![background image](http://html.mh-extra.com/html/nec/multisync-fp1355-fp1355-fp1355/multisync-fp1355-fp1355-fp1355_service-manual_1667336064.webp)
1 - 58
1.10 USB circuit
1.10.1 Outline
This monitor loads the standard USB SELF POWERED HUB with 1 upstream and 3
downstreams.
(1) Serial data bus
Data bus is connected from upstream connector J1A0 to upstream port of HUB controller
IC1A0, and downstream connector J1A1 and J1A2 are connected from HUB controller.
HUB controller relays data communication between the upstream side (PC) and the down-
stream side (device).
(2) Power supply to downstream
USB HUB of this monitor is SELF POWERED HUB, and it can supply the power of +5V
500mA (max) to each downstream from transformer T902 on PWB-MAIN. Further, HUB
controller IC1A0 has the function of detecting overcurrent, and stops supplying the power
to each downstream port when overcurrent (500mA or more) is detected at each port.
1.10.2 USB downstream power supply
(1) Supply of Vpp power
When HUB controller IC1A0 is recognized from the direction of upstream, the signal which
functions as a switch of power output for a downstream port is output (IC1A0 #2, 16, 32).
When IC1A0 #2, 16 and 32 become LOW, FET gates are turned ON, and EFT transistors
Q1A1, Q1A2 and Q1A3 supply the power to the downstream ports (J1A1 #1, #5, J1A2 #1)
respectively.
(2) Detection of overcurrent
HUB controller IC1A0 has the function of detecting ovecurrent. If the current output at each
port exceeds 550mA (min), gates of FET transistors Q1A1, Q1A2 and Q1A3 turn OFF
(HIGH), automatically output of current stops only to the port that overcurrent is detected.
In order to re-operate the port that overcurrent is detected, either of the followings should
be carried out:
1. OFF/ON of monitor power supply
2. Pulling-out and pulling-in of upstream cable
3. Restart of PC
1.10.3 HUB controller power output
HUB controller IC1A0 has a built-in 3.3V regulator, and outputs from IC1A0 #1.
Port on circuit diagram
port 1
port 2
port 3
Connector
J1A1
J1A2 (UP)
J1A2 (DOWN)
Silk indication
3
1
2
Downstream connection of HUB controller
Summary of Contents for MultiSync FP1355 FP1355 FP1355
Page 23: ...1 17 Q502 Q502 Damper diode Current waveform fh 106k ...
Page 25: ...1 19 Q502 Q502 Damper diode Current waveform Q502 Ic Q502 Vce ...
Page 58: ...1 52 Figure 25 IC211 MC13289ASP block diagram ...
Page 63: ...1 57 Figure 30 IC212 XC3824P2 block diagram ...
Page 65: ...1 59 1 11 Wave form of main circuit voltage ...
Page 66: ...1 60 ...
Page 67: ...1 61 ...
Page 68: ...1 62 ...
Page 69: ...1 63 ...
Page 70: ...1 64 ...
Page 71: ...1 65 ...
Page 72: ...1 66 ...
Page 73: ...1 67 ...
Page 74: ...1 68 ...
Page 75: ...1 69 ...
Page 76: ...1 70 ...
Page 77: ...1 71 ...
Page 78: ...1 72 ...
Page 79: ...1 73 ...
Page 80: ...1 74 ...
Page 81: ...1 75 ...
Page 120: ...MultiSync FP1355 User s Manual ...
Page 144: ... VSP C0464 REVISE 2 ...
Page 166: ...Fig 2 BEZEL LOGO VSP C0464 COLOR OF LETTERING Kingfisher Blue 6704 11 5 24 5 66 ...
Page 169: ...VSP C0464 Fig 5 1 PRINTING SPECIFICATION OF CARTON BOX North America ...
Page 170: ...VSP C0464 Fig 5 2 PRINTING SPECIFICATION OF CARTON BOX Europe ...
Page 198: ......
Page 199: ......
Page 200: ......
Page 201: ......
Page 202: ......
Page 203: ......
Page 204: ......
Page 205: ......
Page 206: ......
Page 207: ......