EMC2113 datasheet(55/85 Pages) SMSC

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

Datasheet

SMSC EMC2113

Revision 1.2 (10-08-09)

DATASHEET

Bit 7 - PWM_INT_EN - Allows the PWM input to assert the ALERT pin.

‘0’ (default) - The ALERT pin will not be asserted if the PWM input duty cycle meets or exceeds

its high limit.

‘1’ - The ALERT pin will be asserted if the PWM input duty cycle meets or exceeds its high limit.

Bit 3 - EXT3_INT_EN - Allows the External Diode 3 to assert the ALERT pin.

‘0’ (default) - The ALERT pin will not be asserted for any error condition associated with External

Diode 3 channel.

‘1’ - The ALERT pin will be asserted for an error condition associated with External Diode 3

channel.

Bit 2 - EXT2_INT_EN - Allows the External Diode 2 to assert the ALERT pin.

‘0’ (default) - The ALERT pin will not be asserted for any error condition associated with External

Diode 2 channel.

‘1’ - The ALERT pin will be asserted for an error condition associated with External Diode 2

channel.

Bit 1 - EXT1_INT_EN - Allows the External Diode 1 to assert the ALERT pin.

‘0’ (default) - The ALERT pin will not be asserted for any error condition associated with External

Diode 1 channel.

‘1’ - The ALERT pin will be asserted for an error condition associated with External Diode 1

channel.

Bit 0 - INT_INT_EN - Allows the Internal Diode to assert the ALERT pin.

‘0’ (default) - The ALERT pin will not be asserted for any error condition associated with the Internal

Diode.

‘1’ - The ALERT pin will be asserted for an error condition associated with the Internal Diode.

7.17

Fan Interrupt Enable Register

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.

Table 7.24 Fan Interrupt Enable Register

ADDR

R/W

DEFAULT

29h

R/W

Fan

Interrupt

Enable

SPIN_

INT_EN

STALL_

INT_EN

00h

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