SBAU206B april   2015  – may 2023 ADS1262 , ADS1263

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1EVM Overview
    1. 1.1 ADS1263EVM Kit
    2. 1.2 ADS1263EVM Board
  5. 2Getting Started With the ADS1263EVM
  6. 3Analog Interface
    1. 3.1 Analog Input Options
      1. 3.1.1 ADS1263 Integrated Input Functions
        1. 3.1.1.1 ADC Inputs
        2. 3.1.1.2 IDAC Output
        3. 3.1.1.3 VBIAS Output
        4. 3.1.1.4 External Reference
        5. 3.1.1.5 Test DAC Output
        6. 3.1.1.6 GPIO
      2. 3.1.2 Analog Sensor Connections
        1. 3.1.2.1 Connecting a Thermocouple to J4 on the ADS1263EVM
        2. 3.1.2.2 Connecting a Thermistor to J3 on the ADS1263EVM
        3. 3.1.2.3 Using Thermistor RT1 for Thermocouple Cold-Junction Compensation
        4. 3.1.2.4 Connecting an RTD to J3 on the ADS1263EVM
          1. 3.1.2.4.1 Connecting a 2-Wire RTD
          2. 3.1.2.4.2 Connecting a 3-Wire RTD
          3. 3.1.2.4.3 Connecting a 4-Wire RTD
    2. 3.2 ADC Connections and Decoupling
    3. 3.3 Clocking
    4. 3.4 Voltage Reference
  7. 4Digital Interface
  8. 5Power Supplies
  9. 6Software Installation
  10. 7EVM Operation and GUI
    1. 7.1 Connecting the EVM 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
    6. 7.6 Using the GUI to Control ADC2
  11. 8Bill of Materials, PCB Layout, and Schematics
    1. 8.1 Bill of Materials
    2. 8.2 PCB Layout
    3. 8.3 Schematics
  12. 9Revision History

4 Digital Interface

As noted in Section 1 and Section 2, the EVM interfaces with the PHI and communicates with the host over USB. Figure 4-1 shows how the PHI communicates with two devices on the EVM: the ADS1263 using the serial peripheral interface (SPI) and the EEPROM using the inter-integrated circuit (I2C) interface. The EEPROM comes preprogrammed with the information required to configure and initialize the ADS1263EVM. When the hardware is initialized, no further communication with the EEPROM is necessary and this device can be ignored by the user.

GUID-20221111-SS0I-SF2J-XKDX-CQ0RGHM6LNLW-low.svgFigure 4-1 ADS1263EVM Digital Interface Connections

The ADS1263 uses SPI serial communication in mode 01 where CPOL = 0 and CPHA = 1. Header J2 in Figure 4-1 provides test points for all digital signals to and from the PHI controller. The test points can be connected to a logic analyzer for convenient visualization of the digital signals. These test points can also be used to communicate with the ADS1263EVM using an external controller.

Pullup resistor R22 drives the START pin high and puts ADC1 in continuous conversion mode. The ADC then continuously converts until the START pin is returned low. Pullup resistor R24 drives the RESET/PWDN pin high to hold the ADC in conversion mode. A momentary low pulse resets the ADC. Holding RESET/PWDN low enables the ADC power-down mode. Pullup resistor R35 brings the chip-select (CS) pin high, which resets the serial interface. The CS pin must be pulled low during the entire data transaction. More information about the specifics of the digital pins can be found in the ADS1263 data sheet.