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参数资料
| 型号： | DS1678K |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/25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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DETAILED DESCRIPTION
The Event Counter Register contains the total number of events that have been logged in the current
event-logging mission. The Event Counter Register also allows the user to determine if the data in the
event-log memory has rolled over.
The 16-bit ETC can be incremented once per second, once per minute, or once per hour. Each event
transfers the current ETC value into the event-log memory, then clears and restarts the ETC. The three
increment periods allow users to maximize the resolution while providing an adequate maximum time
between events. The seconds resolution provides the time of an event down to the second, while allowing
up to 65,535 seconds (18.2 hours) between events without using additional event-log memory. The
minutes resolution provides the time of an event down to the minute, while allowing up to 45.5 days
between events without using extra memory locations. The hours resolution provides the time of an event
down to the hour in which it occurred, while allowing up to 7.5 years between events without using
additional event-log memory. Based on the expected frequency of events, an increment period can be
selected to maximize the resolution while minimizing use of the event-log memory.
The event can be triggered in three different ways depending on how the user programs the trigger select
(TRx) bits in the Control Register. The event can be triggered by a falling edge on the
INT pin only, a
rising edge only, or it can be triggered by rising and falling edges. Triggering with both the rising and
falling edges allows for monitoring when something is turned on/off and how long it is in either state.
The RTC provides seconds, minutes, hours, day, date, month, and year information with leap-year
compensation, and year 2000 compliance. The RTC also provides an alarm interrupt. The I2C interface
allows the RTC to function as a stand-alone RTC in the system.
The programmable alarm trip points in the RTC allow a flag to be set in the Control Register when the
specified time in the Alarm Trip Point Register is reached. The flag is readable via the I2C interface
during an event-logging mission or, when the DS1678 is not in a mission,
INT becomes an output and
generates an alarm interrupt if the value in the RTC equals the value in the RTC Alarm Register and the
duration interval select (DISx) bits are both set to zeros.
The DS1678 operates as a slave device on the I2C serial bus. Access is obtained by generating a START
condition and providing a device identification code. All data is transferred to and from the DS1678 most
significant bit (MSB) first. The address counter automatically increments so that subsequent registers can
be accessed sequentially until a STOP condition is executed. When VCC falls below 1.25 x VBAT, the
device automatically write protects itself by disabling the I2C interface, terminates any access in progress,
and resets the device address counter. Inputs to the device via the I2C bus are not recognized at this time
in order to prevent erroneous data from being written to the device from an out-of-tolerance system.
When VCC falls below VBAT, the device switches into a low-current battery-backup mode. Upon power-
up, the device switches from battery power to VCC when VCC is greater than VBAT + 0.2V, and recognizes
inputs from the system when VCC is greater than 1.25 x VBAT by releasing control of the write protection
on the I2C bus.
The Block Diagram shows the main elements of the RTC event recorder. The device has four major
components: a 64-bit RTC and control block, 32-byte user NV RAM, 2048 bytes of event-log memory
(1024 events), and an I2C serial interface.
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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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