[技术文档] 分享:航顺芯片，航顺MCU,RTC PC13 推挽输出时会影响LSE 精度。

RTC PC13 推挽输出时会影响LSE 精度。

描述：
当RTC 使用LSE 作为时钟，并使用PC13 作为信号输出时。每次输出的上升沿(如下图)， 都会有干扰耦合到LSE 上，导致LSE 多产生一次时钟。进而导致RTC 计
时不准。同样， 秒脉冲输出和闹钟输出时都会有同样的影响。
//例如，
当RTC calibration 按照64 分频输出512Hz 信号时，实际会因为这个原因输出520Hz 左右。偏差约1.5%。

 

*0: 512Hz 输出1: 32K LSE
当RTC calibration 输出1Hz 秒脉冲时， 会偏差1/32768 = 30.5ppm。这个偏差只会在Calibration 输出时有， 关闭输出后， LSE 精度恢复正常。
这会导致Calibration 不准。

解决方案：
(硬件解决方案) :
在PC13 上对VBAT 脚并连一个>=103(0.01uF)的电容. 会略微改变输出边沿.
 

航顺芯片MCU型号选型表，料号

HK32F030MF4U6，HK32F030MD4P6，HK32F030MJ4M6，HK32F030MG6U6A，HK32F030MF4U6A，HK32F030MD4P6A，HK32F030MJ4M6A，HK32F0301MF4U6，HK32F0301MD4P6，HK32F0301MJ4M6，HK32F0301MG6U6A，HK32F0301MF4U6A，HK32F0301MD4P6A，HK32F0301MJ4M6A，HK32E032R4T5，HK32F04AR8T6，HK32F04AC8T6，HK32F04AC6T6，HK32F04AC4T6，HK32F04AK8T6，HK32F04AK6T6，HK32F04AK4T6，HK32F04AK8U6，HK32F04AK6U6，HK32F04AK4U6，HK32F04AG8U6，HK32F04AG6U6，HK32F04AG4U6，HK32F04AF8P6，HK32F04AF6P6，HK32F04ARBT6A，HK32F04AR8T6A，HK32F04ACBT6A，HK32F04AC8T6A，HK32F04AC6T6A，HK32F04AC4T6A，HK32F04AKBT6A，HK32F04AK8T6A，HK32F04AK6T6A，HK32F04AK4T6A，HK32F04AKBU6A，HK32F04AK8U6A，HK32F04AK6U6A，HK32F04AK4U6A，HK32F04AGBU6A，HK32F04AG8U6A，HK32F04AG6U6A，HK32F04AG4U6A，HK32F04AFBP6A，HK32F04AF8P6A，HK32F04AF6P6A，HK32F04AF4P6A，HK32ASPIN010RBT6，HK32ASPIN010CBT6，HK32ASPIN010KBT6，HK32ASPIN010KBU6，HK32ASPIN010GBU6，HK32ASPIN010FBP6，HK32ASPIN010RBT6A，HK32ASPIN010CBT6A，HK32ASPIN010KBT6A，HK32ASPIN010KBU6A，HK32ASPIN010GBU6A，HK32ASPIN010FBP6A，HK32ASAFE010RBT6，HK32ASAFE010CBT6，HK32ASAFE010KBT6，HK32ASAFE010KBU6，HK32ASAFE010GBU6，HK32ASAFE010FBP6，HK32U3019VET6，HK32U3019VDT6，HK32U3019VCT6，HK32U3019RET6，HK32U3019RDT6，HK32U3019RCT6，HK32H3009VET6，HK32H3009VDT6，HK32H3009VCT6，HK32H3009RET6，HK32H3009RDT6，HK32H3009RCT6，HK32T088RBT6，HK32T088C8T6，HK32HA030RBT6，HK32HA030C8T6，HK32HP103RET6，HK32HP103RCT6，HK32HP103CET6，航顺芯片MCU型号选型表，替代ST料号，全兼容HK32F030MF4P6替代STM8S003，HK32F0301MF4P6替代STM8S003，HK32F030MG6T6A 替代STM8S003，HK32F030MF4P6A 