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參數(shù)資料
| 型號(hào)： | DS1644 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| 封裝： | 0.720 INCH, PLASTIC, MODULE, DIP-28 |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大?。?/td> | 178K |
| 代理商： | DS1644 |
DS1644/DS1644P
3 of 11
DS1644 BLOCK DIAGRAM Figure 1
DS1644 TRUTH TABLE Table 1
VCC
CE
OE
WE
MODE
DQ
POWER
VIH
X
DESELECT
HIGH-Z
STANDBY
X
DESELECT
HIGH-Z
STANDBY
VIL
XVIL
WRITE
DATA IN
ACTIVE
VIL
VIH
READ
DATA OUT
ACTIVE
5V
± 10%
VIL
VIH
READ
HIGH-Z
ACTIVE
<4.5V >VBAT
X
DESELECT
HIGH-Z
CMOS STANDBY
<VBAT
X
DESELECT
HIGH-Z
DATA RETENTION
MODE
SETTING THE CLOCK
The MSB Bit, (B7) of the control register is the write bit. Setting the write bit to a 1, like the read bit,
halts updates to the DS1644 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, and address for seconds register remain valid and stable).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1646-120 | 0 TIMER(S), REAL TIME CLOCK, DMA32 |
| DS1646P-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1646L-120 | 0 TIMER(S), REAL TIME CLOCK, DSO34 |
| DS1646 | 0 TIMER(S), REAL TIME CLOCK, DMA32 |
| DS1646P | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1644+120 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS16440-120 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS16440120+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1644-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| DS1644-120 | 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
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