UM1539 datasheet(14/46 Pages) STMICROELECTRONICS

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Getting started

UM1539

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Doc ID 023106 Rev 1

temperature becomes greater than the BAW setting, the alarm switches off.

Above alarm window (AAW):

This alarm occurs when the measured temperature goes above the temperature

setting performed in the alarm temperature upper boundary register (upper temp

temperature becomes lower than the AAW setting, the alarm switches off.

Above critical temperature (ACI):

This alarm occurs when the measured temperature goes above the temperature

setting performed in the critical temperature register. This alarm glows as the ACI

alarm in the GUI. As the measured temperature becomes lower than the critical

alarm setting, the alarm switches off.

The “Alarm” icon also glows in the GUI only when the O/P control bit is enabled in the

configuration register and one of the above mentioned alarms has occurred, and then only

the alarm LED onboard (D5) glows.

BAW, AAW, and ACI alarm statuses can be seen in the GUI either in Once or Loop mode.

Pressing of the Once button shows the instantaneous alarm conditions and latches the

same in the GUI. This condition is refreshed on again pressing the Once button. Pressing

the Loop button continuously monitors the alarm conditions and displays them in the GUI.

Stopping the Loop button latches the last alarm conditions in the GUI. These are refreshed

either by again using the Once or Loop read buttons.

For the first time address check, the default state of the upper temp register, lower temp

met and so these are seen as glowing in the GUI.

Figure 7.

GUI window for STTS424E02 temperature sensor

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