Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Chapter 1 Block Diagram
SYS_SHDN#
SHDN_SEL
VIN1*
VIN2*
VIN3*
TRIP_SET*
DP1
DN1
DP2
DN2
DP3 / DN4*
DN3 / DP4*
Thermal
Shutdown
Logic
SMCLK
Analog
Mux
Anti-
parallel
diode
Internal
Temp
Diode
Configuration
SMDATA
11 bit
Σ Δ
ADC
Temp Limit
Registers
SMBus
Slave
Protocol
ALERT#
External
Temp
Diodes
Temp Registers
PWM1
PWM2*
PWM
Drivers
GND
VDD
Lookup
Table / RPM
Control
GPIOs
GPIO1*
GPIO2*
GPIO3*
TACH1
TACH2*
CLK_IN*
Tachs
Reference
VREF*
* denotes multiple pin functions
Figure 1.1 EMC2104 Block Diagram
SMSC EMC2104
9
Revision 1.74 (05-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
