EMC2113 datasheet(57/85 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

7.20

Limit Registers

The EMC2113 contains high limits for all temperature channels. If any measurement meets or exceeds

the high limit then the appropriate status bit is set and the ALERT pin is asserted (if enabled).

Additionally, the EMC2113 contains low limits for all temperature channels. If the temperature channel

drops below the low limit, then the appropriate status bit is set and the ALERT pin is asserted (if

enabled).

All Limit Registers are Software Locked.

7.21

PWM Input Duty Cycle High Limit Register

The PWM Duty Cycle High Limit register stores a high limit on the Duty Cycle input on the PWM pin.

The data format for the register is the same as the PWM Input Duty Cycle register (see Section 7.5,

"PWM Input Duty Cycle Register") and it is compared at the sampling rate of the PWM Input duty cycle.

If the PWM Input Duty Cycle meets or exceeds this limit, then the PWM status bit is set (see Section

7.13, "Interrupt Status Register") and the ALERT pin is asserted. This is treated as a temperature limit

by the Fan Control circuitry.

Table 7.28 Limit Registers

ADDR

R/W

DEFAULT

30h

R/W

External Diode

1 High Limit

Sign

55h

(+85°C)

31h

R/W

External Diode

2 High Limit

Sign

55h

(+85°C)

32h

R/W

External Diode

3 High Limit

Sign

55h

(+85°C)

34h

R/W

Internal Diode

High Limit

Sign

55h

(+85°C)

38h

R/W

External Diode

1 Low Limit

Sign

00h

(0°C)

39h

R/W

External Diode

2 Low Limit

Sign

00h

(0°C)

3Ah

R/W

External Diode

3 Low Limit

Sign

00h

(0°C)

3Ch

R/W

Internal Diode

Low Limit

Sign

00h

(0°C)

Table 7.29 PWM Duty Cycle High Limit Register

ADDR

R/W

DEFAULT

3Dh

R/W

PWM Input

Duty Cycle

High Limit

-64

7Fh

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