TMP108

1.4 V to 3.6 V

GND

A2

A1

C2

B2

B1

A0

C1

V+

SDA

SCL

ALERT

GND

V+

100 kW

Two-Wire

Controller

TMP108

www.ti.com

SBOS663 – APRIL 2013

APPLICATION INFORMATION

The TMP108 is a digital temperature sensor optimal for thermal management and thermal protection

applications. The TMP108 is two-wire and SMBus Interface compatible, and is specified over a temperature

range of –40°C to +125°C.

The TMP108 temperature sensor is the chip itself; the solder bumps provide the primary thermal path as a result

of the lower thermal resistance of metal. The temperature sensor result is equivalent to the local temperature of

the printed circuit board (PCB) on which the sensor is mounted.

The TMP108 only requires pull-up resistors on SCL and SDA; although, a 0.01

μF bypass capacitor is

recommended, as shown in Figure 7. There is an internal 100 k

Ω pull-up resistor connected to supply on the

ALERT pin. If required, use an external resistor of smaller value on the ALERT pin for a stronger pull-up to V+.

The SCL and SDA 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 four different addresses on the bus, connect A0 to either V+, GND, SCL, or SDA. If

A0 is connected to SCL or SDA, make their pull-up supply equal to V+.

Figure 7. Typical Application Circuit

Copyright © 2013, Texas Instruments Incorporated

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