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参数资料
| 型号： | DS1682 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 0 TIMER(S), TIME RECORDER, PDSO8 |
| 封装： | MICRO, SOP-8 |
| 文件页数： | 9/13页 |
| 文件大小： | 77K |
| 代理商： | DS1682 |
DS1682
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DATA LOGGING
When the DS1682 is powered-up, the contents of the Total Time Accumulate register (TTA) are
downloaded to the ETC and the device begins looking for events that trigger the Event input. When an
event triggers the input by transitioning to a high level input, the ETC begins incrementing in quarter
second resolution. When the Event input falls below 0.5*VCC to indicate the end of an Event, a power
failure, or power-down, the contents of the ETC are stored to the non-volatile Total Time Accumulator
register, the Event Counter register is incremented and the ETC is prepared for the next event. There is a
built in pull-down on the Event input to prevent power-up glitches from triggering a false event. As the
ETC is being incremented, there is a non-zero value in the ATP register and the AoR bit in the
Configuration register is set to a 0, the DS1682 will compare the value in the ETC to the value in the
Alarm Trip Point register to see when the value in the ETC is equal to or greater than the value in the
Alarm Trip Point register. When the value in the ETC exceeds the value in the Alarm Trip Point register,
the Alarm# output is enabled/disabled depending on the value of the Polarity bit.
The ETC will not roll over to 0000h once FFFFh is reached. The DS1682 will stop counting time once
FFFFh is reached. This should take approximately 34 years with the event pin pulled high. When the
Event pin is transitioned, the 2-wire bus is not available for communications for 200 mS.
CLOCK
The clock circuitry consists of a calibrated, temperature compensated RC time base and a 32-bit Elapsed
Time Counter (ETC) which increments on the quarter second. The total time of all events is stored in the
non-volatile Total Time Accumulator register. As the ETC is being incremented and there is a non-zero
value in the ATP register and the AoR bit in the Configuration register is set to a 0, the DS1682 will
compare the value in the ETC to the value in the Alarm Trip Point register to see when the value in the
ETC is equal to or greater than the value in the Alarm Trip Point register. When the value in the ETC
exceeds the value in the Alarm Trip Point register, the Alarm# output is enabled/disabled depending on
the value of the Polarity bit.
TOTAL TIME ACCUMULATOR REGISTER
The Total Time Accumulator register is an EEPROM based 32 bit register that holds the total “ON” time
of all events up to a total of about 34 years worth of event time. This value is not erasable when the Reset
Enable and AoR bits in the Configuration register are set to a zero and does not require a power source to
insure the data’s integrity.
This register can only be cleared when the Reset Enable bit in the
Configuration register is set to a one or the AoR bit is set to a 1 with the Alarm# pin held high, and the
Reset command is sent via the 2-wire bus. A capacitor or other temporary energy source may be required
to hold the Voltage 150 mS after the event has completed if the system power is removed at the same
time as the event ends in order to allow the contents of the ETC to be stored properly. With less than the
150 mS of power after the end of the event, the data may be lost. The LSB is written first to be sure that
the most likely changed data is saved first.
ALARM TRIP POINT REGISTER
The Alarm Trip Point register (ATP) is a 32-bit register that holds the time value in quarter seconds that
is set by the user via the 2-wire bus to enable/disable the Alarm# output when the value is equal to or
greater than the value in the ETC.
EVENT COUNTER REGISTER
This 17-bit register set provides the total number of data samples that have been logged during the life of
the product up to 131,072 separate events. The Event Counter consists of 2-bytes of memory in the
memory map and the MSb being the Event Roll Over flag in the Configuration Register. The Event Roll
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| DS1685S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685E-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1682_13 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Total-Elapsed-Time Recorder with Alarm |
| DS1682S | 功能描述:实时时钟 Total-Elapsed-Time Recorder w/Alarm 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 |
| DS1682S/GG8 | 制造商:Maxim Integrated Products 功能描述: |
| DS1682S/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10BYTE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC TIMEKEEPER ALARM ELAPSE 8SOIC |
| DS1682S/T&R | 功能描述:实时时钟 Total-Elapsed-Time Recorder w/Alarm 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 |
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