Microcontroller Based Chronometer (clock/timer) MP-1010

The MP-1010 is a precision multi-functional quartz chronometer, featuring a two-Iine display readout which can display Clock and timer functions simultaneously.

FEATURES:

1. 24 Hour clock in HH.MM format and 10 Hour Timer in H.MM.SS format.

2. Clock can be programmed to display in Local time or GMT.

3. Individual clock hour and clock minute setting.

4. Timer can be Up or down timer.

5. Individual timer hour, timer minute, timer seconds setting.

6. Timer can be preset in the range of 10 Hour time.

7. Brightness control of both display.

8. Only three keys are used to set the parameters of the Clock/Timer.

9. All key operations are single stroke.

10. Clock/Timer runs even during power off (no display).

11. Contains Lithium backup battery, which is connected to serial RTC that maintains the RTC clocks as well as the settings programmed during power failure.

12. Clock and timer are displayed through seven segment LED displays.

13. Clock/Timer is a microcontroller-based unit with watchdog timer and brown out Detection enabled. When supply voltage drops below operating range, it resets the Controller and starts again automatically when voltage is restored to operating range.

14. RTC-chip communication error is reported on Seven segment displays ('HELP', 'FAULt').

BRIEF TECHNICAL SPECIFICA TION:

The Clock/Timer is an 8-bit RISC microcontroller based system. The Microcontroller features 4K program Memory, 192 bytes RAM, Watch dog timer, Brown out detection, 22 Input/outputs, UART, CCP , 5 channel ADC, IlC/SPI etc, The heart of the Clock is Real Time Clock IC with lithium battery backup. The Real Time Clock is a IlC device and requires only two I/O lines for communicating with Microcontroller.

The Clock/Timer operates from 18V to 32V DC Power Supply Voltage. The Power consumption of the system is about 4 watts at 24 V DC. The weight of the Clock/Timer is about 300 grams.

When Clock/Timer is powered on. all seven segments display of clock display and timer displays indicate "8" for about two seconds. This is to verify visually all segments operating condition. Then the communication with the RTC chip is checked. If there is communication error, then displays will change to "HELP FAULt". In this condition the watch dog timer (WDT) embedded in the microcontroller will continue to run, so after about 2 sec the WDT will reset the microcontroller. So microcontroller executes from the beginning and again tests the RTC communication. If the problem persists, then the display win indicate always "HELP FAULt".

When the processor encounters no other problems, the displays meant for clock and timer indicate appropriate times. The timer comes on with either reset or running or Stop State. The state depends on the last power off.

There are three keys, which are used for more than one function. The keys are named as FUNC Key, ST/SP/INC Key and RST/DEC Key.

Each function on the Clock/Timer is assigned a function pointer which identifies the type of function that is being set or altered. The Function Pointer is a two-digit number, which is displayed on the last two seven segment displays of either clock, or timer display.

It meets the following temperature severity for qualification approval:

a) -40°C to + 70°C operating range.

b) -50°C to +85°C Storage range.

c) 40°C, 95% Relative Humidity.