PRELIMINARY
CM2400-02/03/04
Functional Description (cont’d)
Detailed in Table 4 and Table 5 are the operating
modes for the CM2400-02/03/04. The CM2400-02 fea-
tures a fixed, single-ended input operating mode which
is summarized in Table 4. The CM2400-03 features a
differential-pair input operating mode which is summa-
rized in Table 5. The CM2400-04 input mode is select-
able via the MODE input. Table 4 and Table 5
summarize both operating modes for the CM2400-04.
Table 6 details the receiving function when OE is HIGH
(driver disabled). RCV denotes the signal level on the
output RCV just before an SE0 state occurs. This level
is stable during the SE0 period.
VP
VM
D+/D-
RCV
L
Differential Logic ’0’
Differential Logic ’1’
SE0
L
H
L
H
L
L
H
On the CM2400-02, the two driver inputs function as
V
and FSE0 inputs. On the CM2400-03, the driver
RCV*
O
inputs function as V
and V . On the CM2400-04,
MO
PO
* Denotes RCV is stable in last state before SE0 condition.
when the MODE input is HIGH, differential-pair input
mode is selected and the two driver inputs function as
Table 6: Receiving Function (SPND = L)
A regulator bypass option can be utilized by shorting
VBUS to VREG and connecting to a 3.3v supply.
V
and V . When MODE is LOW, the single-ended
PO
MO
input data interface mode is selected and the two driver
inputs function as V and FSE0.
O
VO (VPO
)
FSE0 (VMO)
MODE
Result
Logic ‘0’
SE0
L
L
L
L
H
L
(single-ended)
H
H
Logic ‘1’
SE0
H
Table 4: Single-ended Input Operating Mode,
CM2400-02 and CM2400-04 in Single-ended
Input Mode (OE = L)
VO (VPO
)
FSE0 (VMO)
MODE
Result
SE0
H
L
L
L
H
L
(differential)
Logic ‘0’
Logic ‘1’
Undefined
H
H
H
Table 5: Differential-pair Input Operating Mode,
CM2400-03 and CM2400-04 in Differential-pair
Input Mode (OE = L)
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08/24/04
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
