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ads1247 ads1147等vrefout 脚上电就有2.0v左右电压么?

Other Parts Discussed in Thread: ADS1147, ADS1247

 按照datasheet clk脚接地。  ads1247 ads1147等vrefout 脚上电就有2.0v左右电压么? 我焊接了好几块,线路就接3.3v和地,

vrefout脚是需要软件初始化设置后才有电压还是什么?

我用

ADS124x_WREG( ADS124x_REG_MUX1 );
ADS124x_WCMD( 0 );
ADS124x_WCMD( DEF_BINARY_0010_0000);  

bit  6 5位为 01时 internal reference is always on。  设置后vrefout还是没有电压。

求救。。。。