參數(shù)資料
型號： ISP1362
廠商： NXP Semiconductors N.V.
英文描述： Single-chip Universal Serial Bus On-The-Go controller
中文描述： 單芯片通用串行總線和On - The - Go控制器
文件頁數(shù)： 47/150頁
文件大小： 647K
代理商： ISP1362
Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
—
06 January 2004
47 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
12.8.1
Using internal OC detection circuit
An application using the internal OC detection circuit and internal 15 k
pull-down
resistors is shown in
Figure 23
, where DMn denotes either OTG_DM1 or H_DM2,
while DPn denotes either OTG_DP1 or H_DP2. In this example, the HC Driver must
set both AnalogOCEnable and ConnectPullDown_DS1 (bit 10 and bit 12 of the
HcHardwareCon
fi
guration register, respectively) to logic 1.
When H_OCn detects an overcurrent status on a downstream port, H_PSWn will
output HIGH to turn off the +5 V power supply to the downstream port V
BUS
. When
there is no such detection, H_PSWn will output LOW to turn on the +5 V power
supply to the downstream port V
BUS
.
In general applications, you can use a P-channel MOSFET as the power switch for
V
BUS
. Connect the +5 V power supply to the drain pole of the P-channel MOSFET,
V
BUS
to the source pole, and H_PSWn to the gate pole. This voltage drop (
V) across
the drain and source poles can be called the overcurrent trip voltage. For the internal
overcurrent detection circuit, a voltage comparator has been designed-in, with a
nominal voltage threshold of 75 mV. Therefore, when the overcurrent trip voltage (
V)
exceeds the voltage threshold, H_PSWn will output a HIGH level to turn off the
P-channel MOSFET. If the P-channel MOSFET has R
DSon
of 150 m
, the overcurrent
threshold will be 500 mA. The selection of a P-channel MOSFET with a different
R
DSon
will result in a different overcurrent threshold.
12.8.2
Using external OC detection circuit
When V
CC
(pin 56) is connected to the +3.3 V power supply instead of the +5 V
power supply, the internal OC detection circuit cannot be used. An external
OC detection circuit must be used instead. Nevertheless, regardless of V
CC
connection, an external OC detection circuit can be used from time to time. To use an
(1) 100
μ
F for the host port or 4.7
μ
F for the OTG port.
Fig 23. Using internal OC detection circuit.
004aaa148
H_OCn
H_PSWn
VBUS
DM
DP
GND
chassis
chassis
1
2
3
4
5
6
C41(1)
DGND
PSU_5V
VDD_5V
C17
0.1
μ
F
DGND
DGND
FB2
P_channel
MOSFET
C18
0.1
μ
F
R31
10 k
drain
source
gate
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