Dual RPM-Based PWM Fan Controller
Datasheet
Chapter 1 Pin Description
SMDATA
SMCLK
VDD
GND
PWM1
1
2
3
4
5
EMC2302
10-MSOP
10 ALERT#
9 CLK
8 TACH2
7 PWM2
6 TACH1
Figure 1.1 EMC2302 Pin Diagram (10-Pin MSOP)
Table 1.1 Pin Description for EMC2302
PIN NUMBER
1
2
3
4
5
PIN NAME
SMDATA
SMCLK
VDD
GND
PWM1
Open Drain PWM output driver for Fan 1
6
TACH1
Open drain tachometer input for Fan 1-
requires pull-up resistor
Push-Pull PWM output driver for Fan 2
7
PWM2
Open Drain PWM output driver for Fan 2
8
TACH2
Open drain tachometer input for Fan 2 -
requires pull-up resistor
OD (5V)
DI (5V)
OD (5V)
DI (5V)
DO
PIN FUNCTION
SMBus data input/output - requires
external pull-up resistor
SMBus clock input - requires external
pull-up resistor
Power Supply
Ground
Push-Pull PWM output driver for Fan 1
PIN TYPE
DIOD (5V)
DI (5V)
Power
Power
DO
SMSC EMC2302
7
Revision 1.1 (10-12-09)
DATASHEET
SMSC [ SMSC CORPORATION ]
