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参数资料
| 型号： | DS1689SN |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, SOIC-28 |
| 文件页数： | 13/36页 |
| 文件大小： | 594K |
| 代理商： | DS1689SN |
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DS1689/DS1693
20 of 36
applied, the on-chip logic always attempts to drive the
PWR pin active in response to the enabled
kickstart or wake-up condition. This is true even if
PWR was previously inactive as the result of power
being applied by some means other than wake-up or kickstart.
The system can be powered down under software control by setting the PAB bit to logic 1. This causes
the open-drain
PWR pin to be placed in a high-impedance state, as shown at the beginning of interval 4 in
the timing diagram. As VCC voltage decays, the IRQ output pin is placed in a high-impedance state when
VCC goes below VPF. If the system is to be again powered on in response to a wake-up or kickstart, then
both the WF and KF flags should be cleared and WIE and/or KSE should be enabled prior to setting the
PAB bit.
During interval 5, the system is fully powered down. Battery backup of the clock calendar and NV RAM
is in effect,
PWR and IRQ are tri-stated, and monitoring of wake-up and kickstart takes place.
RAM CLEAR
The DS1689/DS1693 provide a RAM clear function for the 114 bytes of user RAM. When enabled, this
function can be performed regardless of the condition of the VCC pin.
The RAM clear function is enabled or disabled via the RAM Clear Enable bit (RCE; bank 1, register
04BH). When this bit is set to logic 1, the 114 bytes of user RAM are cleared (all bits set to 1) when an
active-low transition is sensed on the
RCLR pin. This action has no effect on either the clock/calendar
settings or upon the contents of the external extended RAM. The RAM clear flag (RF, bank 1, register
04BH) is set when the RAM clear operation has been completed. If VCC is present at the time of the RAM
clear and RIE = 1, the
IRQ line is also driven low upon completion. The interrupt condition can be
cleared by writing a 0 to the RF bit. The
IRQ line then returns to its inactive high level, provided there are
no other pending interrupts. Once the
RCLR pin is activated, all read/write accesses are locked out for a
minimum recover time, specified as tREC in the Electrical Characteristics section.
When RCE is cleared to 0, the RAM clear function is disabled. The state of the
RCLR pin has no effect
on the contents of the user RAM, and transitions on the
RCLR pin have no effect on RF.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1689S | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS1693 | 1 TIMER(S), REAL TIME CLOCK, PDMA28 |
| DS1689 | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| DS1720S+T&R | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
| DS1720S+ | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1689SN/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689SN/T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689SN/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC SER NV RAM CTRL IN 28SOIC |
| DS1689SN/T&R | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1689SN+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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