OUT

50°C

60°C

T

(TRIP)

V

S

10

TMP708

SBOS585B – DECEMBER 2011 – REVISED DECEMBER 2016

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Typical Application (continued)

8.2.2 Detailed Design Procedure

Connect the HYST pin to VCC for 10°C hysteresis. For a 60°C temperature threshold, see the Set-Point Resistor

(RSET) section to compute an ideal RSET resistor value of 44.619 kΩ. Select the closest standard value resistor

available; in this case, 44.2 kΩ. Use a 10-kΩ pullup resistor from the OT pin to the VCC pin. To minimize power,

a larger-value pullup resistor can be used, but must not exceed 470 kΩ. Place a 0.1-μF bypass capacitor close to

the TMP708 device in order to reduce noise coupled from the power supply.

8.2.3 Application Curves

Figure 6 shows an example of the hysteresis feature. The HYST pin is connected to VCC, so the TMP708 device

is configured for 10°C of hysteresis. The device is configured for a 60°C trip temperature by the RSET resistor

value; therefore, the OT output asserts low when the 60°C threshold is exceeded. The OT output remains

asserted low until the sensor reaches 50°C.

Figure 6. TMP708 Hysteresis Function