isp1302 NXP Semiconductors, isp1302 Datasheet - Page 8

• Manufacturer Part Number: isp1302
• Description: Isp1302 Universal Serial Bus On-the-go Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
ISP1302_1
Product data sheet
7.3.1 V
7.3.2 Session valid comparator
7.3.3 Session end comparator
7.1 Serial controller
7.2 V
7.3 V
The serial controller includes the following functions:
The serial controller acts as an I
communicate with the OTG Controller.
For details on the serial controller, see
The charge pump supplies current to the V
modes:
V
This comparator is used by an A-device to determine whether the voltage on V
valid level for operation. The minimum threshold for the V
Any voltage on V
timer (t
when the internal charge pump is turned on (bit VBUS_DRV = 1) and is disabled when the
internal charge pump is turned off (bit VBUS_DRV = 0). During power-up, it is expected
that the comparator output will be ignored.
The session valid comparator is used to determines when V
session to start. Both the A-device and the B-device use this comparator to detect when a
session is started. These devices also use this comparator to indicate when a session is
completed. The session valid threshold is between 0.8 V to 2.0 V for A-device, and
between 0.8 V to 4.0 V for B-device.
The session end comparator determines when V
threshold of 0.2 V to 0.8 V.
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BUS
BUS
BUS
BUS
Serial controller interface
Device identification registers
Control registers
Interrupt registers
Interrupt generator
Output 5 V at current above 50 mA
Pull-up V
Pull-down V
comparators provide indications regarding the voltage level on V
valid comparator
charge pump
comparators
d(VA_VBUS_VLD)
BUS
BUS
BUS
to 3.3 V through a resistor (R
to ground through a resistor (R
) is implemented for the V
below this threshold is considered a fault. A hardware debounce
Rev. 01 — 24 May 2007
2
C-bus slave, and uses the SCL and SDA pins to
Section
BUS
USB OTG transceiver with carkit support
UP(VBUS)
BUS
line. It can operate in any of the following
9.
BUS
valid comparator. This timer is enabled
DN(VBUS)
is below the B-device session end
) to initiate V
BUS
) to discharge V
BUS
valid comparator is 4.4 V.
is high enough for a
BUS
BUS
© NXP B.V. 2007. All rights reserved.
pulsing SRP
ISP1302
.
BUS
BUS
is at a
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