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参数资料
| 型号： | MAX3341EEUD |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 其它接口 |
| 英文描述： | 【15kV ESD-Protected USB Level Translator in UCSP with USB Detect |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO16 |
| 封装： | 4.40 MM, MO-153AB, TSSOP-16 |
| 文件页数： | 7/15页 |
| 文件大小： | 349K |
| 代理商： | MAX3341EEUD |
Device Control
D+ and D-
D+ and D- are the USB side transmitter I/O connec-
tions, and are ESD protected to ±15kV using the
Human Body Model, ±15kV using IEC 1000-4-2 Air-
Gap Discharge, and ±8kV using IEC 1000-4-2 Contact
Discharge, making the MAX3341E ideal for applications
where a robust transmitter is required. A 23.7
resistor
is required on D+ and D- for normal operation (see
External Resistors
).
The MAX3341E contains unique circuitry to ensure the
USB skew is independent of the input skew on VPO
and VMO. Input skews of up to 10ns are ignored and
do not show up on the output.
ENUM
USB specification 2.0 requires a 1.5k
pullup resistor
on D+ for full-speed (12Mbps) operation. Controlled by
enumerate (ENUM), the MAX3341E provides this inter-
nal 1.5k
resistor. Drive ENUM high to connect the
pullup resistor from D+ to VTRM. Drive ENUM low to
disconnect the pullup resistor from D+ to VTRM.
VPO/VMO, VPI/VMI, and
OE
The MAX3341E system-side inputs are VPO and VMO.
Data from an ASIC comes into the MAX3341E through
VPO and VMO. VPO and VMO operate either differen-
tially with VPO as the positive terminal and VMO as the
negative terminal, or single ended with VPO as the data
input (see
MODE
section).
The MAX3341E system-side outputs are VPI, VMI, and
RCV. The MAX3341E sends data to an ASIC through
VPI, VMI, and RCV. VPI and VMI are outputs to the
single-ended receivers and RCV is the output of the dif-
ferential receiver.
Output enable (
OE
) controls data transmission. Drive
OE
low to enable data transmission on D+ and D-.
Drive
OE
high to disable data transmission or receive
data.
MODE
MODE is a control input that selects whether differential
or single-ended logic signals are recognized by the
system side of the MAX3341E. Drive MODE high to
select differential mode with VPO as the positive termi-
nal and VMO as the negative terminal. Drive MODE low
to select single-ended mode with VPO as the data input
(Table 1).
VTRM
VTRM is the 3.3V output of the internal linear voltage
regulator. VTRM powers the internal circuitry of the USB
side of the MAX3341E. Connect a 1μF (min) low-ESR
ceramic or plastic capacitor from VTRM to GND, as
close to VTRM as possible.
V
CC
In most applications, V
CC
is derived from the USB 5V out-
put. If supplying V
CC
with an alternative power supply
such as a lithium-ion battery, the V
CC
input range is 4.0V
to 5.5V. If V
CC
drops below 4.0V, supply current drops
to 10μA avoiding excessive battery drain, and D+/D-
enter a high-impedance state allowing other devices to
drive the lines. Bypass V
CC
to GND with a 1μF ceramic
capacitor as close to the device as possible.
USB Detect
USB detect output (USB_DET) signals to the ASIC that
V
CC
is present. A high at USB_DET indicates that V
CC
is present, while a low at USB_DET indicates that V
CC
is not present.
SUSP
Suspend (SUSP) is a control input. Force SUSP high to
place the MAX3341E in a low-power state. In this state,
the quiescent supply current into V
CC
is less than 50μA
and RCV goes low.
In suspend mode, VPI and VMI remain active as
receive outputs and VTRM stays on. The MAX3341E
continues to receive data from the USB, allowing the μP
to sense activity on the D+/D- lines and wake up the
MAX3341E.
The MAX3341E can also transmit data to D+ and D-
while in suspend mode. This function is used to signal a
remote wakeup by driving a signal on D+ and D- for a
period of 1ms to 15ms. Slew rate control is not active
during suspend mode, and data can only be sent at
data rates up to 200kps.
Data Transfer
Receiving Data from the USB
Data received from the USB are output to VPI/VMI in
either of two ways, differentially or single ended. To
receive data from the USB, force
OE
high and SUSP
low. Differential data arriving at D+/D- appear as differ-
ential logic signals at VPI/VMI, and as a single-ended
logic signal at RCV. If both D+ and D- are low, then VPI
and VMI are low, signaling a single-ended zero condi-
tion on the bus; RCV is undefined (Table 1).
Transmitting Data to the USB
The MAX3341E outputs data to the USB differentially on
D+ and D-. The logic driving signals may be either dif-
ferential or single ended. For sending differential logic,
force MODE high, force
OE
and SUSP low, and apply
data to VPO and VMO. D+ then follows VPO, and D-
follows VMO. To send single-ended logic signals, force
M
±15kV ESD-Protected USB Level Translator in
UCSP with USB Detect
_______________________________________________________________________________________
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| MAX3341EEUE | 制造商:Maxim Integrated Products 功能描述:+/-15KV ESD-PROTECTED USB LEVEL TRANSLATOR IN - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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