参数资料
| 型号： | DS1307Z/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC RTC SERIAL 512K 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM，方波输出 |
| 存储容量： | 56B |
| 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： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1307 64 x 8, Serial, I2C Real-Time Clock
8 of 14
CLOCK AND CALENDAR
The time and calendar information is obtained by reading the appropriate register bytes. Table 2 shows the RTC
registers. The time and calendar are set or initialized by writing the appropriate register bytes. The contents of the
time and calendar registers are in the BCD format. The day-of-week register increments at midnight. Values that
correspond to the day of week are user-defined but must be sequential (i.e., if 1 equals Sunday, then 2 equals
Monday, and so on.) Illogical time and date entries result in undefined operation. Bit 7 of Register 0 is the clock halt
(CH) bit. When this bit is set to 1, the oscillator is disabled. When cleared to 0, the oscillator is enabled. On first
application of power to the device the time and date registers are typically reset to 01/01/00 01 00:00:00
(MM/DD/YY DOW HH:MM:SS). The CH bit in the seconds register will be set to a 1. The clock can be halted
whenever the timekeeping functions are not required, which minimizes current (IBATDR).
The DS1307 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12-hour or
24-hour mode-select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit with
logic high being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20 to 23 hours). The hours value must be
re-entered whenever the 12/24-hour mode bit is changed.
When reading or writing the time and date registers, secondary (user) buffers are used to prevent errors when the
internal registers update. When reading the time and date registers, the user buffers are synchronized to the
internal registers on any I2C START. The time information is read from these secondary registers while the clock
continues to run. This eliminates the need to re-read the registers in case the internal registers update during a
read. The divider chain is reset whenever the seconds register is written. Write transfers occur on the I2C
acknowledge from the DS1307. Once the divider chain is reset, to avoid rollover issues, the remaining time and
date registers must be written within one second.
Table 2. Timekeeper Registers
ADDRESS BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
RANGE
00h
CH
10 Seconds
Seconds
00–59
01h
0
10 Minutes
Minutes
00–59
02h
0
12
10
Hour
10
Hour
Hours
1–12
+AM/PM
00–23
24
PM/
AM
03h
0
DAY
Day
01–07
04h
0
10 Date
Date
01–31
05h
0
10
Month
01–12
06h
10 Year
Year
00–99
07h
OUT
0
SQWE
0
RS1
RS0
Control
—
08h–3Fh
RAM
56 x 8
00h–FFh
0 = Always reads back as 0.
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| DS1308 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Current I2C RTC with 56-Byte NV RAM |
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| DS1308U-18+ | 功能描述:实时时钟 LOW CUR 1.8V I2C 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 |
| DS1308U-18+T | 功能描述:实时时钟 LOW CUR 1.8V I2C 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 |
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