EMC2103 datasheet(34/85 Pages) MICROCHIP

34 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 34

3. Setting the LUT_LOCK bit will disable the Watchdog Timer. The fan driver will be set based on the

Look Up Table settings.

Writing any other configuration registers will not disable the Watchdog Timer.

APPLICATION NOTE: Disabling the Watchdog will not automatically set the fan drive. This must be done manually

(or via the Look Up Table).

5.10

Fault Queue

The EMC2103 contains a programmable fault queue on all fault conditions. The fault queue defines

how many consecutive out-of-limit conditions must be reported before the corresponding status bit is

set (and the ALERT pin asserted).

5.11

Temperature Monitoring

The EMC2103 can monitor the temperature of up to three (3) externally connected diodes as well as

the internal or ambient temperature. Each channel is configured with the following features enabled or

disabled based on user settings and system requirements.

5.11.1

Dynamic Averaging

The EMC2103 supports dynamic averaging. When enabled, this feature changes the conversion time

for all channels based on the selected conversion rate. This essentially increases the averaging factor

as shown in Table 5.4. The benefits of Dynamic Averaging are improved noise rejection due to the

longer integration time as well as less random variation on the temperature measurement.

5.11.2

Resistance Error Correction

The EMC2103 includes active Resistance Error Correction to remove the effect of up to 100 ohms of

series resistance. Without this automatic feature, voltage developed across the parasitic resistance in

the remote diode path causes the temperature to read higher than the true temperature is. The error

induced by parasitic resistance is approximately +0.7°C per ohm. Sources of parasitic resistance

include bulk resistance in the remote temperature transistor junctions, series resistance in the CPU,

and resistance in the printed circuit board traces and package leads. Resistance error correction in the

EMC2103 eliminates the need to characterize and compensate for parasitic resistance in the remote

diode path.

Table 5.4 Dynamic Averaging Behavior

CONVERSION RATE

AVERAGING FACTOR (RELATIVE TO 11-BIT CONVERSI0N)

DYNAMIC AVERAGING

ENABLED

DYNAMIC AVERAGING

DISABLED

1 / sec

2 / sec

4 / sec

Continuous

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