emc2106 Standard Microsystems Corp., emc2106 Datasheet - Page 24

• Manufacturer Part Number: emc2106
• Description: Emc2106 Dual Rpm-based Linear Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

Chapter 5 Product Description
Revision 1.74 (05-08-08)
KBC
The EMC2106 is an SMBus compliant fan controller with up to four (up to 4 external) temperature
channels. It contains two fan drivers, a High Side fan driver capable of sourcing 600mA from a 5V
supply and a linear DAC fan driver. In addition, the EMC2106 contains up to four (4) PWM outputs
(two of which can be used with the RPM based Fan Speed Control Algorithm). 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 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 EMC2106 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
Thermal
Thermal
diode
diode
3.3V
CPU
GPU
shows a system diagram of the EMC2106.
3.3V
* denotes other functions available on this pin
Figure 5.1 System Diagram of EMC2106
SMCLK
SMDATA
ALERT#
DP1*
DN1*
DP2*
DN2*
TRIP_SET*
OVERT1#*
OVERT2#*
SYS_SHDN#
ADDR_SEL
SHDN_SEL
EMC2106
1.2k
VDD
0.8V
3.3V
DATASHEET
Dual RPM-Based Linear Fan Controller with Hardware Thermal Shutdown
FAN_OUT (2)
VDD_5V (2)
DN3 / DN4*
DP3 / DN4*
OVERT3#*
GPIO3*
CLK_IN*
TACH2*
GPIO6
24
TACH1
DAC2*
GND
5V
3.3V
3.3V
32.768KHz Clock
(optional)
APD
tachometer
Circuit
Drive
tachometer
SMSC EMC2106
Datasheet