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| 型号： | DS1339AD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/19页 |
| 文件大小： | 0K |
| 描述： | IC RTC I2C W/ALARM 8TDFN-EP |
| 标准包装： | 3,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，涓流充电器 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.71 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
DS1339A
Low-Current, I2C, Serial Real-Time Clock
11
Maxim Integrated
Alarms
The DS1339A contains two time of day/date alarms.
Alarm 1 can be set by writing to registers 07h to 0Ah.
Alarm 2 can be set by writing to registers 0Bh to 0Dh.
The alarms can be programmed (by the Alarm Enable
and INTCN bits of the Control Register) to activate the
SQW/INT output on an alarm match condition. Bit 7 of
each of the time of day/date alarm registers are mask
bits (Table 4). When all the mask bits for each alarm
are logic 0, an alarm only occurs when the values in the
timekeeping registers 00h to 06h match the values stored
in the time of day/date alarm registers. The alarms can
also be programmed to repeat every second, minute,
hour, day, or date. Table 4 shows the possible settings.
Configurations not listed in the table result in illogical
operation.
The DY/DT bits (bit 6 of the alarm day/date registers)
control whether the alarm value stored in bits 0 to 5 of
that register reflects the day of the week or the date of
the month. If DY/DT is written to a logic 0, the alarm is
the result of a match with date of the month. If DY/DT is
written to a logic 1, the alarm is the result of a match with
day of the week.
The device checks for an alarm match once per second.
When the RTC register values match alarm register
settings, the corresponding Alarm Flag ‘A1F’ or ‘A2F’
bit is set to logic 1. If the corresponding Alarm Interrupt
Enable ‘A1IE’ or ‘A2IE’ is also set to logic 1 and the
INTCN bit is set to logic 1, the alarm condition activates
the SQW/INT signal. If the BBSQI bit is set to 1, the INT
output activates while the part is being powered by
VBACKUP. The alarm output remains active until the alarm
flag is cleared by the user.
Table 4. Alarm Mask Bits
DY/DT
ALARM1 REGISTER MASK BITS (BIT 7)
ALARM RATE
A1M4
A1M3
A1M2
A1M1
X
1
Alarm once per second
X
1
0
Alarm when seconds match
X
1
0
Alarm when minutes and seconds match
X
1
0
Alarm when hours, minutes, and seconds match
0
Alarm when date, hours, minutes, and seconds match
1
0
Alarm when day, hours, minutes, and seconds match
DY/DT
ALARM2 REGISTER MASK BITS (BIT 7)
ALARM RATE
A2M4
A2M3
A2M2
X
1
Alarm once per minute (00 sec. of every minute)
X
1
0
Alarm when minutes match
X
1
0
Alarm when hours and minutes match
0
Alarm when date, hours, and minutes match
1
0
Alarm when day, hours, and minutes match
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1339AU | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339AU+ | 功能描述:实时时钟 1.8-3.3V Serial RTC 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 |
| DS1339AU+T | 功能描述:实时时钟 1.8-3.3V Serial RTC 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 |
| DS1339BU+ | 功能描述:实时时钟 SERIAL RTC 1.8-3.3V C 1.8-3.3V HESR USOP 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 |
| DS1339BU+T | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC 1.8-3.3V HESR USOP TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/ALARM 8UMAX |
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