EMC2104 datasheet(61/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

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

Voltage Channel 4 (TRIP_SET / VIN4).

‘1’ - The ALERT# pin will be asserted for an error condition associated with Voltage Channel 4.

Bit 4 - EXT4_INT_EN - Allows the External Diode 4 channel to assert the ALERT# pin.

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

External Diode 4.

‘1’ - The ALERT# pin will be asserted for an error condition associated with External Diode 4.

Bit 3 - EXT3_INT_EN - Allows the External Diode 3 or VIN3 channel to assert the ALERT# pin.

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

Diode 3 or VIN3 channels.

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

VIN3 channels.

Bit 2 - EXT2_INT_EN - Allows the External Diode 2 or VIN2 channel to assert the ALERT# pin.

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

Diode 2 or VIN2 channels.

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

VIN2 channels.

Bit 1 - EXT1_INT_EN - Allows the External Diode 1 or VIN1 channel to assert the ALERT# pin.

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

Diode 1 or VIN1 channels.

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

VIN1 channels.

Bit 0 - INT_INT_EN - Allows the Internal Diode channel 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.

6.16

Fan Interrupt Enable Register

The Fan Interrupt Enable controls the masking for each Fan channel. When a channel is enabled, it

will cause the ALERT# pin to be asserted when an error condition is detected.

Bit 3 - SPIN_INT_EN2 - Allows the FAN_SPIN 2 bit to assert the ALERT# pin.

‘0’ (default) - the FAN_SPIN 2 bit will not assert the ALERT# pin though will still update the Status

‘1’ - the FAN_SPIN2 bit will assert the ALERT# pin.

Bit 2 - STALL_INT_EN2 - Allows the FAN_STALL2 bit or DRIVE_FAIL2 bit to assert the ALERT# pin.

‘0’ (default) - the FAN_STALL2 bit or DRIVE_FAIL2 bit will not assert the ALERT# pin though it will

still update the Status Register normally.

Table 6.21 Fan Interrupt Enable Register

ADDR

R/W

B7B6B5B4

B1B0

DEFAULT

29h

R/W

Fan

Interrupt

Enable

----

SPIN_

INT_EN2

STALL_

INT_EN2

SPIN_

INT_EN

STALL_

INT_EN

00h

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