ISP1362EE ST-Ericsson Inc, ISP1362EE Datasheet - Page 48

• Manufacturer Part Number: ISP1362EE
• Description: IC USB CTRL SNGL CHIP 64TFBGA
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1362EE

• Controller Type: USB 2.0 Controller
• Interface: Parallel/Serial
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

NXP Semiconductors
ISP1362_5
Product data sheet
11.8.2 Using external overcurrent detection circuit
In general applications, you can use a P-channel MOSFET as the power switch for V
Connect the 5 V power supply to the source pole of the P-channel MOSFET, V
drain 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
selection of a P-channel MOSFET with a different R
overcurrent threshold.
When V
supply, the internal overcurrent detection circuit cannot be used. An external overcurrent
detection circuit must be used instead. Nevertheless, regardless of the V
external overcurrent detection circuit can be used from time to time. To use an external
overcurrent detection circuit, set AnalogOCEnable, bit 10 of register
HcHardwareConfiguration, to logic 0. By default, this bit is set to logic 0 after reset.
Therefore, the HCD does not need to clear this bit.
Figure 24
Fig 23. Using internal overcurrent detection circuit
CC
(1) 100 F for the host port, or 4.7 F for the OTG port.
shows how to use an external overcurrent detection circuit.
chassis
chassis
(pin 56) is connected to the 3.3 V power supply instead of the 5 V power
V
GND
BUS
DM
DP
1
2
3
4
5
6
DGND
DGND
Rev. 05 — 8 May 2007
DSon
C41 (1)
of 150 m , the overcurrent threshold will be 500 mA. The
DGND
C17
0.1 F
P_channel
MOSFET
FB2
DSon
source
drain
Single-chip USB OTG Controller
will result in a different
gate
C18
0.1 F
© NXP B.V. 2007. All rights reserved.
CC
ISP1362
R31
10 k
connection, an
004aaa148
PSU_5V
H_PSWn
V
H_OCn
BUS
DD(5V)
47 of 152
to the
BUS
.