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參數(shù)資料
| 型號： | 935270538118 |
| 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)： | 26/93頁 |
| 文件大小： | 2118K |
| 代理商： | 935270538118 |
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Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 03 — 27 February 2003
32 of 89
9397 750 10765
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
9.8 Overcurrent detection and power switching control
A downstream port provides 5 V power supply to VBUS. The ISP1160 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. Let H_PSWn denote either
H_PSW1 or H_PSW2 and H_OCn denote either H_OC1 or H_OC2.
Figure 25 shows the ISP1160 downstream port power management scheme.
Using either internal or external 15 k
resistors.
Fig 24. Use of 15 k
pull-down resistors on downstream ports.
004aaa064
22
22
bit 12
HcHardware
Configuration
ISP1160
USB
connector
D
D
+
VBUS
internal
15 k
(2
×)
external
15 k
(2
×)
47 pF
(2
×)
Fig 25. Downstream port power management scheme.
004aaa065
1
≥
0
Reg
bit 10
PSW
OC select
OC detect
regulator
H_OCn
H_PSWn
HC CORE
C/L
ISP1160
VCC
(
+5 V or +3.3 V)
HcHardware
Configuration
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