EMC2113 datasheet(56/88 Pages) MICROCHIP

56 / 88 page

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

Datasheet

DS20005251A-page 56

 2013 Microchip Technology Inc.

7.18

PWM Driver Configuration Register

The PWM Driver Configuration Register controls the output type and polarity of the PWM fan drive

output.

Bit 4 - PWM_OT - Determines the output type for the PWM pin.



‘0’ (default) - The PWM pin is configured as an open drain output.



‘1’ - The PWM pin is configured as a push-pull output.

Bit 0 - POLARITY - Determines the polarity of the PWM pin.



‘0’ (default) - the Polarity of the PWM output driver is normal. A drive setting of 00h will cause the

output to be set at 0% duty cycle and a drive setting of FFh will cause the output to be set at 100%

duty cycle.



‘1’ - The Polarity of the PWM output driver is inverted. A drive setting of 00h will cause the output

to be set at 100% duty cycle and a drive setting of FFh will cause the output to be set at 0% duty

cycle.

7.19

PWM Driver Base Frequency Register

The PWM Driver Base Frequency Register controls base frequency of the PWM driver output.

Bits 1-0 - PWM_BASE[1:0] - Determines the base frequency of the PWM output driver.

Table 7.25 PWM Driver Configuration Register

ADDR

R/W

DEFAULT

2Ah

R/W

PWM Driver

Config

---

PWM_

POLARITY

00h

Table 7.26 PWM Driver Base Frequency Register

ADDR

R/W

DEFAULT

2Bh

R/W

PWM Driver

Base

Frequency

----

PWM_BASE[1:0]

00h

Table 7.27 PWM_BASEx[1:0] it Decode

PWM_BASE[1:0]

BASE FREQUENCY

26.00kHz (default)

19.531kHz

4,882Hz

2,441Hz

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