"AD5940_WriteReg(REG_AFE_SWMUX, 1<< 1) " is Valid?

Hi,

In the block diagram below:

AIN2 measures RCAL impedance.

AIN3 measures Battery impedance.

REG_AFE_SWMUX[2:0] = 001; //enable common mode switch on AIN3

REG_AFE_SWMUX[2:0] = 000; //enable common mode switch on AIN2

REG_AFE_SWMUX[2:0] = 010; //disable common mode switch on both AIN2 and AIN3

Thank you for your kind and detailed reply.

But there are still some things I don't understand.

There are defined like this. 

And look at the datasheet, 





REG_AFE_SWMUX[2:0] : Reserved. 

How should I understand this part?

Hi,

Keeping [2:0] = 0x0 enable or disables both AIN2 and AIN3 common mode voltages. 

Since this is the use case for most of the applications, they are kept 0x0.

Though they are reserved, they can be R/W.

These bits[2:0] can be used for individually enabling AIN2 or AIN3 CM.

Now I understand. Thank you again.
Do you have any technical documentation related to this?

Now I understand. Thank you again.
Do you have any technical documentation related to this?