參數(shù)資料
型號(hào): TUSB5052B
廠商: Texas Instruments, Inc.
英文描述: USB to 2-Serial + 1-Parallel Controller With Configurable Optional Hub
中文描述: USB轉(zhuǎn)2 -串行接口1 -可配置可選并行控制器集線器
文件頁(yè)數(shù): 40/84頁(yè)
文件大?。?/td> 276K
代理商: TUSB5052B
5–8
USBCTL Register
GLOBCTL Register
PURS
USBR
RESET
MCU
FRSTE
USB Function Reset
To Internal MMR’s
RSTI
RSTO
G2
8052
RST
TUSB5152
RSTO
RSTI
External Mode Connection
TUSB5152
RSTO
RSTI
Normal Mode Connection
Figure 5–1. Reset Diagram
5.15 Pullup Resistor Connect/Disconnect
TUSB5152 numeration can be activated by the MCU (there is no need to disconnect the cable physically). Figure 5–2
represents the implementation of the TUSB5152 Connectand Disconnectfrom a USB upstream port. When
CONT = 1 in the USBCTL register, the CMOS driver sources V
DD
to the pullup resistor (PUR pin) presenting a normal
connect condition to the USB hub (high speed). When CONT = 0, the PUR pin is driven low. In this state, the 1.5-k
resistor is connected to GND, resulting in the device disconnectionstate. The PUR driver is a CMOS driver that can
provide (V
DD
-0.1)V minimum at 8-mA source current.
HUB
D+
D–
15 k
TUSB5152
1.5 k
CMOS
PUR
CONT-bit
DP0
DM0
Figure 5–2. Pullup Resistor Connect/Disconnect Circuit
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