ads8568使用问题

Henry Le

Prodigy 60 points

软件设置，并口。内部参考电压。REFIO 和 REFN 引脚通过0.47uF电容，REFN接地。配置寄存器为0X8C0083FF。

BUSY引脚监测读取数据，数据不正确。测量REFIO引脚电压为0.

看手册，REFIO引脚应该是内部参考的输出啊。请问哪儿出问题了。

11 年多前

0 user151383853 11 年多前

Guru 63421 points

手册上:

REFIO Reference voltage input/output.
The internal reference is enabled by the REFEN/WR pin in hardware mode or by CONFIG bit C15 (REFEN) in software mode. The output value is controlled by the internal DAC (CONFIG bits C[9:0]). Connect to a decoupling capacitor according to the Power Supply section.

The reference feeds a 10-bit string-DAC controlled by bits REFDAC[9:0] in the Configuration (CONFIG) Register. The buffered DAC output is connected to the REFIO pin.

看样子设置是对的. 再查查硬件方面的问题吧