EMC2103 datasheet(57/85 Pages) MICROCHIP

57 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 57

6.20

Fan Setting Registers

The Fan Setting Register always displays the current setting of the Fan Driver. Reading from the

Therefore it is possible that reading from this register will not report data that was previously written

into this register.

While the RPM based Fan Speed Control Algorithm or the Look Up Table are active (or both), then

the register is read only. Writing to the register will have no affect and the data will not be stored.

If both the RPM based Fan Control Algorithm and the Look Up Table are disabled, then the register

will be set with the previous value that was used. The register is read / write and writing to this register

will affect the fan speed.

The contents of the register represent the weighting of each bit in determining the final duty cycle. The

output drive for a PWM output is given by Equation [1].

6.21

PWM Divide Register

The PWM Divide Register determines the final frequency of the PWM driver. The driver base frequency

is divided by the value of the PWM Divide Register to determine the final frequency. The duty cycle

settings are not affected by these settings, only the final frequency of the PWM driver. A value of 00h

will be decoded as 01h.

The final PWM frequency is derived as the base frequency divided by the value of this register as

shown in Equation [2].

6.22

Fan Configuration 1 Register

Table 6.28 Fan Driver Setting Register

ADDR

R/W

DEFAULT

40h

R/W

Fan Setting

128

00h

[1]

Table 6.29 PWM Divide Register

ADDR

R/W

DEFAULT

41h

R/W

PWM Divide

128

01h

[2]

Table 6.30 Fan Configuration 1 Register

ADDR

R/W

DEFAULT

42h

R/W

Fan

Configuration 1

EN_

ALGO

RANGE[1:0]

EDGES[1:0]

UPDATE[2:0]

2Bh

Drive

VALUE

255

---------------------





100%



PWM

PWM base freqeuncy

PWM Divide Setting

----------------------------------------------------------------

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