Time (s)

-1

1

3

5

7

9

11

13

15

17

19

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

Device

SCL

SDA

GND

V+

ALERT

ADD0

C

(F)

10 nF

≥

R

(F)

5 k

≤

Supply Voltage

TMP102-Q1

www.ti.com

SBOS702C – OCTOBER 2014 – REVISED DECEMBER 2015

Typical Application (continued)

8.2.2 Detailed Design Procedure

Place the TMP102-Q1 device in close proximity to the heat source that must be monitored, with a proper layout

for good thermal coupling. This placement ensures that temperature changes are captured within the shortest

possible time interval. To maintain accuracy in applications that require air or surface temperature measurement,

care must be taken to isolate the package and leads from ambient air temperature. A thermally-conductive

adhesive is helpful in achieving accurate surface temperature measurement.

The TMP102-Q1 device is a very low-power device and generates very low noise on the supply bus. Applying an

RC filter to the V+ pin of the TMP102-Q1 device can further reduce any noise that the TMP102-Q1 device might

Figure 16. Noise Reduction Techniques

8.2.3 Application Curve

Figure 17 shows the step response of the TMP102-Q1 device to a submersion in an oil bath of 100ºC from room

temperature (27ºC). The time-constant, or the time for the output to reach 63% of the input step, is 0.8 s. The

time-constant result depends on the printed circuit board (PCB) that the TMP102-Q1 device is mounted. For this

test, the TMP102-Q1 device was soldered to a two-layer PCB that measured 0.375 in × 0.437 in.

Figure 17. Temperature Step Response

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