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EMC2105 数据表(PDF) 21 Page - SMSC Corporation

部件名 EMC2105
功能描述  RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
PDF  90 Pages
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制造商  SMSC [SMSC Corporation]
网页  http://www.smsc.com
标志 SMSC - SMSC Corporation

EMC2105 数据表(HTML) 21 Page - SMSC Corporation

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RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
Datasheet
SMSC EMC2105
21
Revision 1.72 (11-01-07)
DATASHEET
Chapter 5 Product Description
The EMC2105 is an SMBus compliant fan controller with up to four (up to 4 external) temperature
channels. It contains a single High Side fan driver capable of sourcing up to 600mA from a 5V supply.
The fan driver can be operated using two methods each with two modes. The methods include an
RPM based Fan Speed Control Algorithm and a direct fan 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 EMC2105 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 EMC2105.
Figure 5.1 System Diagram of EMC2105
EMC2105
DP1*
DN1*
DP2*
DN2*
CPU
Thermal
diode
Thermal
diode
GPU
3.3V
SMCLK
SMDATA
ALERT#
VDD
TACH1
tachometer
FAN_OUT (2)
3.3V
TRIP_SET*
0.8V
1.2k
3.3V
MCU or
system
controller
VDD_5V (2)
5V
* denotes other functions available on this pin
3.3V
SYS_SHDN#
SHDN_SEL
CLK_IN*
32.768kHz clock
DP3 / DN4*
DN3 / DP4*
APD
(optional)



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