上电默认输出高电平, 最好加个上拉电阻来实现. 不过我关注的问题是:
However, the serial register of the DAC8830 and DAC8831 is not cleared on power-up, so its contents are undefined. When loading data initially to the device, 16 bits or more should be loaded to prevent erroneous data appearing on the output.
就是说, 上电的寄存器值不确定. |
