an overload occurs while the device is enabled. At the instant the overload occurs, high currents may flow for nominally one to two microseconds before the current-limit circuit can react. The device operates in constant-current mode after the current-limit circuit has responded. Complete shutdown occurs only if the fault is presented long enough to activate thermal limiting. The device will remain off until the junction temperature cools approximately 20°C and will then re-start. The device will continue to cycle on/off until the over-current condition is removed. GND USB Connector 2.0V 1.2V 2.7V Auto Detect D- D+ PI5USB2549 VBUS |
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