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參數(shù)資料
| 型號： | MIC2550YTS TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB TRANSCEIVER 14-TSSOP |
| 標準包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | USB 2.0 |
| 電源電壓： | 4 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC2550YTSTR MIC2550YTSTR-ND |
MIC2550
Micrel, Inc.
M9999-031805
8
March 2005
Applications Information
The MIC2550 is designed to provide USB connectivity in
mobile systems where system supply voltages are not avail-
able to satisfy USB requirements. The MIC2550 can operate
down to supply voltages of 2.5V and still meet USB physical
layer specifications. As shown in the system diagram, the
MIC2550 takes advantage of USB’s supply voltage, V
BUS, to
operate the transceiver. The system voltage, V
IF, is used to
set the reference voltage used by the digital I/O lines (VP, VM,
RCV, OE#, SPD, and SUS pins) interfacing to the system.
Internal circuitry provides translation between the USB and
system voltage domains. V
IF will typically be the main supply
voltage rail for the system.
In addition, a 3.3V, 10% termination supply voltage, V
TRM, is
provided to support speed selection. A 0.47F (minimum)
capacitor from V
TRM to ground is required to ensure stability.
As shown in the typical application diagram, a 1F capacitor
is recommended. A 1.5K resistor is required between this pin
and the D+ or D– lines to respectively specify full-speed or
low-speed operation.
Power Supply Configurations
V
IF/VBUS Switched
When the V
BUS input pin is pulled to ground a low impedance
path between V
IF and VBUS can cause a high current flow
from V
IF to VBUS thereby damaging the MIC2550. This issue
can arise in systems where V
BUS is driven from a power
supply that can be switched off such as in the case of a
desktop PC. Adding a Schottky diode, such as the ZHCS1000
by Zetex, in series with V
BUS will prevent any current flow
during this condition. A solution is shown in Figure 8 below.
MIC2550
VIF
Note: *(Optional) See Text - Power Supply Configurations
VBUS
1F min
VBUS
USB Device
Power Controller
*(Optional)
D1
ZHCS1000 or
equivalent
Figure 8. Solution to V
IF/VBUS Switching
I/O Interface Using 3.3V
In systems where the I/O interface utilizes a 3.3V USB
controller, an alternate solution is shown in Figure 9. This
configuration has the advantage over Figure 8, in that no
extra components are needed. Ensure that the load on V
TRM
does not exceed 1mA total.
MIC2550
VIF
VBUS
I/O
VBUS
VP/VM/
RCV/OE#
VTRM
USB
Controller
VDD
3.3V
Figure 9. I/O Interface Uses 3.3V
Internal 3.3V Source
If the device is self-powered and has 3.3V available, the
circuit in Figure 10 is yet another power supply configuration
option. In this configuration, the internal regulator is disabled
and the 3.3V source and not V
BUS powers the entire chip.
MIC2550
VIF
3.3V
VBUS
VTRM
Figure 10. Powering Chip
from Internal 3.3V Source
Suspend
When the suspend pin (SUS) is high, power consumption is
reduced to a minimum. V
TRM is not disabled. RCV, VP and VM
are still functional to enable the device to detect USB activity.
For minimal current consumption in suspend mode, it is
recommended that OE# = 1.
External ESD Protection
The use of ESD transient protection devices is not required
for operation, but is recommended. We recommend the
following devices or the equivalent:
Cooper Electronics Technologies (www.cooperet.com)
41206ESDA SurgX
0805ESDA SurgX
Littelfuse (www.littelfuse.com)
V0402MHS05
SP0503BAHT
Non-Multiplexed Bus
To save pin count for the USB logic controller interface, the
MIC2550 was designed with V
P and VM as bidirectional pins.
To interface the MIC2550 with a non-multiplexed data bus,
resistors can be used for low cost isolation as shown in
Figure 11.
VPO
VP
VM
VMO
USB Logic
Controller
(SIE)
MIC2550
VP
VM
10k
Figure 11. MIC2550 Interface to
Non-Multiplexed Data Bus
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