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参数资料
| 型号： | DS1678K |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL RT EVENT RECORD DS1678 |
| 标准包装： | 1 |
DS1678 Real-Time Event Recorder
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Bit 3: Rollover (RO). This bit determines whether the data log 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 one, the
event-log memory rolls over after all 2048 bytes in the event-log memory have been used. After the
1024th event recorded in the event-log memory, the following sample has the full time/date stamp
information written to the Start Time Stamp register and the contents of the ETC written to the two bytes
following the start time stamp (Event 0 Rollover Stamp). The next sample has the duration of time from
the new start time stamp value written to event-log memory address locations 0000h and 0001h,
overwriting the original data. Likewise, subsequent samples increment through the event-log registers,
overwriting their data.
The Event 0 Rollover Stamp has the elapsed time since the last event in the event-log memory. This is to
allow the user to recover the information prior to the rollover. At the start of a mission, the value in these
two bytes is zero since there was no previous event from which to have an elapsed time.
If RO is set to zero, no further event logs are written to the event-log memory after all event-log memory
registers have been filled. However, events continue to be recognized, and the Event Counter Register is
incremented for each event.
Bits 2 and 1: Trigger Sel ect 0 and 1 (TR1 and TR0). These bits select the edge(s) that activate INT to
cause an event to be logged. An event can be triggered one of three ways, depending on the settings of the
TRx bits in the Control Register. With TR0 set to one and TR1 set to zero,
INT is activated on the falling
edge of the input signal. With TR0 set to zero and TR1 set to one, the
INT is activated on the rising edge
of the input signal.
With TR0 and TR1 set to zero,
INT is activated by the rising and falling edges to allow for the
measurement and duration of on/off type events. If TR0 and TR1 are set to zero, nothing happens when
INT is toggled, and a mission does not start. This is an illegal state, and the mission does not start without
a valid value in the TRx bits prior to attempting to start the mission.
Table 6. Trigger Select Bits
TR1 TR0
EDGE(S) USED TO
TRIGGER AN EVENT
0
Nothing, Illegal State
0
1
Falling Edge
1
0
Rising Edge
1
Both Rising and Falling Edges
Bit 0: Enable Oscillator (EOSC). This bit allows the clock oscillator to shut off to save power. The RTC
no longer keeps time when the oscillator is shut off, but the information stored in the device memory is
maintained. An event-log mission cannot start with EOSC set to zero, and the RTC must be reset to the
correct value after the oscillator is restarted and prior to starting a mission to obtain good data. A clear
memory also cannot be executed without the oscillator running. When VCC > VBAT, the oscillator
automatically starts, no matter what the value in the EOSC bit, to allow proper communications.
Disabling the oscillator with EOSC can be used to extend the battery life whenever time and date
operation on battery backup is not required.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1678S | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1678S/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 32BYTE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RECORDER REALTIME EVENT 8SOIC |
| DS1678S/T&R | 功能描述:IC RECORDER REALTIME EVENT 8SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1678S+ | 功能描述:实时时钟 Real-Time Event Recorder RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1678S+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 32BYTE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC REAL TIME EVENT REC 8-SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock Real-Time Event Recorder |
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