ISP1521BEUM ST-Ericsson Inc, ISP1521BEUM Datasheet - Page 14

• Manufacturer Part Number: ISP1521BEUM
• Description: IC USB HUB CONTROLLER HS 80-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1521BEUM

• Controller Type: USB Hub
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: 568-1884-2; ISP1521BE,518; ISP1521BE-T

Table 5.
CD00222695
Product data sheet
Power switching mode
None
Ganged
Individual
Fig 5.
Fig 6.
(1) Includes PCB traces, ferrite beads, and so on.
(1) Includes PCB traces, ferrite beads, and so on.
POWER SUPPLY
± 3 % regulated
5.1 V KICK-UP
Typical voltage drop components in self-powered mode using individual overcurrent detection
Typical voltage drop components in self-powered mode using global overcurrent detection
Power switching mode: pin configuration
POWER SUPPLY
± 3 % regulated
8.1.3 Overcurrent protection mode
5 V
+
−
For global overcurrent detection, an increased voltage drop is needed for the overcurrent
sense device (in this case, a low-ohmic resistor). This can be realized by using a special
power supply of 5.1 V ± 3 %, as shown in
The PCB resistance may cause a drop of 25 mV, which leaves 75 mV for the power switch
and overcurrent sense device.
PSWn_N pins have integrated weak pull-up resistors inside the chip.
The ISP1521 supports all overcurrent protection modes: none, global and individual.
No overcurrent protection mode reporting is selected when pin NOOC = HIGH. Global
and individual overcurrent protection modes are selected using pins PSWn_N, following
power switching modes selection scheme; see
4.95 V(min)
+
−
PSW1_N
ground
internal
pull-up
internal
pull-up
4.85 V (min)
for overcurrent
sense resistor
voltage drop
low-ohmic
detection
100 mV
PSW2_N
ground
ground
internal
pull-up
power switch
(PSWn_N)
ISP1521
ISP1521 power
Rev. 07 — 4 February 2010
voltage drop
(PSWn_N)
75 mV
switch
PMOS switch
low-ohmic
PSW3_N
ground
ground
internal
pull-up
voltage drop
75 mV
PMOS switch
low-ohmic
resistance
voltage drop
hub board
25 mV
PSW4_N
ground
ground
internal
pull-up
Figure
resistance
voltage drop
hub board
(1)
25 mV
Table
6.
4.75 V (min)
(1)
6.
4.75 V(min)
PSW5_N
ground
ground
internal
pull-up
Hi-Speed USB hub controller
V
D+
D−
GND
SHIELD
BUS
004aaa264
V
D+
D−
GND
SHIELD
BUS
004aaa265
PSW6_N
ground
ground
internal
pull-up
© ST-ERICSSON 2010. All rights reserved.
downstream
connector
ISP1521
port
downstream
connector
port
PSW7_N
ground
ground
internal
pull-up
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