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參數(shù)資料
| 型號(hào)： | DS1307+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 64 x 8, Serial, I<sup>2</sup>C Real-Time Clock |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP8 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 296K |
| 代理商： | DS1307+ |
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DS1307 64 x 8, Serial, I
2
C Real-Time Clock
OSCILLATOR CIRCUIT
The DS1307 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. Figure 1 shows a
functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is
usually less than one second.
CLOCK ACCURACY
The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between
the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional
error will be added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the
oscillator circuit may result in the clock running fast. Refer to Application Note 58:
Crystal Considerations with
Dallas Real-Time Clocks
for detailed information.
Table 1. Crystal Specifications*
PARAMETER
SYMBOL
MIN
TYP
Nominal Frequency
f
O
32.768
Series Resistance
ESR
Load Capacitance
C
L
12.5
MAX
45
UNITS
kHz
k
pF
*
The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks
for additional specifications.
Figure 2. Recommended Layout for Crystal
RTC AND RAM ADDRESS MAP
Table 2 shows the address map for the DS1307 RTC and RAM registers. The RTC registers are located in address
locations 00h to 07h. The RAM registers are located in address locations 08h to 3Fh. During a multibyte access,
when the address pointer reaches 3Fh, the end of RAM space, it wraps around to location 00h, the beginning of
the clock space.
NOTE:
AVOID ROUTING SIGNAL LINES IN THE CROSSHATCHED AREA (UPPER
LEFT QUADRANT) OF THE PACKAGE UNLESS THERE IS A GROUND PLANE
BETWEEN THE SIGNAL LINE AND THE DEVICE PACKAGE.
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
GND
7 of 14
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相關(guān)代理商/技術(shù)參數(shù) |
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| DS1307_06 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:64 x 8, Serial, I2C Real-Time Clock |
| DS1307+ | 功能描述:實(shí)時(shí)時(shí)鐘 64x8 Serial I2C 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(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 |
| DS1307+ | 制造商:Maxim Integrated Products 功能描述:IC RTC SERIAL 64X8 8DIP 制造商:Maxim Integrated Products 功能描述:IC, RTC, SERIAL, 64X8, 8DIP 制造商:Maxim Integrated Products 功能描述:IC, RTC, SERIAL, 64X8, 8DIP; Date Format:Day; Date; Month; Year; Clock Format:HH:MM:SS; Clock IC Type:RTC; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:8; Interface Type:I2C, Serial; ;RoHS Compliant: Yes |
| DS1307FP000 | 制造商:Thomas & Betts 功能描述:100A,CON,3P4W,MG,307,125/250V |
| DS1307FRA00 | 制造商:Thomas & Betts 功能描述:100A,REC,3P4W,MG,307,AGL,125/250V |
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