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參數(shù)資料
| 型號： | DS1647P-120 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 0K |
| 描述： | IC RAM TIMEKEEP NV 120NS 34-PCM |
| 標準包裝： | 40 |
| 類型： | 時鐘/日歷 |
| 特點： | 閏年，NVSRAM |
| 存儲容量： | 512KB |
| 時間格式： | HH:MM:SS（24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 3V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 34-PowerCap? 模塊 |
| 供應商設備封裝： | 34-PowerCap 模塊 |
| 包裝： | 管件 |
DS1647/DS1647P
5 of 12
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 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 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 second’s 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 second’s register will toggle at 512Hz. When the seconds register is
being read, the DQ0 line will toggle at the 512Hz frequency as long as conditions for access remain valid
(i.e., CE low, OE low, and address for seconds register remain valid and stable).
CLOCK ACCURACY (DIP MODULE)
The DS1647 is guaranteed to keep time accuracy to within ±1 minute per month at +25°C. The RTC is
calibrated at the factory by Dallas Semiconductor using nonvolatile tuning elements, and does not require
additional calibration. For this reason, methods of field clock calibration are not available and not
necessary. Clock accuracy is also affected by the electrical environment and caution should be taken to
place the RTC in the lowest-level EMI section of the PC board layout. For additional information, refer
to Application Note 58.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1647 and DS9034PCX are each individually tested for accuracy. Once mounted together, the
module will typically keep time accuracy to within ±1.53 minutes per month (35ppm) at +25°C. Clock
accuracy is also affected by the electrical environment and caution should be taken to place the RTC in
the lowest-level EMI section of the PC board layout. For additional information, refer to Application
Note 58.
Table 2. Register Map—BANK1
ADDRESS
DATA
FUNCTION
B7
B6
B5
B4
B3
B2
B1
B0
7FFFF
—
Year
00–99
7FFFE
X
—
Month
01–12
7FFFD
X
—
Date
01–31
7FFFC
X
FT
X
—
Day
01–07
7FFFB
X
—
Hour
00–23
7FFFA
X
—
Minutes
00–59
7FFF9
OSC
—
Seconds
00–59
7FFF8
W
R
X
Control
A
OSC
= STOP BIT
R = READ BIT
FT = FREQUENCY TEST
W = WRITE BIT
X = UNUSED
Note:
All indicated “X” bits are unused, but must be set to “0” when written to ensure proper clock operation.
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相關代理商/技術參數(shù) |
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| DS1647P-120+ | 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1648 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:TRI-STATE TTL to MOS Multiplexers/Drivers |
| DS1648J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-Input Digital Multiplexer |
| DS1648J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-Input Digital Multiplexer |
| DS1649 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Hex TRI-STATEE TTL to MOS Drivers |
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