EMC2103 datasheet(55/85 Pages) MICROCHIP

55 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 55

The Fan Interrupt Enable Register controls the masking for errors generated by the Fan Driver. When

a channel is masked, it will not cause the ALERT pin to be asserted when an error condition is

detected.

Bit 1 - SPIN_INT_EN - Allows the FAN_SPIN bit to assert the ALERT pin.



‘0’ (default) - the FAN_SPIN bit will not assert the ALERT pin though it will still update the Status



‘1’ - the FAN_SPIN bit will assert the ALERT pin.

Bit 0 - STALL_INT_EN - Allows the FAN_STALL bit or DRIVE_FAIL bit to assert the ALERT pin.



‘0’ (default) - the FAN_STALL bit or DRIVE_FAIL bit will not assert the ALERT pin though will still

update the Status Register normally.



‘1’ - the FAN_STALL bit will assert the ALERT pin.

6.17

PWM Configuration Register

The PWM Config Register controls the output type and polarity of the PWM 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 - POLARITY1 - Determines the polarity of PWM1 (if enabled).



‘0’ (default) - the Polarity of the PWM 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 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.

6.18

PWM Base Frequency Register

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

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

Table 6.24 PWM Configuration Register

ADDR

R/W

DEFAULT

2Ah

R/W

PWM

Config

---

PWM_

POLA

RITY

00h

Table 6.25 PWM Base Frequency Register

ADDR

R/W

DEFAULT

2Bh

R/W

PWM Base

Frequency

----

PWM_BASE[1:0

]

03h

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