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參數(shù)資料
| 型號： | MAX3349EA |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode |
| 中文描述： | USB 2.0全速收發(fā)器，提供UART復(fù)用模式 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 397K |
| 代理商： | MAX3349EA |
M
USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
______________________________________________________________________________________
11
USB Mode
The MAX3349EA is in USB mode when V
BUS
is greater
than V
TH-BUS
and the bus detect output (BD) is logic-
high. In USB mode, power for the MAX3349EA is
derived from V
BUS
, typically provided through the USB
connector. An internal linear regulator generates the
required +3.3V V
TRM
voltage from V
BUS
. V
TRM
powers
the internal USB transceiver circuitry and the D+ enu-
meration resistor. Bypass V
TRM
to GND with a 1μF
ceramic capacitor as close to the device as possible.
Do not power external circuitry from V
TRM
.
Disable Mode
Connect V
BUS
to a system power supply and leave V
L
unconnected or connect to ground to enter disable
mode. In disable mode, D+ and D- are high imped-
ance, and withstand external signals up to +5.5V.
OE
,
SUS, and control signals are ignored.
UART Mode
Connect V
L
and V
UART
to system power supplies, and
leave V
BUS
unconnected or below V
TH-BUS
to operate
the MAX3349EA in UART mode. The MAX3349EA sup-
ports V
UART
from +2.7V to +3.3V (see Table 1).
USB Control Signals
OE
OE
controls the direction of communication for USB
mode. When
OE
is logic-low, VP and VM operate as
logic inputs, and D+/D- are outputs. When
OE
is logic-
high, VP and VM operate as logic outputs, and D+/D-
are inputs. RCV is the output of the differential USB
receiver connected to D+/D-, and is not affected by the
OE
logic level.
ENUM
Drive ENUM logic-high to enable the internal 1.5k
pullup resistor from D+ to V
TRM
. Drive ENUM logic-low
to disable the internal pullup resistor and logically dis-
connect the MAX3349EA from the USB.
SUS
Operate the MAX3349EA in low-power USB suspend
mode by driving SUS logic-high. In suspend mode, the
USB differential receiver is turned off and V
BUS
con-
sumes 38μA (typ) of supply current. The single-ended
VP and VM receivers remain active to detect a SE0
state on USB bus lines D+ and D-. The USB transmitter
remains enabled in suspend mode to allow transmis-
sion of a remote wake-up on D+ and D-.
V
BUS
(V)
V
TRM
(V)
V
L
(V)
V
UART
(V)
CONFIGURATION
+4.0 to +5.5
+3.0 to +3.6 Output
+1.4 to +2.75
GND, Unconnected, or
+2.7V to +3.3V
USB Mode
+4.0 to +5.5
+3.0 to +3.6 Output
GND or Unconnected
GND, Unconnected, or
+2.7V to +3.3V
Disable Mode
GND or Unconnected
High Impedance
+1.4 to +2.75
+2.7V to +3.3V
UART Mode
Table 1. Power-Supply Configuration
INPUTS
OUTPUTS
VP
0
0
1
1
VM
0
1
0
1
D+
0
0
1
1
D-
0
1
0
1
Table 2. USB Transmit Truth Table (
OE
= 0)
INPUTS
OUTPUTS
VM
0
1
0
1
D+
0
0
1
1
D-
0
1
0
1
VP
0
0
1
1
RCV
RCV*
0
1
X
Table 3a. USB Receive Truth Table (
OE
= 1,
SUS = 0)
INPUTS
OUTPUTS
VM
0
1
0
1
D+
0
0
1
1
D-
0
1
0
1
VP
0
0
1
1
RCV
0
0
0
0
Table 3b. USB Receive Truth Table (
OE
= 1,
SUS = 1)
*
= Last state.
X = Undefined.
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