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 Digital Interface

As noted in Section 1, 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 ADS1258 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 ADS1258EVM. When the hardware is initialized, no further communication with the EEPROM is necessary and this device can be ignored by the user.

GUID-20221026-SS0I-TP3Q-QGMT-FGC0MLF9H4XN-low.svg Figure 4-1 ADS1258EVM Digital Interface Connections (SPI and I2C)

The ADS1258 communicates with the PHI using an SPI interface in mode 00 (CPOL = 0, CPHA = 0). Header J6 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 ADS1258EVM using an external controller.