參數(shù)資料
型號(hào)： DS12B887
英文描述： Real Time Clock
中文描述： 實(shí)時(shí)時(shí)鐘
文件頁數(shù)： 3/16頁
文件大小： 102K
代理商： DS12B887
DS12B887
080895 3/16
SIGNAL DESCRIPTIONS
GND, V
CC
- DC power is provided to the device on these
pins. V
CC
is the +5 volt input. When 5 volts are applied
within normal limits, the device is fully accessible and
data can be written and read. When V
CC
is below 4.25
volts typical, reads and writes are inhibited. However,
the timekeeping function continues unaffected by the
lower input voltage. As V
CC
falls below 3 volts typical,
the RAM and timekeeper are switched over to an inter-
nal lithium energy source. The timekeeping function
maintains an accuracy of
±
1 minute per month at 25
o
C
regardless of the voltage input on the V
CC
pin.
SQW (Square Wave Output) - The SQW pin can output
a signal from one of 13 taps provided by the 15 internal
divider stages of the Real Time Clock. The frequency of
the SQW pin can be changed by programming Register
A as shown in Table 1. The SQW signal can be turned
on and off using the SQWE bit in Register B. The SQW
signal is not available when V
CC
is less than 4.25 volts
typical.
PERIODIC INTERRUPT RATE AND SQUARE WAVE OUTPUT FREQUENCY
Table 1
SELECT BITS REGISTER A
t
PERIODIC
INTERRUPT RATE
SQW OUTPUT
FREQUENCY
RS3
RS2
RS1
RS0
0
0
0
0
None
None
0
0
0
1
3.90625 ms
256 Hz
0
0
1
0
7.8125 ms
128 Hz
0
0
1
1
122.070
s
8.192 kHz
0
1
0
0
244.141
s
4.096 kHz
0
1
0
1
488.281
s
2.048 kHz
0
1
1
0
976.5625
s
1.024 kHz
0
1
1
1
1.953125 ms
512 Hz
1
0
0
0
3.90625 ms
256 Hz
1
0
0
1
7.8125 ms
128 Hz
1
0
1
0
15.625 ms
64 Hz
1
0
1
1
31.25 ms
32 Hz
1
1
0
0
62.5 ms
16 Hz
1
1
0
1
125 ms
8 Hz
1
1
1
0
250 ms
4 Hz
1
1
1
1
500 ms
2 Hz
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS12C887 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
DS12C887+ 功能描述:實(shí)時(shí)時(shí)鐘 RTC 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
DS12C887A 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
DS12C887A+ 功能描述:實(shí)時(shí)時(shí)鐘 RTC 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
DS12CR887-33 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
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