ISP1506A datasheet(8/79 Pages) NXP

Part #	ISP1506A

Description	ULPI Hi-Speed Universal Serial Bus On-The-Go transceiver

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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8 / 79 page

ISP1506A_ISP1506B_1

Product data sheet

Rev. 01 — 30 May 2007

8 of 79

NXP Semiconductors

ISP1506A; ISP1506B

ULPI HS USB OTG transceiver

• Squelch circuit to detect high-speed bus activity

• High-speed disconnect detector

• 45

Ω high-speed bus terminations on DP and DM for peripheral and host modes

• 1.5 k

Ω pull-up resistor on DP for full-speed peripheral mode

• 15 k

Ω bus terminations on DP and DM for host and OTG modes

For details on controlling resistor settings, see Table 7.

7.4 Voltage regulator

The ISP1506 contains a built-in voltage regulator that conditions the VCC supply for use

inside the ISP1506. The voltage regulator:

• Supports input supply range 3.0V<VCC < 3.6 V

• Supplies internal circuitry with 1.8 V and 3.3 V

Remark: The REG1V8 and REG3V3 pins require external decoupling capacitors. For

details, see Section 16.

7.5 Crystal oscillator and PLL

The ISP1506 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 the 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 produces the following frequencies,

irrespective of the clock source:

• 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

7.6 OTG module

This module contains several sub-blocks that provide all the functionality required by the

USB OTG speciﬁcation. Speciﬁcally, it provides the following circuits:

• 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.

• VBUS comparators to determine the VBUS voltage level. This is required for the VBUS

detection, SRP and HNP.

• Resistors to temporarily charge and discharge VBUS. This is required for SRP.

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