Rainbow-electronics DS1678 Uživatelský manuál

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1 of 26 100101
FEATURES
§ Real-time clock (RTC)/calendar in binary-
coded decimal (BCD) format counts seconds,
minutes, hours, date, month, day of the week,
and year with leap-year compensation and is
year 2000-compliant
§ Logs up to 1025 consecutive events in read-
only nonvolatile (NV) memory
§ The event trigger is user-programmable and
can be triggered by the falling edge, rising
edge, or rising and falling edges of the
INT pin
§ Event count register provides data on the
number of events that have been logged in the
current event logging mission
§ Programmable real-time clock alarm
§ 32-byte, battery-backed, NV RAM for data
storage
§ Two-wire serial interface allows for a simple
connection to your system
§ Three resolution options are available to trade
off accuracy versus maximum time between
events
§ Underwriters Laboratory (UL) recognized
PIN ASSIGNMENT
Package dimension information can be found at:
http://www.maxim-ic.com/TechSupport/PackInfo.htm
PIN DESCRIPTION
V
BAT
- Battery Supply
X1 - Crystal Input
X2 - Crystal Output
INT - Interrupt Input/Output
GND - Ground
SDA - 2-wire Input/Output
SCL - 2-wire Clock Input
V
CC
- +5V Supply
ORDERING INFORMATION
DS1678 8-Pin DIP (300-mil)
DS1678S 8-Pin SOIC (208-mil)
DS1678
Real-Time Event Recorde
r
www.maxim-ic.com
8-Pin SOIC (208-mil)
1
2
3
4
5
6
7
8
V
BAT
Vcc
GND
INT
SCL
SDA
X2
X1
8-Pin DIP (300-mil)
TYPICAL OPERATING CIRCUIT
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1 2 3 4 5 6 ... 25 26

Shrnutí obsahu

Strany 1 - Real-Time Event Recorde

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

Strany 2 - DESCRIPTION

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

Strany 3

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

Strany 4

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

Strany 5

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

Strany 6 - CLOCK ACCURACY

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

Strany 7

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

Strany 8

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

Strany 9

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

Strany 10 - INT pin being

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

Strany 11 - CLOCK, CALENDAR, AND ALARM

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

Strany 12 - 12 of 26

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

Strany 13 - INT output pin

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

Strany 14 - 14 of 26

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

Strany 15

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

Strany 16 - INT pin will go low

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

Strany 17 - 17 of 26

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

Strany 18 - 18 of 26

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

Strany 19 - 19 of 26

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

Strany 20 - 1.284 x V

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

Strany 21 - 21 of 26

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

Strany 22 - 22 of 26

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

Strany 23 - 23 of 26

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

Strany 24 - 24 of 26

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

Strany 25 - ROLL OVER FLOW CHART Figure 8

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

Strany 26 - 26 of 26

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

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