TMP117 datasheet(33/50 Pages) TI2

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8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The TMP117 is used to measure the temperature of the board location where the device is mounted. The

programmable address options allow up to four locations on the board to be monitored on a single serial bus.

For more information, refer to the related Considerations for Measuring Ambient Air Temperature (SNOA966),

Replacing resistance temperature detectors with the TMP116 temp sensor (SNOA969), and Temperature

sensors: PCB guidelines for surface mount devices (SNOA967) application reports on ti.com.

8.2 Typical Application

1.7 V to 5.5 V

VDD

GND

SDA

SCL

ADD0

ALERT

TMP117

5 k

2-wire interface I2C or

SMBus compatible

controller

Figure 8-1. Typical Connections

8.2.1 Design Requirements

The TMP117 operates only as a slave device and communicates with the host through the I2C-compatible serial

interface. SCL is the input pin, SDA is a bidirectional pin, and ALERT is the output. The TMP117 requires a

pullup resistor on the SDA, and ALERT pins. The recommended value for the pullup resistors is 5 kΩ. In some

applications, the pullup resistor can be lower or higher than 5 kΩ. A 0.1-µF bypass capacitor is recommended

to be connected between V+ and GND. An SCL pullup resistor is required if the system microprocessor SCL pin

is open-drain. Use a ceramic capacitor type with a temperature rating that matches the operating range of the

application, and place the capacitor as close as possible to the V+ pin of the TMP117. The ADD0 pin can be

connected directly to GND, V+, SDA and SCL for address selection of four possible unique slave ID addresses.

Table 7-1 explains the addressing scheme. The ALERT output pin can be connected to a microcontroller

interrupt that triggers an event that occurred when the temperature limit exceeds the programmable value in

registers 02h and 03h. The ALERT pin can be left floating or connected to ground when not in use.

www.ti.com

TMP117

SNOSD82D – JUNE 2018 – REVISED SEPTEMBER 2022

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