PDF《典型工作电路》

??Maxim Integrated Products??1 概述 DS3232M是低成本、超高精度I2C实时时钟(RTC),带有 236字节电池备份SRAM.

该器件集成了电池输入,当器件 主电源断电时可保持精确计时.集成微机电系统(MEMS) 振荡电路保持器件的长期精确度,并减少了生产线的元件 数量. RTC提供秒、分、时、星期、日期、月和年信息.少于31 天的月份,自动调整月末日期,包括闰年修正.时钟格式 可以是24小时或带AM/PM指示的12小时格式.提供两个 可设置的日历闹钟和一路1Hz输出.地址与数据通过I2C双 向总线串口传输.高精度、经过温度补偿的电压基准和比 较器电路用来监测VCC状态,检测电源故障,提供复位输 出,并在必要时自动切换到备份电源.另外,RST监测引 脚可以作为产生微处理器复位的按键输入,详细信息请参 考方框图. 应用 电表 工业应用 特性 S -40°C至+85°C温度范围内,计时精度保持在±5ppm (±0.432秒/天) S 236字节电池备份用户SRAM S 为连续计时提供电池备份 S 低功耗 S 功能兼容于DS3232 S 完整的时钟日历,包括秒、分、时、星期、日期、月和 年,并提供有效期到2100年的闰年补偿 S 两个日历闹钟 S 1Hz和32.768kHz输出 S 复位输出和按键去抖输入 S 高速(400kHz) I2C兼容串行总线 S +2.3V至+4.5V电源电压 S 精度为±3°C的数字温度传感器 S -40°C至+85°C工作温度范围 S 8引脚SO (150 mil)封装 S 通过美国保险商实验室协会(UL)认证 典型工作电路 19-6247;

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3/12 定购信息在数据资料的最后给出. 注意:该器件某些版本的规格可能与发布的规格不同,会以勘误表的形式给出.通过不同销售渠道可能同时获得器件的多个版本.欲了解器件勘误表信 息,请点击:china.maxim-ic.com/errata. 相关型号以及配合该器件使用的推荐产品,请参见:china.maxim-ic.com/DS3232M.related. DS3232M SCL SDA 32KHZ VBAT VCC VCC CPU I/O PORT INTERRUPTS INT/SQW RST PUSH- BUTTON RESET Maxim Integrated Products??2 DS3232M ±5ppm、内置SRAM的I2 C实时时钟 Voltage Range on Any Pin Relative to GND.0.3V to +6.0V Operating Temperature Range.40NC to +85NC Storage Temperature Range.55NC to +125NC Lead Temperature (soldering, 10s)260NC Soldering Temperature (reflow)260NC Absolute Maximum Ratings Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Conditions (TA = -40NC to +85NC, unless otherwise noted.) (Note 1) Electrical Characteristics―Frequency and Timekeeping (VCC or VBAT = +3.3V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and TA?=?+25NC, unless otherwise noted.) (Note 1) DC Electrical Characteristics―General (VCC = +2.3V to +4.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, VBAT = +3.0V, and TA?=?+25NC, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1Hz Frequency Tolerance Df/fOUT Measured over R 10s interval Q5 ppm 1Hz Frequency Stability vs. VCC Voltage Df/V Q1 ppm/V Timekeeping Accuracy tKA Q0.432 Seconds/ Day 32kHz Frequency Tolerance Df/fOUT Q2.5 % PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VCC 2.3 3.3 4.5 V VBAT 2.3 3.0 4.5 Logic