ISP1521BE ST-Ericsson Inc, ISP1521BE Datasheet - Page 15

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ISP1521BE

Manufacturer Part Number
ISP1521BE
Description
IC USB HUB CONTROLLER HS 80-LQFP
Manufacturer
ST-Ericsson Inc
Datasheet

Specifications of ISP1521BE

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
568-1170
ISP1521BE,557

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Philips Semiconductors
Table 5.
ISP1521_4
Product data sheet
Power switching mode
None
Ganged
Individual
Fig 5. Typical voltage drop components in self-powered mode using individual overcurrent detection
Fig 6. Typical voltage drop components in self-powered mode using global overcurrent detection
(1) Includes PCB traces, ferrite beads, and so on.
(1) Includes PCB traces, ferrite beads, and so on.
POWER SUPPLY
5.1 V KICK-UP
3 % regulated
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
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
voltage drop
(PSWn_N)
Rev. 04 — 30 March 2006
3 %, as shown in
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
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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
downstream
connector
ISP1521
port
downstream
connector
port
PSW7_N
ground
ground
internal
pull-up
14 of 55

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