• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 82 subscribers
  • Views 485 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Concerto ADCs

Damon Stokes
Prodigy 120 points

Following up on http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/p/164857/712692.aspx, I am assuming that the ADC channels shown as tied to each other in Figure 11-1 in SPRUH22B are still tied together internally on the F28M35 (i.e. ADC1INA0 is connected internally to ADC2INA1, ADC1INA1 is connected internally to ADC2INA0, etc.), just that only 10 of the channels on each ADC are brought out to pins on this device. Is this correct (i.e. would performing on ADC conversion on ADC1INA1 give the same result as ADC2INA0, the voltage on pin 132 of the device)? Thanks.

  • 0
    TI__Guru 64820 points

    When you mention "this device", which specific device part number are you referring to?  The Technical Reference Manual is applicable to all devices in the Concerto series, but specific capabilities on a particular device would be described in the specific device datasheet.

  • 0 in reply to BrandonAzbell
    Prodigy 120 points

    The device I was referring to is the F28M35H52C1. Figure 5-3 in SPRS742B shows ADC_INA1 and ADC_INB1 as not connected, which seems to contradict the technical reference manual (SPRUH22B figure 11-1).

  • 0 in reply to Damon Stokes
    TI__Guru 64820 points

    I can understand the thinking behing a potential conflict, but hopefully I can help clear this up.  The Technical Reference Manual describes the functionality and features of the peripherals and internal struction of the Concerto class of devices.  The ADC subsystem supports up to 16 channels which is reflected in the TRM.  However, a particular device may propagate a subset of those channels to device pins.  There are a number of reasons for this, but one is the availability of pins given the package the device is in.

    The device datasheet indicates what is actually physically on a given device and the supported pinout.  In Section 2.5.1 and 2.5.2 of the F28M35H52C1 datasheet, it indicates that 10 of the 16 channels are actually pinned out.

  • 0 in reply to BrandonAzbell
    Prodigy 120 points

    Thanks for your response, Brandon. I understand that only 10 of the 16 channels are pinned out; my question was concerning whether or not the internal channels are connected to each other as mentioned in the technical reference manual (i.e. is ADC1INA0 connected internally to ADC2INA1).

  • 0 in reply to Damon Stokes
    TI__Guru 64820 points

    Figure 11-1 of the Concerto F28M35x Technical Reference Manual describes how the ADC channels are hooked up internally, which is independent of how a specific device is pinned out.  You are correct, ADC1INA0 is connected to the same internal node as ADC2INA1.  Similar is true of ADC1INA1 and ADC2INA0, ADC1INB0 and ADC2INB1, ADC1INB1 and ADC2INB0.