EMC2101-R-ACZL-TR datasheet(37/56 Pages) MICROCHIP

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DS20006703A-page 37

EMC2101

Maximum resolution is achieved by setting the PWM

Frequency Register to 1Fh. With maximum resolution,

the desired PWM frequency can be achieved by

adjusting the PWM Frequency Divide Register setting

(PWM_D[7:0]) as shown in Table 5-7.

For example, if the user desires a 30 Hz PWM

frequency with maximum PWM resolution, then the

PWM_F[4:0] bits should be set at 1Fh (31d) and the

PWM_D bits should be set at C1h (193d).

5.21

Fan Control Look-Up Table

Hysteresis Register

The Fan Control Look-Up Table Hysteresis Register

determines the amount of hysteresis applied to the

temperature inputs of the fan control Fan Control

Look-Up Table. See Section 4.6.4 “Fan Control

Look-Up Table”.

TABLE 5-7:

EXAMPLES OF FAN PWM FREQUENCY WITH MAXIMUM RESOLUTION

PWM_F[4:0] = 1Fh

PWM_D[7:0]

Setting

Effective

Resolution

(%)

Effective Duty Cycle

(at 50% FAN_SETTING)

Effective Duty Cycle

(at 75% FAN_SETTING)

FAN_SETTING

to get 75%

Duty Cycle

Effective

PWM

Frequency

(Hz)

01h

1.61

51.6%

77.4%

2Eh (74.2%)

5806.5

11h

1.61

51.6%

77.4%

2Eh (74.2%)

341.6

20h

1.61

51.6%

77.4%

2Eh (74.2%)

181.5

47h

1.61

51.6%

77.4%

2Eh (74.2%)

81.8

1.61

51.6%

77.4%

2Eh (74.2%)

30.2

1.61

51.6%

77.4%

2Eh (74.2%)

30.0

FFh

1.61

51.6%

77.4%

2Eh (74.2%)

22.7

LOOK UP TABLE HYSTERESIS REGISTER (ADDRESS 4Fh)

Address

R/W

B7B6

B5B4B3

B2B1B0

Default

4Fh

R/W

Fan Control

Look-Up Table

Hysteresis

—

04h

(+4°C)

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