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TUSB5052PZ Datasheet(PDF) 42 Page - Texas Instruments

No. de pieza TUSB5052PZ
Descripción Electrónicos  USB TO 2-SERIAL PORT CONTROLLER WITH CONFIGURABLE OPTIONAL HUB
PDF  82 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TUSB5052PZ Datasheet(HTML) 42 Page - Texas Instruments

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5−8
USBCTL Register
GLOBCTL Register
PURS
USBR
RESET
MCU
FRSTE
USB Function Reset
To Internal MMRs
RSTI
RSTO
G2
8052
RST
TUSB5052
RSTO
RSTI
External Mode Connection
TUSB5052
RSTO
RSTI
Normal Mode Connection
Figure 5−1. Reset Diagram
5.15 Pullup Resistor Connect/Disconnect
TUSB5052 numeration can be activated by the MCU (there is no need to disconnect the cable physically). Figure 5−2
represents the implementation of the TUSB5052 Connect and Disconnect from a USB upstream port. When
CONT = 1 in the USBCTL register, the CMOS driver sources VDD 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
Ω
resistor is connected to GND, resulting in the device disconnection state. The PUR driver is a CMOS driver that can
provide (VDD-0.1)V minimum at 8-mA source current.
HUB
D+
D−
15 k
Ω
TUSB5052
1.5 k
Ω
CMOS
PUR
CONT-bit
DP0
DM0
Figure 5−2. Pullup Resistor Connect/Disconnect Circuit



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