EMC2104 datasheet(26/101 Pages) SMSC

26 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

The TACH / DRIVE bit in the Look Up Table Configuration Register MUST be set to ‘0’ or

the TACH Target values will be incorrectly set. Setting this bit to ‘0’ ensures that the settings

will be RPM settings (Tachometer counts).

APPLICATION NOTE:

It is important that the TACH Target settings are in the proper format when using the RPM

based Fan Speed Control Algorithm.

5.3

PWM Fan Driver

The EMC2104 supports two PWM output drivers. These output drivers can be configured

independently to operate as an open-drain (default) or push-pull driver and can be configured with

normal or inverse polarity. Additionally, the each PWM driver frequency is programmable with ranges

from 9.5Hz to 26kHz in four programmable frequency bands.

5.4

Fan Control Look-Up Table

The EMC2104 uses a look-up table to apply a user-programmable fan control profile based on

measured temperature to each fan driver. In this look-up table, each temperature channel is allowed

Table 5.3 Fan Controls Active for Operating Mode

DIRECT SETTING

MODE

FSC MODE

DIRECT SETTING W/ LUT

MODE

FSC W/ LUT MODE

Fan Driver Setting

(read / write)

Fan Driver Setting (read

only)

Fan Driver Setting (read

only)

Fan Driver Setting (read

only)

EDGES[1:0]

(Fan Configuration)

EDGES[1:0]

RANGE[1:0]

(Fan Configuration)

RANGE[1:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

LEVEL

(Spin Up

Configuration)

LEVEL

(Spin Up Configuration)

LEVEL

(Spin Up Configuration)

LEVEL

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up

Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

Fan Step

Fan Minimum Drive

Valid TACH Count

TACH Target (read / write)

TACH Target (read

only)

TACH Reading

Look Up Table Drive /

Temperature Settings (read

only)

Look up Table Drive /

Temperature Settings

(read only)

DRIVE_FAIL_CNT[1:0] and

Drive Band Fail Registers

DRIVE_FAIL_CNT[1:0]

and Drive Band Fail

Registers

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