SBAU378A September   2021  – January 2022 ADS1148 , ADS1248

 

  1.   Trademarks
  2. 1Introduction
  3. 2Getting Started With the ADS1x48EVM
  4. 3ADS1x48EVM Overview
    1. 3.1 Analog and Digital Power Supplies
    2. 3.2 Voltage Reference Options
    3. 3.3 Clock Options
    4. 3.4 Digital Interface
    5. 3.5 Analog Input Connections
      1. 3.5.1 Connecting a Thermocouple to J5 on the ADS1x48EVM
      2. 3.5.2 Connecting a Thermistor to J5 on the ADS1x48EVM
        1. 3.5.2.1 Using Thermistor RT1 for Thermocouple Cold Junction Compensation
      3. 3.5.3 Connecting an RTD to J6 on the ADS1x48EVM
        1. 3.5.3.1 Connecting a 2-Wire RTD Using a Low-Side RREF to J6 on the ADS1x48EVM
        2. 3.5.3.2 Connecting a 2-Wire RTD Using a High-Side RREF to J6 on the ADS1x48EVM
        3. 3.5.3.3 Connecting a 3-Wire RTD Using One IDAC and a Low-Side RREF to J6 on the ADS1x48EVM
        4. 3.5.3.4 Connecting a 3-Wire RTD Using One IDAC and a High-Side RREF to J6 on the ADS1x48EVM
        5. 3.5.3.5 Connecting a 3-Wire RTD Using Two IDACs and a Low-Side RREF to J6 on the ADS1x48EVM
        6. 3.5.3.6 Connecting a 3-Wire RTD Using Two IDACs and a High-Side RREF to J6 on the ADS1x48EVM
        7. 3.5.3.7 Connecting a 4-Wire RTD Using a Low-Side RREF to J6 on the ADS1x48EVM
        8. 3.5.3.8 Connecting a 4-Wire RTD Using a High-Side RREF to J6 on the ADS1x48EVM
        9. 3.5.3.9 Summary of ADS1x48EVM RTD Configuration Settings
      4. 3.5.4 Connecting a General-Purpose Input to J5 on the ADS1x48EVM
  5. 4ADS1x48EVM GUI
    1. 4.1 Home
      1. 4.1.1 Menu Bar
        1. 4.1.1.1 File Menu
        2. 4.1.1.2 Options Menu
        3. 4.1.1.3 Tools Menu
        4. 4.1.1.4 Help Menu
    2. 4.2 Data Capture
      1. 4.2.1 Time Domain and Histogram Statistics
      2. 4.2.2 Time Domain Plot
      3. 4.2.3 Histogram Plot
      4. 4.2.4 FFT Statistics and Plot
    3. 4.3 Register Map
      1. 4.3.1 Register Read and Write Options
        1. 4.3.1.1 Read Register Options
        2. 4.3.1.2 Write Register Options
  6. 5Bill of Materials, Printed Circuit Board Layout, and Schematic
    1. 5.1 Bill of Materials
    2. 5.2 Printed Circuit Board Layout
    3. 5.3 Schematic
  7. 6Revision History

3.4 Digital Interface

The ADS1x48 devices support the digital SPI and functional modes as detailed in the 24-bit ADS1248 data sheet or the 16-bit ADS1148 data sheet. As stated in Section 3.1, the PAMBoard operates at a 3.3-V logic level provided by the host computer and the ADS1x48EVM board uses this same 3.3-V logic level for DVDD.

Digital interface connections from the ADS1x48EVM to the PAMBoard include power, I2C, SPI, and a GPIO connection used to trigger an interrupt at the end of conversion that signifies new data are available. The digital connections are highlighted in the silkscreen shown in Figure 3-5 and are described in detail in Table 3-2. Use these connection points for troubleshooting the SPI communication with a logic analyzer or to attach an external MCU to control the ADS1x48EVM without the PAMBoard.

GUID-20210706-CA0I-TXWL-P4TD-JVGT3WSNLXDK-low.pngFigure 3-5 ADS1x48EVM-to-PAMBoard Connections
Table 3-2 ADS1x48EVM Header Pinout and Description
DescriptionConnectorConnectorDescriptionDescriptionConnectorConnectorConnector
3.3 VJ1:1J3:215 VJ4:40J2:20GND
J1:2J3:22GNDJ4:39J2:19
J1:3J3:23J4:38J2:18
J1:4J3:24RESETJ4:37J2:17
J1:5J3:25J4:36J2:16
J1:6J3:26J4:35J2:15DIN
SPI SCLKJ1:7J3:27J4:34J2:14DOUT/DRDY
J1:8J3:28STARTJ4:33J2:13
I2C SCLJ1:9J3:29J4:32J2:12SPI CS
I2C SDAJ1:10J3:30DRDYJ4:31J2:11SPI CS