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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  
PIN DESCRIPTION  
VCC1  
- Primary Power Supply  
VCC2  
- Backup Power Supply  
- +3V Battery Input  
- Interface Logic Power Supply Input  
- Ground  
VBAT  
VCCIF  
GND  
X1, X2  
- 32.768 kHz Crystal Connection  
INT0  
- Interrupt 0 Output  
INT1  
SDI  
SDO  
CE  
- Interrupt 1 Output  
- Serial Data In  
- Serial Data Out  
- Chip Enable  
SCLK  
- Serial Clock  
SERMODE - Serial Interface Mode  
PF  
- Power Fail Output  
DESCRIPTION  
The DS1305 Serial Alarm Real Time Clock provides a full BCD clock calendar which is accessed via a  
simple serial 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 less than 31 days,  
including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with  
AM/PM indicator. In addition 96 bytes of nonvolatile RAM are provided for data storage.  
An interface logic power supply input pin (VCCIF) allows the DS1305 to drive SDO and PF pins to a level  
that is compatible with the interface logic. This allows an easy interface to 3-volt logic in mixed supply  
systems.  
The DS1305 offers dual power supplies as well as a battery input pin. The dual power supplies support a  
programmable trickle charge circuit which allows a rechargeable energy source (such as a super cap or  
rechargeable battery) to be used for a backup supply. The VBAT pin allows the device to be backed up by  
a non-rechargeable battery. The DS1305 is fully operational from 2.0 to 5.5 volts.  
Two programmable time of day alarms are provided by the DS1305. Each alarm can generate an  
interrupt on a programmable combination of seconds, minutes, hours and day. “Don’t care” states can be  
inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time of  
day alarms can be programmed to assert two different interrupt outputs or to assert one common interrupt  
output. Both interrupt outputs operate when the device is powered by VCC1, VCC2, or VBAT  
.
The DS1305 supports a direct interface to Motorola SPI serial data ports or standard 3-wire interface. A  
straightforward address and data format is implemented in which data transfers can occur 1 byte at a time  
or in multiple-byte burst mode.  
OPERATION  
The block diagram in Figure 1 shows the main elements of the Serial Alarm RTC. The following  
paragraphs describe the function of each pin.  
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