EMC2113 datasheet(70/85 Pages) SMSC

70 / 85 page

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

Datasheet

Revision 1.2 (10-08-09)

SMSC EMC2113

DATASHEET

If the RPM-based Fan Speed Control Algorithm is used, the TACH Target is updated after every

conversion. It is always set to the minimum TACH Target that is stored by the Look Up Table. The

PWM duty cycle is updated based on the RPM-based Fan Speed Control Algorithm configuration

settings.

If the RPM-based Fan Speed Control Algorithm is not used, then the output PWM duty cycle is updated

after every conversion. It is set to the maximum duty cycle that is stored by the Look Up Table.

If the measured temperature reading on all channels is less than the lowest threshold setting minus

the appropriate hysteresis setting, then the Fan driver will be set to 0% duty cycle and the fan will be

disabled.

7.36

Software Lock Register

The Software Lock Register controls the software locking of critical registers. This register is software

locked.

Bit 0 - LOCK - this bit acts on all registers that are designated SWL. When this bit is set, the locked

registers become read only and cannot be updated.

‘0’ (default) - all SWL registers can be updated normally.

‘1’ - all SWL registers cannot be updated and a hard-reset is required to unlock them.

7.37

Product Features Register

The Product Features Register indicates which pin selected functionality is enabled.

Bits 5-3 - ADDR_SEL[2:0] - Indicates the address that is decoded by the ADDR_SEL pin as shown in

Table 7.55, "ADDR_SEL[2:0] Encoding".

Table 7.53 Software Lock

ADDR

R/W

DEFAULT

EFh

R/W

Software

Lock

LOCK

00h

Table 7.54 Product Features Register

ADDR

R/W

DEFAULT

FCh

Product

Features

ADDR_SEL[2:0]

SHDN_SEL[2:0]

00h

Table 7.55 ADDR_SEL[2:0] Encoding

ADDR_SEL[2:0]

SMBUS ADDRESS

0101_100(r/w)

0101_101(r/w)

0101_110(r/w)

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