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USB3320 数据表(PDF) 31 Page - Microchip Technology

部件名 USB3320
功能描述  Highly Integrated Full Featured Hi-Speed USB 2.0 ULPI Transceiver
PDF  70 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB3320 数据表(HTML) 31 Page - Microchip Technology

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 2014-2015 Microchip Technology Inc.
DS00001792B-page 31
USB3320
5.7
USB UART Support
The USB3320 provides support for the USB UART interface as detailed in the ULPI specification and the former CEA-
936A specification. The USB3320 can be placed in UART Mode using the method described in Section 6.5, and the
regulator output will automatically switch to the value configured by the UART RegOutput bits in the USB IO & Power
Management register. While in UART mode, the Linestate signals cannot be monitored on the DATA[0] and DATA[1]
pins.
5.8
USB Charger Detection Support
To support the detection and identification of different types of USB chargers the USB3320 provides integrated pull-up
resistors, RCD, on both DP and DM. These pull-up resistors along with the single ended receivers can be used to help
determine the type of USB charger attached. Reference information on implementing charger detection is provided in
Microchip Application Note AN 19.7 - Battery Charging Using Microchip USB Transceivers.
5.9
USB Audio Support
The USB3320 provides two low resistance analog switches that allow analog audio to be multiplexed over the DP and
DM terminals of the USB connector. The audio switches are shown in Figure 5.1. The electrical characteristics of the
USB Audio Switches are provided in Table 4-8.
FIGURE 5-12:
USB3320 DRIVES CONTROL SIGNAL (CPEN) TO EXTERNAL VBUS SWITCH
TABLE 5-8:
USB WEAK PULL-UP ENABLE
RESETB
DP Pullup Enable
DM Pullup Enable
00
0
1
ChargerPullupEnableDP
ChargerPullupEnableDM
Note:
ChargerPullupEnableDP
and ChargerPullupEnableDM are enabled in the USB IO & Power Management
register.
Note:
The USB3320 supports “USB Digital Audio” through the USB protocol in ULPI and USB Serial modes
described in Section 6.0.
VBUS
Switch
OUT
EN
IN
5V
USB Transceiver
VBUS
USB
Connector
DM
DP
VBUS
RVBUS
CPEN
Link
Controller
CPEN Logic
DrvVbusExternal
DrvVbus
DM
DP
ULPI
+5V
VBUS
Supply



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