EMC2104 datasheet(57/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

The Critical / Thermal Shutdown temperature has a separate fault queue that applies to the selected

hardware shutdown channel (see Section 6.1.1) when compared against the threshold set by the

TRIP_SET pin.

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.

6.11

Configuration 3 Register

The Configuration 3 Register controls the four voltage input channels. This register is software locked.

Bit 6 - VIN4_INV - Determines whether the VIN4 channel data is inverted.

‘0’ (default) - The VIN4 channel data is not inverted.

Table 6.14 Fault Queue

QUEUE[1:0]

NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS

1 (disabled)

4 (default)

Table 6.15 Conversion Rate

CONV[1:0]

CONVERSION RATE

TEMPERATURE OVER SAMPLING

FROM 11 BITS

DYN_DIS = ‘0’

DYN_DIS = ‘1’

1 / sec

2 / sec

4 / sec (default)

Continuous

Table 6.16 Configuration 3 Register

ADDR

R/W

DEFAULT

22h

R/W

Config 3

VIN4_I

VIN3

_EN

VIN3

_INV

VIN2

_EN

VIN2

_INV

VIN1

_EN

VIN1

_INV

00h

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