TUSB5052PZ datasheet(42/82 Pages) TI

tên linh kiện	TUSB5052PZ

Giải thích chi tiết về linh kiện	USB TO 2-SERIAL PORT CONTROLLER WITH CONFIGURABLE OPTIONAL HUB

PDF	82 Pages

Scroll/Zoom	100%

nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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42 / 82 page

5−8

USBCTL Register

GLOBCTL Register

PURS

USBR

RESET

MCU

FRSTE

USB Function Reset

To Internal MMRs

RSTI

RSTO

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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