CM2400-02 Datasheet, PDF (12/14 Pages) California Micro Devices Corp – Universal Serial Bus Transceiver with Level Translator

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.
On the CM2400-02, the two driver inputs function as
V_O and FSE0 inputs. On the CM2400-03, the driver
inputs function as V_PO and V_MO. On the CM2400-04,
when the MODE input is HIGH, differential-pair input
mode is selected and the two driver inputs function as
V_PO and V_MO. When MODE is LOW, the single-ended
input data interface mode is selected and the two driver
inputs function as V_O and FSE0.
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.
D+/D-
RCV
V_P
V_M
Differential Logic ’0’
L
L
H
Differential Logic ’1’ H
H
L
SE0
RCV* L
L
* Denotes RCV is stable in last state before SE0 condition.
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.
MODE
L
(single-ended)
V_O (V_PO)
L
L
FSE0 (V_MO)
L
H
Result
Logic ‘0’
SE0
H
L
Logic ‘1’
H
H
SE0
Table 4: Single-ended Input Operating Mode,
CM2400-02 and CM2400-04 in Single-ended
Input Mode (OE = L)
MODE
V_O (V_PO) FSE0 (V_MO) Result
H
L
(differential)
L
L
SE0
H
Logic ‘0’
H
L
Logic ‘1’
H
H
Undefined
Table 5: Differential-pair Input Operating Mode,
CM2400-03 and CM2400-04 in Differential-pair
Input Mode (OE = L)
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