EMC1428 datasheet(39/47 Pages) SMSC

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1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

Datasheet

SMSC EMC1428

Revision 0.62 (03-05-08)

DATASHEET

These registers are used to set the Beta Compensation factor that is used for the External Diode

channels.

Bit 3 - AUTOx - Enables the Beta Compensation factor autodetection function.

‘0’ - The Beta Compensation Factor autodetection circuitry is disabled. The External Diode will

always use the Beta Compensation factor set by the BETAx[2:0] bits.

‘1’ (default) - The Beta Compensation factor autodetection circuitry is enabled. At the beginning of

every conversion, the optimal Beta Compensation factor setting will be determined and applied.

The BETAx[2:0] bits will be automatically updated to indicate the current setting.

Bit 2-0 - BETAx[2:0] - These bits always reflect the current beta configuration settings. These bits will

be updated automatically and writing to these bits will have no effect.

5.16

Hottest Temperature Registers

The Hottest Temperature Registers store the measured hottest temperature of all the selected external

diode channels (see Section 5.22). If no External diodes are selected then the High Byte Register will

read 80h. The data format is the same as the temperature channels.

Table 5.20 Beta Compensation Look Up Table

BETAX[2:0]

MINIMUM BETA

210

000

< 0.08

001

< 0.111

010

< 0.176

011

< 0.29

100

< 0.48

101

< 0.9

110

< 2.33

Disabled

Table 5.21 Hottest Temperature Registers

ADDR

R/W

DEFAULT

32h

Hottest

Temperature

High Byte

Sign

80h

33h

Hottest

Temperature

Low Byte

0.5

0.25

0.125

00h

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