DAC8563 SPI连接问题

您好！

     我现在要用4路DAC，现在想用两片DAC8563，我想请教一下，这两片DAC8563的DIN和SCLK可以并联起来用吗？就是两个芯片的SCLK连接在一起，DIN连接在一起，使用MCU上面的一个SPI口，而SYNC、LDAC、CLR，分配单独的I/0口；

user151383853：

这需要一个nss 信号.从芯片的引脚看,也只有 SYNC 这个引脚有可能, 看手册
Level-triggered control input (active-low). This input is the frame synchronization signal for the input data. When SYNC goes low, it enables the input shift register, and data are sampled on subsequent falling clock edges. The DAC output updates following the 24th clock falling edge. If SYNC is taken high before the 23rd clock edge, the rising edge of SYNC acts as an interrupt, and the write sequence is ignored by the DAC756x, DAC816x, and DAC856x devices. Schmitt-trigger logic input
看样子单独控制这个信号,那么楼主的功能要求是可能的

user4849316：

回复 user151383853:

Airwill这需要一个 nss 信号. 从芯片的引脚看, 也只有 SYNC 这个引脚有可能, 看手册 Level-triggered control input (active-low). This input is the frame synchronization signal for the input data. When SYNC goes low, it enables the input shift register, and data are sampled on subsequent falling clock edges. The DAC output updates following the 24th clock falling edge. If SYNC is taken high before the 23rd clock edge, the rising edge of SYNC acts as an interrupt, and the write sequence is ignored by the DAC756x, DAC816x, and DAC856x devices. Schmitt-trigger logic input看样子单独控制这个信号, 那么楼主的功能要求是可能的

Amy Luo：

您好，
根据数据手册的描述SYNC应该是可以作为DAC8563的片选信号的，四路DAC可以选择4路DAC的芯片，看下DAC8564、DAC8565。