UM1539 datasheet(17/46 Pages) STMICROELECTRONICS

17 / 46 page

UM1539

Getting started

Doc ID 023106 Rev 1

17/46

1.2.14

GUI window for the STTS751 temperature sensor

The STTS751 temperature sensor is available in two versions:

●

STTS751-0

●

STTS751-1.

Address configuration for this sensor is done using the jumper CN5 present on the daughter

card (explained in Section 1.2.8).

The steps to operate the STTS751 sensor in GUI mode are as follows:

Place the daughter card on the motherboard.

Select the address of the daughter card using CN6/CN5 on the daughter card (refer to

Section 1.2.8), as shown in Figure 10.

Power up the motherboard using USB power.

Select the STTS751 sensor in the GUI and then select either STTS751-0 or STTS751-

1 from the Radio button in the GUI, as shown in Figure 11. Then select the address

from the dropdown menu of the GUI.

Configuration register bits can be individually configured using the GUI.

Sliders can be used to configure the values inside the upper temp register, lower temp

to be used for each value to be written 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.

There is one alarm output in the STTS751 by the name EVENT. When the temperature

is above the value configured inside the upper temp register or is equal to or lower than

the value inside the lower temp register, the EVENT signal is asserted and is seen as

D5 LED glowing on the motherboard. In the GUI, the status of the EVENT pin is seen

on pressing the One-shot or Loop button.

10. If the EVENT condition exists, then pressing the ARA button returns the sensor

address.

11. One-shot write is used to read the temperature once when the sensor is in Standby

mode and then again return the sensor in Standby mode.

12. SMBus timeout is used to demonstrate the timeout feature of the STTS751. Checking

the “TimeOut Test Enable” checkbox enables the timeout feature of the STTS751 by

writing inside the “SMBus timeout enable” register of the sensor. The slider can be

used to select the timeout delay in milliseconds. If the delay is between 20-30 msec, the

device does not time out and returns ACK to communication and is seen as ACK

glowing in the GUI. For timeout delay greater than 30 msec, the device returns NACK

to communication and is seen as NACK glowing in the GUI. This ACK and NACK is the

response from the sensor to I2C communication along with the delay in between.

13. The I2C speed can be selected to be one of 100 kHz or 400 kHz using the Radio button

and Write button.

UM1539 Datasheet(PDF) 17 Page - STMicroelectronics

UM1539 Datasheet(HTML) 17 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Datasheet Download

Link URL