MLX90720 Datasheet, PDF(3/12 Page) List of Unclassifed Manufacturers

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MLX90720 Datasheet, PDF (3/12 Pages) List of Unclassifed Manufacturers – One Button Timer

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MLX90720

One Button Timer

If the button is pressed and released (short press),

the single increment mode is selected, in which the

time value is incremented with one Least Significant

Digit, which corresponds to 1 minute.

If the button is pressed for more then 1 second, the

chip enters the fast increment mode, increasing the

value of the programmed time with a speed of 4 LSD

per second. If the button is released, the single

increment mode is selected, in which the time value

is incremented with one LSD on each cycle of press-

release. The timer can switch back and forth

between single and fast increment mode.

When exceeding 99 minutes the timer jumps to 00

minutes.

During the programming mode, reset is not available.

If the button is released for more than 2 sec and the

display is not at 00 the chip enters countdown mode.

When 00 is displayed and no button has been

pressed for more than 45 sec. the chip enters power

down mode.

Countdown mode:

If the timer is in programming mode, and the loaded

value is different from 00, when the button is

released for more than 2 seconds, the countdown

starts. The countdown mode is indicated with a

blinking display with a cycle of one second (0.5 sec's

on, 0.5 sec's off). The countdown of the last minute

is diplayed in seconds: 1min, 59s, 58s,...0s.

At the end of the countdown, the chip enters ringing

mode.

Reset is possible during countdown by pressing the

button for more than 1 second. In this case the chip

enters programming mode again, displaying 00.

Ringing mode:

At the end of countdown, a ringing is produced,

which warns the user :

- 10 groups of 3 sounds, total duration 10 seconds

- a delay of 20 seconds

- 10 groups of 3 sounds, total duration 10 seconds

The second group of sounds starts 30 seconds after

the end of countdown. In this way a time with a

resolution of 30 seconds can be achieved.

At the end of the cycle, the timer value 00 is returned

and programming mode is entered.

During the ringing mode, the display continues to

blink. The ringing mode can be interrupted by

pressing the button (short or long press). In this case

the chip enters programming mode. The value 00 is

shown.

Power down mode:

When the chip enters in this mode the oscillator and

the display are disabled and the current consumption

is minimized.

Note that waiting mode is not available.

OBT with second fast

increment

The basic One Button Timer can have the second

fast increment option. This has only an influence

during programming mode.

Wake up:

The first press enables the wake up of the chip within

two seconds (debouncing + startup of the oscillator).

The value 00 is displayed (non-blinking) and the chip

enters programming mode.

Programming mode:

The programming of the timer is implemented with

one button. In this mode the display doesn't blink.

If the button is pressed and released (short press),

the single increment mode is selected, in which the

time value is incremented with one Least Significant

Digit, which corresponds to 1 minute.

If the button is pressed for more than 1 second, the

chip enters the fast increment mode, increasing the

value of the programmed time with a speed of 4 LSD

per second. If the button is pressed for more then 5

seconds, the second fast increment mode is

activated, increasing the time with 8 LSD per second.

If the button is released, the single increment mode

is selected, in which the time value is incremented

with one LSD on each cycle of press-release. The

timer can switch back and forth between single and

fast increment mode.