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參數(shù)資料
| 型號(hào)： | DS1689 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封裝： | 0.600 INCH, DIP-28 |
| 文件頁數(shù)： | 3/32頁 |
| 文件大小： | 376K |
| 代理商： | DS1689 |
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DS1689/DS1693
11 of 32
PERIODIC INTERRUPT RATE AND
SQUARE WAVE OUTPUT FREQUENCY Table 2
EXT. REG. B
SELECT BITS REGISTER A
E32K
RS3
RS2
RS1
RS0
tPI PERIODIC
INTERRUPT RATE
SQW OUTPUT
FREQUENCY
0
None
0
1
3.90625 ms
256 Hz
0
1
0
7.8125 ms
128 Hz
0
1
122.070
s
8.192 kHz
0
1
0
244.141
s
4.096 kHz
0
1
0
1
488.281
s
2.048 kHz
0
1
0
976.5625
s
1.024 kHz
0
1
1.953125 ms
512 Hz
0
1
0
3.90625 ms
256 Hz
0
1
0
1
7.8125 ms
128 Hz
0
1
0
1
0
15.625 ms
64 Hz
0
1
0
1
31.25 ms
32 Hz
0
1
0
62.5 ms
16 Hz
0
1
0
1
125 ms
8 Hz
0
1
0
250 ms
4 Hz
0
1
500 ms
2 Hz
1
X
*
32.768 kHz
*RS3-RS0 determine periodic interrupt rates as listed for E32K=0.
The third method uses a periodic interrupt to determine if an update cycle is in progress. The UIP bit in
Register A is set high between the setting of the PF bit in Register C (see Figure 3). Periodic interrupts
that occur at a rate of greater than tBUC allow valid time and date information to be reached at each
occurrence of the periodic interrupt. The reads should be complete within (tPI / 2+tBUC) to ensure that data
is not read during the update cycle.
UPDATE-ENDED AND PERIODIC INTERRUPT RELATIONSHIP Figure 3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1689_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689S | 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 |
| DS1689S/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689S/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689S/T&R | 制造商:Rochester Electronics LLC 功能描述: |
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