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
Power good voltage, 2.5~2.8V
VCC(3.3V)
Internal reset
≒ 2.7 μs
External reset
Figure 5.4 - Power on sequence of GL850
5.2.2 PGANG/SUSPND Setting
To save pin count, GL850 uses the same pin to decide individual/gang mode as well as to output the
suspend flag. The individual/gang mode is decided in the period of 1ms after power on reset. After that
period of time, this pin is changed to output mode. GL850 outputs the suspend flag once it is globally
suspended. For individual mode, a pull low resister greater than 100KΩ should be placed. For gang mode,
a pull high resister greater than 100KΩ should be placed. In figure 5.6, we also depict the suspend LED
indicator schematics. It should be noticed that the polarity of LED must be followed, otherwise the suspend
current will be over than the current limitation (2.5mA).
RESET#
1 ms
GANG_CTL
Input mode, strapping
to decide individual or
gang mode
Output mode, indicating
GL850 is in normal
mode or suspend mode
Figure 5.5 - Timing of PGANG/SUSPND strapping
©2000-2003 Genesys Logic Inc.—All rights reserved.
Page 20
Share Link: 
