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DS1305EN 参数 Datasheet PDF下载

DS1305EN图片预览
型号: DS1305EN
PDF下载: 下载PDF文件 查看货源
内容描述: 闹钟的串行实时时钟RTC [Serial Alarm Real Time Clock RTC]
分类和应用: 闹钟时钟
文件页数/大小: 22 页 / 259 K
品牌: DALLAS [ DALLAS SEMICONDUCTOR ]
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DS1305  
SERIAL PERIPHERAL INTERFACE (SPI)  
The serial peripheral interface (SPI) is a synchronous bus for address and data transfer and is used when  
interfacing with the SPI bus on specific Motorola microcontrollers such as the 68HC05C4 and the  
68HC11A8. The SPI mode of serial communication is selected by tying the SERMODE pin to VCC.  
Four pins are used for the SPI. The four pins are the SDO (Serial Data Out), SDI (Serial Data In), CE  
(Chip Enable) and SCLK (Serial Clock). The DS1305 is the slave device in an SPI application, with the  
microcontroller being the master.  
The SDI and SDO pins are the serial data input and output pins for the DS1305, respectively. The CE  
input is used to initiate and terminate a data transfer. The SCLK pin is used to synchronize data  
movement between the master (microcontroller) and the slave (DS1305) devices.  
The shift clock (SCLK), which is generated by the microcontroller, is active only during address and data  
transfer to any device on the SPI bus. The inactive clock polarity is programmable in some  
microcontrollers. The DS1305 offers an important feature in that the level of the inactive clock is  
determined by sampling SCLK when CE becomes active. Therefore either SCLK polarity can be  
accommodated. Input data (SDI) is latched on the internal strobe edge and output data (SDO) is shifted  
out on the shift edge (see Table 3 and Figure 6). There is one clock for each bit transferred. Address and  
data bits are transferred in groups of eight.  
POWER SUPPLY CONFIGURATIONS FOR THE DS1305 Figure 5  
Configuration 1: Backup Supply is a Non-Rechargeable Lithium Battery  
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