EMC2302 datasheet(8/44 Pages) SMSC

8 / 44 page

Dual RPM-Based PWM Fan Controller

Datasheet

Revision 1.1 (10-12-09)

SMSC EMC2302

DATASHEET

The pin types are described in detail below. All pins labeled with (5V) are 5V tolerant.

APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the voltage difference between VDD and

the 5V tolerant pad must never be more than 3.6V.

9CLK

Clock input for tachometer measurement

DI (5V)

Push Pull Clock output to other fan

controllers to synchronize Fan Speed

Control

ALERT#

Active low interrupt - requires external

pull-up resistor.

OD (5V)

Table 1.2 Pin Types

PIN TYPE

DESCRIPTION

Power

This pin is used to supply power or ground to the device.

Digital Input - this pin is used as a digital input. This pin is

5V tolerant.

Push / Pull Digital Output - this pin is used as a digital

output. It can both source and sink current.

DIOD

Digital Input / Open Drain Output this pin is used as a

digital I/O. When it is used as an output, it is open drain

and requires a pull-up resistor. This pin is 5V tolerant.

Open Drain Digital Output - this pin is used as a digital

output. It is open drain and requires a pull-up resistor. This

pin is 5V tolerant.

Table 1.1 Pin Description for EMC2302 (continued)

PIN NUMBER

PIN NAME

PIN FUNCTION

PIN TYPE

EMC2302 Datasheet(PDF) 8 Page - SMSC Corporation