USB2240 datasheet(16/43 Pages) MICROCHIP

16 / 43 page

USB224X

DS00001979A-page 16

 2010 - 2015 Microchip Technology Inc.

VDD18PLL

1.8 V PLL Power

+1.8 V Filtered analog power for internal PLL. This pin

must have a 1.0

μF ± 20% (ESR < 0.1 Ω) capacitor to

VSS.

MISC

LED

I/O12

LED: Can be used as an LED output.

RXD /

SDA

RXD: This signal can be used as input to the RXD of

UART in the device. Custom firmware is required to

activate this function.

I/O12

SDA: This is the data pin when used with an external

serial EEPROM.

TXD /

SCK /

MS_SKT_SEL

O12

TXD: This signal can be used as an output TXD of UART

in the device. Custom firmware is required to activate this

function.

O12

SCK: This is the clock output when used with an external

EEPROM.

MS_SKT_SEL: On the positive edge of RESET_N, this

pin is sampled to determined the Memory Stick socket

size.

1 = 8-bit

0 = 4-bit

CRD_PWR

I/O200

CRD_PWR: Card power drive of 3.3 V at either 100 mA

or 200 mA.

RESET_N

RESET Input: This active low signal is used by the

system 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.

No Connect. No trace or signal should be routed/attached

to these pins.

DIGITAL / POWER

VDD18

+1.8 V core power. This pin must have a 1.0

μF ± 20%

(ESR <0.1

Ω) capacitor to VSS.

VDD33

3.3 V Power and Regulator Input

VSS

ePad

Ground Pad/ePad: the package slug is the only VSS for

the device and must be tied to ground with an array of

3x3 vias.

TABLE 6-1:

USB224X 36-PIN QFN PIN DESCRIPTIONS (CONTINUED)

Symbol

Buffer

Type

Description

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