gl850g Genesys Logic, gl850g Datasheet - Page 19

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gl850g

Manufacturer Part Number
gl850g
Description
Gl850g Usb 2.0 Low-power Hub Controller
Manufacturer
Genesys Logic
Datasheet

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©2000-2008 Genesys Logic Inc. - All rights reserved.
To fully control the reset process of GL850G, we suggest the reset time applied in the external reset circuit
should longer than that of the internal reset circuit.
To save pin count, GL850G uses the same pin to decide individual/gang mode as well as to output the
suspend flag. The individual/gang mode is decided within 20us after power on reset. Then, about 50ms later,
this pin is changed to output mode. GL850G outputs the suspend flag once it is globally suspended. For
individual mode, a pull low resister greater than 100K
resister greater than 100K
schematics. It should be noticed that the polarity of LED must be followed, otherwise the suspend current
will be over spec limitation (2.5mA).
5.2.2 PGANG/SUSPND Setting
Internal reset
External reset
GL850G internally contains a power on reset circuit as depicted in the picture above
V
V
BUS
BUS
(External 5V)
(External 5V)
Figure 5.4 – Power on sequence of GL850G
should be placed. In figure 5.5, we also depict the suspend LED indicator
Figure 5.3 – Power on reset diagram
C
C
1
1
2.7
Power good voltage, 2.5~2.8V
PCB
PCB
μ
s
R
R
R
R
1
1
2
2
GL850G USB 2.0 Low-Power HUB Controller
Silicon
Silicon
RESETJ pin (Low active)
RESETJ pin (Low active)
EXT
EXT
OR
OR
INT
INT
should be placed. For gang mode, a pull high
Power good reset circuit
Power good reset circuit
(connected to internal 3.3V)
(connected to internal 3.3V)
Reset
Reset
DVDD
Page 19

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