EMC1413 datasheet(37/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

SMSC EMC1413 / EMC1414

Revision 1.41 (02-23-12)

DATASHEET

Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the

corresponding Therm Limit before the THERM pin is asserted. All temperature channels use this value

to set the respective counters. The consecutive Therm counter is incremented whenever any

measurement exceed the corresponding Therm Limit.

If the temperature drops below the Therm Limit, the counter is reset. If a number of consecutive

measurements above the Therm Limit occurs, the THERM pin is asserted low.

Once the THERM pin has been asserted, the consecutive therm counter will not reset until the

corresponding temperature drops below the Therm Limit minus the Therm Hysteresis value.

The bits are decoded as shown in Table 7.14. The default setting is 4 consecutive out of limit

conversions.

Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of

limit condition or diode fault before the ALERT pin is asserted. All temperature channels use this value

to set the respective counters. The bits are decoded as shown in Table 7.14. The default setting is 1

consecutive out of limit conversion.

7.13

Beta Configuration Registers

These registers are used to set the Beta Compensation factor that is used for the external diode

channels.

Bit 3 - ENABLEX - Enables the Beta Compensation factor auto-detection function. The ENABLE2

control is disabled for the EMC1414; beta compensation cannot be enabled for External Diode 2 or 3.

‘0’ - The Beta Compensation Factor auto-detection circuitry is disabled.

‘1’ - The Beta Compensation factor auto-detection 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. This is the default for

Table 7.14 Consecutive Alert / Therm Settings

NUMBER OF CONSECUTIVE OUT OF LIMIT

MEASUREMENTS

(default for CALRT[2:0])

(default for CTHRM[2:0])

Table 7.15 Beta Configuration Registers

ADDR.

R/W

DEFAULT

25h

R/W

External

Diode 1 Beta

Configuration

ENABLE1

BETA1[2:0]

08h

26h

R/W

External

Diode 2 Beta

Configuration

ENABLE2

BETA2[2:0]

08h for

EMC1413

and 07h

for

EMC1414

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