替代STM8S003，HK32F0301MG6T6A替代STM8S003，HK32F0301MF4P6A替代STM8S003，HK32F030R8T6替代STM32F030R8T6，HK32F030C8T6替代STM32F030C8T6，HK32F030C6T6替代STM32F030C6T6，HK32F030K6T6替代STM32F030K6T6，HK32F030F4P6替代STM32F030F4P6，HK32F030R8T6A替代STM32F030R8T6，HK32F030C8T6A替代STM32F030C8T6，HK32F030C6T6A替代STM32F030C6T6，HK32F030K6T6A替代STM32F030K6T6，HK32F030F4P6A替代STM32F030F4P6，HK32F031C6T6替代STM32F031C6T6，HK32F031C4T6替代STM32F031C4T6，HK32F031K6T6替代STM32F031K6T6，HK32F031K4T6替代STM32F031K4T6，HK32F031K6U6替代STM32F031K6U6，HK32F031K4U6替代STM32F031K4U6，HK32F031G6U6替代STM32F031G6U6，HK32F031G4U6替代STM32F031G4U6，HK32F031F6P6替代STM32F031F6P6，HK32F031F4P6替代STM32F031F4P6，HK32F031C6T6A替代STM32F031C6T6，HK32F031C4T6A替代STM32F031C4T6，HK32F031K6T6A替代STM32F031K6T6，HK32F031K4T6A替代STM32F031K4T6，HK32F031K6U6A替代STM32F031K6U6，HK32F031K4U6A替代STM32F031K4U6，HK32F031G6U6A替代STM32F031G6U6，HK32F031G4U6A替代STM32F031G4U6，HK32F031F6P6A替代STM32F031F6P6，HK32F031F4P6A替代STM32F031F4P6，HK32F042RBT6替代STM32F042RBT6，HK32F042R8T6替代STM32F042R8T6，HK32F042CBT6替代STM32F042C8T6，HK32F042C8T6替代STM32F042C8T6，HK32F042CBU6替代STM32F042C8T6，HK32F042C8U6替代STM32F042C8T6，HK32F051RBT6替代STM32F051RBT6，HK32F051R8T6替代STM32F051R8T6，HK32F051CBT6替代STM32F051C8T6，HK32F051C8T6替代STM32F051C8T6，HK32F051CBU6替代STM32F051C8T6，HK32F051C8U6替代STM32F051C8T6，HK32F072RBT6替代STM32F072RBT6，HK32F072R8T6替代STM32F072R8T6，HK32F072CBT6替代STM32F072C8T6，HK32F072C8T6替代STM32F072C8T6，HK32F072CBU6替代STM32F072C8T6，HK32F072C8U6替代STM32F072C8T6，HK32F072RBT6A替代STM32F072RBT6，HK32F072R8T6A替代STM32F072R8T6，HK32F072CBT6A替代STM32F072C8T6，HK32F072C8T6A替代STM32F072C8T6，HK32F072CBU6A替代STM32F072C8T6，HK32F072C8U6A替代STM32F072C8T6，HK32F103RBT6替代STM32F103RBT6，HK32F103R8T6替代STM32F103R8T6，HK32F103CBT6替代STM32F103CBT6，HK32F103C8T6替代STM32F103C8T6，HK32F103VBT6A替代STM32F103VBT6，HK32F103V8T6A替代STM32F103V8T6，HK32F103RBT6A替代STM32F103RBT6，HK32F103R8T6A替代STM32F103R8T6，HK32F103CBT6A替代STM32F103CBT6，HK32F103C8T6A替代STM32F103C8T6，HK32F103VET6替代STM32F103VET6，HK32F103VDT6替代STM32F103VDT6，HK32F103VCT6替代STM32F103VCT6HK32F103RET6替代STM32F103RET6，HK32F103RDT6替代STM32F103RDT6，HK32F103RCT6替代STM32F103RCT6，HK32W030CEU6替代NRF52832，HK32U1009VET6替代HK32F103VET6，HK32U1009VDT6替代HK32F103VDT6，HK32U1009VCT6替代HK32F103VCT6，HK32U1009RET6替代HK32F103RET6，HK32U1009RDT6替代HK32F103RDT6，HK32U1009RCT6替代HK32F103RCT6，
出处：103应用笔记