AFE4403: SPI总线挂载了两个设备，其中一个是AFE4403，我发现4403的SPI通讯正常，另一个SPI设备通讯不上，我把4403拆掉后，另一台SPI设备就能正常通讯了。

jony wang

Part Number: AFE4403

你好，我们现在SPI总线挂载了两个设备，一个是AFE4403，另一个是另一个SPI设备，我发现4403的SPI通讯正常，另一个SPI设备通讯不上，我把4403拆掉后，另一台SPI设备就能正常通讯了，我查数据手册，发现了这个地方，我按照要求的设置也不行，这是我关闭代码的时候的设置。

    Disable_AFE44xx_SPI_Read();
    AFE44xx_Reg_Write((uint8_t)CONTROL3, 0x0001 | SOMI_TRI |CLKOUT_TRI);
    AFE44xx_Reg_Write((uint8_t)CONTROL2, AFE44xx_Current_Register_Settings[35] | DIGOUT_TRISTATE_ENABLE);
    Enable_AFE44xx_SPI_Read();

13 天前

0 jony wang 13 天前

Prodigy 10 points

Note that when the AFE4403 is deselected, the SPISOMI, CLKOUT, ADC_RDY, and DIAG_END digital output pins do not enter a 3-state mode. This condition, therefore, must be taken into account when connecting multiple devices to the SPI port and for power-management considerations. In order to avoid loading the SPI bus when multiple devices are connected, the SOMI_TRI register bit must be to 1 whenever the AFE SPI is inactive. The DIGOUT_TRISTATE register bit must be set to 1 to tri-state the ADC_RDY and DIAG_END pins. The CLKOUT_TRI register bit must be set to 1 to put the CLKOUT buffer in tri-state mode.