EMC1422 datasheet(21/36 Pages) SMSC

Part #	EMC1422

Description	1C Temperature Sensor with Hardware Thermal Shutdown

PDF	36 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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1°C Temperature Sensor with Hardware Thermal Shutdown

Datasheet

SMSC EMC1422

Revision 1.16 (03-15-07)

DATASHEET

5.10

Temperature Monitors

In general, thermal diode temperature measurements are based on the change in forward bias voltage

of a diode when operated at two different currents. This

ΔV

BE is proportional to absolute temperature

as shown in the following equation:

Figure 5.6 shows a block diagram of the temperature measurement circuit. The negative terminal for

the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to

ground.

Figure 5.5 Temperature Filter Impulse Response

where:

k = Boltzmann’s constant

T = absolute temperature in Kelvin

[1]

q = electron charge

η = diode ideality factor

Filter Impulse Response

468

Samples

Disabled

Level1

Level2

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

LOW

HIGH

EMC1422 Datasheet(PDF) 21 Page - SMSC Corporation