Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Chapter 1 Block Diagram
TRIP_SET*
Thermal
Shutdown
Logic
DP1
DN1
DP2
External
Temp
Diodes
SMCLK
DN2
DP3 / DN4*
DN3 / DP4*
SMDATA
ALERT#
Analog
Mux
Temp Limit
Registers
11 bit Σ Δ
Anti-
parallel
diode
ADC
SMBus
Slave
Protocol
Temp Registers
Internal
Temp
Diode
Configuration
PWM1
PWM
PWM2*
Drivers
GPIO1*
GPIO2*
GPIO3*
Lookup
Table / RPM
Control
GPIOs
TACH1
TACH2*
Tachs
Reference
VREF*
CLK_IN*
* denotes multiple pin functions
Figure 1.1 EMC2104 Block Diagram
SMSC EMC2104
9
Revision 1.74 (05-08-08)
DATASHEET