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參數(shù)資料
| 型號： | DS1685Q-3 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 32/34頁 |
| 文件大小： | 455K |
| 代理商： | DS1685Q-3 |
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DS1685/DS1687 3V/5V Real-Time Clocks
7 of 34
Figure 1. Block Diagram
Power
Control
V
BAT
GND
OSC
BUS
Interface
V
CC
X1
X2
CS
WR
ALE
RD
AD0 - AD7
Divide
by 8
Divide by
64
Divide by
64
16:1 M ux
Square
W ave
Generator
Registers A, B,C,D
Clock/Calendar and
Alarm Registers
User Ram
114 Bytes
Clock/Calender
Update Logic
IR Q
SQW
RLC R
IRQ
Generator
Buffered Clock/
Calendar and Alarm
Registers
V
BAUX
Extended RAM Addr/
Data Registers
Extended Control/
Status Registers
64-Bit Serial Num ber
Century Counter
Date Alarm
RTC Address -2
RTC Address -3
Extended
User RAM
128 Bytes
RAM
Clear
Logic
DS1687 only
Select
PW R
KS
DS1685/DS1687
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.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1685S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685E-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS1685QN-3 | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS1685QN-5 | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS1685SN-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1685Q-3/T&R | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1685Q-3/TR | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clocks |
| DS1685Q-3_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:3V/5V Real-Time Clocks |
| DS1685Q-3+ | 功能描述:實時時鐘 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1685Q-3+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 242BYTE 28PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC 3V 64-BIT Y2KC 28-PLCC 制造商:Maxim Integrated Products 功能描述:Real Time Clock 3V/5V RTC |
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