UM0452

Behavior of LEDS and buzzer

25/30

5.2

Application LEDs

There are three application specific LEDs on the board:

1.

communication occurring in the application.

Note:

2.

Alarm LED: This is a red LED (ALARM) which lights up in accordance with the OS

output signal of the TS1 sensor. The behavior of the OS output signal is explained in

Oversaturation alarm in Section 4.3.7: Alarms.

Note:

When TS1 is not selected, this LED (ALARM) lights up continuously and the alarm LED for

the OS output of TS2 is shown by BUZZ LED.

3.

Buzzer LED: This LED lights up whenever there is a buzzer alarm from TS2.

5.3

Buzzer

There is one buzzer present on the board. This buzzer is attached to the temperature sensor

2 (TS2, TSSOP-8) package.

The operation of the buzzer depends on the polarity set in the configuration register:

●

If the polarity selected in the configuration register is LOW then :

a)

Default state: buzzer sounds

b)

Temperature rises above oversaturation temperature (Tos): buzzer goes OFF

c)

Temperature falls below Thys: buzzer sounds

●

If the polarity selected in the configuration register is HIGH, then:

a)

Default state: buzzer OFF

b)

Temperature rises above Tos: buzzer sounds

c)

Temperature falls below Thys: buzzer OFF