SBAS741B October   2015  – April 2020 ADS1018-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      K-Type Thermocouple Measurement Using Integrated Temperature Sensor for Cold-Junction Compensation
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements: Serial Interface
    7. 7.7 Switching Characteristics: Serial Interface
    8. 7.8 Typical Characteristics
  8. 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 Analog Inputs
      3. 8.3.3 Full-Scale Range (FSR) and LSB Size
      4. 8.3.4 Voltage Reference
      5. 8.3.5 Oscillator
      6. 8.3.6 Temperature Sensor
        1. 8.3.6.1 Converting from Temperature to Digital Codes
        2. 8.3.6.2 Converting from Digital Codes to Temperature
    4. 8.4 Device Functional Modes
      1. 8.4.1 Reset and Power-Up
      2. 8.4.2 Operating Modes
        1. 8.4.2.1 Single-Shot Mode and Power-Down
        2. 8.4.2.2 Continuous-Conversion Mode
      3. 8.4.3 Duty Cycling for Low Power
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
      2. 8.5.2 Chip Select (CS)
      3. 8.5.3 Serial Clock (SCLK)
      4. 8.5.4 Data Input (DIN)
      5. 8.5.5 Data Output and Data Ready (DOUT/DRDY)
      6. 8.5.6 Data Format
      7. 8.5.7 Data Retrieval
        1. 8.5.7.1 32-Bit Data Transmission Cycle
        2. 8.5.7.2 16-Bit Data Transmission Cycle
    6. 8.6 Register Maps
      1. 8.6.1 Conversion Register [reset = 0000h]
        1. Table 4. Conversion Register Field Descriptions
      2. 8.6.2 Config Register [reset = 058Bh]
        1. Table 5. Config Register Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Serial Interface Connections
      2. 9.1.2 GPIO Ports for Communication
      3. 9.1.3 Analog Input Filtering
      4. 9.1.4 Single-Ended Inputs
      5. 9.1.5 Connecting Multiple Devices
      6. 9.1.6 Pseudo Code Example
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power-Supply Sequencing
    2. 10.2 Power-Supply Decoupling
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.6.2 Config Register [reset = 058Bh]

The 16-bit Config register can be used to control the ADS1018-Q1 operating mode, input selection, data rate, full-scale range, and temperature sensor mode. The register format is shown in Figure 17.

Figure 17. Config Register
15 14 13 12 11 10 9 8
SS MUX[2:0] PGA[2:0] MODE
R/W-0h R/W-0h R/W-2h R/W-1h
7 6 5 4 3 2 1 0
DR[2:0] TS_MODE PULL_UP_EN NOP[1:0] Reserved
R/W-4h R/W-0h R/W-1h R/W-1h R-1h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 5. Config Register Field Descriptions

Bit Field Type Reset Description
15 SS R/W 0h Single-shot conversion start
This bit is used to start a single conversion. SS can only be written when in power-down state and has no effect when a conversion is ongoing.


When writing:
0 = No effect
1 = Start a single conversion (when in power-down state)
Always reads back as 0 (default).
14:12 MUX[2:0] R/W 0h Input multiplexer configuration
These bits configure the input multiplexer.


000 = AINP is AIN0 and AINN is AIN1 (default)
001 = AINP is AIN0 and AINN is AIN3
010 = AINP is AIN1 and AINN is AIN3
011 = AINP is AIN2 and AINN is AIN3
100 = AINP is AIN0 and AINN is GND
101 = AINP is AIN1 and AINN is GND
110 = AINP is AIN2 and AINN is GND
111 = AINP is AIN3 and AINN is GND
11:9 PGA[2:0] R/W 2h Programmable gain amplifier configuration
These bits configure the programmable gain amplifier.


000 = FSR is ±6.144 V(1)
001 = FSR is ±4.096 V(1)
010 = FSR is ±2.048 V (default)
011 = FSR is ±1.024 V
100 = FSR is ±0.512 V
101 = FSR is ±0.256 V
110 = FSR is ±0.256 V
111 = FSR is ±0.256 V
8 MODE R/W 1h Device operating mode
This bit controls the ADS1018-Q1 operating mode.


0 = Continuous-conversion mode
1 = Power-down and single-shot mode (default)
7:5 DR[2:0] R/W 4h Data rate
These bits control the data-rate setting.


000 = 128 SPS
001 = 250 SPS
010 = 490 SPS
011 = 920 SPS
100 = 1600 SPS (default)
101 = 2400 SPS
110 = 3300 SPS
111 = Not Used
4 TS_MODE R/W 0h Temperature sensor mode
This bit configures the ADC to convert temperature or input signals.


0 = ADC mode (default)
1 = Temperature sensor mode
3 PULL_UP_EN R/W 1h Pullup enable
This bit enables a weak internal pullup resistor on the DOUT/DRDY pin only when CS is high. When enabled, an internal 400-kΩ resistor connects the bus line to supply. When disabled, the DOUT/DRDY pin floats.


0 = Pullup resistor disabled on DOUT/DRDY pin
1 = Pullup resistor enabled on DOUT/DRDY pin (default)
2:1 NOP[1:0] R/W 1h No operation
The NOP[1:0] bits control whether data are written to the Config register or not. For data to be written to the Config register, the NOP[1:0] bits must be 01. Any other value results in a NOP command. DIN can be held high or low during SCLK pulses without data being written to the Config register.


00 = Invalid data; do not update the contents of the Config register
01 = Valid data; update the Config register (default)
10 = Invalid data; do not update the contents of the Config register
11 = Invalid data; do not update the contents of the Config register
0 Reserved R 1h Reserved


Writing either 0 or 1 to this bit has no effect.
Always reads back 1.
(1) This parameter expresses the full-scale range of the ADC scaling. Do not apply more than VDD + 0.3 V to this device.