SLAU880C December   2022  – May 2024 ULC1001

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 2Introduction
  6. 3Getting Started
    1. 3.1 Evaluation Kit Contents
    2. 3.2 Connection Procedure
    3. 3.3 GUI Setup
  7. 4System Overview
    1. 4.1 System ISR Period
    2. 4.2 System Drive Voltage
    3. 4.3 System Calibration
      1. 4.3.1 DC Bias Calibration
      2. 4.3.2 Temperature Calibration
      3. 4.3.3 Auto Sense Calibration
      4. 4.3.4 Cleaning and Power Calibration
    4. 4.4 System Cleaning
    5. 4.5 System Diagnostics
  8. 5GUI Overview
    1. 5.1 GUI Top Level Layout
      1. 5.1.1 North Pane
      2. 5.1.2 South Pane
      3. 5.1.3 Center Pane
    2. 5.2 High Level Page
      1. 5.2.1 Burst Parameters
      2. 5.2.2 Calibration Settings
        1. 5.2.2.1 Voltage and Current Sense Circuitry
      3. 5.2.3 Cleaning Mode Settings
        1. 5.2.3.1 Auto-Cleaning
        2. 5.2.3.2 Water Cleaning
        3. 5.2.3.3 Deice Cleaning
        4. 5.2.3.4 Mud Cleaning Mode
      4. 5.2.4 Power and Diagnostic Settings
    3. 5.3 Register Map Page
    4. 5.4 I2C Configuration Page
    5. 5.5 GUI Functions
      1. 5.5.1 Monitor Communication Status
      2. 5.5.2 Load and Save Configuration Files
        1. 5.5.2.1 MSP430 Firmware Programming
      3. 5.5.3 Re-initialize System
      4. 5.5.4 Fault and Flag Monitoring and Clearing
      5. 5.5.5 Run Calibration
      6. 5.5.6 Run Cleaning Modes
      7. 5.5.7 Run Diagnostic Mode
      8. 5.5.8 Run Abort
      9. 5.5.9 Script Recording
  9. 6Hardware Design Files
    1. 6.1 Schematics
    2. 6.2 PCB Layouts
    3. 6.3 Bill of Materials (BOM)
  10. 7Revision History

5.2.2.1 Voltage and Current Sense Circuitry

Each input into the ULC1001 current and voltage sense amplifiers require a voltage divider to decrease the high voltage across the transducer from 0V to 0.9V. The circuit representation of the current and voltage sense amplifiers is shown in Figure 5-9, where the items in I-sense Amp and V-sense Amp are internal to ULC1001. The resistors used in the voltage dividers must have a 0.1% tolerance to achieve high accuracy for power measurements. Three scale factors, USER_Params_ohms_sf_Q22, USER_Params_watts_sf_Q18, and USER_Params_Imag_max_sf_Q27, are used to convert the measured values into power, impedance, and current values, respectively. Use the below equation to determine the scale factors and the current and voltage sense amplifier gains. Table 5-6 containing typical resistor values for common voltage levels.

Note: The equivalent resistance between VDD and GND must be ≥ 4kΩ. RF is fixed to 84kΩ.

ULC1001 DRV2901 ULC1001-DRV-FL-EVM ULC1001-DRV290XEVM Voltage and Current Sense Amplifiers
Figure 5-9 Voltage and Current Sense Amplifiers
Equation 2. U S E R _ P a r a m s _ o h m s _ s f _ Q 22 = I S N S G A I N V S N S G A I N
Equation 3. U S E R _ P a r a m s _ w a t t s _ s f _ Q 18 = 1 V S N S G A I N ✕ 1 I S N S G A I N ✕ 0.2025
Equation 4. U S E R _ P a r a m s _ I m a g _ m a x _ s f _ Q 27 =   0.9 I S N S G A I N
Equation 5. I S N S G A I N ( V A ) = R f   ✕   R S N S R 4
Equation 6. V S N S G A I N ( V V ) = 1.043 ✕ R f R 1 ✕ R 3 ✕ ( 1 R 1 + 1 R 2 + 1 R 3 )
Table 5-6 Voltage and Current Sense Resistor Reference Values R5 = 6kΩ. R6 = 2kΩ
Differential Voltage (pk-pk) R1 R2 R3 R4
460 1.3MΩ 6.34kΩ 294kΩ 422kΩ
90 360kΩ 30kΩ 1MΩ 150kΩ
40 150kΩ 30kΩ 1MΩ 150kΩ