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參數(shù)資料
| 型號： | DS17887-5 |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 8/38頁 |
| 文件大?。?/td> | 515K |
| 代理商： | DS17887-5 |
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DS17885/DS17887
8 of 38
PM when it is a logic 1. The time, calendar, and alarm bytes are always accessible because they are
double buffered. Once per second the 10 bytes are advanced by one second and checked for an alarm
condition. If a read of the time and calendar data occurs during an update, a problem exists where
seconds, minutes, hours, etc. may not correlate. The probability of reading incorrect time and calendar
data is low. Several methods of avoiding any possible incorrect time and calendar reads are covered later
in this text.
The three time alarm bytes can be used in two ways. First, when the alarm time is written in the
appropriate hours, minutes, and seconds alarm locations, the alarm interrupt is initiated at the specified
time each day if the alarm enable bit is high. The second use condition is to insert a “don’t care” state in
one or more of the three time alarm bytes. The “don’t care” code is any hexadecimal value from C0 to
FF. The two most significant bits of each byte set the “don’t care” condition when at logic 1. An alarm
will be generated each hour when the “don’t care” bits are set in the hours byte. Similarly, an alarm is
generated every minute with “don’t care” codes in the hours and minute alarm bytes. The “don’t care”
codes in all three time alarm bytes create an interrupt every second. The three time alarm bytes may be
used in conjunction with the date alarm as described in the Wake-up/Kickstart section. The century
counter will be discussed later in this text.
TIME, CALENDAR AND ALARM DATA MODES
Table 1
ADDRESS
LOCATION
OOH
Seconds
01H
Seconds Alarm
02H
Minutes
03H
Minutes Alarm
Hours 12-hr, Mode
04H
Hours 24-hr, Mode
Hours Alarm 12-hr, Mode
05H
Hours Alarm 24-hr, Mode
06H
Days of the week
Sunday=1
07H
Date of Month
08H
Month
09H
Year
BANK 1, 48H
Century
BANK 1, 49H
Date Alarm
RANGE
FUNCTION
DECIMAL
RANGE
0-59
0-59
0-59
0-59
1-12
0-23
1-12
0-23
1-7
BINARY DATA MODE
00-3B
00-3B
00-3B
00-3B
01-0C AM, 81-8C PM
00-17
01-0C AM, 81-8C PM
00-17
01-07
BCD DATA MODE
00-59
00-59
00-59
00-59
01-12 AM, 81-92 PM
00-23
01-12 AM, 81-92 PM
00-23
01-07
1-31
1-12
0-99
0-99
1-31
01-1F
01-0C
00-63
00-63
01-1F
01-31
01-12
00-99
00-99
01-31
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17887-5 IND | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS17887-5+ | 功能描述:實時時鐘 3V/5V 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS17887-5IND | 功能描述:IC RTC 5V 8K NV RAM 24-EDIP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
| DS17887-5IND+ | 功能描述:實時時鐘 3V/5V 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS17H531D | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3-PHASE STEPPING SYSTEMS |
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