EMC1186 datasheet(34/43 Pages) MICROCHIP

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Dual Channel 1°C Temperature Sensor with Hardware Thermal Shutdown and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1186

DATASHEET

If the temperature drops below the Therm Limit or Hardware Thermal Shutdown Limit, the counter is

reset. If the programmed number of consecutive measurements exceed the Therm Limit or Hardware

Thermal Shutdown Limit, and the appropriate channel is linked to the SYS_SHDN pin, the SYS_SHDN

pin will be asserted low.

Once the SYS_SHDN pin is asserted, the consecutive Therm counter will not reset until the

corresponding temperature drops below the appropriate limit minus the corresponding hysteresis.

The bits are decoded as shown in Table 6.13. 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 6.13. The default setting is 1

consecutive out of limit conversion.

6.12

External Diode Ideality Factor Registers 27h to 31h

These registers store the ideality factors that are applied to the external diodes. Table 6.15 defines

each setting and the corresponding ideality factor. Beta Compensation and Resistance Error Correction

automatically correct for most diode ideality errors; therefore, it is not recommended that these settings

be updated without consulting SMSC.

Table 6.13 Consecutive Alert / Therm Settings

NUMBER OF CONSECUTIVE OUT OF LIMIT

MEASUREMENTS

(default for CALRT[2:0])

(default for CTHRM[2:0])

Table 6.14 Ideality Configuration Registers

ADDR.

R/W

DEFAULT

27h

R/W

External

Diode 1

Ideality

Factor

IDEALITY1[5:0]

12h

EMC1186 Datasheet(PDF) 34 Page - Microchip Technology