September 2003

ASM3P2185B

rev 1.0

EMI Reduction IC

2 of 7

Notice: The information in this document is subject to change without notice.

1

2

3

4

5

6

7

8

ASM3P2185B

XIN

XOUT

GND

SS%

ModOUT

VDD

NC

NC

Pin Configuration

Pin Description

Pin#

Pin Name

Type

Description

1

XIN

I

Crystal connection or external reference frequency input. This pin has dual

functions. It can be connected to either an external crystal or an external

reference clock.

2

XOUT

I

Crystal connection. Input connection for an external crystal. If using an

external reference, this pin must be left unconnected.

3

GND

P

Ground to entire chip.

4

SS%

I

Spread range select. Digital logic input used to select frequency deviation

(Refer Spread Deviation Table). This pin has an internal pull-up resistor.

5

ModOUT

O

Spread spectrum low EMI output.

6

VDD

P

Power supply for the entire chip (3.3V).

7

NC

No Connect.

8

NC

No Connect.

Spread Deviation Selection Table

SS% (pin 4)

Spread Deviation (%)

0

- 1.25

1

± 0.8%