TIDUF65 March   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Consideration
    3. 2.3 Highlighted Products
      1. 2.3.1 TMCS1123
      2. 2.3.2 ADS7043
      3. 2.3.3 AMC1035
      4. 2.3.4 REF2033
  9. 3System Design Theory
    1. 3.1 Hall-Effect Current Sensor Schematic Design
    2. 3.2 Analog-to-Digital Converter
      1. 3.2.1 Delta-Sigma Modulator
        1. 3.2.1.1 Common-Mode Voltage Limit
        2. 3.2.1.2 Input Filter
        3. 3.2.1.3 Interface to MCU
      2. 3.2.2 12-bit SAR ADC
        1. 3.2.2.1 Common-Mode Voltage Limit
        2. 3.2.2.2 Input Filter
        3. 3.2.2.3 Interface to MCU
    3. 3.3 Power Supply and Reference Voltage
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Precautions
    4. 4.4 Test Results
      1. 4.4.1 DC Performance
        1. 4.4.1.1 Output Voltage Noise and ENOB After A/D Conversion
        2. 4.4.1.2 Linearity and Temperature Drift
      2. 4.4.2 AC Performance
        1. 4.4.2.1 SNR Measurement
        2. 4.4.2.2 Latency Test
      3. 4.4.3 PWM Rejection
      4. 4.4.4 Overcurrent Response
      5. 4.4.5 Adjacent Current Rejection
      6. 4.4.6 Power Supply Rejection Ratio
      7. 4.4.7 Digital Interface
  11. 5Performance Comparison with Competitor’s Device
    1. 5.1 Effective Number of Bits
    2. 5.2 Latency
    3. 5.3 PWM Rejection
  12. 6Design and Documentation Support
    1. 6.1 Design Files
      1. 6.1.1 Schematics
      2. 6.1.2 BOM
      3. 6.1.3 PCB Layout Recommendations
        1. 6.1.3.1 Layout Prints
    2. 6.2 Tools and Software
    3. 6.3 Documentation Support
    4. 6.4 Support Resources
    5. 6.5 Trademarks
  13. 7About the Author

1.1 Key System Specifications

PARAMETER SPECIFICATION COMMENT
Full scale input current range (FSR) ±66A (MAX) TMCS1123B1 at 3.3V
Effective number of bits 9 ENOB (TYP) TMCS1123B1 and ADS7043
9.7 ENOB (TYP) TMCS1123B1 and AMC1035 with Sinc3 OSR64 filter
Propagation delay 0.6µs (TYP) TMCS1123B1
1.6µs (TYP) Including A/D conversion and serial peripheral interface (SPI) transfer (ADS7043)
5.5µs (TYP) Including Sinc3 OSR64 filter (AMC1035)
OC threshold 2-times FSR Configurable from 0 to 2.5-times FSR
OC response time 100ns (TYP)
Isolation rating Reinforced
Maximum working voltage ±1300V (MAX) Tested at 320VDC working voltage
A/D converter options 12-bit SAR ADC (ADS7043) or delta-sigma modulator (AMC1035) Selectable by jumper
MCU interface connector 2 × 10 header (2.54mm pitch), 3.3V I/O
Logic supply 5V ±10%
Temperature range (ambient) –40°C to 125°C Tested from 25°C to 85°C
PCB size 43.5mm × 86.34mm 1.71in × 3.4in (inch)
PCB layer stack 4 layer 2oz copper on top and bottom layers