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參數(shù)資料
| 型號(hào)： | DS1647-120 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| 封裝： | MODULE, DIP-28 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 370K |
| 代理商： | DS1647-120 |
DS1647/DS1647P
3 of 11
BLOCK DIAGRAM DS1647 Figure 1
TRUTH TABLE DS1647 Table 1
VCC
CE
OE
WE
MODE
DQ
POWER
VIH
X
DESELECT
HIGH-Z
STANDBY
X
DESELECT
HIGH-Z
STANDBY
VIL
X
VIL
WRITE
DATA IN
ACTIVE
VIL
VIH
READ
DATA OUT
ACTIVE
5 VOLTS
±10%
VIL
VIH
READ
HIGH-Z
ACTIVE
<4.5 VOLTS >VBAT
X
DESELECT
HIGH-Z
CMOS STANDBY
<VBAT
X
DESELECT
HIGH-Z
DATA RETENTION
MODE
SETTING THE CLOCK
The eighth bit of the control register is the write bit. Setting the write bit to a one, like the read bit, halts
updates to the DS1647 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 zero 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 one 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 |
|---|---|
| DS1647P-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1647P | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1647 | 0 TIMER(S), REAL TIME CLOCK, DMA32 |
| DS1670 | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS1672-2 | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1647-120+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS1647-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
| DS1647D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Bus Transceiver |
| DS1647L-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
| DS1647L-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
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