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| MLX90720 One Button Timer Features and Benefits Flexible timer chip thanks to several configurations and options Low cost - minimal external components Low power consumption guarantees a long operation life on a low cost 1.5V button cell COB (Chip-On-Board) package technology for compact and low cost implementation Accurate timing based on low power crystal oscillator Output for driving an external transistor Applications Autonomous kitchen timer Parking timing reminder key ring Ordering Information Part No. MLX90720 Temperature Suffix S Package die Temperature Range 0C to 85C Functional Diagram XIN VDD VSS XOUT Bi SEGi Description The electronic timer device is powered by a 1.5V button cell, is programmable from 0 to 99 minutes, with 2 beep cycles at the end of countdown. The countdown mode is indicated with a blinking display. The timer is provided with an internal memory that allows the memorization of the last programmed time. The chip automatically enters sleep mode when not in use. The device can be used in several configurations and has several options, which are described below. The chip is designed to be used with a dual backplane LCD. 90720 Record memory Display driver CAP1 Timebase CAP2 Seconds counter Min/ Half-min Control RELO Key logic BUT1 BUT2 MTST MSEL FST TEST Sound REC BUZ The timer chip has an output ( RELO ) for driving an external low power NPN bipolar transistor. This transistor could be used for driving a switching element (relay). It can be connected directly (base to RELO) or through a resistor from 100 to 200 ohms. MLX902xx Name of Sensor MLX90720 One Button Timer Rev Y.X 1 Page 22/Aug/98 Rev 1.0 Page 1 30/Nov/00 MLX90720 One Button Timer Configuration 4: Seconds mode. General Description The electronic timer is a self-powered device, programmable from 0 to 99 minutes, with ringing at the end of countdown. The timer has an internal memory which stores the last programmed time. An auto shut-off and a validation of the countdown (blinking display) are also provided. The chip is designed to be used with a 2 backplanes LCD : Operation Voltage 3V Driving condition 1/2 Duty, 1/2 Bias The timer chip has an output ( RELO ) for driving an external low power NPN bipolar transistor and a buzzer driver output. Options In each configuration two options are possible: the restore memory option and the second fast increment option. The restore memory option is available in one button version (OBT: One Button Timer) or two button version (TBT: Two Button Timer) (see functional description on following pages). With this option the last programmed time can be restored. The chip operates in OBT mode with restore memory, if pin REC is connected to VDD and operates in TBT mode, if REC is connected to VSS and button 2 is bonded. When the restore function is not used, REC is connected to VSS and button 2 is not used. The TBT also has more flexibility in programming mode, as the time can not only be increased but also decreased. The second fast increment option can be chosen to have two increment speeds in programming mode to set the desired time. The chip operates in this mode if pin FST is connected to Vdd. RELO output The timer chip has an output ( RELO ) for driving an external low power NPN bipolar transistor. This NPN transistor could be used for driving a switching element (relay). It can be connected directly (base to RELO) or through a resistor from 100 to 200 ohms. Buzzer output The chip has an output driver to drive a magnetic transducer. The frequency generated at this output is 2048 Hz. Modes The timer has 6 modes of operation: Wake up mode Programming mode Count down mode Ringing mode Wait mode Power down mode The timer is always in one of these modes. Configurations 4 different configurations are possible and are defined according to the following table: MTST Configuration 1 Configuration 2 Configuration 3 Configuration 4 0 1 0 1 MSEL 0 0 1 1 Functional description The following paragraph describes the functionality of the asic in configuration 1, but with different options. Basic OBT The basic One Button Timer has no second button, no restore memory and no second fast increment option. 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. 1: connected to Vdd. 0: connected to Vss. Configuration 1: Minutes mode (a) : countdown in minutes and the last minute is displayed in seconds. Configuration 2: Minutes mode (b): countdown in minutes and the last minute is not displayed in seconds. Configuration 3: Minutes mode (c) : countdown in minutes with a 0.5 min. step from 10 min to 1 min and the last minute in seconds. MLX90720 One Button Timer Page 2 Rev 1.0 30/Nov/00 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 pressrelease. 