參數(shù)資料
型號(hào)： DS1678
廠商： DALLAS SEMICONDUCTOR
元件分類： 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)： 4/24頁(yè)
文件大小： 301K
代理商： DS1678
DS1678
12 of 24
With the DIS0 bit set to a zero and the DIS1 bit set to a one, the ETC will increment every time the
Single Minutes byte in the RTC is incremented. This will give a medium resolution between events, but
will increase the largest possible interval between events that can be accurately measured without using
additional memory space and reducing the total number of events able to be logged to 65,535 minutes or
about 45.5 days. If the maximum time between events could be greater than 45.5 days, you should
consider using one of the courser resolutions to conserve memory.
With both of the DISx bits set to a one, the ETC will increment every time the Single Hours byte in the
RTC is incremented. This will give the lowest resolution between events, but will increase the largest
possible interval between events that can be accurately measured without using additional memory space
and reducing the total number of events able to be logged to 65,535 hours or about 7.5 years.
In the event that a second event occurs before the ETC is able to increment for the first time, all zeros
will be logged in the Event Log memory and the ETC will be reset. If this occurs, the time base will
remain correct since it is based on the separate RTC incrementing, but the exact time of the event will be
no more accurate than the size of the time increment that is chosen. For this reason, it is recommended to
use the finest resolution possible for your logging to minimize the errors. If the normal duration between
events is several days or months, then a few minutes or an hour may not be significant to your data
accuracy.
As an example, an event occurs after 28h hours which causes the ETC to be reset. The ETC is set to
increment on the hour, but the next event happens after 45 minutes. The value recorded in the Event Log
memory is 00h, the Event Counter is incremented, and the ETC is cleared to begin counting for the next
event. That next event happens 20 minutes later, but the value in the ETC is 01h because the RTC
incremented the ETC on the hour, which was 15 minutes after the last event was recorded in the Event
Log memory. We now know that in the course of about an hour three events took place. If this is
normal, then we should have chosen a finer resolution, but this does sometimes happen, even when
events are normally spread widely apart. We did not loose any data in our example because we know in
which hour the events took place and when we chose the resolution, we decided that knowing which hour
was accurate enough for our needs. The RTC maintained the correct time base, even though the ETC
was cleared before it was incremented even once for the second event in our example. The third event
incremented after only 15 minutes, but relative to the first event in our example, this was correct because
the second event occurred after 45 minutes and the third event was incremented after and additional
15 minutes, which makes our hour.
DURATION INTERVAL SELECT BITS Table 2
DIS1
DIS0
Elapsed Time Count Resolution
Max. Time Between Events
0
Alarm Interrupt Output Enabled
0
1
The Counter will Increment Every Second
18.2 Hours
1
0
The Counter will Increment Every Minute
45.5 Days
1
The Counter will Increment Every Hour
7.5 Years
RO - Roll-Over - This bit determines whether the datalog function of the DS1678 rolls over or stops
writing data to the Event Log Memory if the Event Log Memory is completely filled. If RO is set to a 1,
the Event Log memory will “roll over” after all 2048 bytes in the Event Log memory have been used. In
other words, after the 1024th event recorded in the Event Log memory, the following sample will have
the full time/date stamp information written to the Start Time Stamp register and the contents of the ETC
written to the two byte following the Start Time Stamp (Event 0 Elapsed Time From Last Event) and the
next sample will have the duration of time from the new Start Time Stamp value written to Event Log
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: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: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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