CM2400-05 Datasheet, PDF (10/13 Pages) California Micro Devices Corp – Universal Serial Bus Transceiver with Level Translator

PRELIMINARY
CM2400-05
Functional Description
The CM2400-05 USB Transceiver supports 3 different
power supply configurations, which can be configured
dynamically. Table 1 details the various configurations.
In Normal Mode the internal regulator produces 3.3V
from V_BUS to power the internal drivers and receivers
associated with the USB protocol.
V_BUS
Connected
Connected
Not Connected
V_CC
Connected
Not Connected
Connected
CONFIGURATION
Normal Mode
Disable Mode
Sharing Mode
Table 1: Power Supply Connections
In Disable and Sharing Mode, all input/output pins fol-
low the states defined in Table 2. In Sharing mode, D+,
D- and V_PU can have voltages higher then V_CC. This
allows other external signals to share D+ and D- while
USB signaling is disabled.
PIN
V_BUS
V_REG
V_CC
V_PU
D+, D-
V_P/V_PO, V_M/V_MO
RCV
USB_DET
Inputs
Sharing Mode
State
V_BUS < 3.6V
Pulled Down
Present
High-Z (off)
High-Z
H
L
L
High-Z
Disable Mode
State
4.1V to 5.5V
3.3V Out
Not Present
High-Z (off)
High-Z
Invalid
Invalid
Invalid
High-Z
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 V_P and V_M. During suspend and while the output is
still enabled (OE = LOW), D+ and D- lines are driven to
their intended states. This is permitted because driving
during suspend is used to signal remote wake-up by
driving a 'K' signal for a period of 1 to 15ms.
SUSPEND OE
D+ / D-
L
L Driver & Receiver Active
RCV
Active
V_P/V_PO,V_M/V_MO
Input
L
H
Receiving
Active
Output
H
L
H
H
Driving
High-Z
Inactive
RCV=L
Input
Inactive
RCV=L
Output
Table 3: Function Selection.
Function
Normal driving mode. Differential
receiver active
Driver Tri-stated. Differential receiver
active.
Driving during ’suspend’. Differential
receiver inactive.
Low-power state.
© 2004 California Micro Devices Corp. All rights reserved.
10 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: [phone] ● Fax: [phone] ● www.calmicro.com 06/30/04