isp1504c NXP Semiconductors, isp1504c Datasheet - Page 8

• Manufacturer Part Number: isp1504c
• Description: Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1504A_ISP1504C_1
Product data sheet
7.4 Voltage regulator
7.5 Crystal oscillator and PLL
7.6 OTG module
For details on controlling resistor settings, see
The ISP1504 contains a built-in voltage regulator that conditions the V
inside the ISP1504. The voltage regulator:
Remark: The REG1V8 and REG3V3 pins require external decoupling capacitors. For
details, see
The ISP1504 has a built-in crystal oscillator and a Phase-Locked Loop (PLL) for clock
generation.
The crystal oscillator takes a sine-wave input from an external crystal, on the XTAL1 pin,
and converts it to a square wave clock for internal use. Alternatively, a square wave clock
of the same frequency can also be directly driven into the XTAL1 pin. Using an existing
square wave clock can save the cost of a crystal and also reduce the board size.
The PLL takes the square wave clock from the crystal oscillator and multiplies or divides it
into various frequencies for internal use. The PLL can also take a 60 MHz input from the
CLOCK pin. This eliminates the need for an external crystal or clock on XTAL1.
The PLL produces the following frequencies, irrespective of the clock source:
This module contains several sub-blocks that provide all the functionality required by the
USB OTG specification. Specifically, it provides the following circuits:
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Differential receiver and single-ended receivers to receive data at high-speed,
full-speed and low-speed
Squelch circuit to detect high-speed bus activity
High-speed disconnect detector
45
1.5 k pull-up resistor on DP for full-speed peripheral mode
15 k bus terminations on DP and DM for host and OTG modes
Supports input supply range of 3.0 V < V
Supplies internal circuitry with 1.8 V and 3.3 V
60 MHz clock for the ULPI interface controller
1.5 MHz for the low-speed USB data
12 MHz for the full-speed USB data
480 MHz for the high-speed USB data
Other internal frequencies for data conversion and data recovery
The ID detector to sense the ID pin of the mini-USB cable. The ID pin dictates which
device is initially configured as the host and which as the peripheral.
high-speed bus terminations on DP and DM for peripheral and host modes
Section
16.
Rev. 01 — 19 October 2006
CC
ISP1504A; ISP1504C
Table
< 3.6 V
8.
ULPI HS USB OTG transceiver
CC
© NXP B.V. 2006. All rights reserved.
supply for use
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