參數(shù)資料
型號(hào)： DS1678
廠商： DALLAS SEMICONDUCTOR
元件分類(lèi)： Timer or RTC
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP8
封裝： 0.300 INCH, DIP-8
文件頁(yè)數(shù)： 24/24頁(yè)
文件大?。?/td> 301K
代理商： DS1678
DS1678
9 of 24
written to the two Event 0 Elapsed Time From Last Event registers, the subsequent event log will be
written to address locations 0000h and 0001h, and the address pointer will be incremented with each
successive data sample. When this rollover occurs, the Roll Over Flag (ROF) in the Control register will
be set to one to indicate that the memory has rolled over at least one time.
The second option for dealing with data overrun is to simply stop the recording of events after the event
log memory has been completely used. In other words, the DS1678 will stop recording event logs after
event 1025. More precisely, when the address pointer is incremented from 07FFh to 0000h after the last
memory byte is filled with a log, the DS1678 will stop recording events. This feature is enabled by
setting the Rollover bit to 0. The device will still continue monitoring the INT pin and the event counter
will continue to increment when the INT pin is activated even though the event log memory has been
filled.
It should be noted that during an event log mission, a time stamp for the first event is recorded, but is not
included for each subsequent event. However, the time of acquisition for any event is easily determined
by considering the start time, the value in the Event Counter register, Roll Over Flag, and the address of
the particular data sample in the Event Log memory.
If no rollover has occurred in the event log memory (ROF=0), the sample time associated with any
particular data point can be calculated by multiplying the sum of the elapsed time between the events up
to that event by one second, minute, or hour depending on which resolution is selected in the DISx bits of
the Control register, and adding this elapsed time to the value in the Start Time Stamp register.
If the rollover feature has been enabled, the user can determine if rollover has occurred by reading the
value in the Events Counter register or the Roll Over Flag. The Event Counter register counts the total
number of events that have been acquired. If this value is greater than 0400h (decimal 1025) then the
user knows that rollover has occurred. If rollover has occurred, the user needs to determine how many
times rollover occurred in determining the sample time for any particular data sample.
The Address
Pointer will be pointing to the oldest data in the Event Log memory and if the memory has rolled over at
least one time, the Roll Over Flag will be set to 1.
As a safety measure, the DS1678 has been designed such that the end user cannot write to the Event Log
Memory. This prevents the falsification of event log data by writing values to event log registers.
CLOCK, CALENDAR, AND ALARM
The time and calendar information is accessed by reading/writing the appropriate register bytes. Note
that some bits are set to zero. These bits will always read zero regardless of how they are written. The
contents of the time, calendar, and alarm registers are in the Binary-Coded Decimal (BCD) format and
are year 2000 compliant.
The DS1678 can run in either 12-hour or 24-hour mode. Bit 6 of the hour’s register is defined as the 12-
or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the
AM/PM bit with logic one being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20-23 hours).
相關(guān)PDF資料
PDF描述
DS1682S 0 TIMER(S), TIME RECORDER, PDSO8
DS1682 0 TIMER(S), TIME RECORDER, PDSO8
DS1685-3 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS1687-5 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS1685Q-3 1 TIMER(S), REAL TIME CLOCK, PQCC28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1678+ 功能描述:實(shí)時(shí)時(shí)鐘 Real-Time Event Recorder RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1678J 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:2-Input Digital Multiplexer
DS1678J/A+ 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:2-Input Digital Multiplexer
DS1678K 功能描述:KIT EVAL RT EVENT RECORD DS1678 RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類(lèi)型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
DS1678S 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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