EMC2113 datasheet(60/85 Pages) SMSC

60 / 85 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

Revision 1.2 (10-08-09)

SMSC EMC2113

DATASHEET

transition of the actual fan operation as the desired fan speed changes. The Update Time is set as

shown in Table 7.35.

7.25

Fan Configuration 2 Register

The Fan Configuration 2 Register controls the tachometer measurement and advanced features of the

RPM-based Fan Speed Control Algorithm.

Bit 7 - TEMP_RR - Overrides max step controls for the FSC algorithm when any temperature exceeds

its respective high limit.

‘0’ (default) - All ramp rate control circuitry works at all times for the FSC algorithm or as determined

by the EN_RRC bit for manual mode.

‘1’ - If any measured temperature or the PWM Input Duty cycle meets or exceeds its respective

high limit, then the Fan Max Step register settings are not used and the FSC algorithm acts as if

the Max Step settings were at 3Fh. The device will continue to operate in this way until all

temperatures (and the PWM input duty cycle) have dropped below the respective high limit.

Bit 6 - EN_RRC - Enables ramp rate control when the fan driver is operated in the Direct Setting mode

or the Direct Setting with LUT mode.

‘0’ (default) - Ramp rate control is disabled. When the fan driver is operating in Direct Setting mode

or Direct Setting with LUT mode, the PWM setting will instantly transition to the next programmed

setting.

‘1’ - Ramp rate control is enabled. When the fan driver is operating in Direct Setting mode or Direct

Setting with LUT mode, the PWM setting will follow the ramp rate controls as determined by the

Fan Step and Update Time settings. The maximum PWM step is capped at the Fan Step setting

and is updated based on the Update Time as given by Table 7.35.

Table 7.35 Update Time

UPDATE[2:0]

UPDATE TIME

100ms

200ms

300ms

400ms (default)

500ms

800ms

1200ms

1600ms

Table 7.36 Fan Configuration 2 Register

ADDR

R/W

DEFAULT

43h

R/W

Fan

Configuration 2

TEMP_

EN_

RRC

GLITCH_

DER_OPT [1:0]

ERR_RNG:0]

28h

EMC2113 Datasheet(PDF) 60 Page - SMSC Corporation

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