ISP1161 datasheet(39/127 Pages) PHILIPS

39 / 127 page

Philips Semiconductors

ISP1161

Full-speed USB single-chip host and device controller

Product data

Rev. 01 — 3 July 2001

39 of 130

9397 750 08313

9.8.2

Using external OC detection circuit

When VCC (pin 56) is connected to the +3.3 V power supply instead of the +5 V

power supply, then the internal OC detection circuit cannot be used. An external OC

detection circuit must be used instead. Nevertheless, regardless of VCC’s

connections, an external OC detection circuit can be used from time to time. To use

an external OC detection circuit, AnalogOCEnable, bit 10 of the

HcHardwareConﬁguration register, should be set to logic 0. By default after reset, this

bit is already set to logic 0; therefore, the HC Driver does not need to clear this bit.

Figure 36 shows how to use an external OC detection circuit.

Fig 35. Using internal OC detection circuit.

MGT960

ATX

≥

Reg

PSW

OC select

OC detect

regulator

VCC

H_OCn

∆V = +5 V − VBUS

H_PSWn

H_DMn

H_DPn

HC CORE

C/L

SIE

USB

downstream

port

connector

15 k

Ω

×)

47 pF

×)

Ω

ISP1161

VBUS

+5 V

P-Ch

MOSFET

(PHP109)

bit 10

bit 12

HcHardware

Configuration

HcHardware

Configuration

ISP1161 Datasheet(PDF) 39 Page - NXP Semiconductors

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