EMC2113 datasheet(27/88 Pages) MICROCHIP

27 / 88 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS20005251A-page 27

6.3

PWM Fan Driver

The EMC2113 supports a high or low frequency PWM driver. The output can be configured as either

push-pull or open drain and the frequency ranges from 9.5Hz to 26kHz in four programmable

frequency bands.

The PWM frequency range is coarsely adjusted via the PWM Base Frequency register (Section 7.19)

with a fine tune adjustment performed via the PWM Divider registers (see Section 7.23). General PWM

operation is governed by the PWM Configuration register (see Section 7.18).

6.4

Fan Control Look-Up Table

The EMC2113 uses a look-up table to apply a user-programmable fan control profile based on

measured temperature to the fan driver. In this look-up table, each temperature channel is allowed to

control the fan drive output independently (or jointly) by programming up to eight pairs of temperature

and drive setting entries.

The Look Up Table supports external data pushed into the device by the Host in either DTS or standard

format. Each of the four temperature channels used by the Look Up table is generated from measured

temperature sensors on the EMC2113 or from an external source.

Table 6.3 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)

LEVEL

(Spin Up Configuration)

LEVEL

(Spin Up Configuration)

LEVEL

(Spin Up Configuration)

LEVEL

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

SPINUP_TIME[1:0]

(Spin Up Configuration)

Fan Max Step

Fan Minimum Drive

Valid TACH Count

TACH Target (read /

write)

TACH Target (read only)

TACH Reading

Look Up Table Drive /

Temperature Settings (read

only)

Look up Table Drive /

Temperature Settings

(read only)

DRIVE_FAIL_CNT [1:0]

(Spin Up Configuration) +

Fan Drive Fail Band

DRIVE_FAIL_CNT [1:0]

(Spin Up Configuration)

+ Fan Drive Fail Band

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