msp430f5328 进入LPM4.5后,整个板子功耗电流为0.9 ua,但该值不稳定,会逐渐增大至36.8ua,然后再从36.8ua 降低至0.9ua,
如此来回震荡,请问是什么原因?是某个GPIO 状态不稳,导致的震荡吗?
Ling Zhu2:
不用的GPIO 配置了沒有?
sun xia:
回复 Ling Zhu2:
EM4 模式下,不是所有的GPIO 寄存器内容丢失吗?如果将不用的IO口设置为输出,并输出为低电平,在进入EM4模式后该IO还会保持输出并为低电平的状态吗?还是状态消失?
sun xia:
回复 Maka Luo:
同样的GPIO配置,在进入到EM2状态下时,一直稳定保持在低功耗的状态,没有震荡,进入em4 后会出现
Maka Luo:
回复 sun xia:
LPM2 和 LPM4.5是很大的区别。
When LPMx.5 (LPM3.5 or LPM4.5) is entered, the voltage regulator of the Power Management Module(PMM) is disabled. All RAM and register contents are lost. Although the I/O register contents are lost, theI/O pin states are locked upon LPMx.5 entry. See the Digital I/O chapter for further details. Wakeup fromLPM4.5 is possible via a power sequence, a RST event, or from specific I/O. Wakeup from LPM3.5 ispossible via a power sequence, a RST event, RTC event, or from specific I/O