DSADC

Measure voltage of analog input pin using delta-sigma conversion

Since R2023b

• 

Libraries:
Embedded Coder Support Package for Infineon AURIX TC4x Microcontrollers / AURIX TC4x

Description

The DSADC block measures the voltage of an analog input pin using delta-sigma conversion.

It outputs the voltage as a single-precision floating-point number, unsigned, or signed 16-bit count formatted as an N-by-1 array. The delta-sigma conversion process can utilize either the on-chip modulator or the external modulator, which you select in the DSADC Peripheral Configuration tool. The block provides the conversion results continuously based on the filter parameters that you specify when configuring the DSADC peripheral in the Hardware Mapping tool.

Ports

Output

result — Voltage of analog input pin

scalar | vector

When you set the Result type parameter to Voltage, the block outputs the measured voltage as a single-precision floating-point number. When you set the Result type parameter to Counts, the block outputs the voltage as a 16-bit count formatted as an N-by-1 array, where N varies based on the parameter values, as shown in this table.

Read Mode	FIFO	Timestamp	Valid FIFO Level	Size of Result
Number of 16-bit data to read: 1	Disable	Disable	Stage 1	1-by-1
	Enable	Disable	Stage 1	1-by-1
			Stage 2	2-by-1
			Stage 3	3-by-1
			Stage 4	4-by-1
		Enable	Stage 2	1-by-1
			Stage 3	2-by-1
			Stage 4	3-by-1
Number of 16-bit data to read: 2	Enable	Disable	Stage 2	2-by-1
			Stage 4	4-by-1
		Enable	Stage 4	3-by-1

Data Types: uint16 | int16 | single

aux_result — Auxiliary result of conversion

scalar

The block outputs the auxiliary result as a 16-bit signed value or a single-precision floating-point number, depending on the choice of Result type parameter. Use this port to obtain to obtain immediate result of conversion, bypassing the offset and integrator filter stages during conversion.

Dependencies

To enable this port, select the Auxiliary Result parameter.

Data Types: int16 | single

timestamp — Timestamp of 16-bit counter value

scalar

The block outputs the current value of the 16-bit timestamp counter.

Dependencies

To enable this port, select the Enable timestamp parameter.

Data Types: uint16 | int16

Parameters

Enable timestamp — Option to enable timestamp output

off (default) | on

Select to enable the timestamp.

When you select the Enable timestamp parameter, the block configures an additional output port, timestamp.

Selection of this parameter enables options in the Timestamp tab and Timestamp event (under Events tab) in the DSADC Peripheral Configuration.

Note

Configure the trigger signal before selecting the Enable timestamp parameter, since the timestamp is always associated with a trigger signal. Otherwise, the FIFO functionality does not work, as timestamp is flushed into FIFO first and then to the result registers.

Auxiliary Result — Enable the auxiliary result as additional output

off (default) | on

Select this parameter to enable the aux_result output port. The block outputs the auxiliary result as a single-precision floating-point number or a signed 16-bit value.

Selection of this parameter enables the related parameters in the DSADC Peripheral Configuration.

Enable FIFO — Option to enable FIFO register

off (default) | on

Select this parameter to enable the FIFO register.

Enabling this parameter results in the addition of two new parameters – Number of 16 bit data to read and FIFO Level.

Number of 16 bit data to read — Number of 16 bit data to read

1 (default) | 2

Number of 16 bit data to read.

Specify 2 to fetch the data faster from the FIFO register.

FIFO Level — Level of FIFO

4 (default) | 3 | 2 | 1

Level of the FIFO register for data transfer.

The option 1 appears if you disable Enable Timestamp

Result type — Type of the conversion result

Counts (default) | Voltage

Specify the type of the output at the result port.

Main result type — Data type of the result

Signed (default) | Unsigned

Specify the data type of the output at result port.

Dependencies

To enable this parameter, set the Result type parameter to Counts.

Sample time — Frequency at which block reads input analog pin(s)

-1 (default) | scalar

Specify in seconds how often the block should read the analog pin(s).

When you specify this parameter as -1, Simulink^® determines the best sample time for the block based on the block context within the model.

Version History

Introduced in R2023b