EMC2103 datasheet(60/85 Pages) MICROCHIP

60 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

DS0005250A-page 60

 2013 Microchip Technology Inc.

options disable the ramp rate control maximum step settings. To take advantage of the full ramp rate

control, limit derivative options to the disabled or basic derivative settings.

Bit 2 - 1 - ERR_RNG[1:0] - Control some of the advanced options that affect the error window. When

the measured fan speed is within the programmed error window around the target speed, then the fan

drive setting is not updated. The algorithm will continue to monitor the fan speed and calculate

necessary drive setting changes based on the error, however these changes are ignored.

The Fan Configuration 2 Register is Software Locked.

6.24

Gain Register

Table 6.35 Derivative Options

DER_OPT[1:0]

OPERATION

No derivative terms used

Basic derivative. The derivative of the error from

the current drive setting and the target is added

to the iterative Fan Drive setting (in addition to

proportional and integral terms)

Step derivative. The derivative of the error from

the current drive setting and the target is added

to the iterative Fan Drive setting and is not

capped by the maximum Fan Step Register

setting.

Both the basic derivative and the step derivative

are used effectively causing the derivative term to

have double the effect of the derivative term

(default).

Table 6.36 Error Range Options

ERR_RNG[1:0]

OPERATION

0 RPM (default)

50 RPM

100 RPM

200 RPM

Table 6.37 Gain Register

ADDR

R/W

DEFAULT

45h

R/W

Gain Register

GAIND[1:0]

GAINI[1:0]

GAINP[1:0]

2Ah

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