VBAUX Auxiliary Battery Supply. Auxil" />
參數(shù)資料
型號： DS1689
廠商： Maxim Integrated Products
文件頁數(shù)： 12/36頁
文件大?。?/td> 0K
描述： IC RTC SER W/NV RAM CTRL 28-DIP
標準包裝： 13
類型： 時鐘/日歷
特點： NVSRAM
存儲容量： 114B
時間格式： HH:MM:SS（12/24 小時）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： 并聯(lián)
電源電壓： 2.7 V ~ 3.3 V，4.5 V ~ 5.5 V
電壓 - 電源，電池： 2.5 V ~ 3.7 V
工作溫度： 0°C ~ 70°C
安裝類型： 通孔
封裝/外殼： 28-DIP（0.600"，15.24mm）
供應商設備封裝： 28-PDIP
包裝： 管件
DS1689/DS1693
2 of 36
PIN DESCRIPTION
PIN
SO
EDIP
NAME
FUNCTION
1
VBAUX
Auxiliary Battery Supply. Auxiliary battery input required for
kickstart and wake-up features. This input also supports
clock/calendar and External NV RAM if VBAT is at lower voltage or
is not present. A standard +3V lithium cell or other energy source
can be used. Battery voltage must be held between +2.5V and +3.7V
for proper operation. If VBAUX is not going to be used it should be
grounded and auxiliary battery enable bit bank 1, register 4BH,
should = 0.
2, 3
—
X1, X2
Connections for Standard 32.768kHz Quartz Crystal. For greatest
accuracy, the DS1689 must be used with a crystal that has a
specified load capacitance of either 6pF or 12.5pF. The crystal select
(CS) bit in Extended Control Register 4B is used to select operation
with a 6pF or 12.5pF crystal. The crystal is attached 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 by guard-ringed with ground and that high-
frequency signals be kept away from the crystal area.
For more information on crystal selection and crystal layout
considerations, refer to Application Note 58: Crystal Considerations
with Dallas Real Time Clocks. The DS1689 can also be driven by an
external 32.768kHz oscillator. In this configuration, the X1 pin is
connected to the external oscillator signal and the X2 pin is floated.
4
RCLR
Active-Low RAM Clear Input. If enabled by software, taking
RCLR
low will result in the clearing of the 114 bytes of user RAM. When
enabled,
RCLR can be activated whether or not VCC is present.
5–12
AD0–AD7
Multiplexed Address/Data Bus. Multiplexed buses save pins because
address information and data information time-share the same signal
paths. The addresses are present during the first portion of the bus
cycle and the same pins and signal paths are used for data in the
second portion of the cycle. Address/data multiplexing does not slow
the access time of the DS1689 since the bus change from address to
data occurs during the internal RAM access time. Addresses must be
valid prior to the latter portion of ALE, at which time the
DS1689/DS1693 latches the address. Valid write data must be
present and held stable during the latter portion of the
WR pulse. In a
read cycle, the DS1689/
DS1693 outputs 8 bits of data during the latter portion of the
RD
pulse. The read cycle is terminated and the bus returns to a high
impedance state as
RD transitions high. The address/data bus also
serves as a bidirectional data path for the external extended RAM.
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相關代理商/技術參數(shù)
參數(shù)描述
DS1689_05 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
DS1689S 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1689S/R 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
DS1689S/T 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
DS1689S/T&R 制造商:Rochester Electronics LLC 功能描述:
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