Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 2.1 Pin Description for EMC2104 (continued)
PIN NUMBER
EMC2104
PIN NAME
PIN FUNCTION
PIN TYPE
TACH2 - Tachometer input for Fan 2
(default)
DI (5V)
DI (5V)
DO
GPI2 - General Purpose Input
11
TACH2 / GPIO2
GPO2 - General Purpose push-pull
Output
GPO2 - General Purpose open drain
Output
OD (5V)
DI (5V)
12
13
14
15
TACH1
PWM1
Tachometer input for Fan 1
PWM1 - Open Drain PWM drive output for
Fan 1
(default)
OD (5V)
PWM1 - Push-Pull PWM drive output for
Fan 1
DO
n/c
Not Internally Connected
N/A
TRIP_SET - Determines HW Shutdown
temperature features for the hardware
shutdown channel
AI (2V)
TRIP_SET / VIN4
VIN4 - General voltage input when
Thermal / Critical shutdown disabled
AI (2V)
AIO
Determines HW Shutdown temperature
features and measurement channel
16
17
SHDN_SEL
DN3 / DP4 - Negative (cathode) analog
input for External Diode 3 and positive
(anode) Analog Input for External Diode 4
(default)
AIO (2V)
AI (2V)
DN3 / DP4 / VIN3
VIN3 - General voltage input for use with
a thermistor
DP3 / DN4 - Positive (anode) analog input
for External Diode 3 and negative
(cathode) analog input for External Diode
AIO (2V)
4
18
19
DP3 / DN4 / VREF_T3
(default)
VREF_T3 - Reference output for use with
a thermistor and to drive VIN3
AO (2V)
AIO (2V)
AI (2V)
DN2 - Negative (cathode) analog input for
External Diode 2
(default)
DN2 / VIN2
VIN2 - General voltage input for use with
a thermistor
DP2 - Positive (anode) analog input for
External Diode 2
AIO (2V)
(default)
20
DP2 / VREF_T2
VREF_T2 - Reference output for use with
a thermistor and to drive VIN2
AO (2V)
Revision 1.74 (05-08-08)
SMSC EMC2104
DATA1S2HEET
SMSC [ SMSC CORPORATION ]
