參數(shù)資料
型號： DS1689
英文描述： 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control
文件頁數(shù)： 20/32頁
文件大?。?/td> 321K
代理商： DS1689
DS1689/DS1693
20 of 32
VRT2
- This status bit gives the condition of the auxiliary battery. It is set to a logic 1 condition when the
external lithium battery is connected to the V
BAUX
. If this bit is read as a logic 0, the external battery
should be replaced.
INCR
- Increment in Progress status bit. This bit is set to a 1 when an increment to the time/date registers
is in progress and the alarm checks are being made. INCR will be set to a 1 at 122 s before the update
cycle starts and will be cleared to 0 at the end of each update cycle.
PAB
- Power Active Bar control bit. When this bit is 0, the
PWR
pin is in the active low state. This bit
can be written to a logic 1 or 0 by the user. If either WF AND WIE = 1 OR KF AND KSE = 1, the PAB
bit will be cleared to 0.
RF
- Ram Clear Flag - This bit will be set to a logic 1 when a high to low transition occurs on the
RCLR
input if RCE=1. The RF bit is cleared by writing it to a logic 0. This bit can also be written to a logic 1 to
force an interrupt condition.
WF
– Wake-up Alarm Flag - This bit is set to 1 when a wake-up alarm condition occurs or when the user
writes it to a 1. WF is cleared by writing it to a 0.
KF
- Kickstart Flag - This bit is set to a 1 when a kickstart condition occurs or when the user writes it to a
1. This bit is cleared by writing it to a logic 0.
EXTENDED CONTROL REGISTER 4B
MSB LSB
BIT 7
BIT 6
BIT 5
BIT 4
ABE
E32K
CS
RCE
BIT 3
PRS
BIT 2
RIE
BIT 1
WIE
BIT 0
KSE
ABE
- Auxiliary Battery Enable. This bit when written to a logic 1 will enable the V
BAUX
pin for
extended functions.
E32K
- Enable 32,768 output. This bit when written to a logic 1 will enable the 32,768 Hz oscillator
frequency to be output on the SQW pin provided SQWE=1.
CS
- Crystal Select Bit. When CS is set to a 0, the oscillator is configured for operation with a crystal that
has a 6 pF specified load capacitance. When CS=1, the oscillator is configured for a 12.5 pF crystal.
RCE
- RAM Clear Enable bit. When set to a 1, this bit enables a low level on pin 4 (
RCLR
) to clear all
114 bytes of user RAM. When RCE = 0, the RAM clear function is disabled.
PRS
- PAB Reset Select Bit. When set to a 0 the
PWR
pin will be set hi-Z when the DS1689 goes into
power-fail. When set to a 1, the
PWR
pin will remain active upon entering power-fail.
RIE
- Ram Clear Interrupt Enable. When RIE is set to a 1, the
IRQ
pin will be driven low when a RAM
clear function is completed.
WIE
– Wake-Up Alarm Interrupt Enable. When V
CC
voltage is absent and WIE is set to a 1, the PWR pin
will be driven active low when a wake-up condition occurs, causing the WF bit to be set to 1. When V
CC
is then applied, the
IRQ
pin will also be driven low. If WIE is set while system power is applied, both
相關PDF資料
PDF描述
DS1689S 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control
DS1689SN 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control
DS1693 3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control
DS1699-010 ELECTRONIC DIGITAL RHEOSTAT
DS1699-10 ELECTRONIC DIGITAL RHEOSTAT
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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