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CM2400-02TR Datasheet(PDF) 11 Page - California Micro Devices Corp |
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CM2400-02TR Datasheet(HTML) 11 Page - California Micro Devices Corp |
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11 / 14 page  © 2004 California Micro Devices Corp. All rights reserved. 08/24/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 11 CM2400-02/03/04 PRELIMINARY Functional Description The CM2400-02/03/04 USB Transceiver supports 3 dif- ferent power supply configurations, which can be con- figured dynamically. Table 1 details the various configurations. In Normal Mode the internal regulator produces 3.3V from VBUS to power the internal drivers and receivers associated with the USB protocol. Table 1: Power Supply Connections There are three power supply configurations for the CM2400-02/03/04: Normal mode, Disable mode and Sharing mode. These three modes can be changed dynamically. Normal mode occurs when the VCC and VBUS inputs are both connected to a source. VBUS is tied to a 5V source for 5V operation. The internal regulator of the CM2400-02/03/04 provides 3.3V output on VREG. The VCC input is connected to an independent source that can range from 1.65V to 3.6V. When VCC is not connected and VBUS is connected, the device is in Disable mode. The D+ and D- pins are in tri-state and power consumption drops to a suspend state level. In Sharing mode, VCC is connected while VBUS is below 3.6V. The D+ and D- pins are in tri-state and the CM2400-02/03/04 allows external signals ( ≤3.6V) to share these two lines. The CM2400-02/03/04 is designed to draw almost zero current from the D+ and D- lines while in sharing mode. In this mode, VP and VM are driven high while RCV and USB_DET are driven low. In Disable and Sharing Mode, all input/output pins fol- low the states defined in Table 2. Table 2: Pin States in Disable or Sharing Mode Table 3 lists the functions of the modes associated with suspend and OE pins. When Suspend is low and OE is high, signal levels on D+ and D- are determined by other USB devices and pull-up/down resistors. In Sus- pend Mode (SPND = HIGH) the differential receiver is inactive and output RCV is always LOW. Out of sus- pend signaling is detected via the single-ended receiv- ers VP and VM. During suspend and while the output is still enabled (OE = LOW), D+ and D- lines are driven to their intended states. Table 3: Function Selection. VBUS VCC CONFIGURATION Connected Connected Normal Mode Connected Not Connected Disable Mode Not Connected Connected Sharing Mode PIN Sharing Mode State Disable Mode State VBUS VBUS < 3.6V 4.1V to 5.5V VREG Pulled Down 3.3V Out VCC Present Not Present VPU High-Z (off) High-Z (off) D+, D- High-Z High-Z VP , VM HInvalid RCV L Invalid USB_DET L Invalid Inputs High-Z High-Z SUSPEND OE D+ / D- RCV VP/VM Function L L Driver & Receiver Active Active Active Normal driving mode. Differential receiver active L H Receiving Active Active Driver Tri-stated. Differential receiver active. H L Driving Inactive RCV=L Active Driving during ’suspend’. Differential receiver inactive. H H High-Z Inactive RCV=L Active Low-power state. |
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