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ISL54220IUZ Scheda tecnica(PDF) 10 Page - Intersil Corporation |
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ISL54220IUZ Scheda tecnica(HTML) 10 Page - Intersil Corporation |
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10 / 18 page  10 FN6819.1 February 4, 2010 and the fault voltage is isolated from the other side of the switch. When VDD is in the range of 2.7V to 5.5V the fault voltage will pass through to the output of an active switch channel. The HS1 channel switches are active (turned ON) whenever the SEL voltage is logic “0” (Low) and the OE voltage is logic “0” (Low). The HS2 channel switches are active (turned ON) whenever the SEL voltage is logic “1” (High) and the OE voltage is logic “0” (Low). ISL54220 Operation The following will discuss using the ISL54220 shown in the “Application Block Diagram” on page 9. POWER The power supply connected at the VDD pin provides the DC bias voltage required by the ISL54220 part for proper operation. The ISL54220 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. In a typical application, VDD will be in the range of 2.8V to 4.3V and will be connected to the battery or LDO of the portable media device. LOGIC CONTROL The state of the ISL54220 device is determined by the voltage at the SEL pin and the OE pin. SEL is only active when the OE pin is logic “0” (Low). Refer to “Truth Table” on page 2. The ISL54220 logic pins are designed to minimize current consumption when the logic control voltage is lower than the VDD supply voltage. With VDD = 3.6V and logic pins at 1.4V the part typically draws only 6.6µA. With VDD = 4.3V and logic pins at 2.6V, the part typically draws only 0.2µA. Driving the logic pins to the VDD supply rail minimizes power consumption. The logic pins must be held High or Low and must not float. Logic Control Voltage Levels With VDD supply voltage in the range of 2.7V to 3.6V the logic levels are: OE = Logic “0” (Low) when VOE ≤ 0.5V OE = Logic “1” (High) when VOE ≥ 1.4V SEL = Logic “0” (Low) when VSEL ≤ 0.5V SEL = Logic “1” (High) when VSEL ≥ 1.4V With VDD supply voltage in the range of 4.3V to 5.5V the logic levels are: OE = Logic “0” (Low) when VOE ≤ 0.8V OE = Logic “1” (High) when VOE ≥ 2.0V SEL = Logic “0” (Low) when VSEL ≤ 0.8V SEL = Logic “1” (High) when VSEL ≥ 2.0V HSD1 USB Channel If the SEL pin = Logic “0” and the OE pin = Logic “0”, high-speed Channel 1 will be ON. The HSD1- and HSD1+ switches are ON and the HSD2- and HSD2+ switches are OFF (high impedance). When a computer or USB hub is plugged into the common USB connector and channel one is active, a link will be established between the USB 1 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. HSD2 USB Channel If the SEL pin = Logic “1” and the OE pin = Logic “0”, high-speed Channel 2 will be ON. The HSD2- and HSD2+ switches are ON and the HSD1- and HSD1+ 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 has Channel 2 active, a link will be established between the USB 2 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 SEL pin = Logic “0” or Logic “1” and the OE pin = Logic “1”, 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 ISL54220 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. USB 2.0 VBUS Short Requirements The USB specification in section 7.1.1 states a USB device must be able to withstand a VBUS short to the D+ or D- signal lines when the device is either powered off or powered on for at least 24 hours. The ISL54220 part has special fault protection circuitry to meet these short circuit requirements. The fault protection circuitry allows the signal pins (D-, D+, HS1D-, HS1D+, HS2D-, HS2D+) to be driven up to 5.5V while the VDD supply voltage is in the range of 0V to 5.5V. In this overvoltage condition the part draws <500µA of current and causes no stress/damage to the IC. ISL54220 |
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