EMC2103 datasheet(26/85 Pages) MICROCHIP

26 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 26

5.2

Fan Control Modes of Operation

The EMC2103 has four modes of operation for the fan driver. Each mode uses Ramp Rate control and

the Spin Up Routine

1. PWM Setting Mode - in this mode of operation, the user directly controls the PWM duty cycle

setting. Updating the Fan Driver Setting Register (see Section 6.20) will instantly update the fan

drive.



This is the default mode. The PWM Setting Mode is enabled by clearing both the EN_ALGO

bit in the Fan Configuration Register (see Section 6.22) and the LUT_LOCK bit in the Look

Up Table Configuration Register (see Section 6.32).



Whenever the PWM Setting Mode is enabled the current drive will be changed to what was

last written into the Fan Driver Setting Register.

2. Fan Speed Control Mode (FSC) - in this mode of operation, the user determines a fan speed and

the drive setting is automatically updated to achieve this target speed.



This mode is enabled by clearing the LUT_LOCK bit in the Look Up Table (LUT)

Configuration Register and setting the EN_ALGO bit in the Fan Configuration Register.

3. Using the Look Up Table with Fan Drive Settings (PWM Setting w/ LUT Mode) - In this mode of

operation, the user programs the Look Up Table with PWM duty cycle settings and corresponding

temperature thresholds. The fan drive is set based on the measured temperatures and the

corresponding drive settings.



This mode is enabled by programming the Look Up Table then setting the LUT_LOCK bit

while the RPM / PWM bit is set to a ‘1’ (see Section 6.32)

4. Using the Look Up Table with Fan Speed Control algorithm (FSC w/ LUT Mode)- In this mode of

operation, the user programs the Look Up Table with fan speed target values and corresponding

temperature thresholds. The TACH Target Register will be set based on the measured

temperatures and the corresponding target settings. The PWM drive settings will be determined

automatically based on the RPM based Fan Speed Control Algorithm



This mode is enabled by programming the Look Up Table then setting the LUT_LOCK bit

while the RPM / PWM bit is set to ‘0’ (see Section 6.32).

1020

126

29400

1100

127

49900

1150

Open

Table 5.3 Fan Controls Active for Operating Mode

DIRECT PWM

SETTING MODE

FSC MODE

DIRECT PWM SETTING W/

LUT MODE

FSC W/ LUT MODE

Fan Driver Setting (read

/ write)

Fan Driver Setting (read

only)

Fan Driver Setting (read only)

Fan Driver Setting (read

only)

EDGES[1:0]

(Fan Configuration)

EDGES[1:0]

RANGE[1:0]

(Fan Configuration)

RANGE[1:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

UPDATE[2:0]

(Fan Configuration)

Table 5.2 TRIP_SET Resistor Setting (continued)

TTRIP (°C)

RSET (1%)

TTRIP (°C)

RSET (1%)

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