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ISL54214IRTZ Scheda tecnica(PDF) 11 Page - Intersil Corporation |
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ISL54214IRTZ Scheda tecnica(HTML) 11 Page - Intersil Corporation |
11 / 22 page ISL54214 11 FN6816.3 June 28, 2010 These switches can also swing rail-to-rail and pass USB full-speed signals (12Mbps) with minimal distortion. See Figure 25 for the full-speed eye pattern taken with the switch in the signal path. The maximum normal operating signal range for the USB switches is from -1V to VDD. The signal voltage at D- and D+ should not be allow to exceed the VDD voltage rail or go below ground by more than -1V for normal operation. However, in the event that the USB 5.25V VBUS voltage is shorted to one or both of the COM pins, the ISL54214 has fault protection circuitry to prevent damage to the ISL54214 part. The fault circuitry allows the signal pins (COM-, COM+, 1D-, 1D+, 2D-, 2D+, L and R) to be driven up to 5.25V while the VDD supply voltage is in the range of 0V to 4.6V. This fault condition causes no stress to the IC. In addition, when VDD is at 0V (ground), all switches are OFF and the fault voltage is isolated from the other side of the switch. When VDD is in the range of 2.7V to 4.6V, the fault voltage will pass through to the output of an active switch channel. Note: During the fault condition normal operation is not guaranteed until the fault condition is removed. The USB (1D+ and 1D-) switches are active (turned ON) whenever the C1 is logic “0” (Low) and C0 is logic “1” (High). The USB (2D+ and 2D-) switches are active (turned ON) whenever the C1 is logic “1” (High) and C0 is logic “0” (Low) provided the last state was not the Audio or Audio Mute state. ISL54214 Operation The discussion that follows will discuss using the ISL54214 in the “Application Block Diagrams” on page 10. LOGIC CONTROL The state of the ISL54214 device is determined by the voltage at the C1 pin (pin 9) and the C0 pin (pin 10). The part has five states or modes of operation. The All SWITCHES OFF mode, USB1 mode, USB2 mode, Audio mode and Audio Mute mode. Refer to the “Truth Table” on page 2 and “State Diagram” on page 2. The C1 pin and C0 pin are internally pulled low through 4MΩ resistors to ground and can be tri-stated or left floating. The C1 pin and C0 pin can be driven with a voltage that is higher than the VDD supply voltage. They can be driven up to 5.25V with the VDD supply in the range of 2.7V to 4.6V. Driving the logic higher than the supply rail will cause the logic current to increase. With VDD = 2.7V and VLOGIC = 5.25V, ILOGIC current is approximately 5.5µA. Logic Control Voltage Levels With VDD in the range of 2.7V to 3.6V the logic levels are: C1, C0 = Logic “0” (Low) when ≤ 0.5V or Floating. C1, C0 = Logic “1” (High) when ≥ 1.4V ALL SWITCHES OFF Mode If the C1 pin = Logic “0” and C0 pin = Logic “0” the part will be in the ALL SWITCHES OFF mode. In this mode, the 2D- and 2D+ USB switches, the L and R audio switches and the 1D- and 1D+ USB switches will be OFF (high impedance). The 1kΩ shunts on the COM side will be disconnected (OFF). It is recommended that when transitioning from USB1 to USB2 or from USB2 to USB1 that you always pass through the All Switches OFF state. Audio Mode If the C1 pin = Logic “1” and C0 pin = Logic “1”, the part will be in the Audio mode. In Audio mode, the L (left) and R (right) 2.3Ω audio switches are ON, the 1D- and 1D+ 6.2Ω USB switches and 2D- and 2D+ 6.2Ω USB switches will be OFF (high impedance). The 1kΩ shunts on the COM side of the switch will be disconnected (OFF). When a headphone is plugged into the common connector, the µcontroller will drive the C1 and C0 logic pins “High” putting the part in the audio mode. In the Audio mode, the audio drivers of the player can drive the headphones and play music. USB1 Mode If the C1 pin = Logic “0” and C0 pin = Logic “1” the part will go into USB1 mode. In USB1 mode, the 1D- and 1D+ 6.2Ω switches are ON and the L and R 2.3Ω audio switches and 2D- and 2D+ 6.2Ω USB switches will be OFF (high impedance). The 1kΩ COM shunt resistors will be disconnected (OFF). When a USB cable from a computer or USB hub is connected at the common connector, the μcontroller will route the incoming USB signal to USB transceiver section #1 by taking the C1 pin “Low” and the C0 pin “High” putting the ISL54214 part into the USB1 mode. In USB1 mode the computer or USB hub transceiver and the MP3 player or cellphone USB transceiver #1 are connected and digital data will be able to be transmit back and forth. USB2 Mode If the C1 = Logic “1” and C0 pin = Logic “0” the part will be in the USB2 mode provided that the last state was not the Audio or Audio Mute state. In the USB2 mode, the 2D- and 2D+ 6.2Ω USB switches will be ON and audio switches and the 1D- and 1D+ USB switches will be OFF (high impedance). The 1kΩ COM shunt resistors will be disconnected (OFF). When a USB cable from a computer or USB hub is connected at the common connector, the μcontroller will route the incoming USB signal to USB transceiver section #2 by taking the C1 pin “High” and the C0 pin “Low” putting the ISL54214 part into the USB2 mode. In USB2 ISL54214 |
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