ISP1508BET STEricsson, ISP1508BET Datasheet - Page 48

• Manufacturer Part Number: ISP1508BET
• Manufacturer: STEricsson

Specifications of ISP1508BET

• Lead Free Status / RoHS Status: Supplier Unconfirmed

NXP Semiconductors
ISP1508A_ISP1508B_2
Product data sheet
10.9.1 OTG comparators
10.9.2 Pull-up and pull-down resistors
10.9.3 ID detection
10.9.4 V
10.10 Serial modes
The ISP1508 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 the mode settings in
The ISP1508 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 ISP1508 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 ISP1508 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 22
respectively.
A_SESS_VLD
BUS
BUS
ID
B_SESS_END
charge and discharge resistors
. If the link does not receive any RXCMD or interrupt by t
power.
and
. Comparators are described in
Figure 23
. In this data sheet, V
BUS
UP(VBUS)
BUS
DN(VBUS)
Rev. 02 — 13 March 2008
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 11.5
, is provided for a B-device to discharge V
B_SESS_END
BUS
A_SESS_VLD
to
power; the B-device can use the pull-down
Section
Section
ISP1508A; ISP1508B
before starting a session.
A_VBUS_VLD
and V
8.7.2. Changes in comparator values
11.8.
BUS
B_SESS_VLD
ULPI HS USB OTG transceiver
pulsing SRP. A B-device is
Section
Table
, V
A_SESS_VLD
ID
14.
, then the ID value has
10.2.2.2. Control over
are combined into
© NXP B.V. 2008. All rights reserved.
BUS
, V
. This is done
B_SESS_VLD
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