isp1504a NXP Semiconductors, isp1504a Datasheet - Page 30

• Manufacturer Part Number: isp1504a
• Description: Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1504A_ISP1504C_3
Product data sheet
9.5.2.3 Using and selecting the V
The V
link whenever there is a change in the V
must first enable the corresponding interrupts in the USB Interrupt Enable Rising Edge
and USB Interrupt Enable Falling Edge registers.
The link can use the V
shows the recommended usage for typical applications.
Table 15.
Standard USB host controllers:
500 mA on V
detect overcurrent conditions. If the external overcurrent detector provides a digital fault
signal, then the fault signal must be connected to the ISP1504 FAULT input pin, and the
link must do the following:
Standard USB peripheral controllers:
when V
start and end of USB peripheral operations. Detection of A_VBUS_VLD and SESS_END
thresholds is not needed for standard peripherals.
Application
Standard host
Standard peripheral no
OTG A-device
OTG B-device
1. Set the IND_COMPL bit in the Interface Control register to logic 0 or logic 1,
2. Set the USE_EXT_VBUS_IND bit in the OTG Control register to logic 1.
3. If it is not necessary to qualify the fault indicator with the internal A_VBUS_VLD
Fig 11. RXCMD A_VBUS_VLD indicator source
USE_EXT_VBUS_IND,
depending on the polarity of the external fault signal.
comparator, set the IND_PASSTHRU bit in the Interface Control register to logic 1.
BUS
IND_PASSTHRU
BUS
IND_COMPL
state encoding is shown in
V
is at a sufficient level for operation. SESS_VLD must be enabled to detect the
BUS
BUS
FAULT
V
indicators in RXCMD required for typical applications
BUS
in the range of 4.75 V to 5.25 V. An external circuit must be used to
A_VBUS_VLD comparator
A_VBUS_VLD
yes
yes
no
FAULT indicator
BUS
Rev. 03 — 7 April 2008
state to monitor V
BUS
state encoding
For standard hosts, the system must be able to provide
internal A_VBUS_VLD
Table
BUS
Standard peripherals must be able to detect
SESS_VLD
no
yes
yes
yes
11. The ISP1504 will send an RXCMD to the
state. To receive V
BUS
ISP1504A; ISP1504C
complement
and take appropriate action.
output
ULPI HS USB OTG transceiver
SESS_END
no
no
no
yes
BUS
state updates, the link
004aaa698
(0, X)
(1, 0)
(1, 1)
© NXP B.V. 2008. All rights reserved.
RXCMD
A_VBUS_VLD
Table 15
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