參數(shù)資料
型號(hào): ISP1520
廠商: NXP Semiconductors N.V.
英文描述: Hi-Speed Universal Serial Bus hub controller
中文描述: 高速通用串行總線控制器樞紐
文件頁(yè)數(shù): 42/51頁(yè)
文件大?。?/td> 259K
代理商: ISP1520
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
Product data
Rev. 02 — 04 May 2004
42 of 51
9397 750 11689
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
17. Application information
17.1 Descriptor configuration selection
17.2 Overcurrent detection limit adjustment
For an overcurrent limit of 500 mA per port, a PMOS with R
DSON
of approximately
100 m
is required. If a PMOS with a lower R
DSON
is used, analog overcurrent
detection can be adjusted by using a series resistor; see
Figure 18
.
V
PMOS
=
V
trip
=
V
trip(intrinsic)
(I
OC(nom)
×
R
td
), where:
V
PMOS
= voltage drop on PMOS
I
OC(nom)
= 0.6
μ
A.
The I
2
C-bus cannot be shared between the EEPROM and the external microcontroller; see
Table 11
.
(1) The function on port 4, which is a non-removable port, is optional.
Fig 17. Descriptors configuration selection application diagram.
004aaa303
ISP1520
ROM
external microcontroller
acting as I
C-bus master
USB function
EEPROM
I
2
C-bus
4 USB downstream facing ports
green and
amber LEDs,
port 1
green and
amber LEDs,
port 2
green and
amber LEDs,
port 3
green and
amber LEDs,
port 4(1)
upstream
facing port GoodLink
(1) R
td
is optional.
Fig 18. Adjusting analog overcurrent detection limit (optional).
004aaa259
VREF(5V0)
Rtd(1)
5 V
ISP1520
OCn_N
PSWn_N
IOC
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