14.1 AIN Extended Features [T-Series Datasheet]

Available AIN Extended Features

For any given AIN channel, one AIN-EF feature may be selected. AIN-EF indices:

AIN-EF Usage

To use any AIN-EF:

1. Set the EF_INDEX to select an extended feature
2. Configure the extended feature using the EF_CONFIG registers
3. Configure normal AIN configurations through the normal AIN registers. For AIN-EF modes that perform stream internally, configure AIN for stream.
4. Read from READ_A to perform the extended feature operation
5. Read additional results from B, C, and D

For a quick example of setting up an AIN-EF in thermocouple mode, see Configuring & Reading a Thermocouple.

1. Set the AIN#_EF_INDEX to select an extended feature

Write to AIN#(0:14)_EF_INDEX or AIN_ALL_EF_INDEX to select the AIN extended feature. 

2. Configure the extended feature using the AIN#_EF_CONFIG registers

Each AIN-EF index requires different configuration parameters, so the meaning of the AIN#_EF_CONFIG registers depend on which AIN#_EF_INDEX is set.

3. Configure normal AIN configurations through the normal AIN registers

Analog input range, resolution, settling, and negative channel settings are configured through the normal AIN registers.

AIN-EF modes that perform stream internally may need to configure AIN for stream.

4. Read from AIN#_EF_READ_A to perform the extended feature operation

Only reading AIN#_EF_READ_A will trigger the selected AIN-EF operation. The AIN#_EF_READ_A result is returned. Additional results are saved for later retrieval.

If the AIN-EF index uses stream-burst, reading AIN#_EF_READ_A will block for the length of time it takes to collect the necessary samples.

5. Read additional results B, C, and D

Reading from result registers other than AIN#_EF_READ_A will read the saved values and will not initiate a new reading.