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MAX14566BE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX14566BE Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 15 page  USB Host Charger Identification Analog Switches 11 with CB1. Connect CB1 to a logic-level low for auto mode (AM) or connect CB1 to a logic-level high for forced dedicated-charger mode (FM). Autodetection All the devices feature autodetection charger mode for dedicated chargers and USB masters. CB must be set low to activate autodetection charger mode. In autodetection charger mode, the MAX14566E moni- tors the voltages at DM and DP to determine the type of the device attached. If the voltage at DM is +2.3V (typ) or higher and the voltage at DP is +2.3V (typ) or lower, the voltage stays unchanged. If the voltage at DM is forced below the +2.3V (typ) threshold, the internal switch disconnects DM and DP from the resistor-divider and DP and DM are shorted together for dedicated charging mode. If the voltage at DP is forced higher than the +2.3V (typ) threshold, the internal switch disconnects DM and DP from the resistor-divider and DP and DM are shorted together for dedicated charging mode. Once the charging voltage is removed, the short between DP and DM is disconnected for normal operation. Automatic Peripheral Reset The MAX14566E/MAX14566AE feature automatic current- limit switch control output. This feature resets the peripher- al connected to VBUS in the event the USB host switches to or from standby mode. CEN/CEN provide a 1s (typ) pulse on the rising or falling edge of CB (Figures 4, 5, and 6). Table 1. Digital Input State (MAX14566E/MAX14566AE) Table 2. Digital Input State (MAX14566BE) Figure 4. MAX14566E Peripheral Reset Timing Diagram X = Don't care. ATTACH CEN VBUS CB 5V AM PM PM AM USB PERIPHERAL STANDBY tVBT USB CONNECTION CHARGING CURRENT 1000mA 500mA 1000mA 500mA 1000mA CB MODE DP/DM COMMENT INTERNAL RESISTOR-DIVIDER 0 AM Autodetection Circuit Active Auto Mode Connected 1 PM Connected to TDP/TDM USB Traffic Active Not Connected CB CB1 MODE STATUS 0 0 AM Auto Mode 0 1 FM Forced Dedicated-Charger Mode: DP/DM Shorted 1 X PM Pass-Through (USB) Mode: Connect DP/DM to TDP/TDM |
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