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GL850 Datasheet(PDF) 19 Page - List of Unclassifed Manufacturers |
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GL850 Datasheet(HTML) 19 Page - List of Unclassifed Manufacturers |
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19 / 40 page  GL850 USB 2.0 4-Port HUB Controller ©2000-2003 Genesys Logic Inc.—All rights reserved. Page 19 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 Vbus(5V) AVDD(3.3V) 1.5K ohm RPU DPF0 Inside GL850 On PCB C R RESET# 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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