UM1539 datasheet(19/46 Pages) STMICROELECTRONICS

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UM1539

Getting started

Doc ID 023106 Rev 1

19/46

error message appears in the GUI. In the case of an error, re-check the address with

the correct option.

All the registers show the default readings at first selection.

Press the Loop button to continuously read the temperature in the GUI.

Configure the different registers through the GUI and observe the behavior of the

sensor. The bits of the configuration register can be individually selected using the GUI.

Sliders for “Alarm Temp Upper Boundary”, “Alarm Temp Lower Boundary” and “Critical

Temp Register” can be used to separately configure the upper boundary, lower

boundary and critical limit for temperatures. Press the Write button individually for all

three limits to write the value inside the sensor registers.

The Once button is used to read the instantaneous value of the temperature value from

the sensor.

The Loop button is used to continuously read the temperature value from the sensor

and display the same in the GUI.

10. There are 3 different alarms supported by this sensor:

Below alarm window (BAW):

This alarm occurs when the measured temperature goes below the temperature

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

temperature becomes greater than the below alarm window 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 above alarm window 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 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) also glows.

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

Pressing 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. The Loop button,

pressed continuously, monitors the alarm conditions and displays them in the GUI. Stopping

the Loop button latches the last conditions of alarms in the GUI. These are refreshed either

by again using the Loop or Once read button.

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.

11. SMBus timeout is used to demonstrate the timeout feature of the STTS2002. Checking

the “TimeOut Test Enable” checkbox enables the slider for entering the timeout delay.

The slider can be used to select the timeout delay in milliseconds. If the delay is

between 20-29 msec, the device does not time out and returns ACK to communication

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