EMC2104 datasheet(56/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

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

normally.

Bit 3 - SYS3 - Enables the high temperature limit for the External Diode 3 channel to trigger the Critical

/ Thermal Shutdown circuitry (see Section 6.1).

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).

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).

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 3 channel can be

configured for any type of diode

‘1’ - The Anti-parallel diode functionality is enabled. Both the External Diode 3 and 4 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 4 channel will be

implemented. This includes the SYS4 bit operation, limit comparisons, and look up table

comparisons.

6.10

Configuration 2 Register

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

fault queue. This register is software locked.

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 for the SMBus client (if enabled).

‘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 1 channel.

‘0’ (default) - The External Diode 1 channel has digital averaging enabled. The temperature data

is the average of the previous four measurements.

‘1’ - The External Diode 1 channel has 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 except the internal diode.

Table 6.13 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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