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This is a day and hour countdown timer module, which is .50 VDC operated, 4 digits LCD, and with 16 mm digit height, 99 days 23 hours as maximum capacity timer. This Countdown Timer Module includes four buttons, "start and stop" at the left, then the settings of day and hour, and "reset" at right. Six output poles with soldering pads at both edges of PCB deliver different wave forms to provide user comprehensive applications, such as power on/off control of electrical device, security device control, automatically alarm system activation. Many other versions are available. Please refer to the last paragraph for Versions List. UM4 (AAA) battery mounted on the rear side of module.
As people know the most important feature of a timer is constantly reminding the user that the set time is up. But audible alarm wastes too much power. To continually keeping piezo buzzer goes off, the battery power should be exhausted for just few minutes. In order to make this feature comes realistic, our R/D developed a new program called PSEA (power saving endless alert) for the alarm. This model is equipped with this PSEA feature as a standard. However, if people prefer to has traditional one minute alert, it can be down too.
Further to the PSEA alert, like mentioned above, the timer provides another method of endless alert, called visual endless alert, i.e., when counting expired, as well as audible alert, the full LCD becomes blinking. So this timer provides dual alert, audible and visual.
The display resolution is changed automatically, from 1 hour to 1 minute, and then 1 second. Due to the limitation of 4 digits LCD screen, with constant resolution the display cannot show the counting details after counting down to one day. Usually display shows hour reading only. User cannot see the minute reading. But this timer provides the solution. It changes the display format from DD:HH to HH:MM. Applying the same method after counting down after 1 hour too. The display changes to MM:SS instead of HH:MM. In other word, this timer has been programmed to change its display format properly, geniusly, and friendly.
Furthermore, "count up" feature is added as a option to provide user to know how long the time is expired. With this feature, user can use this timer as a chronometer too. It can count up to 9999 days. Indeed it is an ideal instrument to measure long term activities, or lifespan.
Capacity: 99 days 23 hours
Resolution: 1 second ( display automatically changed to an appropriate formate)
Setting Interval: 1 hour (minimum)
PCB Size: 70 x 51.2 mm
Plastic Frame: 58 x 40 mm
Thickness: 7 mm (battery not included )
Screen Size: 49.3 x 22.3 mm
Number of Digit: 4 digits
Digit Height: about 16.00 mm
Button:tact s/w, 3 to 4 keys, on the front
Power Source: +1.5 VDC; use one piece of UM4 (AAA); battery holder mounted on the rear side but battery not included
Operating Voltage: +1.20 ~ + 1.70 volts
Typical Current Drain: 3 μA in normal condition; 400 μA when beeping
Operation Temperature: -10 ~ +50 °C
Storage Temperature: -20 ~ +60 °C
Audible Alert Methods:
Regular audible alert for 1 minute at 4 K Hz
Power Saving Endless Alert circuit (called PSEA circuit), beep six times then wait for 10 seconds and repeat again; never stop unless the “Stop” key depressed>
B1 Pole - Repeat 0.5 sec on and 2.5 sec off for 6 times then wait for 10 seconds, and repeat again; never stop unless the "Stop" button depressed
B2 Pole - After countdown to zero, repeat 1 sec ON, 1 sec OFF for one minute
B3 Pole - Level, 1.5 VDC for 1 minute after timer countdown to zero
Light Pole - Level, 1.5 VDC when timer starts to counting; then turn to 0 VDC when counts down to zero (for non-count up version only)