Reference control and status register (SYSCFG_CFGR3) 这个控制寄存器里有个bit：
ENBUF_SENSOR_ADC: Temperature sensor reference for ADC enable bit
This bit is set and cleared by software (only if REF_LOCK not set). When this bit is set, the
VREFINT is automatically enabled.
0: Disables the buffer used to generate VREFINT reference for the temperature sensor.
1: Enables the buffer used to generate VREFINT reference for the temperature sensor
这个the buffer如何理解，比方说使能了，是不是 the temperature sensor的ad采样值的参考电压就是vrefint，但实际实际好像不是这样，即便使能了
ad参考电压依然是vdda
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ENBUF_SENSOR_ADC: Temperature sensor reference for ADC enable bit
This bit is set and cleared by software (only if REF_LOCK not set). When this bit is set, the
VREFINT is automatically enabled.
0: Disables the buffer used to generate VREFINT reference for the temperature sensor.
1: Enables the buffer used to generate VREFINT reference for the temperature sensor
这个the buffer如何理解，比方说使能了，是不是 the temperature sensor的ad采样值的参考电压就是vrefint，但实际实际好像不是这样，即便使能了
ad参考电压依然是vdda