參數(shù)資料
型號: ISP1520BD,557
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數(shù): 37/54頁
文件大小: 288K
代理商: ISP1520BD,557
ISP1520_4
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 28 April 2006
41 of 53
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
16. Application information
16.1 Descriptor conguration selection
16.2 Overcurrent detection limit adjustment
For an overcurrent limit of 500 mA per port, a PMOS with RDSon of approximately 100 m
is required. If a PMOS with a lower RDSon is used, analog overcurrent detection can be
adjusted by using a series resistor; see Figure 18.
V
PMOS = Vtrip = Vtrip(intrinsic) (IOC(nom) × Radj(oc)), where:
V
PMOS = voltage drop on PMOS
IOC(nom) = 0.6 A.
The I2C-bus cannot be shared between the EEPROM and the external microcontroller; see Table 11.
(1) The function on port 4, which is a nonremovable port, is optional.
Fig 17. Descriptors conguration selection application diagram
004aaa303
ISP1520
ROM
external microcontroller
acting as I2C-bus master
USB function
EEPROM
I2C-bus
four 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) Radj(oc) is optional.
Fig 18. Adjusting analog overcurrent detection limit (optional)
004aaa259
VREF(5V0)
Radj(oc)(1)
5 V
ISP1520
OCn_N
PSWn_N
IOC
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