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EMC2104 Fiches technique(PDF) 21 Page - SMSC Corporation

No de pièce EMC2104
Description  Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
PDF  101 Pages
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Fabricant  SMSC [SMSC Corporation]
Site Internet  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC2104 Fiches technique(HTML) 21 Page - SMSC Corporation

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
SMSC EMC2104
21
Revision 1.74 (05-08-08)
DATASHEET
Chapter 5 Product Description
The EMC2104 is an SMBus compliant fan controller with up to five (up to 4 external and 1 internal)
temperature channels. It contains two fan drivers, both PWM outputs with programmable frequencies.
The fan drivers can be operated using two methods each with two modes. The methods include an
RPM based Fan Speed Control Algorithm and a direct PWM drive setting. The modes include manually
programming the desired settings or using the internal programmable temperature look-up table to
select the desired setting based on measured temperature.
The temperature monitors offer 1°C accuracy (for external diodes) with sophisticated features to
reduce errors introduced by series resistance and beta variation of substrate thermal diode transistors
commonly found in processors (including support for BJT or transistor model for CPU diodes).
The EMC2104 also includes a hardware programmable temperature limit and dedicated system
shutdown output for thermal protection of critical circuitry. Any of the three temperature channels can
be configured to measure a thermistor or voltage channel using a precision reference voltage for
reduced system complexity.
Figure 5.1 shows a system diagram of the EMC2104.
Figure 5.1 System Diagram of EMC2104
EMC2104
DP1*
DN1*
DP2*
DN2*
CPU
Thermal
diode
Thermal
diode
GPU
3.3V
TRIP_SET*
SMCLK
SMDATA
ALERT#
VDD
TACH1
tachometer
PWM1
3.3V
Drive
Circuit
0.8V
1.2k
3.3V
KBC
3.3V
SYS_SHDN#
SHDN_SEL
TACH2*
tachometer
3.3V
Drive
Circuit
32.768KHz Clock
CLK_IN*
PWM2*
DP3 / DN4*
DN3 / DP4*
APD
(optional)



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