ADC Type 3-5

Configure ADC to sample analog pins and output digital data

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Libraries:
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
C2000 Microcontroller Blockset / F28p65x
C2000 Microcontroller Blockset / F28p55x

Description

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.

Examples

Photovoltaic Inverter with MPPT Using Solar Explorer Kit

Implement a photovoltaic (PV) inverter system using the C2000™ Microcontroller Blockset. The example uses the Texas Instruments Solar Explorer Kit along with the Texas Instruments F28035 controlCARD.

• Open Model

Ports

Output

Data — ADC data

vector

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

Data Types: uint16

Parameters

SOC Trigger

ADC Module — Select module to use

A (default) | B | A and B

Select ADC Module 1 or ADC Module 2 for conversion.

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

Note

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

ADC Resolution — Select 12 bit or 16 bit resolution

A (default) | B | A and B

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.

Note

• This parameter is supported only for Texas Instruments C2000 F2837xD, F2838x, F2837xS, and F28p55x processors.

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

Sampling mode — Select sampling type

Single (default) | Simultaneous

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.

Note

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

SOC trigger number — Start of conversion number

SOC0 (default) | SOC1 | SOC2 | …

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.

SOCx acquisition window — Length of the acquisition period

7 (default) | 8 | ...

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.

SOCx trigger source — Source that triggers the start of conversion

Software (default) | EVA | External pin

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.

Note

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

ADCINT will trigger SOCx — Use ADC interrupt to trigger SOC

No ADCINT (default) | ADCINT1 | ADCINT2

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.

Sample time — Interval at which block reads data

0.1 (default)

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.

Data type — Select the output data type

uint16 (default) | double | single | int8 | uint8 | int16 | int32 | uint32

Date type of the output data.

Post interrupt at EOC trigger — Post interrupts when ADC triggers

Off (default) | on

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.

Note

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

Interrupt selection — ADC interrupt selection

ADCINT1 (default) | ADCINT2

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

Dependencies

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

ADC# continuous mode — Generate ADC interrupt

ADCINT1 (default) | ADCINT2

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

Dependencies

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

Input channels

Conversions channel — Select ADC channel to which this ADC conversion applies

ADCINA0 (default) | ADCINA1 | ADCINA2 | …

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.

Tips

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.

GPIO	ADC		CMPSS
	Module	Channel	Module	Input
GPIO12	A	20
	C	20
GPIO13	A	19
	C	19
GPIO20	A	17
	C	17
GPIO21	A	18
	C	18
GPIO28	A	16
	C	16
GPIO224	A	2	1	Positive
	C	9
GPIO226	C	6	3	Positive
GPIO227	A	9	2	Positive
	C	8	4	Positive
GPIO228	A	6	1	Positive
GPIO230	A	10	2	Negative
	C	10
GPIO242	A	3	3	Negative
	C	5

For TI F28P65x processors the following tables provides the mapping of GPIO pins which can be used as the analog pins for ADC and CMPSS blocks.

GPIO	ADC		CMPSS
	Module	Channel	Module	Input
GPIO198	B	31	11	Positive
	C	7
GPIO199	B	24	6	Positive
	C	0	6	Negative
GPIO200	B	25	6	Positive
	C	1
GPIO201	C	9	11	Positive
GPIO202	C	8	10	Positive
GPIO203	B	30	10	Positive
	C	6
GPIO204	B	25	2	Positive
	C	9	5	Negative
GPIO205	B	28	5	Positive
	C	4	10	Negative
GPIO206	B	27	3	Positive
	C	3	6	Negative
GPIO207	A	30	7	Positive
	B	6	7	Negative
GPIO208	A	31	3	Negative
	B	7	7	Positive
GPIO209	A	6	7	Positive
GPIO210			4 and 9	Positive
	A	7	7	Negative
GPIO211	A	8	8	Positive
	C	24
GPIO212	A	9	5	Positive
	C	25	8	Negative
GPIO213	A	10	8	Positive
	C	26	8	Negative
GPIO214	A	11	8	Positive
	C	27
GPIO215	A	28	5	Positive
	B	4	5	Negative
GPIO216	A	25	5	Positive
	B	5
GPIO217	B	8	2	Positive
	C	28	10	Negative
GPIO218	B	9	2	Positive
	C	29	9	Negative
GPIO219	B	10	4	Positive
	C	30	4	Negative

These pins are configured as analog pins if ADC or CMPSS blocks utilize them. Ensure that a GPIO pin is not used as both digital and analog pin. For example, if GPIO12 cannot be used in digital input or digital output block and as ADCA input channel 20.

Version History

Introduced in R2016b