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參數(shù)資料
| 型號： | DS14285Q |
| 英文描述： | Real Time Clock with NV RAM Control |
| 中文描述： | 實(shí)時時鐘的非易失RAM控制 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 303K |
| 代理商： | DS14285Q |
DS14285/DS14287
9 of 25
and alarm bytes are always accessible because they are double buffered. Once per second the 10 bytes are
advanced by 1 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 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 3 alarm bytes. The “don’t care” code is any hexadecimal value from C0 to FF. The 2 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 alarm bytes
create an interrupt every second.
TIME, CALENDAR AND ALARM DATA MODES
Table 1
ADDRESS
LOCATION
0
Seconds
1
Seconds Alarm
2
Minutes
3
Minutes Alarm
Hours-12-hr Mode
4
Hours-24-hr Mode
Hours Alarm-12-hr
5
Hours Alarm-24-hr
6
Day of the Week
Sunday = 1
7
Date of the Month
8
Month
9
Year
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
01-12AM, 81-92PM
00-23
01-12AM, 81-92PM
00-23
01-07
1-31
1-12
0-99
01-1F
01-0C
00-63
01-31
01-12
00-99
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS14285QN | Real Time Clock with NV RAM Control |
| DS14285S | Real Time Clock with NV RAM Control |
| DS14285SN | Real Time Clock with NV RAM Control |
| DS1490F | 2-in-1 Fob |
| DS1602 | Elapsed Time Counter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS14285Q+ | 功能描述:實(shí)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 |
| DS14285QN | 功能描述:實(shí)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 |
| DS14285QN+ | 功能描述:實(shí)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 |
| DS14285S | 功能描述:實(shí)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 |
| DS14285S/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC |
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