EMC1187 datasheet(34/47 Pages) MICROCHIP

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

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1187

DATASHEET

The Software Thermal Shutdown Configuration Register controls whether any of the software channels

will assert the SYS_SHDN pin. If a channel is enabled, the temperature is compared against the

corresponding Therm Limit. If the measured temperature exceeds the Therm Limit, the SYS_SHDN

pin is asserted. This functionality is in addition to the Hardware Shutdown circuitry.

Bit 2 - E2SYS - Configures the External Diode 2 channel to assert the SYS_SHDN pin based on its

Therm Limit.



‘0’ (default) - The External Diode 2 channel is not linked to the SYS_SHDN pin. If the temperature

exceeds its Therm Limit, the E2THERM status bit is set but the SYS_SHDN pin is not asserted.



‘1’ - The External Diode 2 channel is linked to the SYS_SHDN pin. If the temperature exceeds its

Therm Limit, the E2THERM status bit is set and the SYS_SHDN pin is asserted. It will remain

asserted until the temperature drops below its Therm Limit minus the Therm Hysteresis.

Bit 1 - EXT1SYS - configures the External Diode 1 channel to assert the SYS_SHDN pin based on its

Therm Limit.



‘0’ (default) - The External Diode 1 channel is not linked to the SYS_SHDN pin. If the temperature

exceeds the Therm Limit, the E1THERM status bit is set but the SYS_SHDN pin is not asserted.



‘1’ - The External Diode 1 channel is linked to the SYS_SHDN pin. If the temperature exceeds its

Therm Limit, the E1THERM status bit is set and the SYS_SHDN pin is asserted. It will remain

asserted until the temperature drops below its Therm Limit minus the Therm Hysteresis.

Bit 0 - INTSYS - Configures the Internal Diode channel to assert the SYS_SHDN pin based on its

Therm Limit.



‘0’ (default) - The Internal Diode channel is not linked to the SYS_SHDN pin. If the temperature

exceeds its Therm Limit, the ITHERM status bit is set but the SYS_SHDN pin is not asserted.



‘1’ - The Internal Diode channel is linked to the SYS_SHDN pin. If the temperature exceeds its

Therm Limit, the ITHERM status bit is set and the SYS_SHDN pin is asserted. It will remain

asserted until the temperature drops below its Therm Limit minus the Therm Hysteresis.

6.11

Hardware Thermal Shutdown Limit Register 1Eh

This read only register returns the Hardware Thermal Shutdown Limit selected by the value of the pull-

up resistors on the ALERT and SYS_SHDN pins. The data represents the hardware set temperature

in °C using the active temperature setting set by the RANGE bit in the Configuration Register. See

Table 5.3, "Temperature Data Format" for the data format.

When the External Diode 1 Temperature exceeds this limit, the SYS_SHDN pin is asserted and will

remain asserted until the External Diode 1 Temperature drops below this limit minus 10°C.

Table 6.12 Hardware Thermal Shutdown Limit Register

ADDR.

R/W

B7B6B5B4B3B2B1B0

DEFAULT

1Eh

Hardware

Thermal

Shutdown Limit

128

N/A

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