本帖最后由 cooldog123pp 于 2016-12-25 00:16 编辑
在介绍了板卡相关硬件后,那当然要进行一些些小小的测试,此贴就分享一下板卡在相关低功耗模式下的功耗吧。
首先,介绍下到底有哪几种低功耗模式,分别是什么状态:
1.低功耗模式包含: - Sleep Mode
- STOP mode with RTC
- STANDBY mode without RTC and BKPSRAM
- STANDBY mode with RTC
- STANDBY mode with RTC and BKPSRAM
2.低功耗模式描述:
- Sleep Mode
============
- System Running at PLL (216MHz)
- Flash 5 wait state
- Instruction and Data caches ON
- Prefetch OFF
- Code running from Internal FLASH
- All peripherals disabled.
- Wakeup using EXTI Line (USER Button on PA.0 pin)
- STOP Mode
===========
- RTC Clocked by LSI
- Regulator in LP mode
- HSI, HSE OFF and LSI if not used as RTC Clock source
- No IWDG
- FLASH in deep power down mode
- Automatic Wakeup using RTC clocked by LSI (after ~20s)
- STANDBY Mode
==============
- Backup SRAM and RTC OFF
- IWDG and LSI OFF
- Wakeup using WakeUp Pin (USER Button on PA.0 pin)
- STANDBY Mode with RTC clocked by LSI
==========================================
- RTC Clocked by LSI
- IWDG OFF and LSI OFF if not used as RTC Clock source
- Backup SRAM OFF
- Automatic Wakeup using RTC clocked by LSI (after ~20s)
- STANDBY Mode with backup SRAM ON
======================================================
- RTC Clocked by LSI
- IWDG OFF and LSI OFF if not used as RTC Clock source
- Backup SRAM ON
- Automatic Wakeup using RTC clocked by LSI (after ~20s)
3.怎么接线
首先看下,非低功耗模式下,5V输入,带屏幕,程序是出厂自带时候的功耗如何:
找到板子上5V和GND,插上插针,把鳄鱼夹加上,
调节到DC5V输出,
可以实际工作电压为394mA左右
要测试芯片低功耗,肯定是看电流,我想到的办法是把万用表当做电流表串接到整个电路中去,从原理图可知,只要把R109焊掉,把JP4用插针焊接出来,如下图所示:
万用表接线图晒一张:
接下来,就是要demo固件里面的低功耗测试程序PWR_CurrentConsumption,
测试STANDBY mode with RTC and BKPSRAM模式,如图:
宏定义打开,编译下载程序,
实际电流,如图,为4.3uA
测试STANDBY mode with RTC模式,如图:
宏定义打开,编译下载程序,
实际电流,如图,为3.5uA,
测试STANDBY mode without RTC and BKPSRAM模式,如图:
宏定义打开,编译下载程序,
实际电流,如图,为2.9uA,
测试STOP mode with RTC模式,如图:
宏定义打开,编译下载程序,
实际电流,如图,为158uA,
测试Sleep Mode模式,如图:
宏定义打开,编译下载程序,
实际电流,如图,为24.66mA,
由此可见,STM32F769I的低功耗模式丰富,且实际参数也很给力,值得信赖~~
PS:仪器简陋多多包涵,方法也有点土,有机会改进~~
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