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TMS320F280033: 内部温度测量的问题(Question about measuring internal temperature)

Part Number: TMS320F280033

相同型号的DSP,在2种不同的电路板上,采用同样的计算代码,计算出来的温度值相差太大。

上图中,Board1和Board2是同一种电路板;Board3和Board4是另外一种电路板

VREF_3.3是指DSP模拟量采样参考电压,即VREFHI和VREFLO之间电压

AD是DSP读取的AD采样原始值

TSOFFSET是0x701C9地址处的int16值

TSSLOPE是0x701C8地址处的int16值

T_Calc是用Excel按照driverlib种算法计算出的值

显示值是DSP实际计算出的值

ADC采用外部参考电压

请问,为什么温度会有如此大的偏差?