SPRUJ73 December   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
      1. 1.1.1 Read This First
        1. 1.1.1.1 Sitara MCU+ Academy
        2. 1.1.1.2 Important Usage Notes
    2. 1.2 Kit Contents
  6. 2Hardware Description
    1. 2.1 Component Identification
    2. 2.2 Power Requirements
      1. 2.2.1 Power Input Using USB Type-C Connector
      2. 2.2.2 Power Status LEDs
      3. 2.2.3 Power Tree
    3. 2.3 Functional Block Diagram
    4. 2.4 Header Information
    5. 2.5 Interfaces
      1. 2.5.1 ADC
      2. 2.5.2 LIN
      3. 2.5.3 MCAN
      4. 2.5.4 TRACE/GPMC Muxing Scheme
      5. 2.5.5 GPMC Memory Interface
        1. 2.5.5.1 PSRAM
        2. 2.5.5.2 GPMC Memory Footprint
        3. 2.5.5.3 NOR FLASH
      6. 2.5.6 TI 14-Pin Header
      7. 2.5.7 MIPI-60 Connector
    6. 2.6 HSEC Pinout
  7. 3Additional Information
    1. 3.1 If You Need Assistance
    2.     Trademarks
  8. 4References
    1. 4.1 Reference Documents
    2. 4.2 Other TI Components Used in This Design
  9. 5Revision History

2.5.1 ADC

GUID-20230111-SS0I-SGHL-9WXV-CPJRBLFLJ7SX-low.png Figure 2-7 Variable ADC Inputs with Signal Conditioning

The AM263x controlCARD Docking Station is equipped with variable resistors to control the input voltage for ADC channels ADC0_AIN0 and ADC0_AIN1 on the AM263x SoC. Each of these channels is also equipped with an OPA2837IDGKT voltage feedback amplifier for signal conditioning along the ADC input lines. The table below shows the configuration options for these ADC input channels.

Table 2-11 ADC Jumper Placement
ADC Channel Header Jumper Placement ADC Input Path
ADC0_AIN0 J18 No jumper Potentiometer disconnected from ADC input
Pins 2-3 (default) Potentiometer connected to OPA2837IDGKT
Pins 1-2 Potentiometer directly connected to ADC channel input
J65 No jumper Op amp disconnected from ADC input
Pins 1-2 Op amp connected to ADC channel input
ADC0_AIN1 J22 No jumper Potentiometer disconnected from ADC input
Pins 2-3 (default) Potentiometer connected to OPA2837IDGKT
Pins 1-2 Potentiometer directly connected to ADC channel input
J66 No jumper Op amp disconnected from ADC input
Pins 1-2 Op amp connected to ADC channel input

To use the full potentiometer and op-amp signal conditioning path for ADC0_AIN0, a jumper is placed across pins 2 and 3 on J18, and a jumper is placed on pins 1 and 2 on J65. Likewise, for ADC0_AIN1, a jumper is placed across pins 2 and 3 on J22, and a jumper is placed on pins 1 and 2 on J66.

To connect the potentiometer directly to the ADC channel input, a jumper is placed across pins 1 and 2 on J18 and/or J22.