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 MLX902xx Name of Sensor MLX90720 One Button Timer 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. 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 more than 1 second. In this case the chip enters programming mode again, displaying 00. Rev Y.X 3 Page 22/Aug/98 Rev 1.0 Page 3 30/Nov/00 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. 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. 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 (nonblinking), 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. MLX90720 One Button Timer Page 4 Rev 1.0 30/Nov/00 MLX90720 One Button Timer TBT with restore memory The second button (button 2) has two functions: it is used to restore the last programmed time and is used to decrement the timer value in programming mode. Whatever mode the chip is in, when button 2 is pressed (long press in programming mode and short press in the other modes) and button 1 is not pressed, the last programmed time is restored (not blinking) and the chip enters programming mode. Wake up: Pressing button 1 or button 2 always wakes up the chip within two seconds (debouncing + startup oscillator): If the chip is activated by pressing button 1, the time value 00 is displayed (not blinking). If the chip is activated by pressing button 2, the last programmed time is restored (not blinking) The chip always enters programming mode. Programming mode: In this mode the last programmed time can be displayed by pressing button 2. Programming of the timer is done with button 1 and button 2. When button 2 is not pressed: If button 1 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. with one minute. If button 1 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. While button 1 is pressed: If button 2 is pressed for a short time, the chip enters decrement mode. Each short press on button 2 decrements the time with 1 LSD, and when pressing for more then 2 seconds, the chip enters fast decrement mode, decrementing the programmed time with a speed of 4 LSD per second. If button 2 is not pressed for more then 1 second, the chip enters increment mode again. If button 1 is released and button 2 still pressed, the last programmed time is restored. In increment mode, when exceeding 99 minutes the timer jumps to 00 minutes. In decrement mode, when passing 00 minutes the timer jumps to 99 minutes. If no button is pressed for more than 2 seconds 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: In this mode the last programmed time can be restored by pressing button 2 for more than 1 second. 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 the countdown by pressing button 1 or button 2 for more than 1 second. If a reset is generated with button 1, the value 00 is displayed and the chip enters programming mode. If a reset is generated with button 2, the restore function is activated and programming mode is entered. Ringing mode: In this mode the last programmed time can be restored by pressing button 2. At the end of the countdown, a ringing is produced, which warns the user : - 10 groups of 3 sounds = 10 sec. - a delay of 20 seconds - 10 groups of 3 sounds 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. This mode can be interrupted by pressing button1. In this case the value 00 is displayed (not blinking) and the chip enters programming mode. Ringing mode can also be interrupted by pressing button 2. In this case the last programmed time is restored and programming mode is entered. Power down mode: When the chip enters this mode the oscillator and the display are disabled, and current consumption is minimized. MLX902xx Name of Sensor MLX90720 One Button Timer Rev Y.X 5 Page 22/Aug/98 Rev 1.0 Page 5 30/Nov/00 MLX90720 One Button Timer Other configurations In configuration 2, the countdown of the last minute is not displayed in seconds. The restore memory option (in One Button Timer version or Two Button Timer version) and the second fast increment option can be selected. Thus, except for the display of the last minute countdown, the functional behavior remains the same as in configuration 1. In configuration 3, the countdown of the last minute is displayed in seconds. The least significant digit is variable. For the first 10 minutes, the LSD is 0.5 minutes, above 10 minutes the LSD is 1 minute. This can also be displayed on the LCD with one additional character. This means that both programming, countdown and restore are done with a resolution of 0.5 minutes for the