SBAS501D May   2013  – May 2026 ADS1220

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 SPI Timing Requirements
    7. 6.7 SPI Switching Characteristics
    8. 6.8 Timing Diagrams
    9. 6.9 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Noise Performance
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Multiplexer
      2. 8.3.2  Low-Noise PGA
        1. 8.3.2.1 PGA Common-Mode Voltage Requirements
        2. 8.3.2.2 Bypassing the PGA
      3. 8.3.3  Voltage Reference
      4. 8.3.4  Clock Source
      5. 8.3.5  Modulator
      6. 8.3.6  Digital Filter
      7. 8.3.7  Output Data Rate
      8. 8.3.8  Excitation Current Sources
      9. 8.3.9  Low-Side Power Switch
      10. 8.3.10 Sensor Detection
      11. 8.3.11 System Monitor
      12. 8.3.12 Offset Calibration
      13. 8.3.13 Temperature Sensor
        1. 8.3.13.1 Converting From Digital Codes to Temperature
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Up and Reset
      2. 8.4.2 Conversion Modes
        1. 8.4.2.1 Single-Shot Conversion Mode
        2. 8.4.2.2 Continuous Conversion Mode
      3. 8.4.3 Operating Modes
        1. 8.4.3.1 Normal Mode
        2. 8.4.3.2 Duty-Cycle Mode
        3. 8.4.3.3 Turbo Mode
        4. 8.4.3.4 Power-Down Mode
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 Chip Select (CS)
        2. 8.5.1.2 Serial Clock (SCLK)
        3. 8.5.1.3 Data Ready ( DRDY)
        4. 8.5.1.4 Data Input (DIN)
        5. 8.5.1.5 Data Output and Data Ready (DOUT/DRDY)
        6. 8.5.1.6 SPI Timeout
      2. 8.5.2 Data Format
      3. 8.5.3 Commands
        1. 8.5.3.1 RESET (0000 011xb)
        2. 8.5.3.2 START/SYNC (0000 100xb)
        3. 8.5.3.3 POWERDOWN (0000 001xb)
        4. 8.5.3.4 RDATA (0001 xxxxb)
        5. 8.5.3.5 RREG (0010 rrnnb)
        6. 8.5.3.6 WREG (0100 rrnnb)
      4. 8.5.4 Reading Data
      5. 8.5.5 Sending Commands
      6. 8.5.6 Interfacing with Multiple Devices
    6. 8.6 Register Map
      1. 8.6.1 Configuration Registers
      2. 8.6.2 Register Descriptions
        1. 8.6.2.1 Configuration Register 0 (Address = 00h) [reset = 00h]
        2. 8.6.2.2 Configuration Register 1 (Address = 01h) [reset = 00h]
        3. 8.6.2.3 Configuration Register 2 (Address = 02h) [reset = 00h]
        4. 8.6.2.4 Configuration Register 3 (Address = 03h) [reset = 00h]
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Serial Interface Connections
      2. 9.1.2 Analog Input Filtering
      3. 9.1.3 External Reference and Ratiometric Measurements
      4. 9.1.4 Establishing a Proper Common-Mode Input Voltage
      5. 9.1.5 Unused Inputs and Outputs
      6. 9.1.6 Pseudo Code Example
    2. 9.2 Typical Applications
      1. 9.2.1 K-Type Thermocouple Measurement (–200°C to +1250°C)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 3-Wire RTD Measurement (–200°C to +850°C)
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Design Variations for 2-Wire and 4-Wire RTD Measurements
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Resistive Bridge Measurement
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Power-Supply Sequencing
      2. 9.3.2 Power-Supply Ramp Rate
      3. 9.3.3 Power-Supply Decoupling
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

8.6.2.2 Configuration Register 1 (Address = 01h) [reset = 00h]

Figure 8-33 Configuration Register 1
7 6 5 4 3 2 1 0
DR[2:0] MODE[1:0] CM TS BCS
R/W-000b R/W-00b R/W-0b R/W-0b R/W-0b
Table 8-11 Configuration Register 1 Field Descriptions
Bit Field Type Reset Description
7:5 DR[2:0] R/W 000b Data rate
These bits control the data rate setting depending on the selected operating mode. Table 8-12 lists the bit settings for normal, duty-cycle, and turbo mode.
4:3 MODE[1:0] R/W 00b Operating mode
These bits control the operating mode the device operates in.


00b : Normal mode (256kHz modulator clock)
01b : Duty-cycle mode (internal duty cycle of 1:4)
10b : Turbo mode (512kHz modulator clock)
11b : Reserved
2 CM R/W 0b Conversion mode
This bit sets the conversion mode for the device.


0b : Single-shot conversion mode
1b : Continuous conversion mode
1 TS R/W 0b Temperature sensor mode
This bit enables the internal temperature sensor and puts the device in temperature sensor mode.
The settings of configuration register 0 have no effect and the device uses the internal reference for measurement when temperature sensor mode is enabled.


0b : Disables temperature sensor
1b : Enables temperature sensor
0 BCS R/W 0b Burn-out current sources
This bit controls the 10µA, burn-out current sources.
The burn-out current sources can be used to detect sensor faults such as wire breaks and shorted sensors.


0b : Current sources off
1b : Current sources on
Table 8-12 DR Bit Settings(1)
NORMAL MODE DUTY-CYCLE MODE TURBO MODE
000b = 20SPS 000b = 5SPS 000b = 40SPS
001b = 45SPS 001b = 11.25SPS 001b = 90SPS
010b = 90SPS 010b = 22.5SPS 010b = 180SPS
011b = 175SPS 011b = 44SPS 011b = 350SPS
100b = 330SPS 100b = 82.5SPS 100b = 660SPS
101b = 600SPS 101b = 150SPS 101b = 1200SPS
110b = 1000SPS 110b = 250SPS 110b = 2000SPS
111b = Reserved 111b = Reserved 111b = Reserved
(1) Data rates provided are calculated using the internal oscillator or an external 4.096MHz clock. The data rates scale proportionally with the external clock frequency when an external clock other than 4.096MHz is used.