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The RT8973A is a USB port accessory detector and switch that is optimized to protect low voltage system from abnormal high input voltage (up to 28V). The RT8973A supports high speed USB operation and I<sup>2</sup>C interface control. The RT8973A provides a device detection function by using the USB ID pin signal and the VBUS voltage. The ID pin resistance and VBUS voltage determine the unique characteristics for variety accessories. The host microprocessor can use I<sup>2</sup>C interface to control the switch position and read the results of the accessory detection. The RT8973A also detects USB chargers including dedicated chargers (D+/D- shorted) and high power host/hub chargers. </p>
RT8973A Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Hi-Speed USB Operation </li><li>UART Switch </li><li>Interrupt for Device Insertion and Removal </li><li>Interrupt for Protection Function </li><li>Default Startup Mode for Factory Support </li><li>Battery Charger Detection (BCD 1.2) Compliant </li><li>28V Maximum Rating for DC Adapter </li><li>Integrated Over-Voltage and Over-Current Protection FET On VBUS for Fault Isolation </li><li>I<sup>2</sup>C Controlled Interface </li></ul></div>
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RT8973A Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Cellular Phone </li><li>Smart Handheld Device </li></ul></div>
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