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PACUSB-U2R Datasheet(PDF) 5 Page - California Micro Devices Corp |
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PACUSB-U2R Datasheet(HTML) 5 Page - California Micro Devices Corp |
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5 / 7 page  © 2006 California Micro Devices Corp. All rights reserved. 05/01/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com 5 PACUSB-U1/U2/U3 Application Information The PACUSB-U1/U2/U3 is targeted for upstream USB ports (peripherals). It provides series termination, EMI filtering, and ESD protection for the two USB data lines D+ and D-. The USB Specification revision 1.1 provides for two data rates: • The Full Speed signaling bit rate at 12 Mbits per second, and • The Low Speed signaling bit rate at 1.5 Mbits per second. The speed is selected by connecting one of the data lines (D+ or D-) to a 3.3V supply voltage via a 1.5k Ω pull-up resistor (R2). Connections for Full Speed Operation Full Speed devices have the pull-up resistor (R2) con- nected to the D+ data line, as shown in Figure 1. Pin1 is tied to the D+ line of the USB controller. Pin 6 is con- nected to the D+ line on the USB connector. Connections for Low Speed Operation Low Speed devices have the pull-up resistor (R2) con- nected to the D- data line, as shown in Figure 2. Pin 1 is tied to the D- line of the USB controller; pin 6 is con- nected to the D- line on the USB connector. Figure 1. Full Speed Connection Figure 2. Low Speed Connection USB CONNECTOR Vcc SC70-6 R1 GND IN1 OUT 1 OUT 2 IN2 1 2 3 C1 C1 R1 R2 6 5 4 D1_i GND D2_i D2_c D1_c V3.3 USB CONTROLLER 3.3V D+ D- D+ D- GND PACUSB-Ux USB CONNECTOR Vcc SC70-6 R1 GND IN1 OUT 1 OUT 2 IN2 1 2 3 C1 C1 R1 R2 6 5 4 D1_i GND D2_i D2_c D1_c V3.3 USB CONTROLLER 3.3V D- D+ D- D+ GND PACUSB-Ux |
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