EMC1187 datasheet(18/47 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

When enabled, the dynamic averaging applies when a one-shot command is issued. The device will

perform the desired averaging during the one-shot operation according to the selected conversion rate.

When enabled, the dynamic averaging will affect the average supply current based on the chosen

conversion rate as shown in Table 5.1

5.3

SYS_SHDN Output

The SYS_SHDN output is asserted independently of the ALERT output and cannot be masked. If the

External Diode 1 temperature exceeds the Hardware Thermal Shutdown Limit for the programmed

number of consecutive measurements, the SYS_SHDN pin is asserted.

The Hardware Thermal Shutdown Limit is defined at power-up via the pull-up resistors on the

SYS_SHDN and ALERT pins as shown in Table 5.2. This limit cannot be modified or masked via

software.

In addition to External Diode 1 channel triggering the SYS_SHDN pin when the measured temperature

exceeds to the Hardware Thermal Shutdown Limit, each of the measurement channels can be

configured to assert the SYS_SHDN pin when they exceed the corresponding THERM Limit.

When the SYS_SHDN pin is asserted, it will not release until the External Diode 1 temperature drops

below the Hardware Thermal Shutdown Limit minus 10°C and all other measured temperatures drop

below the THERM Limit minus the THERM Hysteresis value (when linked to SYS_SHDN).

Figure 5.2 shows a block diagram of the interaction between the input channels and the SYS_SHDN

pin.

Table 5.1 Supply Current vs. Conversion Rate for EMC1187

CONVERSION RATE

AVERAGE SUPPLY CURRENT

(TYPICAL)

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

ENABLED

(DEFAULT)

DISABLED

ENABLED

(DEFAULT)

DISABLED

1 / 16 sec

230uA

220uA

16x

1 / 8 sec

275uA

220uA

16x

1 / 4 sec

350uA

220uA

16x

1 / 2 sec

405uA

220uA

16x

1 / sec

480uA

250uA

2 / sec

850uA

290uA

4 / sec (default)

890uA

370uA

8 / sec

970uA

525uA

16 / sec

990uA

690uA

0.5x

32 / sec

1030uA

1050uA

0.25x

64 / sec

1500uA

1100uA

0.125x

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