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参数资料
| 型号： | DS1308U-3+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC RTC 56BYTE NVRAM I2C 8UMAX |
| 标准包装： | 50 |
| 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： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
DS1308
Low-Current I2C RTC with 56-Byte NV RAM
8
Maxim Integrated
Functional Diagram
Detailed Description
The DS1308 serial RTC is a low-power, full BCD clock/
calendar plus 56 bytes of NV SRAM. Address and data
are transferred serially through an I2C interface. The
clock/calendar provides seconds, minutes, hours, day,
date, month, and year information. The end of the month
date is automatically adjusted for months with fewer than
31 days, including corrections for leap year. The clock
operates in either the 24-hour or 12-hour format with an
AM/PM indicator. The DS1308 has a built-in power-sense
circuit that detects power failures and automatically
switches to the VBAT supply.
Operation
The DS1308 operates as a slave device on the serial bus.
Access is obtained by implementing a START condition
and providing a device identification code, followed by
data. Subsequent registers can be accessed sequen-
tially until a STOP condition is executed. The device is
fully accessible and data can be written and read when
VCC is greater than VPF. However, when VCC falls below
VPF, the internal clock registers are blocked from any
access. If VBAT is greater than VCC, the device power is
switched from VCC to VBAT when VCC drops below VPF.
If VBAT is less than VPF, the device power is switched
from VCC to VBAT when VCC drops below VBAT. The
oscillator and timekeeping functions are maintained
from the VBAT source until VCC returns above VPF, read
Diagram shows the main elements of the DS1308.
An enable bit in the seconds register (CH) controls the
oscillator. Oscillator startup times are highly dependent
upon crystal characteristics, PCB leakage, and layout.
High ESR and excessive capacitive loads are the major
contributors to long startup times. A circuit using a crystal
with the recommended characteristics and proper layout
usually starts within 1 second.
On the first application of power to the device, the time
and date registers are reset to 01/01/00 01 00:00:00 (DD/
MM/YY DOW HH:MM:SS), and CH bit in the seconds
register is set to 0.
DS1308
N
/4
/32
EXTSYNC
CONTROL LOGIC
OSC-1Hz
POWER CONTROL
RAM
CLOCK AND
CALENDAR REGISTERS
/2
128Hz
OSC-1Hz
SQW/CLKIN
X1
X2
SCL
SDA
4.096kHz
8.192kHz
32.768kHz
MUX/
BUFFER
DIVIDER
EXT-1Hz
SERIAL BUS
INTERFACE AND
ADDRESS
REGISTER
VCC
VBAT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1308U-3+ | 功能描述:实时时钟 LOW CUR 3V 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-3+T | 功能描述:实时时钟 LOW CUR 3V 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-33 | 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 |
| DS1308U-33+ | 功能描述:实时时钟 LOW CUR 3.3V 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-33+T | 功能描述:实时时钟 LOW CUR 3.3V 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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