参数资料
| 型号： | DS1339AU+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/19页 |
| 文件大小： | 0K |
| 描述： | IC RTC I2C W/ALARM 8USOP |
| 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： | 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： | 带卷 (TR) |
DS1339A
Low-Current, I2C, Serial Real-Time Clock
8
Maxim Integrated
Detailed Description
The DS1339A serial real-time clock (RTC) is a low-
power clock/date device with two programmable time-
of-day alarms and a programmable square-wave output.
Address and data are transferred serially through an I2C
bus. The clock/date provides seconds, minutes, hours,
day, date, month, and year information. The date at the
end of the month 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 AM/PM indicator. The DS1339A has a built-
in power-sense circuit that detects power failures and
automatically switches to the backup supply, maintaining
time, date, and alarm operation.
Operation
The DS1339A 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
sequentially 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 VPF is less than VBACKUP, the device
power is switched from VCC to VBACKUP when VCC
drops below VPF. If VPF is greater than VBACKUP, the
device power is switched from VCC to VBACKUP when
VCC drops below VBACKUP. The registers are maintained
from the VBACKUP source until VCC is returned to nominal
levels. The Functional Diagram shows the main elements
of the serial real-time clock.
Power Control
The power-control function is provided by a precise,
temperature-compensated voltage reference and a
comparator circuit that monitors the VCC level. 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 VPF is less than VBACKUP, the device
power is switched from VCC to VBACKUP when VCC
drops below VPF. If VPF is greater than VBACKUP, the
device power is switched from VCC to VBACKUP when
VCC drops below VBACKUP. The registers are maintained
from the VBACKUP source until VCC is returned to nominal
write access is allowed after tREC (Figure 2). 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).
Oscillator Circuit
The DS1339A uses an external 32.768kHz crystal. The
oscillator circuit does not require any external resistors
or capacitors to operate. Table 2 specifies several
crystal parameters for the external crystal. The Functional
Diagram shows a basic schematic of the oscillator circuit.
The startup time is usually less than 1 second when using
a crystal with the specified characteristics.
Table 1. Power Control
Table 2. Crystal Specifications*
*The crystal, traces, and crystal input pins should be isolated
from RF generating signals. Refer to Application Note 58:
tional specifications.
SUPPLY CONDITION
READ/
WRITE
ACCESS
POWERED
BY
VCC < VPF, VCC < VBACKUP
No
VBACKUP
VCC < VPF, VCC > VBACKUP
No
VCC
VCC > VPF, VCC < VBACKUP
Yes
VCC
VCC > VPF, VCC > VBACKUP
Yes
VCC
PARAMETER
SYMBOL MIN
TYP
MAX UNITS
Nominal
Frequency
fO
32.768
kHz
Series Resistance
ESR
60
kI
Load
Capacitance
CL
6
pF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| DS1339C-2 | 功能描述:实时时钟 I2C 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 |
| DS1339C-2- | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:I2C Serial Real-Time Clock |
| DS1339C-2# | 功能描述:实时时钟 I2C 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 |
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