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C2802x/C2803x/C2805x/C2806x/F28M3x/F2807x/F2837xD/F2837xS/F2838x/F28004x/F2800xx ADC

Configure ADC to sample analog pins and output digital data

  • C2802x/C2803x/C2805x/C2806x/F28M3x/F2807x/F2837xD/F2837xS/F2838x/F2800xx ADC block

C2000 Microcontroller Blockset / C2802x
C2000 Microcontroller Blockset / C2803x
C2000 Microcontroller Blockset / C2805x
C2000 Microcontroller Blockset / C2806x
C2000 Microcontroller Blockset / C280x
C2000 Microcontroller Blockset / C281x
C2000 Microcontroller Blockset / C2833x
C2000 Microcontroller Blockset / F280013x
C2000 Microcontroller Blockset / F280015x
C2000 Microcontroller Blockset / F28002x
C2000 Microcontroller Blockset / F28003x
C2000 Microcontroller Blockset / F28004x
C2000 Microcontroller Blockset / F2807x
C2000 Microcontroller Blockset / F2837xD
C2000 Microcontroller Blockset / F2837xS
C2000 Microcontroller Blockset / F2838x / C28x
C2000 Microcontroller Blockset / F28M35x / C28x
C2000 Microcontroller Blockset / F28M36x / C28x


Configures the Type 3 to Type 5 ADC to output a constant stream of data collected from the ADC pins on the DSP. For more information on ADC types, refer to C2000 Real-Time Control Peripheral Reference Guide.

An ADC block allows for reading one ADC channel. Use multiple ADC blocks to read multiple ADC channels.



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The output of the ADC is a vector of uint16 values.

Data Types: uint16


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SOC Trigger

Select ADC Module 1 or ADC Module 2 for conversion.

Select ADC Module A through D for the processors that support Type 4 ADC.


The ADC Module parameter is available only for Texas Instruments C2000 processors that support Type 3, Type 4, or Type 5 ADC.

Select 12-bit (Single-ended input) or 16-bit (Differential inputs) ADC resolution options.

In 12-bit mode, only single-ended input is supported. In 16-bit mode, the input voltage to the converter is sampled through a pair of input pins, that means the differential inputs between the two channels is converted.


  • This parameter is supported only for Texas Instruments C2000 F2837xD, Texas Instruments C2000 F2838x and Texas Instruments C2000 F2837xS processors.

  • The 16-bit (Differential inputs) ADC mode is not enabled by default in most of the processors.

Type of sampling to use for the signals:

  • Single — Samples the selected channels sequentially,

  • Simultaneous — Samples the corresponding channels of modules 1 and 2 at the same time. The hardware allows each signal of a pair to be sampled at the same time.


This parameter is supported only for Texas Instruments C2000 F28M3x processors.

Identify the start-of-conversion trigger by number. In single sampling mode, you can select an individual trigger. In simultaneous sampling mode, you can select triggers in pairs.

Define the length of the acquisition period in ADC clock cycles. The value of this parameter depends on the SYSCLK and the minimum ADC sample time. The value of SOC acquisition window is subtracted by 1 and set to ACQPS field in ADC register. For more information, see the ADC Acquisition (Sample and Hold) Window section of the TMS320x2802x, 2803x Piccolo Analog-to-Digital Converter (ADC) and Comparator Reference Guide.

Select the source that triggers the start of conversion. The following types of inputs are available:

  • Software.

  • CPU Timers 0/1/2 interrupts.

  • XINT2 SOC.

  • ePWMx SOCA and SOCB.

If you set SOCx trigger source to XINT2_XINT2SOC, use the Input5 pin assignment parameter at Hardware Implementation > Target hardware resources to define the external GPIO pin that triggers the start of conversion.


The SOCx trigger source input ePWMx SOCA and SOCB range will vary according the processor selected.

At the end of conversion, use the ADCINT1 or ADCINT2 interrupt to trigger a start of conversion (SOC). This loop creates a continuous sequence of conversions. The default selection, No ADCINT disables this parameter. To set the interrupt, select the Post interrupt at EOC trigger option, and choose the appropriate interrupt.

Time in seconds between consecutive sets of samples that are converted for the selected ADC channel(s). This is the rate at which values are read from the result registers. To execute this block asynchronously, set Sample Time to -1, check the Post interrupt at the end of conversion box.

Date type of the output data.

Post interrupts when the ADC triggers EOC pulses. When you select this option, the dialog box displays the Interrupt selection and ADCINT# continuous mode options.


For new processors, the Interrupt selection provides option ADCA#, ADCB# and so on.

Select which interrupt the ADC posts after triggering an EOC pulse.


To enable this parameter, select Post interrupt at EOC trigger parameter.

When the ADC generates an end of conversion (EOC) signal, generate an ADCINT# interrupt, whether the previous interrupt flag has been acknowledged or not.


To enable this parameter, select Post interrupt at EOC trigger parameter.

Input channels

Select the input channel to which this ADC conversion applies. For Type 4 ADC, if you select 16-bit (differential inputs) mode, the differential voltage between the two channels is converted.


TMS320x2802x, 2803x Piccolo Analog-to-Digital Converter (ADC) and Comparator, Literature Number: SPRUGE5, from the Texas Instruments® Web site.

Configuration of GPIO as Analog Pins

Configuration of GPIO as Analog Pins

For TI F280013x and TI F280015x processors the following tables provides the mapping of GPIO pins which can be used as the analog pins for ADC and CMPSS blocks.


By default, these pins are made to work with the GPIO. For using these pins to work as analog input, write the following custom code using System Initialize block.

GpioCtrlRegs.GPxAMSEL.bit.GPIOy = 1U;
AnalogSubsysRegs.AGPIOCTRLx.bit.GPIOy = 1U;

For example, to use ADCA input channel 2 which can also work as GPIO224, you can use the following code.

GpioCtrlRegs.GPHAMSEL.bit.GPIO224 = 1U;
AnalogSubsysRegs.AGPIOCTRLH.bit.GPIO224 = 1U;

Version History

Introduced in R2016b