Battery-powered microkontroller - BAT01
Complex ground for battery-powered applications with microcontroller AT89C55WD. Use of the standard microcontroller and additional logic gets base for different battery-powered applications. E.g. encoders for the remote control work waves or infrared, complexes for the manufacturer of the sound and light effects, measuring devices, stroboscopes, recorder devices of data, stopwatches, etc.
Advantage this applications is that is the consumption in preparation 20 to the 50 way smaller than when would use are built in the microprocessor possibility switching off (power down). Then the consumption would be to 100uA.
At the testing of work show up that the complex can at the room temperature work and on the stable voltage from 3.5VDC. However, if the battery excessively weakens and after switch on considerably drop the voltage on her (< 2,5V), happens that microcontroller does not start, and also that the control logic not did not switch off the power supply microcontroller. This is not importantly because batteries anyway have emptied, but about this phenomenon needs pays attention.
power supply: 4.5V (4..5.5V)
consumption in preparation with inactive CPU: < 1uA, typically 0.5uA
consumption in the work: approximately 10mA with the crystal 4MHz
keyboards: 3 * 4
waking up of processors: pressure on the any key on the keyboard (the delay is approximately 10ms)
switching off microprocessor: across the programmatical loop which activates the turn off power supplies
the insured reset and external watchdog who in case of jamming processors turns off the power supply
Down is the example of realization of prototype of application. Logical chips and crystal have found below the microcontroller who on the pedestal. Supports the 12 push button and has is predicted 2 optocoupler output.
On the basis of this schemes has been realized the complex for the chronometry resolutions 1ms also the indication when has been measured the time in set borders.
Options: Towards your ideas can adjust the complex and for your needs.
E.g. beside the supplement serial EEPROMA and RS232 of drivers can on the field measure data and write down them in EEPROM, and later also data will empty across RS232 of interface on your PC. Also it is likely make the parametring work of device across commands which send the serial port with PCs.