EMC2103 datasheet(59/85 Pages) MICROCHIP

59 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 59

Bit 2-0 - UPDATE - determines the base time between fan driver updates. The Update Time, along

with the Fan Step Register, is used to control the ramp rate of the drive response to provide a cleaner

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

shown in Table 6.33.

6.23

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 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 6.33.

Bit 5 - GLITCH_EN - Disables the low pass glitch filter that removes high frequency noise injected on

the TACH pin.



‘0’ - The glitch filter is disabled.



‘1’ (default) - The glitch filter is enabled.

Bits 4 - 3 - DER_OPT[1:0] - Control some of the advanced options that affect the derivative portion of

the RPM based Fan Speed Control Algorithm as shown in Table 6.35. Note that the default derivative

Table 6.33 Update Time

UPDATE[2:0]

UPDATE TIME

100ms

200ms

300ms

400ms (default)

500ms

800ms

1200ms

1600ms

Table 6.34 Fan Configuration 2 Register

ADDR

R/W

DEFAULT

43h

R/W

Fan

Configuration

EN_

RRC

GLITCH

_EN

DER_OPT [1:0]

ERR_RNG:0]

38h

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