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参数资料
| 型号： | DS1685SN-5 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| 封装： | SOIC-24 |
| 文件页数： | 8/39页 |
| 文件大小： | 290K |
| 代理商： | DS1685SN-5 |
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DS1685/DS1687
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EXTENDED FUNCTIONS
The extended functions provided by the DS1685/DS1687 that are new to the RAMified RTC family are
accessed via a software controlled bank switching scheme, as illustrated in Figure 4. In bank 0, the
clock/calendar registers and 50 bytes of user RAM are in the same locations as for the DS1287. As a
result, existing routines implemented within BIOS, DOS, or application software packages can gain
access to the DS1685/DS1687 clock registers with no changes. Also in bank 0, an extra 64 bytes of RAM
are provided at addresses just above the original locations for a total of 114 directly addressable bytes of
user RAM.
When bank 1 is selected, the clock/calendar registers and the original 50 bytes of user RAM still appear
as bank 0. However, the Dallas registers which provide control and status for the extended functions will
be accessed in place of the additional 64 bytes of user RAM. The major extended functions controlled by
the Dallas registers are listed below:
1. 64-bit Silicon Serial Number
2. Century counter
3. Date Alarm
4. Auxiliary Battery Control/Status
5. Wake-up
6. Kickstart
7. RAM Clear Control/Status
8. 128-bytes Extended RAM Access
The bank selection is controlled by the state of the DV0 bit in register A. To access bank 0 the DV0 bit
should be written to a 0. To access bank 1, DV0 should be written to a 1. Register locations designated
as reserved in the bank 1 map are reserved for future use by Dallas Semiconductor.
Bits in these
locations cannot be written and will return a 0 if read.
SILICON SERIAL NUMBER
A unique 64-bit lasered serial number is located in bank 1, registers 40h - 47h. This serial number is
divided into three parts. The first byte in register 40h contains a model number to identify the device type
and revision of the DS1685/DS1687. Registers 41h - 46h contain a unique binary number. Register 47h
contains a CRC byte used to validate the data in registers 40h - 46h. All 8 bytes of the serial number are
read-only registers.
The DS1685/DS1687 is manufactured such that no two devices will contain an identical number in
locations 41h - 47h.
CENTURY COUNTER
A register has been added in bank 1, location 48H, to keep track of centuries. The value is read in either
binary or BCD according to the setting of the DM bit.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1687-3 | 1 TIMER(S), REAL TIME CLOCK, DIP24 |
| DS1685S-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685EN-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685E-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685EN-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1685SN-5/T& | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clocks |
| DS1685SN-5/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS1685SN-5/T&R | 功能描述:实时时钟 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 |
| DS1685SN-5/TR | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clocks |
| DS1685SN-5+ | 功能描述:实时时钟 3V/5V 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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