Rainbow-electronics DS1678 Instrukcja Użytkownika

1 of 26 100101FEATURES§ Real-time clock (RTC)/calendar in binary-coded decimal (BCD) format counts seconds,minutes, hours, date, month, day of the we

DS167810 of 26once any events that are being recorded have completed. The value in the MIP and ME bits will remain a1 until the mission has complete

DS167811 of 26written to the two event 0 elapsed time from last event registers, the subsequent event log will be writtento address locations 0000h

DS167812 of 26TIME-OF-DAY ALARM BITS Table 1ALARM REGISTER MASK BITS (bit 7)SECONDS(MS)MINUTES(MM)HOURS(MH)DAYS(MD)1 1 1 1 ALARM ONCE PER SECOND0 1

DS167813 of 26CLR - Clear Enable – This bit enables the memory to be cleared. When this bit is set to a one and theclear memory (CM) bit in the stat

DS167814 of 26With the DIS0 bit set to a zero and the DIS1 bit set to a one, the ETC will increment every time thesingle minutes byte in the RTC is

DS167815 of 26locations 0000h and 0001h, overwriting the original data. Likewise, subsequent samples will incrementthrough the event log registers,

DS167816 of 26MIP - Mission in Progress – This bit indicates the sampling status of the DS1678. If MIP is logic 1, thedevice is currently on a “miss

DS167817 of 26MSB (40h). These will be helpful in recovering all of the data if a rollover occurs. The address pointerwill point to the oldest event

DS167818 of 26and generates the START and STOP conditions. The DS1678 operates as a slave on the 2-wire bus.Connections to the bus are made via the

DS167819 of 26Figure 4 details how data transfer is accomplished on the 2-wire bus. Depending upon the state of theR/ W bit, two types of data tran

DS16782 of 26DESCRIPTIONThe DS1678 Real-Time Clock Event Recorder records the time and date of a non-periodic, asynchronousevent each time the INT

DS167820 of 26ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground -0.3V to +6VOperating Temperature -40°C to +85°CStorage Temperature -55

DS167821 of 26AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C, VCC = 4.5V to 5.5V)PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTESSCL Clock F

DS167822 of 262-WIRE SERIAL COMMUNICATION WITH DS1678 Figure 4A210W 0A0W1S 1 0 A1 A000 A A PSDASCLDevice Address Byte Memory Address ByteStartDS1678

DS167823 of 26EVENT RECOGNITION TIMING DIAGRAM Figure 6aEVENT RECOGNITION TIMING DIAGRAM Figure 6b/INTEvent 1 Event 2Good EventstGLITCHtEVENT/INTBad

DS167824 of 26START MISSION FLOW CHART Figure 7yesStart viaComputerStart viaExternal EventMem Clr =1noClearMemoryWrite a 1 tothe MIP bitThe ME bit i

DS167825 of 26ROLL OVER FLOW CHART Figure 8yesEC isIncrementedyesINT InputActivatednoContinue toMonitor InputyesMemoryFullnoETC Written to Event 0an

DS167826 of 26NOTES:1. After this period, the first clock pulse is generated.2. A device must initially provide a hold time of at least 300ns for

DS16783 of 26The block diagram in Figure 1 shows the main elements of the RTC event recorder. The device has fourmajor components: 1) 64-bit RTC and

DS16784 of 26DS1678 BLOCK DIAGRAM Figure 1SIGNAL DESCRIPTIONSThe following paragraphs describe the function of each pin.VCC – VCC is a +5V input sup

DS16785 of 26INT (Interrupt Input/Output) – The INT pin is an I/O that will be activated by an external device tosignify an event has occurred an

DS16786 of 26CLOCK ACCURACYThe accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the matchbetween the capaciti

DS16787 of 26Entering a value greater than 07FFh will result in the address location associated with the value of thelowest 11 bits of the address.T

DS16788 of 26DS1678 RTC AND CONTROL PAGE Figure 2aADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION00 0 10 SECONDS SECONDS01 0 10 MIN

DS16789 of 26DS1678 EVENT ELAPSED TIME DURATION Figure 2bADDRESS REGISTER0000 Event 1 Elapsed Time from Last Event Counter LSB0001 Event 1 Elapsed T