TMP468 datasheet(33/49 Pages) TI2

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68 A

P u

TMP468

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SBOS762B – NOVEMBER 2016 – REVISED JUNE 2017

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Typical Application (continued)

(7)

(8)

The temperature measurement accuracy of the TMP468 device depends on the remote and local temperature

sensor being at the same temperature as the monitored system point. If the temperature sensor is not in good

thermal contact with the part of the monitored system, then there is a delay between the sensor response and

the system changing temperature. This delay is usually not a concern for remote temperature-sensing

applications that use a substrate transistor (or a small, SOT-23 transistor) placed close to the monitored device.

8.2.3 Application Curve

Figure 24 and Figure 25 show the typical step response to submerging a TMP468 device (initially at 25°C) in an

oil bath with a temperature of 100°C and logging the local temperature readings.

Figure 24. TMP468DSBGA Temperature Step

Response of Local Sensor

Figure 25. TMP468VQFN Temperature Step

Response of Local Sensor

9 Power Supply Recommendations

The TMP468 device operates with a power-supply range from 1.7 V to 3.6 V. The device is optimized for

operation at a 1.8-V supply, but can measure temperature accurately in the full supply range.

TI recommends a power-supply bypass capacitor. Place this capacitor as close as possible to the supply and

ground pins of the device. A typical value for this supply bypass capacitor is 0.1 μF. Applications with noisy or

high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise.

TMP468 Datasheet(PDF) 33 Page - Texas Instruments

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