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ads1248读取出来的电压为0x7fffff

Other Parts Discussed in Thread: ADS1248

用ads1248测pt100,电路是按照数据手册提供的,电路图如下,我配置AIN0和AIN1输出1ma电流,采用外部基准电压,电压参考电阻我用的是1K,补偿电阻为120欧姆,我想测温度0到100度的,但是AD读出来的值一直是0x7fffff,当配置输出1ma电流是测得外部参考电压为2.02V。。。。。。