參數(shù)資料
型號： DS12885TN
英文描述： Real-Time Clock
中文描述： 實時時鐘
文件頁數(shù)： 3/4頁
文件大?。?/td> 132K
代理商： DS12885TN
DS12885/DS12885Q/DS12885T
3 of 4
PIN DESCRIPTION
AD0–AD7
N.C.
MOT
CS
AS
R/
W
DS
RESET
PIN DESCRIPTION
X1, X2 –
Connections for a standard 32.768kHz quartz crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (C
L
) of 6pF. The crystal is
connected directly to the X1 and X2 pins. There is no need for external capacitors or resistors. Note: X1
and X2 are very high-impedance nodes. It is recommended that they and the crystal be guard-ringed with
ground and that high-frequency signals be kept away from the crystal area. For more information about
crystal selection and crystal layout considerations, refer to
Application Note 58
“Crystal Considerations
with Dallas Real Time Clocks.”
Oscillator startup times are highly dependent upon crystal characteristics and layout. High ESR and
escessive capactitive loads are the major contributors to long startup times. A circuit using a crystal with
the recommended characteristics and following the recommended layout usually start within one second.
V
BAT
–
Battery input for any standard 3V lithium cell or other energy source. Battery voltage must be
held between 2.5V and 4V for proper operation. A maximum load of 0.5
μ
A at +25°C in the absence of
power should be used to size the external energy source. Maximum load is measured using a
recommended crystal type connected to X1 and X2.
The battery should be connected directly to the V
BAT
pin. A diode must not be placed in series with the
battery to the V
BAT
pin. Furthermore, a diode is not necessary because reverse charging-current protection
circuitry is provided internally to the device and has passed the requirements of Underwriters
Laboratories for UL listing.
See “Conditions of Acceptability” at
.
相關(guān)PDF資料
PDF描述
DS12887 Real Time Clock
DS12B887 Real Time Clock
DS12C887A Real-Time Clock
DS12C887 Real Time Clock
DS1300-3 1300 Watts 12V Distributed Power System
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS12885TN+ 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS12887 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS12887+ 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS12887A 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS12887A+ 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。