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Analog to Digital Converter Type 1 FAQ for C2000

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Introduction

This topic is a list of frequently asked questions that users have when using the Analog to Digital Converter of type 1. ADC type 1 is the 2nd generation ADC module released for the C28x devices. ADC type 1 is found on the 280x family which includes 2801, 2802, 2806, 2808, 2809, 28015, 28016, 28044.

Electrical Specifications

Electrical specifications can change between devices, peripheral types and device families. Always refer to the data manual and errata for a particular device for Electrical Specifications.

This page is obsolete and no longer maintained. Refer to C2000 Real-Time Control Peripherals Reference Guide (spru566m) for peripheral type information.

--Lheustess (talk) 15:00, 27 July 2018 (CDT)


Frequently asked questions for ADC Type 1

Q: I measured ADCREFP and ADCREFM. In the datasheet only a typical value is specified not a min/max. How can I tell if my device is in spec?

These signals are internally generated voltages for use by the internal ADC only. These are fully tested at by TI at production time and will not be out of spec for the device. The only reason these signals are brought outside the device is for external bulk cap. The Data Manual values are only there to give a ballpark of where the voltages will be and this is why there is no max/min.

Q: What’s the difference of SEQ1INT, SEQ2INT and ADCINT? When would SEQ1INT can be triggerd?

SEQ1INT and SEQ2INT are the end-of-sequence interrupts for ADC sequencers #1 and #2 respectively. ADCINT is legacy for backwards compatibility with 281x device, and is triggered by both SEQ1 or SEQ2 on end-of-sequence. In the ADCINT ISR, software would check the sequencer flags to determine which sequencer triggered the interrupt. SEQ1INT and SEQ2INT eliminate the need to do this.

Q: Can I calibrate this ADC?

Yes - please refer to the application note:

Q: The 2833x/2823x devices have an on-chip ADC_cal() function. Is this available on 280x?

No, but calibration can still be achieved - please refer to the application note:

Q: Looking at the calibration app note it appears that you need to physically connect an ADC channel to ground. Is there a way to configure an internal connection to GND for calibration purposes?

There is no way to connect the GND to a pin internally for calibration.