SBAU279 October   2020 ADS7038-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2ADS7038Q1EVM-PDK Overview
    1. 2.1 Connections to Input Channels
    2. 2.2 Digital Interface
    3. 2.3 ADS7038Q1EVM-PDK PAMBoard Interface
    4. 2.4 Power Supplies
  4. 3ADS7038Q1EVM-PDK Initial Setup
    1. 3.1 EVM Plug-In Hardware Setup Instructions
    2. 3.2 The ADS7038 GUI Online and TI Cloud Agent Application Installation
    3. 3.3 ADS7038Q1EVM-PDK GUI Overview
      1. 3.3.1 ADS7038Q1EVM-PDK GUI Landing Page
      2. 3.3.2 ADS7038 Functional Configuration
        1. 3.3.2.1 Device Mode Configuration
        2. 3.3.2.2 Channel Selection
        3. 3.3.2.3 Channel Configuration
          1. 3.3.2.3.1 Input Channel Configuration
          2. 3.3.2.3.2 Output Channel Configuration
          3. 3.3.2.3.3 Alert Configuration
        4. 3.3.2.4 Averaging & Statistics
        5. 3.3.2.5 Cyclic Redundancy Check (CRC)
      3. 3.3.3 Data Capture Tab
        1. 3.3.3.1 Analog Input Data Capture Features
          1. 3.3.3.1.1 Time Domain Display
          2. 3.3.3.1.2 FFT
          3. 3.3.3.1.3 Histogram Display
      4. 3.3.4 Digital Input Page
      5. 3.3.5 Register Map
  5. 4Input Signal-Conditioning Circuitry on the ADS7038Q1EVM
  6. 5Bill of Materials, Printed Circuit Board Layout, and Schematics
    1. 5.1 Bill of Materials
    2. 5.2 PCB Layout
    3. 5.3 Schematics

3.3.2.1 Device Mode Configuration

The ADS7038 can operate in four sampling modes. The mode configuration tab (Figure 3-5) allows the user to select the device mode of operation.

The ADS7038 device has the following sampling modes:

  • Manual Mode: Allows the external host processor to directly request and control when data is sampled. The host provides SPI frames to control conversions and the captured data are returned over the SPI bus after each conversion.

  • Auto-Sequence Mode: The host can configure the device to scan through the enabled analog input channels. The host must provide continuous clocks (SCLK) to the device to scan through the channels and to read the data from the device. The MUX automatically switches through the predetermined channel sequence, and the data conversion results are sent through the data bus.

  • On-the-Fly Mode: The first 5 bits of SDI select the first channel to be sampled before the CS rising edge. There is no latency between channel selection and ADC output data since the ADC samples the next channel on the rising edge of CS.

  • Autonomous Mode: In autonomous mode, the device can be programmed to monitor the voltage applied on the analog input pins of the device and generate an ALERT signal internal to the device when the programmable high or low threshold values are crossed.

The device powers up in manual mode and can be configured into any of the functional modes by writing the configuration registers for the desired mode.
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