SBAU126E may   2007  – june 2023 ADS1158 , ADS1258

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1ADS1258EVM Overview
    1. 1.1 ADS1258EVM Kit
    2. 1.2 ADS1258EVM
  5. 2Getting Started With the ADS1258EVM
  6. 3Analog Interface
    1. 3.1 Analog Input Options
    2. 3.2 ADC Connections and Decoupling
    3. 3.3 Configurable Multiplexer Loop
      1. 3.3.1 Measuring Single-Ended Inputs Using a Pseudo-Differential Configuration
    4. 3.4 Clocking
    5. 3.5 Voltage Reference
  7. 4Digital Interface
    1. 4.1 GPIO
  8. 5Power Supplies
  9. 6Software Installation
  10. 7EVM Operation and GUI
    1. 7.1 Connecting the Hardware
    2. 7.2 EVM GUI Global Settings for ADC Control
    3. 7.3 Time-Domain Display
    4. 7.4 Frequency-Domain Display
    5. 7.5 Histogram Display
  11. 8Bill of Materials, Layout, and Schematics
    1. 8.1 Bill of Materials
    2. 8.2 EVM PCB Layout
    3. 8.3 Schematics
  12. 9Revision History

4.1 GPIO

The ADS1258 has eight dedicated GPIO pins. The EVM connects a 100-kΩ pulldown resistor to each GPIO pin. These resistors prevent the pin voltage from floating because the default ADC settings configure each GPIO as an input. Additionally, 49.9-Ω resistors are placed in series with each GPIO pin to limit current flow into the ADC. All eight GPIO pins are terminated at header J7 for easy connection to external circuitry if desired. Figure 4-2 shows the GPIO circuitry.

GUID-20221026-SS0I-KS22-NGQF-R9PRDMBW8GFP-low.svgFigure 4-2 ADS1258EVM GPIO Circuit and Header