TMP116 datasheet(35/46 Pages) TI2

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TMP116, TMP116N

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SBOS740A – MAY 2017 – REVISED MAY 2019

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Application Information (continued)

The following methods can reduce the SHE:

•

System calibration removes not only the self-heating error and power-supply rejection ratio (PSRR) effect but

also compensates the temperature shift caused by the thermal resistance between the device and the

measured object.

•

If practical, use the device one-shot mode. If continuous conversion is needed, use the conversion cycle

mode with significant standby time. For example, in most cases an 8-sample averaging (125 ms) with a 1-

second conversion cycle provides enough time for the device to cool down to the environment temperature

and removes the SHE.

•

Use the minimal acceptable power supply voltage.

•

Use a printed-circuit board (PCB) layout that provides minimal thermal resistance to the device.

•

Avoid using small-value pullup resistors on the SDA and ALERT pins. Instead, use pullup resistors larger than

2 kΩ.

•

Ensure that the SCL and SDA signal levels remain below 10% or above 90% of the device supply voltage.

•

Avoid heavy bypass traffic on the data line. Communication to other devices on the same data line increases

the supply current even if the device is in SD mode.

•

Use the highest available communication speed.

8.1.1.2.3

Synchronized Temperature Measurements

When four temperature measurements are needed in four different places simultaneously, triggering by reset is

recommended. In this method, four devices are programed with control registers set to CC mode with a

conversion cycle time of 16 s. All four devices are connected to same two-wire bus with four different bus

addresses. The bus general-call reset command is issued by the master. This command triggers all devices to

reset (which takes approximately 1.5 ms) and triggers a simultaneous temperature sampling according to

configuration registers setting. The master has 16 seconds to read data from the devices.

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