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參數(shù)資料
| 型號： | DS1643P-70 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| 封裝： | POWERCAP MODULE-34 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 180K |
| 代理商： | DS1643P-70 |
DS1643/DS1643P
3 of 14
BLOCK DIAGRAM DS1643 Figure 1
DS1643 TRUTH TABLE Table 1
VCC
CE
CE2
OE
WE
MODE
DQ
POWER
VIH
X
DESELECT
HIGH Z
STANDBY
XVIL
X
DESELECT
HIGH Z
STANDBY
VIL
VIH
XVIL
WRITE
DATA IN
ACTIVE
VIL
VIH
VIL
VIH
READ
DATA OUT
ACTIVE
5 VOLTS
± 10%
VIL
VIH
READ
HIGH Z
ACTIVE
<4.5 VOLTS
>VBAT
XXXX
DESELECT
HIGH Z
CMOS STANDBY
<VBAT
XXXX
DESELECT
HIGH Z
DATA RETENTION
MODE
SETTING THE CLOCK
The 8-bit of the control register is the write bit. Setting the write bit to a 1, like the read bit, halts updates
to the DS1643 registers. The user can then load them with the correct day, date and time data in 24 hour
BCD format. Resetting the write bit to a 0 then transfers those values to the actual clock counters and
allows normal operation to resume.
STOPPING AND STARTING THE CLOCK OSCILLATOR
The clock oscillator may be stopped at any time. To increase the shelf life, the oscillator can be turned off
to minimize current drain from the battery. The OSC bit is the MSB for the seconds registers. Setting it to
a 1 stops the oscillator.
FREQUENCY TEST BIT
Bit 6 of the day byte is the frequency test bit. When the frequency test bit is set to logic 1 and the
oscillator is running, the LSB of the seconds register will toggle at 512 Hz. When the seconds register is
being read, the DQ0 line will toggle at the 512 Hz frequency as long as conditions for access remain valid
(i.e., CE low, OE low, CE2 high, and address for seconds register remain valid and stable).
CLOCK ACCURACY (DIP MODULE)
The DS1643 is guaranteed to keep time accuracy to within
±1 minute per month at 25°C.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1643P and DS9034PCX are each individually tested for accuracy. Once mounted together, the
module is guaranteed to keep time accuracy to within
±1.53 minutes per month (35 ppm) at 25°C.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1643-70 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1644-120 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1644P-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1644P | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1644 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1643P-70+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1643P-85 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Nonvolatile Timekeeping RAMs |
| DS1643P-85+ | 功能描述:實時時鐘 NV Timekeeping RAM 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1644 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Nonvolatile Timekeeping RAM |
| DS1644+120 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
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