EMC2101-R-ACZL-TR datasheet(37/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

SMSC EMC2101

Revision 2.54 (06-16-09)

DATASHEET

The External Diode Force Register is used to force the Fan Control Look-Up Table to a specific fan-

speed setting. When this function is enabled (see Section 6.16), the contents of this register are

compared against the temperature thresholds in the Fan Control Look-Up Table to determine the fan

setting to use.

The contents of this register represent temperature data in the same format as the data registers and

can be updated at any time.

The External Diode Temperature Registers are updated normally with the measured temperature and

compared against the THIGH and TCRIT limits normally but not used to determine the fan speed.

APPLICATION NOTE: This mode is used if the host or system requires temperature data from a source other than

the EMC2101 External Diode to be used for fan control.

6.9

One Shot Register

The One Shot Register initiates an update of the temperature measurements. This register can be

written at any time, however will only perform a one-shot conversion when the temperature monitoring

is in standby mode. When the one shot temperature conversion is complete the temperature data

registers are updated and the fan setting is updated if necessary. This register is self-clearing.

6.10

Scratchpad Registers

The Scratchpad Registers are R/W registers that perform no function. They are included for software

compatibility.

6.11

Alert Mask Register

The Alert Mask Register enables interrupts from the temperature monitors and limits. Regardless of

the condition of the individual mask bits, the Status Register will be updated normally.

Table 6.9 One Shot Register

ADDR.

R/W

DEFAULT

0Fh

One Shot

Writing to this register initiates a one shot update of the

temperature data. Data is not relevant and is not stored.

00h

Table 6.10 Scratchpad Registers

ADDR.

R/W

DEFAULT

11h

R/W

Scratchpad

00h

12h

R/W

Scratchpad

00h

Table 6.11 Alert Mask Register

ADDR.

R/W

DEFAULT

16h

R/W

Alert Mask

INT_

MSK

HIGH

MSK

LOW_

MSK

TCRIT_

MSK

TACH_

MSK

A4h

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