USB4640 datasheet(20/64 Pages) SMSC

20 / 64 page

High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller

Datasheet

Revision 1.0 (06-09-09)

SMSC USB4640/USB4640i

DATASHEET

GPIO2 /

RXD

I/O6

This pin may be used either as input, edge sensitive interrupt input,

or output. Custom firmware is required to activate this function.

This signal can be configured as input to the RXD of the internal

UART. Custom firmware is required to activate this function.

GPIO10

(CRD_PWR)

I/O200

Card power drive: 3.3 V (100 mA or 200 mA)

This must be the only FET used to power devices. Failure to do this

will violate voltage specifications on device pins. If this pin is not

being used as a card power pin, this pin may be used either as input,

edge sensitive interrupt input, or output (GPIO).

Please see Section 8.4.2.3, "A4h-A5h: Smart Media Device Power

Configuration," on page 38 for more information.

nRESET

RESET input

The system uses this active low signal to reset the chip. The active

low pulse should be at least 1

μs wide.

TEST

TEST Input

Tie this pin to ground for normal operation.

DIGITAL / POWER / GROUND

CRFILT

VDD Core Regulator Filter Capacitor

This pin requires a 1.0

μF (or greater) ± 20% (ESR <0.1

Ω) capacitor

to VSS.

PLLFILT

Phase-locked Loop Regulator Filter Capacitor

This pin requires a 1.0

μF (or greater) ± 20% (ESR <0.1

Ω) capacitor

to VSS.

VDD12

1.2 V Power for HSIC pads and buffers

VDD33

3.3 V Power and Regulator Input

Please see Chapter 10, "DC Parameters," on page 55 for more

information.

Pins 16 and 48 each require an external bypass capacitor of 4.7

μF

minimum.

VSS

ePad

The ground pad is the only VSS for the device and must be tied to

ground with multiple vias.

Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

SYMBOL

48-PIN

QFN

BUFFER

TYPE

(Table 6.2)DESCRIPTION

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