gl850 ETC-unknow, gl850 Datasheet - Page 19

• Manufacturer Part Number: gl850
• Description: Usb 2.0 4-port Hub Controller
• Manufacturer: ETC-unknow

5.2 Configuration and I/O Settings
5.2.1 RESET# Setting
©2000-2003 Genesys Logic Inc.—All rights reserved.
When RESET# is low enabled, the whole chip is put in initial state. In addition, RPU will disable the
pull-up 1.5Kè resister to 3.3V, which causes GL850 seems to be disconnected to the host. We suggest
configure RESET# as following figure. Vbus is the 5V input from USB cable. GL850 will always be in
disconnected state when USB cable is not plugged into host, even that GL850 is powered.
GL850 internally contains a power on reset circuit. The power on sequence is depicted in the next picture.
To fully control the reset process of GL850, we suggest the reset time applied in the external reset circuit
should more than that of the internal reset circuit.
RESETI
Inside GL850
Figure 5.3 - RESET# (External Reset) setting and application
RPU
DPF0
RESET#
C
On PCB
GL850 USB 2.0 4-Port HUB Controller
R
Vbus(5V)
AVDD(3.3V)
1.5K ohm
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