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BQ24392 Datasheet(PDF) 6 Page - Texas Instruments |
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BQ24392 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 17 page bq24392 SLIS146A – JUNE 2012 – REVISED JUNE 2012 www.ti.com GENERAL OPERATION The bq24392 is designed to interface a micro/mini USB connector to external peripherals. The device will automatically detect different types of chargers through the mini/micro USB pin connector. The bq24392 has a high speed USB 2.0 switch that can be automatically opened and closed based on the accessory detected. DETECTION SEQUENCE After accessory insertion, once VBUS voltage is greater than VBUS_VALID threshold, the device proceeds onto data contact detection. This state has a 600ms timeout feature specified in BCDv1.2. Depending on the result, the next step is primary detection or non-compatible USB charger detection. In the case of former, the next step is detecting a Standard Downstream Port (SDP), Dedicated Charging Port (DCP), or Charging Downstream Port (CDP). In the case of latter, the next step is detecting an Apple, TomTom, or Non-compliant Charger. The USB 2.0 switches are automatically closed to enable data transfer if either SDP or CDP is detected and the GOOD_BAT input is HIGH. Once a charger has been detected, and if the GOOD_BAT input is LOW, a Dead Battery timer is initiated. If the GOOD_BAT continues to be LOW for 30 minutes (maximum of 45 minutes), charging is disabled. Toggling GOOD_BAT HIGH after DBP timer expires will re-start detection. The following flow-chart shows the detection sequence used in the bq24392. 6 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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