EMC2301 Standard Microsystems Corp., EMC2301 Datasheet - Page 7

• Manufacturer Part Number: EMC2301
• Description: Rpm-based Pwm Fan Controller
• Manufacturer: Standard Microsystems Corp.

RPM-Based PWM Fan Controller
Datasheet
Chapter 1 Pin Description
APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the voltage difference between VDD and
SMSC EMC2301
PIN NUMBER
1
2
3
4
5
6
7
8
The pin types are described in detail below. All pins labeled with (5V) are 5V tolerant.
SMDATA
SMCLK
the 5V tolerant pad must never be more than 3.6V.
GND
VDD
PIN NAME
SMDATA
ALERT#
SMCLK
Figure 1.1 EMC2301 Pin Diagram (8 pin MSOP)
TACH
PWM
GND
VDD
CLK
Table 1.1 Pin Description for EMC2301
1
2
3
4
DATASHEET
EMC2301
Open Drain PWM output driver for the Fan
Open drain tachometer input for the Fan -
Push-Pull PWM output driver for the Fan
Clock input for tachometer measurement
8-MSOP
Active low interrupt - requires external
controllers to synchronize Fan Speed
SMBus clock input - requires external
Push-Pull Clock output to other fan
SMBus data input/output - requires
7
external pull-up resistor
requires pull-up resistor
PIN FUNCTION
pull-up resistor.
pull-up resistor
Power Supply
Ground
Control
8
7
6
5
ALERT#
CLK
PWM
TACH
Revision 1.2 (03-22-10)
DIOD (5V)
PIN TYPE
OD (5V)
OD (5V)
DI (5V)
DI (5V)
DI (5V)
Power
Power
DO
DO