GL850 View Datasheet(PDF) - Genesys Logic
Part Name
Description
MFG CO.
'GL850' PDF : 40 Pages View PDF
GL850 USB 2.0 4-Port HUB Controller
5.2 Configuration and I/O Settings
5.2.1 RESET# Setting
When RESET# is low enabled, the whole chip is put in initial state. In addition, RPU will disable the
pull-up 1.5KΩ 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.
RESETI
RESET#
C
Vbus(5V)
R
AVDD(3.3V)
1.5K ohm
RPU
Inside GL850
DPF0
On PCB
Figure 5.3 - RESET# (External Reset) setting and application
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.
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