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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 301K |
| 代理商： | DS1678 |
DS1678
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ME bit in the Control register once any events that are being recorded have completed. The value in the
MIP and ME bits will remain a 1 until the mission has completed, even if they are written to a 0. Upon
initiation of an event log mission by either method, the DS1678 will set the Mission-in-Progress (MIP)
bit in the Control register to a one.
It should be noted that the MEM CLR bit of the Status register must be a one in order to start an event
log mission. This means that the Event Log memory, the Event Count, Elapsed Time Counter, Address
Pointer, and Start Time Stamp registers are cleared of data (all zero’s) so that an end user can not turn the
logger on and off to avoid recording events. Once the mission is stopped, the memory must be cleared in
order to start a new mission.
The time at which the first event log sample is measured is dependent upon the way the mission is
started. The first way to start a mission is with a delayed start by writing a 1 to the ME bit. The ME bit
will only be able to be written to a 1 if the MEM CLR bit is set to a 1. The mission will have a delayed
start until the first event occurs by activating the INT pin. If the mission starts because the ME bit is set
to a one and the INT pin is activated, the MIP bit in the Status register is set to a one, the current
Time/Date is written to the Start Time Stamp register, the Event 0 Elapsed Time From Last Event bytes
in the Time/Date Stamp are both written with zero’s, the Event Count register will be incremented and
the elapsed time counter will start incrementing based on the settings in the DISx bits of the Control
register. Subsequent events will be logged as the duration of time from the previous event by writing the
contents of the Elapsed Time Counter into the Event Log memory when that subsequent event is
triggered by the INT pin being activated.
The second way to start a mission is write a 1 to the MIP bit of the Status register over the 2-wire
interface which will automatically write a 1 to the ME bit of the Control register. This start mission
command will be ignored and no action taken if the MEM CLR bit is not set to a 1. When the MIP bit is
written to a 1 and the ME bit is set to a 1, the mission is started by loading the current Time/Date into the
Start Time Stamp, the Event 0 Elapsed Time From Last Event bytes in the Time/Date Stamp are both
written with zero’s, the Event Count register will be incremented and the elapsed time counter will start
incrementing based on the settings in the DISx bits of the Control register. The first event will then be
logged as the duration of time since the start time. All subsequent events will then be logged as the
duration of time since the previous event.
The user has two options for dealing with the potential occurrence of a data overrun (i.e., more than 1024
total event logs in the Event Log Memory) (See Figure 8). The first option is to enable the rollover
feature of the DS1678. This is accomplished by setting the Rollover bit (bit 3 of the Control register) to
1. When the Rollover feature is enabled, new data is written over previous data, starting with the Start
Time Stamp Register as if a new mission is starting.
The one difference with a time/date stamp from a rollover compared to a new mission start is that the two
bytes after the time/date stamp, Event 0 Elapsed Time From Last Event, will have the elapsed time since
event 1024 of the Event Log memory. This is to allow the user to recover the information recorded prior
to the rollover. At the start of a mission, the value in these two bytes will be all zeros since there was no
previous event to have an elapsed time from.
The next event will have its elapsed time since the new time/date stamp recorded in Event Log Memory
locations 0000h and 0001h as before. For example, if the Event Log memory has been completely filled
(i.e., 1024 event logs have been recorded in the Event Log memory) the next event will cause a new
Time/Date stamp to be written to the Start Time Stamp register and the elapsed time since event 1024
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)時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 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)時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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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