Application and Implementation

The TMP75 only requires pull-up resistors on SDA and ALERT, although a pull-up resistor is typically present on

the SCL as well. A 0.1-μF bypass capacitor on the supply is recommended, as shown in Figure 6. The SCL, SDA,

and ALERT lines can be pulled up to a supply that is equal to or higher than V+ through the pull-up resistors. To

configure one of eight different addresses on the bus, connect A0, A1, and A2 to either V+ or GND.

The TMP75 should be placed in close proximity to the heat source to be monitored, with a proper layout for good

thermal coupling. This ensures that temperature changes are captured within the shortest possible time interval. To

maintain accuracy in applications that require air or surface temperature measurement, take care to isolate the

package and leads from ambient air temperature. A thermally-conductive adhesive is helpful in achieving accurate

surface temperature measurement.

Figure 6. Typical Connections of the TMP75

I

2C

Master

SDA

SCL

ALERT

V+

A0

A1

1

3

5k

Ω

0.1

μF

Supply Voltage

1.4V~5.5V

8

7

5

GND

A2

2

4

6

TMP75

UMW R

www.umw-ic.com

13

UTD Semiconductor Co.,Limited

TMP75

1.8V Digital Temperature Sensor with I 2C Interface and Alarm Function

UMW R