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參數(shù)資料
| 型號： | DS1339 |
| 英文描述： | Serial Real-Time Clock |
| 中文描述： | I²C串行實時時鐘 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 279K |
| 代理商： | DS1339 |
DS1339 I
2
C Serial Real-Time Clock
12 of 18
Table 2. Alarm Mask Bits
ALARM 1 REGISTER MASK BITS
(Bit 7)
A1M4
A1M3
1
1
1
1
1
1
1
0
DY/
DT
A1M2
1
1
0
0
A1M1
1
0
0
0
ALARM RATE
X
X
X
X
Alarm once per second
Alarm when seconds match
Alarm when minutes and seconds match
Alarm when hours, minutes, and seconds match
Alarm when date, hours, minutes, and seconds
match
Alarm when day, hours, minutes, and seconds match
0
0
0
0
0
1
0
0
0
0
ALARM 2 REGISTER MASK BITS
(Bit 7)
A2M4
A2M3
1
1
1
1
1
0
0
0
0
0
DY/
DT
A2M2
1
0
0
0
0
ALARM RATE
X
X
X
0
1
Alarm once per minute (00 sec. of every min.)
Alarm when minutes match
Alarm when hours and minutes match
Alarm when date, hours, and minutes match
Alarm when day, hours, and minutes match
SPECIAL-PURPOSE REGISTERS
The DS1339 has two additional registers (control and status) that control the RTC, alarms, and square-wave
output.
CONTROL REGISTER (0Eh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
EOSC
0
BBSQI
RS2
RS1
INTCN
A2IE
A1IE
Bit 7: Enable Oscillator
the oscillator is stopped. This bit is enabled (logic 0) when power is first applied.
Bit 5: Battery-Backed Square-Wave and Interrupt Enable (BBSQI).
This bit when set to a logic 1 enables the
square wave or interrupt output when V
CC
is absent and the DS1339 is being powered by the V
BACKUP
pin. When
BBSQI is a logic 0, the SQW/
INT
pin goes high impedance when V
CC
falls below the power-fail trip point. This bit is
disabled (logic 0) when power is first applied.
Bits 4 and 3: Rate Select (RS2 and RS1).
These bits control the frequency of the square-wave output when the
square wave has been enabled. The table below shows the square-wave frequencies that can be selected with the
RS bits. These bits are both set to logic 1 (32kHz) when power is first applied.
(EOSC).
This bit when set to logic 0 starts the oscillator. When this bit is set to a logic 1,
Square-Wave Output Frequency
RS2
RS1
SQUARE-WAVE
OUTPUT
FREQUENCY
1Hz
4.096kHz
8.192kHz
32.768kHz
0
0
1
1
0
1
0
1
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| DS1339U-2 | Serial Real-Time Clock |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1339_06 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C Serial Real-Time Clock |
| DS1339_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C Serial Real-Time Clock Trickle-Charge Capability |
| DS1339A | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339A_13 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339AD+ | 功能描述:實時時鐘 1.8-3.3V Serial 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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