EMC2106 EVB User Manual
Revision 1.1 (08-22-07)
SMSC EMC2106
2
1 Overview
The EMC2106 is an SMBus compliant fan controller with up to five (up to 4 external and 1 internal)
temperature channels including hardware set thermal / critical shutdown circuitry. 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.
The EMC2106 also includes a hardware programmable temperature limit and dedicated system
shutdown output for thermal protection of critical circuitry.
A block diagram of this EVB is shown in
below.
Figure 1.1 EMC2106 EVB Block Diagram
EMC2106
28 QFN
C8051F320
USB to SMBus Bridge
Temperature
Monitoring
Circuits
USB
Connector
SMBus
Connector
SMBus
FAN
32.768kHz
Oscillator
ALERT#
HW Thermal
Shutdown
Config