收藏本站
DS1685/DS1687 3V/5V Real-Time Clocks
6 of 34
Figure 1. Block Diagram
OSCILLATOR CIRCUIT
The DS1685 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, and Figure 2 shows a
functional schematic of the oscillator circuit. The oscillator is controlled by an enable bit in the control register.
Oscillator startup times are highly dependent upon crystal characteristics, PC board leakage, and layout. High ESR
and excessive capacitive loads are the major contributors to long startup times. A circuit using a crystal with the
recommended characteristics and proper layout usually starts within one second.
Power
Control
VBAT
GND
OSC
BUS
Interface
VCC
X1
X2
CS
WR
ALE
RD
AD0 - AD7
Divide
by 8
Divide by
64
Divide by
64
16:1 Mux
Square
Wave
Generator
Registers A, B,C,D
Clock/Calendar and
Alarm Registers
User Ram
114 Bytes
Clock/Calender
Update Logic
IRQ
SQW
RLCR
IRQ
Generator
Buffered Clock/
Calendar and Alarm
Registers
VBAUX
Extended RAM Addr/
Data Registers
Extended Control/
Status Registers
64-Bit Serial Number
Century Counter
Date Alarm
RTC Address -2
RTC Address -3
Extended
User RAM
128 Bytes
RAM
Clear
Logic
DS1687 only
Select
PWR
KS
DS1685/DS1687
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
DS1688S+ IC RTC W/NV RAM CTRL 28-SOIC
DS1689SN+T&R IC RTC SER NV RAM CTRL IN 28SOIC
DS17285S-3NT IC RTC 3V 2K NV RAM 24-SOIC
DS1742-100IND IC RTC RAM Y2K 5V 100NS 24-EDIP
DS1743P-70+ IC RTC RAM Y2K 5V 70NS 34-PCM
DS1744-70IND IC RTC RAM Y2K 5V 70NS 28-EDIP
DS1746-70IND IC RTC RAM Y2K 5V 70NS 32-EDIP
DS1747W-120IND IC RTC RAM Y2K 3.3V 120NS 32EDIP
相关代理商/技术参数
DS1685EN-5/TR 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clocks
DS1685EN-5_12 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:3V/5V Real-Time Clocks
DS1685EN-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
DS1685EN-5+T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 242BYTE 24TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC 5V 64BIT Y2KC IND 24TSSOP
DS1685EN-5+T&R 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
DS1685EN-5+TR 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clocks
DS1685N-3 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock
DS1685N-5 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock