Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 2.1 Pin Description for EMC2104
PIN NUMBER
EMC2104
PIN NAME
PIN FUNCTION
PIN TYPE
DN1 - Negative (cathode) analog input for
External Diode 1 (default)
AIO (2V)
1
2
DN1 / VIN1
VIN1 - General voltage input for use with
a thermistor
AI (2V)
AIO (2V)
AO (2V)
DP1 - Positive (anode) analog input for
External Diode 1 (default)
DP1 / VREF_T1
VREF_T1 - Reference output for use with
a thermistor and to drive VIN1
3
4
GND
VDD
Ground connection
Power Supply
Power
Power
Active low interrupt - requires external
pull-up resistor.
5
ALERT#
OD (5V)
DI (5V)
DI (5V)
CLK_IN - 32.768KHz clock input.
GPI1 - General Purpose Input
(default)
6
CLK_IN / GPIO1
GPO1 - General Purpose push/ pull
Output
DI (5V)
DI (5V)
OD (5V)
DIOD (5V)
DIOD (5V)
OD (5V)
DO
GPO1 - General Purpose open drain
Output.
Active low Critical System Shutdown
output
7
8
9
SYS_SHDN#
SMDATA
SMBus data input/output - requires
external pull-up resistor
SMBus clock input - requires external
pull-up resistor
SMCLK
PWM2 - Open Drain PWM drive output for
Fan 2 (default)
PWM2 - Push-Pull PWM drive output for
Fan 2
GPI3 - General Purpose Input
(software programmed)
10
PWM2 / GPIO3
DI (5V)
DO
GPO3 - General Purpose push-pull
Output
GPO3 - General Purpose open drain
Output
OD (5V)
SMSC EMC2104
Revision 1.74 (05-08-08)
DATAS11HEET
SMSC [ SMSC CORPORATION ]
