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参数资料
| 型号： | DS14285QN |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 25/25页 |
| 文件大小： | 303K |
| 代理商： | DS14285QN |
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
RANGE
ADDRESS
LOCATION
FUNCTION
DECIMAL
RANGE
BINARY DATA MODE
BCD DATA MODE
0
Seconds
0-59
00-3B
00-59
1
Seconds Alarm
0-59
00-3B
00-59
2
Minutes
0-59
00-3B
00-59
3
Minutes Alarm
0-59
00-3B
00-59
Hours-12-hr Mode
1-12
01-0C AM, 81-8C PM
01-12AM, 81-92PM
4
Hours-24-hr Mode
0-23
00-17
00-23
Hours Alarm-12-hr
1-12
01-0C AM, 81-8C PM
01-12AM, 81-92PM
5
Hours Alarm-24-hr
0-23
00-17
00-23
6
Day of the Week
Sunday = 1
1-7
01-07
7
Date of the Month
1-31
01-1F
01-31
8
Month
1-12
01-0C
01-12
9
Year
0-99
00-63
00-99
相关PDF资料 |
PDF描述 |
|---|---|
| DS14285S | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS14285N | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS14285SN | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS14285Q | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS14285 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS14285QN+ | 功能描述:实时时钟 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 |
| DS14285S | 功能描述:实时时钟 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 |
| DS14285S/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC |
| DS14285S/T&R | 功能描述:实时时钟 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 |
| DS14285S/TR | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM |
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