isp1504a1 NXP Semiconductors, isp1504a1 Datasheet - Page 44

• Manufacturer Part Number: isp1504a1
• Description: Isp1504a1; Isp1504c1 Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1504A1_ISP1504C1_1
Product data sheet
9.12.1 OTG comparators
9.12.2 Pull-up and pull-down resistors
9.12.3 ID detection
9.12.4 V
9.13 Serial modes
The ISP1504x1 provides comparators that conform to On-The-Go Supplement to the
USB 2.0 Specification Rev. 1.2 requirements of V
and V
V
are communicated to the link by RXCMDs as described in
comparators is described in
The USB resistors on DP and DM can be used to initiate data-line pulsing SRP. The link
must set the required bus state using mode settings in
The ISP1504x1 provides an internal pull-up resistor to sense the value of the ID pin. The
pull-up resistor must first be enabled by setting the ID_PULLUP register bit to logic 1. If
the value on ID has changed, the ISP1504x1 will send an RXCMD or interrupt to the link
by time t
has not changed.
A pull-up resistor, R
allowed to charge V
the V
A pull-down resistor, R
whenever the A-device turns off the V
resistor to ensure V
For details, refer to On-The-Go Supplement to the USB 2.0 Specification Rev. 1.2 .
The ISP1504x1 supports both 6-pin serial mode and 3-pin serial mode, controlled by bits
6PIN_FSLS_SERIAL and 3PIN_FSLS_SERIAL of the Interface Control register. For
details, refer to UTMI+ Low Pin Interface (ULPI) Specification Rev. 1.1, Section 3.10 .
Figure 21
respectively.
A_SESS_VLD
BUS
BUS
B_SESS_END
charge and discharge resistors
ID
power.
and
. If the link does not receive any RXCMD or interrupt by t
. Comparators are described in
Figure 22
. In this data sheet, V
BUS
UP(VBUS)
BUS
DN(VBUS)
Rev. 01 — 6 August 2007
is below V
above the session valid threshold to request the host to turn on
provide example of 6-pin serial mode and 3-pin serial mode,
, is provided to perform V
Section 10.1.5
, is provided for a B-device to discharge V
B_SESS_END
BUS
A_SESS_VLD
ISP1504A1; ISP1504C1
power; the B-device can use the pull-down
to
Section
before starting a session.
Section
A_VBUS_VLD
and V
7.6.2. Changes in comparator values
BUS
10.1.8.
Table
B_SESS_VLD
ULPI HS USB OTG transceiver
pulsing SRP. A B-device is
Section
, V
8.
A_SESS_VLD
9.5.2.2. Control over
ID
are combined into
, then the ID value
© NXP B.V. 2007. All rights reserved.
BUS
, V
. This is done
B_SESS_VLD
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