EMC2101-R-ACZL-TR datasheet(37/55 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

SMSC EMC2101

Revision 2.53 (03-13-07)

DATASHEET

Bit 6 - INT_MSK - Disables interrupts for the Internal Diode.

‘0’ (default) - The Internal Diode will generate an interrupt if its measured temperature exceeds the

Internal Diode high limit.

‘1’ - the Internal Diode will not generate interrupts.

Bit 4 - HIGH_MSK - Disables interrupts for the External Diode high limit.

‘0’ (default) - The External Diode will generate an interrupt if its measured temperature exceeds

the External Diode high limit.

‘1’ - the External Diode will not generate an interrupt when the high limit is exceeded.

Bit 3 - LOW_MSK - Disables interrupts for the External Diode low limit.

‘0’ (default) - The External Diode will generate an interrupt if its measured temperature drops below

the External Diode low limit.

‘1’ - the External Diode will not generate an interrupt when the temperature drops below the low

limit.

Bit 1 - TCRIT_MSK - Disables interrupts for the TCRIT Limit.

‘0’ (default) - An interrupt will be generated if the External Diode Temperature exceeds TCRIT.

‘1’ - An interrupt will not be generated if TCRIT is exceeded.

Bit 0 - TACH_MSK - Disables interrupts for the TACH Limit.

‘0’ (default) - An interrupted will be generated if the measured TACH value exceeds the TACH Limit

(indicating that the fan speed is too slow).

‘1’ - An interrupt will not be generated if the TACH limit is exceeded.

6.12

External Ideality Factor Register

This register stores the ideality factor that is automatically applied to the external diode. The Ideality

factor is a 6 bit value that allows for a bi-directional trim centered on an ideality factor of 1.008.

Table 6.13 defines each setting and the corresponding Ideality factor.

Table 6.12 External Ideality Factor Register

ADDR.

R/W

DEFAULT

17h

R/W

External

Ideality Factor

IDCF[5:0]

12h

Table 6.13 Ideality Factor Look-Up Table

SETTING

FACTOR

SETTING

FACTOR

SETTING

FACTOR

08h

0.9949

18h

1.0159

28h

1.0371

09h

0.9962

19h

1.0172

29h

1.0384

0Ah

0.9975

1Ah

1.0185

2Ah

1.0397

0Bh

0.9988

1Bh

1.0200

2Bh

1.0410

0Ch

1.0001

1Ch

1.0212

2Ch

1.0423

0Dh

1.0014

1Dh

1.0226

2Dh

1.0436

0Eh

1.0027

1Eh

1.0239

2Eh

1.0449

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