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