为什么供电以后DAC的ERRB引脚会始终处于一个低电平的状态呢,此时并没有写入数据,ERRB已经外接上拉电阻
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你好!
DAC161S997的datasheet中关于8.3.1.2中介绍了SPI Timeout Error,如果在规定的SPI Timeout(默认值100ms)时间内没有接收到写入命令,就会将ERRB脚拉低,所以会始终保持一个低电平的状态。
恩是的,给正确的写操作之后,再看下是否ERRB还会拉低。
Timeout error或者Frame error都会将ERRB拉低。