MLX90720 Datasheet, PDF (4/12 Pages) List of Unclassifed Manufacturers – One Button Timer

MLX90720
One Button Timer
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 restore memory
The basic One Button Timer can have the restore
memory option, which is operated with the same
button.
Wake up:
In OBT configuration, the first press enables the
wake up of the chip within two seconds (debouncing
+ startup oscillator).
If it is a short press, the value 00 is displayed (non-
blinking), the chip enters programming mode.
If the button is pressed more than 1 sec., the restore
function is activated and the last programmed time is
displayed (non-blinking). During the first second, the
value 00 is displayed (non blinking). 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 (LSD), i.e. 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. 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.
If the button is not pressed during 45 seconds 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 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 displayed 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 waiting mode.
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 waiting mode is entered.
During the ringing mode, the display continues to
blink. The ringing mode can be interrupted by
pressing the button. A short press directly enters
waiting mode. A press of longer then 2 seconds
activates the restore function and programming
mode is entered with the restored time.
Waiting mode:
In this mode the timer value 00 is displayed and
the display is blinking. Pressing the button for more
then 2 seconds activates the restore function and
programming mode is entered with the restored
time. A short press of the button enters
programming mode at time 00.
If the button is not pressed during 45 sec the chip
enters power down mode.
Power down mode:
When the chip enters this mode the oscillator and
the display are disabled and current consumption
is minimized.
MLX90720 One Button Timer
Page 4
Rev 1.0 30/Nov/00