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参数资料
| 型号： | DS1689SN |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/36页 |
| 文件大小： | 0K |
| 描述： | IC RTC SER NV RAM CTRL IN 28SOIC |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | NVSRAM |
| 存储容量： | 114B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 2.7 V ~ 3.3 V，4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.5 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC |
| 包装： | 管件 |
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DS1689/DS1693
7 of 36
POWER-DOWN/POWER-UP CONSIDERATIONS
The real-time clock function will continue to operate and all of the RAM, time, calendar, and alarm
memory locations remain nonvolatile regardless of the level of the VCCI input. When VCCI is applied to
the DS1689/DS1693 and reaches a level of greater than VPF (power fail trip point), the device becomes
accessible after tREC, provided that the oscillator is running and the oscillator countdown chain is not in
reset (see Register A). This time period allows the system to stabilize after power is applied.
When PSEL is floating or logic 0, the DS1689 is in autosense mode and 3V or 5V operation is
determined based on the voltage on VCCI. Selection of 5V operation is automatically invoked when VCCI
rises above 4.5V for a minimum of tREC. However, 3V operation is automatically selected if VCCI does not
rise above the level of 4.25V. Selection of the power supply input levels requires 150ms of input stability
before operation can commence.
When 5V operation is selected, the device is fully accessible and data can be written and read only when
VCCI is greater than 4.5V. When VCCI is below 4.5V, read and writes are inhibited. However, the
timekeeping function continues unaffected by the lower input voltage. As VCC falls below the greater of
VBAT and VBAUX, the RAM and timekeeper are switched over to a lithium battery connected either to the
VBAT pin or VBAUX pin.
When 3V operation is selected and applied within normal limits, the device is fully accessible and data
can be written or read. When VCCI falls below VPF, access to the device is inhibited. If VPF is less than
VBAT and VBAUX, the power supply is switched from VCCI to the backup supply (the greater of VBAT and
VBAUX) when VCCI drops below VPF. If VPF is greater than VBAT and VBAUX, the power supply is switched
from VCCI to the backup supply when VCCI drops below the larger of VBAT and VBAUX.
When VCC falls below VPF, the chip is write-protected. With the possible exception of the KS, PWR, and
SQW pins, all inputs are ignored and all outputs are in a high impedance state.
RTC ADDRESS MAP
The address map for the RTC registers of the DS1689/DS1693 is shown in Figure 2. The address map
consists of the 14-clock/calendar registers. Ten registers contain the time, calendar, and alarm data, and
four bytes are used for control and status. All registers can be directly written or read except for the
following:
1. Registers C and D are read-only.
2. Bit 7 of Register A is read-only.
3. The high order bit of the seconds byte is read-only.
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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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