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参数资料
| 型号： | DS1371 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 通用总线功能 |
| 英文描述： | 2-Wire, 32-Bit Binary Counter Watchdog Clock |
| 中文描述： | I²C、32位二进制计数器看门狗时钟 |
| 文件页数： | 6/14页 |
| 文件大小： | 966K |
| 代理商： | DS1371 |
DS1371
6 of 14
PIN DESCRIPTION
PIN
NAME
FUNCTION
1, 2
X1, X2
These signals are connections for a standard 32.768kHz quartz crystal. The internal
oscillator circuitry is designed for operation with a crystal having a specified load
capacitance (C
L
) of 6pF.
For more information about crystal selection and crystal layout considerations, refer to
Application Note 58: Crystal Considerations with Dallas Real-Time Clocks
. The
DS1371 can also be driven by an external 32.768kHz oscillator. In this configuration,
the X1 pin is connected to the external oscillator signal and the X2 pin is floated.
Watchdog Input. A positive edge-triggered hardware interrupt input that restarts the
watchdog counter when this signal transitions from a low to a high. While WDS remains
at a static low or high, the watchdog counter continues to decrement.
Ground
3
WDS
4
GND
5
SDA
2-Wire Serial Data. Input/output for 2-wire data.
6
SCL
2-Wire Serial Clock. Input for 2-wire clock.
Square-Wave/Interrupt Output. This pin is used to output the programmable square-
wave or alarm interrupt signal. It is open drain and requires an external pullup resistor.
7
SQW/
INT
8
V
CC
Supply Voltage Terminal
Detailed Description
The DS1371 is a real-time clock (RTC) with a 2-wire serial interface that provides elapsed seconds from
a user-defined starting point in a 32-bit counter (Figure 2). A 24-bit counter can be configured as either a
watchdog counter or as an alarm counter. An on-chip oscillator circuit uses a customer-supplied
32.768kHz crystal to keep time.
Oscillator Circuit
The DS1371 uses an external 32.768kHz crystal. The oscillator circuit does not require any external
resistors or capacitors to operate. Table 1 specifies several crystal parameters for the external crystal;
Figure 3 shows a functional schematic of the oscillator circuit. Using a crystal with the specified
characteristics, the startup time is usually less than one second.
Clock Accuracy
The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match
between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was
trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External
circuit noise coupled into the oscillator circuit can result in the clock running fast. Figure 4 shows a
typical PC board layout for isolation of the crystal and oscillator from noise. Refer to
Application Note
58: Crystal Considerations with Dallas Real-Time Clocks
for detailed information.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1371_07 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:I2C, 32-Bit Binary Counter |
| DS1371U | 功能描述:实时时钟 I2C 32 bit Binary Counter 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 |
| DS1371U/C01 | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC USOP DEXCOM - Rail/Tube |
| DS1371U/T&R | 功能描述:实时时钟 I2C 32 bit Binary Counter 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 |
| DS1371U+ | 功能描述:实时时钟 I2C 32 bit Binary Counter 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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