isp1301 NXP Semiconductors, isp1301 Datasheet - Page 7

• Manufacturer Part Number: isp1301
• Description: Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
ISP1301_3
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 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
expected that the comparator output will be ignored.
The session valid comparator is a TTL-level input that determines when V
enough for a session to start. Both the A-device and the B-device use this comparator to
detect when a session is started. The A-device also uses this comparator to indicate when
a session is completed. The session valid threshold of the ISP1301 is between
0.8 V and 2.0 V.
The session end comparator determines when V
threshold of 0.2 V to 0.8 V.
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BUS
BUS
BUS
BUS
I
Interrupt generator
Mode Control registers
OTG registers
Interrupt related registers
Device identification registers
Output 5 V at current greater than 8 mA
Pull-up V
Pull-down V
initiating SRP
2
C-bus slave interface
comparators provide indications regarding the voltage level on V
valid comparator
charge pump
comparators
BUS
BUS
BUS
to 3.3 V through a resistor (R
to ground through a resistor (R
below this threshold is considered to be a fault. During power-up, it is
Rev. 03 — 21 February 2006
2
C-bus slave, and uses the SCL and SDA pins to
Section
BUS
10.
UP(VBUS)
line. It can operate in any of the following
BUS
DN(VBUS)
is below the B-device session end
) to initiate V
BUS
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
) to discharge V
valid comparator is 4.4 V.
USB OTG transceiver
BUS
BUS
pulsing SRP
ISP1301
.
BUS
BUS
is high
BUS
before
is at a
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