參數資料
型號： ISP1761
廠商： NXP Semiconductors N.V.
英文描述： Hi-Speed Universal Serial Bus On-The-Go controller
中文描述： 高速通用串行總線和On - The - Go控制器
文件頁數： 29/158頁
文件大?。?/td> 724K
代理商： ISP1761
9397 750 13258
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 12 January 2005
29 of 158
Philips Semiconductors
ISP1761
Hi-Speed USB OTG controller
7.8 Overcurrent detection
The ISP1761 can implement a digital or analog overcurrent detection scheme. Bit 15 of
the HW Mode Control register can be programmed to select the analog or digital
overcurrent detection. An analog overcurrent detection circuit is integrated on-chip. The
main features of this circuit are self reporting, automatic resetting, low-trip time and low
cost. This circuit offers an easy solution at no extra hardware cost on the board. The port
power will be automatically disabled by the ISP1761 on an overcurrent event occurrence,
by deasserting the PSWn_N signal without any software intervention.
When using the integrated analog overcurrent detection, the range of the overcurrent
detection voltage for the ISP1761 is 45 mV to 90 mV. Calculation of the external
components should be based on the 45 mV value, with the actual overcurrent detection
threshold usually positioned in the middle of the interval.
For an overcurrent limit of 500 mA per port, a PMOS transistor with R
DSON
of
approximately 100 m
is required. If a PMOS transistor with a lower R
DSON
is used, the
analog overcurrent detection can be adjusted using a series resistor; see
Figure 10
.
V
PMOS
=
V
OC(TRIP)
=
V
TRIP(intrinsic)
(I
OC(nom)
×
R
td
), where:
V
PMOS
= voltage drop on PMOS
I
OC(nom)
= 1
μ
A.
The digital overcurrent scheme requires using an external power switch with integrated
overcurrent detection, such as: LM3526, MIC2526 (2 ports) or LM3544 (4 ports). These
devices are controlled by PSWn_N signals corresponding to each port. In the case of
overcurrent occurrence, these devices will assert OCn_N signals. On OCn_N assertion,
the ISP1761 cuts off the port power by deasserting PSWn_N. The external integrated
power switch will also automatically cut-off the port power in the case of an overcurrent
event, by implementing a thermal shutdown. An internal delay filter of 1 ms to 3 ms will
prevent false overcurrent reporting because of in-rush currents when plugging a USB
device.
(1) R
td
is optional.
Fig 10. Adjusting analog overcurrent detection limit (optional)
004aaa662
REF5V
R
td(1)
5 V
ISP1761
OCn_N
PSWn_N
I
OC
相關PDF資料
PDF描述
ISP1761BE Hi-Speed Universal Serial Bus On-The-Go controller
ISP1761ET Hi-Speed Universal Serial Bus On-The-Go controller
ISP2100A Telecommunication IC
ISP2100BN4 Microprocessor
ISP2300 Controller Miscellaneous - Datasheet Reference
相關代理商/技術參數
參數描述
ISP1761BE 功能描述:USB 接口集成電路 USB HS OTG CTRLR RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1761BE,518 功能描述:USB 接口集成電路 USB HS OTG CONTROLLER RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1761BE,551 功能描述:USB 接口集成電路 DO NOT USE ORDER -T OR NO "-" RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1761BE,557 功能描述:USB 接口集成電路 USB HS OTG CTRLR RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1761BE518 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB OTG 128LQFP
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