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): 28/93頁
文件大?。?/td> 2118K
代理商: 935270538118
Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 03 — 27 February 2003
34 of 89
9397 750 10765
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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
HcHardwareConguration register, should be set to logic 0. By default after reset, this
bit is already set to logic 0; therefore, the HCD does not need to clear this bit.
Figure 27 shows how to use an external OC detection circuit.
Fig 26. Using internal OC detection circuit.
004aaa066
ATX
1
0
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
(2
×)
47 pF
(2
×)
22
22
ISP1160
VBUS
+5 V
P-Ch
MOSFET
bit 10
bit 12
HcHardware
Configuration
HcHardware
Configuration
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