isp1160 NXP Semiconductors, isp1160 Datasheet - Page 32

• Manufacturer Part Number: isp1160
• Description: Isp1160 Embedded Universal Serial Bus Host Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13963
Product data
9.8 Overcurrent detection and power switching control
A downstream port provides 5 V power supply to V
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_N and
H_PSW2_N are power switching control output pins (active LOW, open-drain) for
downstream ports 1 and 2, respectively. H_OC1_N and H_OC2_N are overcurrent
detection input pins for downstream ports 1 and 2, respectively.
Figure 25
Fig 24. Use of 15 k pull-down resistors on downstream ports.
Fig 25. Downstream port power management scheme.
Using either internal or external 15 k resistors.
’n’ represents the downstream port numbers (n = 1 or 2).
shows the ISP1160 downstream port power management scheme.
Configuration
HcHardware
H_PSWn_N
( 5 V or 3.3 V)
H_OCn_N
Rev. 05 — 24 December 2004
V CC
internal
15 k
(2 )
bit 12
ISP1160
OC detect
regulator
004aaa064
D
D
22
22
ISP1160
OC select
1
0 Reg
PSW
C/L
BUS
Embedded USB Host Controller
HC CORE
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
. The ISP1160 has built-in
external
Configuration
15 k
HcHardware
(2 )
V BUS
bit 10
47 pF
(2 )
004aaa065
connector
ISP1160
USB
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