EMC2113 datasheet(51/88 Pages) MICROCHIP

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RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 51



‘1’ - the External Diode 3 channel high limit will be linked to the SYS_SHDN pin. If the temperature

meets or exceeds the limit then the SYS_SHDN pin will be asserted. The SYS_SHDN pin will be

released when the temperature drops below the high limit. The ALERT pin will be asserted

normally.

Bit 2 - SYS2 - Enables the high temperature limit for the External Diode 2 channel to trigger the

Critical/Thermal Shutdown circuitry (see Section 6.1).



‘0’ (default) - the External Diode 2 channel high limit will not be linked to the SYS_SHDN pin. If the

temperature meets or exceeds the limit, the ALERT pin will be asserted normally.



‘1’ - the External Diode 2 channel high limit will be linked to the SYS_SHDN pin. If the temperature

meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be

asserted normally.

Bit 1 - SYS1 - Enables the high temperature limit for the External Diode 1 channel to trigger the

Critical/Thermal Shutdown circuitry (see Section 6.1).



‘0’ (default) - The External Diode 1 channel high limit will not be linked to the SYS_SHDN pin. If

the temperature meets or exceeds the limit, the ALERT pin will be asserted normally.



‘1’ - The External Diode 1 channel high limit will be linked to the SYS_SHDN pin. If the temperature

meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be

asserted normally.

Bit 0 - APD - This bit enables the Anti-parallel diode functionality on the External Diode 3 pins (DP3

and DN3).



‘0’ (default) - The Anti-parallel diode functionality is disabled. The External Diode 2 channel can be

configured for any type of diode



‘1’ - The Anti-parallel diode functionality is enabled. Both the External Diode 2 and 3 channels are

configured to support a diode or diode connected transistor (such as a 2N3904).

APPLICATION NOTE: When the APD diode is enabled, there will be a delay of a full temperature update before

any comparisons and functionality associated with the External Diode 3 channel will be

implemented. This includes the SYS3 bit operation, limit comparisons, and look up table

comparisons.

The Configuration Register is software locked.

7.12

Configuration 2 Register

The Configuration 2 Register controls conversion rate of the temperature monitoring as well as the

fault queue.

Bit 6 - DIS_DYN - Disables the Dynamic Averaging Feature.



‘0’ (default) - The Dynamic Averaging function is enabled. The conversion time for all temperature

channels is scaled based on the chosen conversion rate to maximize accuracy and immunity to

random temperature measurement variation.



‘1’ - The Dynamic Averaging function is disabled. The conversion time for all temperature channels

is fixed regardless of the chosen conversion rate.

Table 7.17 Configuration 2 Register

ADDR

R/W

DEFAULT

21h

R/W

Config 2

DIS_

DYN

DIS_

AVG

QUEUE[1:0]

CONV[1:0]

0Eh

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