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    參數(shù)資料
    

    


    


    
型號(hào)：
X1205S8IT1

    

    
廠商：
Intersil

    

    
文件頁(yè)數(shù)：
10/22頁(yè)

    

    
文件大小：
0K

    

    
描述：
IC RTC/CALENDAR 2-WIRE 8-SOIC

    

    
標(biāo)準(zhǔn)包裝：
2,500

    

    
類型：
時(shí)鐘/日歷
    		

    

    
特點(diǎn)：
警報(bào)器，閏年
    		

    

    
時(shí)間格式：
HH:MM:SS（12/24 小時(shí)）
    		

    

    
數(shù)據(jù)格式：
YY-MM-DD-dd
    		

    

    
接口：
I²C，2 線串口
    		

    

    
電源電壓：
2.7 V ~ 5.5 V
    		

    

    
電壓 - 電源，電池：
1.8 V ~ 5.5 V
    		

    

    
工作溫度：
-40°C ~ 85°C
    		

    

    
安裝類型：
表面貼裝
    		

    

    
封裝/外殼：
8-SOIC（0.154"，3.90mm 寬）
    		

    

    
供應(yīng)商設(shè)備封裝：
8-SOIC
    		

    

    
包裝：
帶卷 (TR)
    		

    

    

    

	
    
    
    

    
    
	
    18
    FN8097.3
    May 2, 2006
    A final application for the ATR control is in-circuit cali-
    bration for high accuracy applications, along with a
    temperature sensor chip. Once the RTC circuit is pow-
    ered up with battery backup, the PHZ output is set at
    32.768kHz and frequency drift is measured. The ATR
    control is then adjusted to a setting which minimizes
    drift. Once adjusted at a particular temperature, it is
    possible to adjust at other discrete temperatures for
    minimal overall drift, and store the resulting settings in
    the EEPROM. Extremely low overall temperature drift
    is possible with this method. The Intersil evaluation
    board contains the circuitry necessary to implement
    this control.
    For more detailed operation see Intersil’s application
    note AN154 on Intersil’s website at www.intersil.com.
    Layout Considerations
    The crystal input at X1 has a very high impedance and
    will pick up high frequency signals from other circuits on
    the board. Since the X2 pin is tied to the other side of
    the crystal, it is also a sensitive node. These signals can
    couple into the oscillator circuit and produce double
    clocking or mis-clocking, seriously affecting the accu-
    racy of the RTC. Care needs to be taken in layout of the
    RTC circuit to avoid noise pickup. Below in Figure 12 is
    a suggested layout for the X1205 SOIC device.
    Figure 12. Suggested Layout for Intersil RTC in SO-8
    The X1 and X2 connections to the crystal are to be
    kept as short as possible. A thick ground trace around
    the crystal is advised to minimize noise intrusion, but
    ground near the X1 and X2 pins should be avoided as
    it will add to the load capacitance at those pins. Keep
    in mind these guidelines for other PCB layers in the
    vicinity of the RTC device. A small decoupling capaci-
    tor at the Vcc pin of the chip is mandatory, with a solid
    connection to ground.
    Assembly
    Most electronic circuits do not have to deal with
    assembly issues, but with the RTC devices assembly
    includes insertion or soldering of a live battery into an
    unpowered circuit. If a socket is soldered to the board,
    and a battery is inserted in final assembly, then there
    are no issues with operation of the RTC. If the battery
    is soldered to the board directly, then the RTC device
    Vback pin will see some transient upset from either
    soldering tools or intermittent battery connections
    which can stop the circuit from oscillating. Once the
    battery is soldered to the board, the only way to assure
    the circuit will start up is to momentarily (very short
    period of time!) short the Vback pin to ground and the
    circuit will begin to oscillate.
    Oscillator Measurements
    When a proper crystal is selected and the layout guide-
    lines above are observed, the oscillator should start up
    in most circuits in less than one second. Some circuits
    may take slightly longer, but startup should definitely
    occur in less than 5 seconds. When testing RTC cir-
    cuits, the most common impulse is to apply a scope
    probe to the circuit at the X2 pin (oscillator output) and
    observe the waveform. DO NOT DO THIS! Although in
    some cases you may see a useable waveform, due to
    the parasitics (usually 10pF to ground) applied with the
    scope probe, there will be no useful information in that
    waveform other than the fact that the circuit is oscillat-
    ing. The X2 output is sensitive to capacitive impedance
    so the voltage levels and the frequency will be affected
    by the parasitic elements in the scope probe. Applying a
    scope probe can possibly cause a faulty oscillator to
    start up, hiding other issues (although in the Intersil
    RTC’s, the internal circuitry assures startup when using
    the proper crystal and layout).
    The best way to analyze the RTC circuit is to power it
    up and read the real time clock as time advances, or if
    the chip has the PHZ output, look at the output of that
    pin on an oscilloscope (after enabling it with the con-
    trol register, and using a pullup resistor for an open-
    drain output). Alternatively, the X1226/1286/1205
    devices have an IRQ- output which can be checked by
    setting an alarm for each minute. Using the pulse
    interrupt mode setting, the once-per-minute interrupt
    functions as an indication of proper oscillation.
    Backup Battery Operation
    Many types of batteries can be used with the Intersil
    RTC products. 3.0V or 3.6V Lithium batteries are
    appropriate, and sizes are available that can power a
    Intersil RTC device for up to 10 years. Another option
    is to use a supercapacitor for applications where Vcc
    may disappear intermittently for short periods of time.
    X1205
    
    
    
    
    
    


    


    

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    相關(guān)代理商/技術(shù)參數(shù)
    		

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X1205S8IZ
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X1205S8T1
功能描述:IC RTC/CALENDAR 2-WIRE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件

    

    
X1205S8Z
功能描述:IC RTC/CALENDAR/ALARM 4K 8-SOIC RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件

    

    
X1205S8ZT1
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