Datasheet

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.
4. All the registers show the default readings at first selection.
5. Press the Loop button to continuously read the temperature in the GUI.
6. 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.
7. 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.
8. The Once button is used to read the instantaneous value of the temperature value from
the sensor.
9. 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:
a) 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
register). This alarm glows as BAW alarm in the GUI. As the measured
temperature becomes greater than the below alarm window setting, the alarm
switches off.
b) 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
register). This alarm glows as AAW alarm in the GUI. As the measured
temperature becomes lower than the above alarm window setting, the alarm
switches off.
c) 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
register and critical temp register is 0x00, therefore alarm conditions for AAW and ACI are
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