SLASF44 may   2023 AFE78201 , AFE88201

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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  Timing Requirements
    7. 6.7  Timing Diagrams
    8. 6.8  Typical Characteristics: VOUT DAC
    9. 6.9  Typical Characteristics: ADC
    10. 6.10 Typical Characteristics: Reference
    11. 6.11 Typical Characteristics: Power Supply
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Digital-to-Analog Converter (DAC) Overview
        1. 7.3.1.1 DAC Resistor String
        2. 7.3.1.2 DAC Buffer Amplifier
        3. 7.3.1.3 DAC Transfer Function
        4. 7.3.1.4 DAC Gain and Offset Calibration
        5. 7.3.1.5 Programmable Slew Rate
        6. 7.3.1.6 DAC Register Structure and CLEAR State
      2. 7.3.2  Analog-to-Digital Converter (ADC) Overview
        1. 7.3.2.1 ADC Operation
        2. 7.3.2.2 ADC Custom Channel Sequencer
        3. 7.3.2.3 ADC Synchronization
        4. 7.3.2.4 ADC Offset Calibration
        5. 7.3.2.5 External Monitoring Inputs
        6. 7.3.2.6 Temperature Sensor
        7. 7.3.2.7 Self-Diagnostic Multiplexer
        8. 7.3.2.8 ADC Bypass
      3. 7.3.3  Programmable Out-of-Range Alarms
        1. 7.3.3.1 Alarm-Based Interrupts
        2. 7.3.3.2 Alarm Action Configuration Register
        3. 7.3.3.3 Alarm Voltage Generator
        4. 7.3.3.4 Temperature Sensor Alarm Function
        5. 7.3.3.5 Internal Reference Alarm Function
        6. 7.3.3.6 ADC Alarm Function
        7. 7.3.3.7 Fault Detection
      4. 7.3.4  IRQ
      5. 7.3.5  Internal Reference
      6. 7.3.6  Integrated Precision Oscillator
      7. 7.3.7  Precision Oscillator Diagnostics
      8. 7.3.8  One-Time Programmable (OTP) Memory
      9. 7.3.9  GPIO
      10. 7.3.10 Timer
      11. 7.3.11 Unique Chip Identifier (ID)
      12. 7.3.12 Scratch Pad Register
    4. 7.4 Device Functional Modes
      1. 7.4.1 Register Built-In Self-Test (RBIST)
      2. 7.4.2 DAC Power-Down Mode
      3. 7.4.3 Reset
    5. 7.5 Programming
      1. 7.5.1 Communication Setup
        1. 7.5.1.1 SPI Mode
        2. 7.5.1.2 UART Mode
      2. 7.5.2 GPIO Programming
      3. 7.5.3 Serial Peripheral Interface (SPI)
        1. 7.5.3.1 SPI Frame Definition
        2. 7.5.3.2 SPI Read and Write
        3. 7.5.3.3 Frame Error Checking
        4. 7.5.3.4 Synchronization
      4. 7.5.4 UART Interface
        1. 7.5.4.1 UART Break Mode (UBM)
      5. 7.5.5 Status Bits
      6. 7.5.6 Watchdog Timer
    6. 7.6 Register Maps
      1. 7.6.1 AFEx8201 Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Multichannel Configuration
    2. 8.2 Typical Application
      1. 8.2.1 Analog Output Module
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 XTR305
            1. 8.2.1.2.1.1 Current-Output Mode
            2. 8.2.1.2.1.2 Voltage Output Mode
            3. 8.2.1.2.1.3 Diagnostic Features
        3. 8.2.1.3 Application Curves
    3. 8.3 Initialization Setup
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

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7.3.3 Programmable Out-of-Range Alarms

The AFEx8201 are capable of continuously analyzing the supplies, external ADC inputs, DAC output voltage, reference, internal temperature, and other internal signals for normal operation.

Normal operation for the conversion results is established through the lower- and upper-threshold registers. When any of the monitored inputs are out of the specified range, the corresponding alarm bit in the alarm status registers is set.

The alarm bits in the alarm status registers are latched. The alarm bits are referred to as being latched because the alarm bits remain set until read by software. This design makes sure that out-of-limit events cannot be missed if the software is polling the device periodically. All bits are cleared when reading the alarm status registers, and all bits are reasserted if the out-of limit condition still exists on the next monitoring cycle. When the alarm event is cleared, the DAC is reloaded with the contents of the DAC active registers, which allows the DAC outputs to return to the previous operating point without any additional commands

All alarms can be used to generate a hardware interrupt signal on the ALARM pin; see also Section 7.3.3.1. In addition, Section 7.3.3.2 describes how the alarm action can be individually configured for each alarm.