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
Sharing Mode
State
Disable Mode
State
PIN
VBUS
VREG
VCC
VBUS < 3.6V
Pulled Down
Present
4.1V to 5.5V
3.3V Out
from V
to power the internal drivers and receivers
BUS
associated with the USB protocol.
Not Present
High-Z (off)
VPU
High-Z (off)
VBUS
VCC
CONFIGURATION
Normal Mode
D+, D-
High-Z
H
High-Z
Invalid
Connected
Connected
Connected
Not Connected
Connected
VP/VPO, VM/VMO
Disable Mode
Sharing Mode
Not Connected
RCV
USB_DET
Inputs
L
L
Invalid
Invalid
High-Z
Table 1: Power Supply Connections
High-Z
In Disable and Sharing Mode, all input/output pins fol-
Table 2: Pin States in Disable or Sharing Mode
low the states defined in Table 2. In Sharing mode, D+,
D- and V
can have voltages higher then V . This
PU
CC
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-
allows other external signals to share D+ and D- while
USB signaling is disabled.
ers V and V . During suspend and while the output is
P
M
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.
VP/VPO,VM/VMO
SUSPEND OE
D+ / D-
RCV
Function
L
L
H
L
Driver & Receiver Active
Active
Input
Normal driving mode. Differential
receiver active
L
Receiving
Driving
Active
Output
Input
Driver Tri-stated. Differential receiver
active.
H
H
Inactive
RCV=L
Driving during ’suspend’. Differential
receiver inactive.
H
High-Z
Inactive
RCV=L
Output
Low-power state.
Table 3: Function Selection.
© 2004 California Micro Devices Corp. All rights reserved.
10 430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
06/30/04
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
