ISP1505A datasheet(9/76 Pages) NXP

Part #	ISP1505A

Description	ULPI Hi-Speed USB host and peripheral transceiver

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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ISP1505A_ISP1505C_3

Product data sheet

Rev. 03 — 26 August 2008

8 of 75

NXP Semiconductors

ISP1505A; ISP1505C

ULPI HS USB host and peripheral transceiver

• 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 ISP1505 contains a built-in voltage regulator that conditions the VCC supply for use

inside the ISP1505. The voltage regulator:

• Supports input supply range of 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 ISP1505 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 VBUS comparators

The ISP1505 provides three comparators, VBUS valid comparator, session valid

comparator and session end comparator, to detect the VBUS voltage level.

7.6.1 VBUS valid comparator

This comparator is used by hosts and A-devices to determine whether the voltage on

VBUS is at a valid level for operation. The ISP1505 minimum threshold for the VBUS valid

comparator is VA_VBUS_VLD. Any voltage on VBUS below VA_VBUS_VLD is considered a fault.

During power-up, it is expected that the comparator output will be ignored.

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