TMP107 datasheet(32/40 Pages) TI

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Supply Bypass

Capacitor

V+

ALERT2

I/O2

ALERT1

GND

I/O1

GND

I/O2

GND

I/O1

V+

PCB border

Capacitor

V+

TMP107

SBOS716B – MAY 2015 – REVISED SEPTEMBER 2015

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9 Power Supply Recommendations

The TMP107 device operates with a power supply in the range of 1.7 V to 5.5 V. The device is optimized for

operation at a 3.3-V supply, but measures temperature accurately for the full supply range. For best

performance, use a 0.1-µF power-supply bypass capacitor. Place the bypass capacitor as close as possible to

the supply and ground pins of the device. Applications with noisy or high-impedance power supplies may require

additional bypass capacitors to reject power-supply noise.

10 Layout

10.1 Layout Guidelines

Mount the TMP107 to a PCB as shown in Figure 44. Obtaining acceptable performance with alternate layout

schemes is possible, however this layout produces good results and is intended as a guideline.

•

Bypass the V+ pin to ground with a low-ESR ceramic bypass-capacitor. The typical recommended bypass

capacitance is a 0.1-

μF ceramic capacitor with a X5R or X7R dielectric. The optimum placement is closest to

the V+ and GND pins of the device. Take care to minimize the loop area formed by the bypass-capacitor

connection, the V+ pin, and the GND pin of the IC.

•

Use larger copper area pads to reduce self-heating and lower thermal resistance to the environment.

•

If possible, use PCB boards with thick copper layers.

•

If possible, do not use stain to protect the IC because stain can increase thermal resistance.

10.2 Layout Example

Figure 44. Layout Example

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