EMC2303-1-KZ-TR SMSC, EMC2303-1-KZ-TR Datasheet - Page 44

• Manufacturer Part Number: EMC2303-1-KZ-TR
• Description: Industrial Temperature Sensors RPM B Fan Controller w/HW Thermal Shutdwn
• Manufacturer: SMSC

Specifications of EMC2303-1-KZ-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Revision 0.32 (06-23-08)
7.1.5
Note: The Interrupt Enable 2 (Fan Tachs) register at offset 80h defaults to enabled for the individual
See
Linking Fan Tachometers to PWMs
The TACH/PWM Association Register at offset 81h is used to associate a Tachometer input with a
PWM output. This association has three purposes:
1. The auto fan control logic supports a feature called SpinUp Reduction. If SpinUp Reduction is
2. To measure the tachometer input in Mode 2, the tachometer logic must know when the associated
3. Inhibit fan tachometer interrupts when the associated PWM is ‘OFF’.
See the description of the PWM_TACH register. The default configuration is:
PWM1 -> TACH1.
PWM2 -> TACH2.
PWM3 -> TACH3 & TACH4.
enabled (SUREN bit), the auto fan control logic will stop driving the PWM output high if the
associated TACH input is operating within normal parameters. (Note: SUREN bit is located in the
Configuration Register at offset 7Fh)
PWM is ‘ON’.
Figure 6.1 Interrupt Control on page
tachometer status events bits. The group Fan Tach INT# bit defaults to disabled. This bit needs
to be set if Fan Tach interrupts are to be generated on the external INT# pin.
DATASHEET
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Fan Control Device with High Frequency PWM and Temperature Monitors
SMSC EMC2300
Datasheet