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PT100+MSP430 with 24_bit_ADC 还是PT100+ADS1220 + 单片机 ?

Other Parts Discussed in Thread: ADS1220, TIDA-00165

2路2线制PT100传感器,要求测温精度0.5度,温度范围-20~400度。打算用TI的芯片做。现在的问题:选用ADS1220一类专用芯片还是带16/24bit的Sigma-delta的MSP430单片机?个人倾向于用带Sigma-delta的MSP430单片机来做,因为系统还要处理LED数码管显示,按键检测等,反正要用一个单片机的。如果一定要选用外置的ADC,哪一个型号拿货方便价格也比较好?