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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ISL54200 Scheda tecnica(PDF) 9 Page - Intersil Corporation |
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ISL54200 Scheda tecnica(HTML) 9 Page - Intersil Corporation |
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9 / 16 page  9 FN6408.1 July 11, 2007 The HSx switches can also pass USB full-speed signals (12Mbps) with minimal distortion and meet all the USB requirements for USB 2.0 full-speed signaling. See Figure 11. The maximum signal range for the HSx switches is from -1.5V to VDD. The signal voltage should not be allow to exceed the VDD voltage rail or go below ground by more than -1.5V. The HSx switches are active (turned ON) whenever the IN voltage is ≥1.4V and the EN logic voltage ≥1.4V when operated with a 2.7V to 3.6V supply. ISL54200 Operation The discussion that follows will discuss using the ISL54200 in the typical application shown in the“Application Block Diagram” on page 8. POWER The power supply connected at the VDD (pin 1) provides the DC bias voltage required by the ISL54200 part for proper operation. The ISL54200 can be operated with a VDD voltage in the range of 2.7V to 5.5V. When used in a USB application, the VDD voltage should be kept in the range of 3.0V to 5.5V to ensure you get the proper signal levels for good signal quality. A 0.01µF or 0.1µF decoupling capacitor should be connected from the VDD pin to ground to filter out any power supply noise from entering the part. The capacitor should be located as close to the VDD pin as possible. LOGIC CONTROL The state of the ISL54200 device is determined by the voltage at the IN pin (pin 2) and the EN pin (pin 10). IN is only active when the EN pin is logic “1” (High). Refer to the “Truth Table” on page 2. The EN pin is internally pulled low through a 4M Ω resistor to ground. For logic “0” (Low) it can be driven low or allowed to Float. The IN pin must be driven low or high and cannot be left floating. Logic control voltage levels: EN = Logic “0” (Low) when VEN ≤0.5V or Floating. EN = Logic “1” (High) when VEN ≥1.4V IN = Logic “0” (Low) when VIN ≤0.5V. IN = Logic “1” (High) when VIN ≥1.4V Full-speed Mode If the IN pin = Logic “0” and the EN pin = Logic “1”, the part will be in the full-speed mode. In this mode, the FSD1 and FSD2 switches are ON and the HSD1 and HSD2 switches are OFF (high impedance). In a typical application, VDD will be in the range of 2.8V to 3.6V and will be connected to the battery or LDO of the portable media device. When a computer or USB hub is plugged into the common USB connector and the part is in the full-speed mode, a link will be established between the full-speed driver section of the media player and the computer. The device will be able to transmit and receive data from the computer at a data rate of 12Mbps. High-speed Mode If the IN pin = Logic “1” and the EN pin = Logic “1”, the part will go into high-speed mode. In high-speed mode, the HSD1 and HSD2 switches are ON and the FSD1 and FSD2 switches are OFF (high impedance). When a USB cable from a computer or USB hub is connected at the common USB connector and the part is in the high-speed mode, a link will be established between the high-speed driver section of the media player and the computer. The device will be able to transmit and receive data from the computer at a data rate of 480Mbps. All Switches OFF Mode If the IN pin = Logic “0” or Logic “1” and the EN pin = Logic “0”, all of the switches will turn OFF (high impedance). The all OFF state can be used to switch between the two USB sections of the media player. When disconnecting from one USB device to the other USB device, you can momentarily put the ISL54200 switch in the “all off” state in order to get the computer to disconnect from the one device so it can properly connect to the other USB device when that channel is turned ON. ISL54200 |
Codice articolo simile - ISL54200_07 |
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