ISP1161ABD datasheet(39/134 Pages) PHILIPS

Part #	ISP1161ABD

Description	Full-speed Universal Serial Bus single-chip host and device controller

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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39 / 134 page

Philips Semiconductors

ISP1161A

Full-speed USB single-chip host and device controller

Product data

Rev. 03 — 23 December 2004

39 of 134

9397 750 13962

9.8 OC detection and power switching control

A downstream port provides 5 V power supply to VBUS. The ISP1161A has built-in

hardware functions to monitor the downstream ports loading conditions and control

their power switching. These hardware functions are implemented by the internal

power switching control circuit and overcurrent detection circuit. H_PSW1 and

H_PSW2 are power switching control output pins (active LOW, open drain) for

downstream port 1 and 2, respectively. H_OC1 and H_OC2 are overcurrent detection

input pins for downstream ports 1 and 2, respectively.

Figure 34 shows the ISP1161A downstream port power management scheme

(‘n’ represents the downstream port numbers, n=1or2).

Using either internal or external 15 k

Ω resistors.

Fig 33. Use of 15 k

Ω pull-down resistors on downstream ports.

004aaa088

22

Ω

22

Ω

bit 12

HcHardware

Configuration

ISP1161A

USB

connector

D

−

D

+

VBUS

internal

15 k

Ω

(2

×)

external

15 k

Ω

(2

×)

47 pF

(2

×)

‘n’ represents the downstream port number (n=1or2)

Fig 34. Downstream port power management scheme.

004aaa089

1

≥

0

Reg

bit 10

PSW

OC select

OC detect

regulator

H_OCn

H_PSWn

HC CORE

C/L

ISP1161A

VCC

(

+5 V or +3.3 V)

HcHardware

Configuration

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ISP1161ABD Datasheet(PDF) 39 Page - NXP Semiconductors

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