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USB3370 Datasheet(PDF) 61 Page - Microchip Technology

Part # USB3370
Description  Enhanced Single Supply Hi-Speed USB ULPI Transceiver
PDF  75 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB3370 Datasheet(HTML) 61 Page - Microchip Technology

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2012 - 2015 Microchip Technology Inc.
DS00001915B-page 61
USB3370
8.0
APPLICATION NOTES
8.1
Application Diagrams
The USB3370 requires few external components as shown in the application diagrams. The USB 2.0 Specification
restricts the voltage at the VBUS pin to a maximum value of 5.25V. In some applications, the voltage will exceed this
limit, so the USB3370 provides an integrated over voltage protection circuit. The over voltage protection circuit works
with an external resistor (RVBUS) to lower the voltage at the VBUS pin.
TABLE 8-1:
COMPONENT VALUES IN APPLICATION DIAGRAMS
Reference
Designator
Value
Description
Notes
COUT
See Table 4-10
Bypass capacitor to ground (<1
Ω ESR) for
regulator stability.
Place as close as possible to the
PHY.
CVBUS
See Table 8-2
Capacitor to ground required by the USB
Specification. Microchip recommends <1
Ω
ESR.
Place near the USB connector.
CBYP
System
dependent.
Bypass capacitor to ground. Typical
values used are 0.1 or 0.01
μF.
Place as close as possible to the
PHY.
CDC_LOAD
System
dependent.
The USB connector housing may be AC-
coupled to the device ground.
Industry convention is to ground
only the host side of the cable
shield.
RVBUS
1k
Ω or 20kΩ
Series resistor to work with internal over
voltage protection.
See Section 5.7.3.4 for information
regarding power dissipation.
RBIAS
10k
Ω (±1%)
Series resistor to establish reference
voltage.
See Section 5.3 for information
regarding power dissipation.
TABLE 8-2:
CAPACITANCE VALUES AT VBUS OF USB CONNECTOR
MODE
MIN Value
MAX Value
Host
120
μF
Device
1
μF10μF
OTG
1
μF6.5μF



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