first 10 minutes. Note: also the first minute is programmed in steps of 0.5 minutes, while during countdown it is displayed in seconds. The restore memory option (in One Button Timer version or Two Button Timer version) and the second fast increment option can be selected. All other details are as in configuration 1. Configuration 4 has the same functionality as configuration 1, but is counting seconds instead of minutes. This means that the LCD is always displaying seconds, programming and countdown is always in steps of 1 second, and the maximum time that can be programmed is 99 seconds. MLX90720 One Button Timer Page 6 Rev 1.0 30/Nov/00 MLX90720 One Button Timer LCD segment description pin BP0 BP1 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 B0 D2 D1 F2 E2 A2 G2 B2 C2 F1 E1 A1 G1 B1 C1 A0 BP0 B1 BP1 Pin description Name SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 B0 B1 MTST REC BUT1 Type output output output output output output output output output output input input input Description LCD Segment 0 driver LCD Segment 1 driver LCD Segment 2 driver LCD Segment 3 driver LCD Segment 4 driver LCD Segment 5 driver LCD Segment 6 driver LCD Segment 7 driver LCD Backplane 0 driver LCD Backplane 1 driver Configuration input 1 One/two button selection Button 1 input Rev Y.X 7 Page 22/Aug/98 Name FST MSEL VDD REL0 VSS BUZ TST XOUT XIN BUT2 CAP1 CAP2 Type input input supply output supply output input output input input output input Description Second increment option Configuration input 2 Power supply Output driver ground Buzzer output Test pin Xtal oscillator output Xtal oscillator input Button 2 input Charge pump cap. out Charge pump cap. in MLX902xx Name of Sensor MLX90720 One Button Timer Rev 1.0 Page 7 30/Nov/00 MLX90720 One Button Timer MLX90720 Electrical Specifications DC Operating Parameters TA = 0oC to 85oC, VDD = 1.2V to 1.7V (unless otherwise specified) Parameter Standby current cons. Operating current cons. Parameter Oscillator frequency Parameter Driver source current Parameter Symbol Isb Iop Symbol Fosc Symbol Irelo Symbol Test Conditions VDD = 1.5V VDD = 1.5V, buzzer output not loaded Test Conditions VDD = 1.5V Test Conditions VDD = 1.2V Test Conditions Min -1 -1 Test Conditions Min Typ 2048 1.5 Min Min Typ 32768 Min Typ Max 200 3 Max Units nA uA Units Hz Typ 0.4 Typ Max Units mA Max 1 1 Max Units sec % Units Hz V timing tolerance for times < tacc1 2 minutes timing tolerance for times > tacc2 2 minutes Parameter Buzzer frequency Buzzer voltage Symbol Fbuz Vbuz MLX90720 One Button Timer Page 8 Rev 1.0 30/Nov/00 MLX90720 One Button Timer Applications Example: One button timer in configuration 1 LCD BUT1 BUT2 REC VDD VSS XIN XOUT B0-1 SEG0-7 CAP1 90720 CAP2 RELO MTST MSEL FST TEST BUZ restore function active second fast increment not active Applications Example: Two button timer in configuration 3 with output driver LCD BUT1 BUT2 REC VDD VSS XIN XOUT B0-1 SEG0-7 CAP1 90720 CAP2 RELO MTST MSEL FST TEST BUZ second fast increment active MLX902xx Name of Sensor MLX90720 One Button Timer Rev Y.X 9 Page 22/Aug/98 Rev 1.0 Page 9 30/Nov/00 MLX90720 One Button Timer MLX90720 bondpad placement Use Template: package.vst For the latest version of this document, Go to our website at: France Melexis France Tour Arago, 5 rue Bellini, 92806 Puteaux-La-Defense, France. Phone: +33 1 47 78 11 34 Fax: +33 1 47 78 06 35 E-mail: sales_france@melexis.com www.melexis.com Or for additional information contact Melexis Direct: Italy USA Melexis Inc. 41 Locke Road, Concord, NH 03301 Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com Fax: +1 603 223 9614 Dimacred IRL Via Papa Giovanni XXIII no. 25, 20046 Biassono, Italy Phone: +39 039 249 4856 Fax: +39 039 491773 E-mail: sales_italy@melexis.com Japan Satori Electric Co., LTD 1-14-10 Shiba, Minato-Ku, Tokyo, Japan Phone: +81 3 3452 7171 Fax: +81 3 3769 2197 E-mail: sales_japan@melexis.com United Kingdom Silicon Concepts PCB Lynchborough Road, Hampshire GU30 7SB, United Kingdom Phone: +44 1428 751 617 Fax: +44 1428 751 603 E-mail: sales_uk@melexis.com Germany Am Seestern 8, 40547 Dusseldorf, Germany Phone: +49 211 5360212 Fax: +49 211 5360250 E-mail: sales_de@melexis.com Taiwan Beechwood Int'l Taiwan Co. Room 8, 17F, No. 189, Taipei, Taiwan Phone: +886 2 2739 3322 E-mail: sales_taiwan@melexis.com Fax: +886 2 2739 3090 MLX90720 One Button Timer Page 10 Rev 1.0 30/Nov/00 MLX90720 One Button Timer MLX902xx Name of Sensor MLX90720 One Button Timer Rev Y.X 11 Page 22/Aug/98 Rev 1.0 Page 11 30/Nov/00 MLX90720 One Button Timer MLX90720 One Button Timer Page 12 Rev 1.0 30/Nov/00 |
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