isp1507a NXP Semiconductors, isp1507a Datasheet - Page 45

• Manufacturer Part Number: isp1507a
• Description: Lpi Hi-speed Universal Serial Bus On-the-go Transceive
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1507A_ISP1507B_1
Product data sheet
9.12.1 OTG charge pump
9.12.2 OTG comparators
9.12.3 Pull-up and pull-down resistors
9.12.4 ID detection
9.12.5 V
9.13 Serial modes
A description of the charge pump is given in
configured as an A-device, it can provide the V
Control of the charge pump is described in
The ISP1507 provides comparators that conform to On-The-Go Supplement to the
USB 2.0 Specification Rev. 1.3 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 ISP1507 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 ISP1507 will send an RXCMD or interrupt to the link by
time t
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. 1.3 .
The ISP1507 supports both 6-pin serial mode and 3-pin serial mode, controlled by
bits 6PIN_FSLS_SERIAL and 3PIN_FSLS_SERIAL of the INTF_CTRL register (see
Section
Rev. 1.1, Section 3.10 .
Figure 22
respectively.
B_SESS_VLD
BUS
BUS
ID
B_SESS_END
charge and discharge resistors
. If the link does not receive any RXCMD or interrupt by t
10.1.3). For details, refer to UTMI+ Low Pin Interface (ULPI) Specification
power.
and
. Comparators are described in
Figure 23
. In this data sheet, V
BUS
UP(VBUS)
BUS
DN(VBUS)
Rev. 01 — 19 May 2008
is below V
above the session valid threshold to request the host to turn on
provide examples 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
power. The B-device can use the pull-down
Section 9.4.1
to
Section
Section
ISP1507A; ISP1507B
before starting a session.
Section
BUS
A_VBUS_VLD
and V
power by turning on the charge pump.
7.6.2. Changes in comparator values
7.6.4. When the controller is
BUS
10.1.8.
Table
B_SESS_VLD
ULPI HS USB OTG transceiver
and
pulsing SRP. A B-device is
Section
, V
8.
Section
A_SESS_VLD
ID
, then the ID value has
9.5.2.2. Control over
are combined into
10.1.4.
© NXP B.V. 2008. All rights reserved.
BUS
, V
. This is done
B_SESS_VLD
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