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广州周立功单片机发展有限公司地址:广州市天河北路689号光大银行大厦15楼F1低功耗微处理器监控电路专注的力量成就梦想目录目录1.特性.............................................................................................................................................12.描述.............................................................................................................................................13.极限参数.....................................................................................................................................24.规范.............................................................................................................................................35.特性...........................................................................................................................................116.操作原理...................................................................................................................................117.复位输出...................................................................................................................................118.看门狗定时器...........................................................................................................................129.供电失败比较器.......................................................................................................................1210.手动复位.................................................................................................................................1311.Vcc下降到0V,可确保得到一个有效的RESET输出.......................................................1312.监控电压与未调节DC输入端不同点..................................................................................1313.监控负电压源..........................................................................................................................1414.与uP(带准双向RESET引脚)的接口.............................................................................1415.负向瞬态Vcc..........................................................................................................................1416.应用设计.................................................................................................................................1517.订购信息.................................................................................................................................20附录A周立功公司相关信息.......................................................................................................221.特性z高精度低电压监控器:2.63V下的SP706P/R及SP708R2.93V下的SP706S及SP708S3.08V下的SP706T及SP708Tz复位脉冲宽度200ms;z独立的看门狗定时器-溢出周期1.6s(SP706P/S/R/T);z最大电源电流40uA;z去抖TTL/CMOS手动复位输入;zVcc下降至1V时产生RESET信号;zRESET输出:SP706P高电平有效;SP706R/S/T低电平有效;SP708R/S/T支持高/低电平两种方式;zWDI可以保持为浮空,以禁止看门狗功能;z内置Vcc干扰抑止电路;z提供8引脚PDIP,NSOIC及uSOIC封装;z电压监控器,可监控供电失败或电池电压不足;z706P/R/S/T及708R/S/T引脚兼容性增强以符合工业标准;2.描述SP706P/S/R/T,SP708R/S/T系列属于微处理器(uP)监控器件。其集成有众多组件,可监测uP及数字系统中的供电及电池的工作情况。由于以上众多组件的使用,SP706P/S/R/T,SP708R/S/T系列可有效地增强系统的可靠性及工作效率。SP706P/S/R/T,SP708R/S/T系列包含一个看门狗定时器,一个uP复位模块,一个供电失败比较器,及一个手动复位输入模块。SP706P/S/R/T,SP708R/S/T系列适用于+3.0V或+3.3V环境,如计算机,汽车系统,控制器,及其他一些智能仪器。对于对电源供电要求严格的uP系统/数字处理系统,SP706P/R/S/T,SP708R/S/T系列是一款非常理想的选择。1型号RESET有效态RESET阈值手动复位PFI准确率看门狗输入SP706P高2.63VYES4%YESSP706R低2.63VYES4%YESSP706S低2.93VYES4%YESSP706T低3.08VYES4%YESSP708R低/高2.63VYES4%NOSP708S低/高2.93VTES4%NOSP708T低/高3.08VYES4%NO3.极限参数这里只列出了重要的额定值,器件在这些额定值下的功能运作或者在下面规范的操作部分中指示的任何其它操作都并未涉及。长期处于极限工作状态将影响器件的稳定性。终端电压(以GND为基准):Vcc………………………………………………………………………0.3V到+6.0V所有其他输入(注解1)………………………………………………-0.3V到(Vcc+3.0V)输入电流:Vcc………………………………………………………………………………20mAGND……………………………………………………………………………20mA输出电流(所有输出)………………………………………………………………20mAESD额定值…………………………………………………………………………2kV电源持续功耗:塑料DIP(70℃以上时,9.09mW/℃递减)………………………………………727mWSO(70℃以上时,5.88mW/℃递减)……………………………………………471mWMiniSO(70℃以上时,4.10mW/℃递减)………………………………………330mW正常工作温度范围……………………………………………………-65℃到160℃焊接温度(焊接10秒)………………………………………………………+300℃24.规范SP70_P/R的Vcc范围为2.7V到5.5V,SP70_S的Vcc范围为3.0到5.5V,SP70_T的Vcc范围为3.15V到5.5V,TA=TMIN到TMAX,除非有特别说明,一般以上数据皆以25℃时为准。参数最小值典型值最大值单位条件操作电压范围,Vcc1.05.5V电源电流,ISUPPLY2540μAMR=Vcc或浮空,WDI浮空复位阈值2.552.853.002.632.933.082.703.003.15VSP70_P/RSP70_SSP70_T复位阈值滞后20mV注解2复位脉冲宽度,tRS140200280ms注解2RESET输出电压VOHVOLVOHVOL0.8xVccVcc-1.50.30.4VVRST(MAX)Vcc3.6V,ISOURCE=500uAVRST(MAX)Vcc3.6V,ISINK=1.2mA4.5VVcc5.5V,ISOURCE=800uA4.5VVcc5.5V,ISINK=3.2mARESET输出电压VOHVOLVOHVOLVCC-0.6VCC-1.50.30.4VVRST(MAX)Vcc3.6V,ISOURCE=215uAVRST(MAX)Vcc3.6V,ISOURCE=1.2mA4.5VVcc5.5V,ISOURCE=800uA4.5VVcc5.5V,ISOURCE=3.2mA看门狗溢出周期,tWD1.001.602.25sVcc3.6VWDI脉冲宽度,tWP50nsVIL=0.4V,VIH=0.8xVccWDI输入阈值VILVIHVILVIH0.7xVcc3.50.60.8VVRST(MAX)Vcc3.6VVRST(MAX)Vcc3.6VVcc=5.0VVcc=5.0VWDI输入电流-10.021uAWDI=0或Vcc3续上表参数最小值典型值最大值单位条件WDO输出电压VOHVOLVOHVOL0.8xVccVcc-1.50.30.4VVRST(MAX)Vcc3.6V,ISOURCE=500uAVRST(MAX)Vcc3.6V,ISINK=1.2mA4.5VVcc5.5V,ISOURCE=800uA4.5VVcc5.5V,ISINK=3.2mAMR上拉电流2510070250250600uAMR=0V,VRST(MAX)Vcc3.6VMR=0V,4.5VVcc5.5VMR脉冲宽度,tMR500150nsVRST(MAX)Vcc3.6V4.5VVcc5.5VMR输入阈值VILVIHVILVIH0.7xVcc2.00.60.8VVRST(MAX)Vcc3.6VVRST(MAX)Vcc3.6V4.5V
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