[参考译文] MSPM0G3507：VREF 电压的配置

采样保持模式支持在 STANDBY 工作模式下运行 VREF、因此如果您需要使外设的 VREF 处于超低功耗模式、可以使用这种模式。 如果您想启用采样保持功能、一种配置采样保持功能的更简单方法是通过 SysConfig。 我从 SysConfig GUI 中概述了这些参数。 如果您只想使用内部/外部 Vref 而不进行采样保持、您也可以在 SysConfig 中启用它。

The recommended sample time is >30us waiting for VREF to stabilize.

    The timing is calculated as:

            Sample_time =Sample_cycles/VREF_Clock

            Where:
                VREF_Clock = VREF_Clock_Source/VREF_Clock_Divider
                (See Clock Configuration section for more details).

                Sample_cycles = 0 to 65535.

            If VREF_Clock is 32.768kHz (i.e. LFCLK), and Sample_cycles = 1, the resulting Sample_time will be ~30.51us.

Hold time should be such that the accuracy degradation due to leakage is within
    DAC acceptable limits. The recommended hold time is 6ms.

    The timing is calculated as:

            Hold_time = Hold_cycles / VREF_Clock

            Where:
                VREF_Clock = VREF_Clock_Source/VREF_Clock_Divider
                (See Clock Configuration section for more details).

                Hold_cycles = 0 to 65535.

            If VREF_Clock is 32.768kHz (i.e. LFCLK), and Hold_cycles = 197, the resulting Sample_time will be ~6.01ms.