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TUSB2043 Datasheet(PDF) 14 Page - Texas Instruments

Part No. TUSB2043
Description  4-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TUSB2043 Datasheet(HTML) 14 Page - Texas Instruments

 
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TUSB2043
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS308A – FEBRUARY 1999 – REVISED AUGUST 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
self-powered hub, individual port power management
In a self-powered configuration, the TUSB2043 can be implemented for individual port-power management
when used with the TPS2044 because it is capable of supplying 500 mA of current to each downstream port
and can provide current limiting on a per port basis. When the hub detects a fault on a downstream port, power
is removed from only the port with the fault and the remaining ports continue to operate normally. Self-powered
hubs are required to implement over-current protection and report overcurrent conditions. The SN75240
transient suppressors reduce inrush current and voltage spikes on the data lines.
48-MHz Clock
Source
BUSPWR
DP1
DM1
DP2
DM2
DP3
DM3
DP4
PWRON1
PWRON2
PWRON3
PWRON4
OVRCUR1
OVRCUR2
OVRCUR3
OVRCUR4
DM4
DP0
DM0
VCC
GND
CLKIN
MODESLCT
EXTMEM
RESET
5 V
3.3 V
GND
D +
D –
Upstream
Port
3.3 V LDO§
SN75240†
EN1
OC1
D +
D –
5 V
GND
D +
D –
5 V
D +
D –
5 V
D +
D –
5 V
Downstream
Ports
5-V Board Power
Supply
TUSB2043
TPS2044†
A
B
C
D
100
µF
SN75240†
A
B
C
D
GND
GND
GND
100
µF
100
µF
100
µF
Figure 10. TUSB2043 Self-Powered Hub, Individual Port-Power Management Application
† TPS2042 and SN75240 are Texas Instruments devices. Two TPS2042 devices can be
substituted for the TPS2044.
‡ 120
µF per hub is the minimum required per the USB specification, version 1.1. However, TI recommends a 100 µF low ESR tantulum
capacitor per port for immunity to voltage droop.
SN75240†
A
B
5 V
GND
C
D
4.7
µF
0.1
µF
4.7
µF
EN2
EN3
EN4
OC2
OC3
OC4
OUT4
OUT3
OUT2
OUT1
EEDATA/GANGED
System
Power-On Reset
IN1
0.1
µF
IN2
§ LDO is a 5 V to 3.3 V voltage regulator
15 k
15 k
3.3 V
1.5 k
3.3 V
0.1
µF
1 k
15 k
15 k
15 k
15 k
15 k
15 k


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