EMC2103 datasheet(51/85 Pages) MICROCHIP

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RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 51

6.11

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.

Bit 5 - DIS_TO - Disables the SMBus time out function.



‘0’ (default) - The SMBus time out function is enabled.



‘1’ - The SMBus time out function is disabled allowing the device to be fully I2C compliant.

Bit 4 - DIS_AVG - Disables digital averaging of the External Diode channels.



‘0’ (default) - The External Diode channels have digital averaging enabled. The temperature data

is the average of the previous four measurements.



‘1’ - The External Diode channels have digital averaging disabled. The temperature data is the last

measured data.

Bits 3-2 - QUEUE[1:0] - Determines the number of consecutive out of limit conditions that are

necessary to trigger an interrupt. Each measurement channel has a separate fault queue associated

with the high limit, low limit, and diode fault condition.

APPLICATION NOTE: If the fault queue for any channel is currently active (i.e. an out of limit condition has been

detected and caused the fault queue to increment) then changing the settings will not take

effect until the fault queue is zeroed. This occurs by the ALERT pin asserting or the out of

limit condition being removed.

Bit 1 - 0 - CONV[1:0] - determines the conversion rate of the temperature monitoring. This conversion

rate does not affect the fan driver. The supply current from VDD_3V is nominally dependent upon the

conversion rate and the average current will increase as the conversion rate increases.

Table 6.16 Configuration 2 Register

ADDR

R/W

DEFAULT

21h

R/W

Config 2

DIS_D

DIS_

AVG

QUEUE[1:0]

CONV[1:0]

0Eh

Table 6.17 Fault Queue

QUEUE[1:0]

NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS

1 (disabled)

4 (default)

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