參數(shù)資料
型號(hào)： ISP1521BE
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Hi-Speed Universal Serial Bus hub controller
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP80
封裝： 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-315-1, LQFP-80
文件頁數(shù)： 15/53頁
文件大小： 270K
代理商： ISP1521BE
Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
15 of 53
9397 750 13702
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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
Figure 6
.
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.
9.1.3
Overcurrent protection mode
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 the power switching modes selection scheme; see
Table 6
.
For the global overcurrent protection mode, only PSW1_N and OC1_N are active;
that is, in this mode, the remaining overcurrent indicator pins are disabled. To inhibit
the analog overcurrent detection, the OC_N pins must be connected to V
REF(5V0)
.
(1) Includes PCB traces, ferrite beads, and so on.
Fig 5.
Typical voltage drop components in the self-powered mode using individual overcurrent detection.
5 V
POWER SUPPLY
±
3 % regulated
+
4.85 V (min)
004aaa264
low-ohmic
PMOS switch
ISP1521
power switch
(PSWn_N)
VBUS
D
+
D
GND
SHIELD
4.75 V (min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
(1)
(1) Includes PCB traces, ferrite beads, and so on.
Fig 6.
Typical voltage drop components in the self-powered mode using global overcurrent detection.
5.1 V KICK-UP
POWER SUPPLY
±
3 % regulated
+
4.95 V(min)
004aaa265
low-ohmic
PMOS switch
VBUS
D
+
D
GND
SHIELD
4.75 V(min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
low-ohmic
sense resistor
for overcurrent
detection
voltage drop
100 mV
(1)
ISP1521 power
switch
(PSWn_N)
Table 5:
Power switching mode
None
Ganged
Power switching mode: pin configuration
PSW1_N
ground
internal
pull-up
internal
pull-up
PSW2_N
ground
ground
PSW3_N
ground
ground
PSW4_N
ground
ground
PSW5_N
ground
ground
PSW6_N
ground
ground
PSW7_N
ground
ground
Individual
internal
pull-up
internal
pull-up
internal
pull-up
internal
pull-up
internal
pull-up
internal
pull-up
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