ISP1507B datasheet(11/81 Pages) ETC2

Part #	ISP1507B

Description	ULPI Hi-Speed USB On-The-Go transceiver

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CD00222689

Product data sheet

Rev. 04 — 20 May 2010

11 of 81

ISP1507A; ISP1507B

ULPI HS USB OTG transceiver

7.6.4 Charge pump

The ISP1507 uses a built-in charge pump to supply current to VBUS at a nominal voltage

of 5 V. The charge pump works as a capacitive DC-DC converter. An external holding

capacitor, Ccp(C_A)-(C_B), is required between the C_A and C_B pins as shown in Figure 3,

which also shows a typical OTG VBUS load. The value of Ccp(C_A)-(C_B) depends on the

amount of current drive required. If the internal charge pump is not used, the Ccp(C_A)-(C_B)

capacitor is not required.

For details on the C_A and C_B pins, see Section 7.9.8.

7.7 Band gap reference voltage

The band gap circuit provides a stable internal voltage reference to bias the analog

circuitry. The band gap requires an accurate external reference, RRREF, resistor

connected between the RREF pin and GND. For details, see Section 16.

7.8 Power-On Reset (POR)

The ISP1507 has an internal power-on reset circuit that resets all internal logic on

power-up. The ULPI interface is also reset on power-up.

Remark: When CLOCK starts toggling after power-up, the USB link must issue a reset

command over the ULPI bus to ensure correct operation of the ISP1507.

7.9 Detailed description of pins

7.9.1 DATA[7:0]

The ISP1507 is a Physical layer (PHY) containing a USB transceiver. DATA[7:0] is the

bidirectional data bus. The USB link must drive DATA[7:0] to LOW when the ULPI bus is

idle. When the link has data to transmit to the PHY, it drives a nonzero value.

The data bus can be reconfigured to carry various data types, as given in Section 8 and

Section 9.

The DATA[7:0] pins can be 3-stated by driving pin CHIP_SELECT_N to HIGH. Weak

pull-down resistors are incorporated into the DATA[7:0] pins as part of the interface protect

feature. For details, see Section 9.3.1.

Fig 3.

External capacitors connection

004aab037

ISP1507

VBUS

C_B

C_A

Ccp(C_A)-(C_B)

OTG VBUS

4.7

μF

0.1

μF

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ISP1507B Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers

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