13892 datasheet(110/156 Pages) FREESCALE

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Analog Integrated Circuit Device Data

110

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

CONNECTIVITY

USB INTERFACE

The MC13892 contains the regulators required to supply the PHY contained in the i.MX51, i.MX37, i.MX35, and i.MX27

processors. The regulators used to power the external PHY in the i.MX51 and i.MX37 are VUSB, VUSB2, and VUSB for the

i.MX35 and i.MX27 processors. The MC13892 also provides the 5.0 V supply for USB OTG operation. The USB interface may

be used for portable product battery charging (refer to Battery Interface and Control for more details on the charging system).

Finally included are comparators/detectors for VBUS and ID detection. The USB interface is illustrated in the following diagram.

Figure 32. USB Interface

SUPPLIES

The VUSB regulator is used to supply 3.3 V to the external USB PHY. The UVBUS line of the USB interface is supplied by the

host in the case of host mode operation, or by the integrated VBUS generation circuit, in the case of USB OTG mode operation.

The VBUS circuit is powered from the SWBST boost supply to ensure OTG current sourcing compliance through the normal

discharge range of the main battery.

The VUSB regulator can be supplied from the UVBUS wire of the cable when supplied by a host in the case of host mode

operation, or by the SWBST voltage brought in at the VINUSB pin and internally connected to the VBUS pin for OTG mode

operation. The VUSBIN SPI bit is used to make the selection between host or OTG mode operation as defined in Table 99.

13892 датащи(PDF) 110 Page - Freescale Semiconductor, Inc