SNAS648B October 2014  – August 2015 TDC1000 , TDC1000-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Timing Requirements
    7. 6.7Switching Characteristics
    8. 6.8Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Transmitter Signal Path
      2. 8.3.2Receiver Signal Path
      3. 8.3.3Low Noise Amplifier (LNA)
      4. 8.3.4Programmable Gain Amplifier (PGA)
      5. 8.3.5Receiver Filters
      6. 8.3.6Comparators for STOP Pulse Generation
        1. 8.3.6.1Threshold Detector and DAC
        2. 8.3.6.2Zero-cross Detect Comparator
        3. 8.3.6.3Event Manager
      7. 8.3.7Common-mode Buffer (VCOM)
      8. 8.3.8Temperature Sensor
        1. 8.3.8.1Temperature Measurement with Multiple RTDs
        2. 8.3.8.2Temperature Measurement with a Single RTD
    4. 8.4Device Functional Modes
      1. 8.4.1Time-of-Flight Measurement Mode
        1. 8.4.1.1Mode 0
        2. 8.4.1.2Mode 1
        3. 8.4.1.3Mode 2
      2. 8.4.2State Machine
      3. 8.4.3TRANSMIT Operation
        1. 8.4.3.1Transmission Pulse Count
        2. 8.4.3.2TX 180° Pulse Shift
        3. 8.4.3.3Transmitter Damping
      4. 8.4.4RECEIVE Operation
        1. 8.4.4.1Single Echo Receive Mode
        2. 8.4.4.2Multiple Echo Receive Mode
      5. 8.4.5Timing
        1. 8.4.5.1Timing Control and Frequency Scaling (CLKIN)
        2. 8.4.5.2TX/RX Measurement Sequencing and Timing
      6. 8.4.6Time-of-Flight (TOF) Control
        1. 8.4.6.1Short TOF Measurement
        2. 8.4.6.2Standard TOF Measurement
        3. 8.4.6.3Standard TOF Measurement with Power Blanking
        4. 8.4.6.4Common-mode Reference Settling Time
        5. 8.4.6.5TOF Measurement Interval
      7. 8.4.7Averaging and Channel Selection
      8. 8.4.8Error Reporting
    5. 8.5Programming
      1. 8.5.1Serial Peripheral Interface (SPI)
        1. 8.5.1.1Chip Select Bar (CSB)
        2. 8.5.1.2Serial Clock (SCLK)
        3. 8.5.1.3Serial Data Input (SDI)
        4. 8.5.1.4Serial Data Output (SDO)
    6. 8.6Register Maps
      1. 8.6.1TDC1000 Registers
        1. 8.6.1.1 CONFIG_0 Register (address = 0h) [reset = 45h]
        2. 8.6.1.2 CONFIG_1 Register (address = 1h) [reset = 40h]
        3. 8.6.1.3 CONFIG_2 Register (address = 2h) [reset = 0h]
        4. 8.6.1.4 CONFIG_3 Register (address 3h) [reset = 3h]
        5. 8.6.1.5 CONFIG_4 Register (address = 4h) [reset = 1Fh]
        6. 8.6.1.6 TOF_1 Register (address = 5h) [reset = 0h]
        7. 8.6.1.7 TOF_0 Register (address = 6h) [reset = 0h]
        8. 8.6.1.8 ERROR_FLAGS Register (address = 7h) [reset = 0h]
        9. 8.6.1.9 TIMEOUT Register (address = 8h) [reset = 19h]
        10. 8.6.1.10CLOCK_RATE Register (address = 9h) [reset = 0h]
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Applications
      1. 9.2.1Level and Fluid Identification Measurements
        1. 9.2.1.1Design Requirements
        2. 9.2.1.2Detailed Design Procedure
          1. 9.2.1.2.1Level Measurements
          2. 9.2.1.2.2Fluid Identification
        3. 9.2.1.3Application Curves
      2. 9.2.2Water Flow Metering
        1. 9.2.2.1Design Requirements
        2. 9.2.2.2Detailed Design Procedure
          1. 9.2.2.2.1Regulations and Accuracy
          2. 9.2.2.2.2Transit-Time in Ultrasonic Flow-Meters
          3. 9.2.2.2.3ΔTOF Accuracy Requirement Calculation
          4. 9.2.2.2.4Operation
        3. 9.2.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Third-Party Products Disclaimer
      2. 12.1.2Development Support
    2. 12.2Documentation Support
    3. 12.3Related Links
    4. 12.4Community Resources
    5. 12.5Trademarks
    6. 12.6Electrostatic Discharge Caution
    7. 12.7Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • Automotive AEC-Q100 (TDC1000-Q1)
  • Measurement Range: Up to 8 ms
  • Operating Current: 1.8 µA (2 SPS)
  • Transmitter Channels TX1/TX2:
    • Supports Single or Dual-Transducer Application
    • Programmable Excitation: 31.25 kHz to 4 MHz, Up to 31 Pulses
  • Receiver Channels RX1/RX2:
    • STOP Cycle-to-Cycle Jitter: 50 psRMS
    • Low-Noise and Programmable Gain Amplifiers
    • Access to Signal Chain for External Filter Design
    • Programmable Threshold Comparator for Echo Qualification
    • Automatic Channel Swapping for Differential Time-of-Flight (TOF) Measurement
    • Programmable Low Power Mode for Long TOF Measurements
  • Temperature Measurement
    • Interface to Two PT1000/500 RTDs
    • RTD-to-RTD Matching Accuracy 0.02°CRMS
  • Operating Temperature Range: -40°C to 125°C

2 Applications

  • Measurements through tanks of varying materials:
    • Fluid Level
    • Fluid Identification / Concentration
  • Flow Metering: Water, Gas, Heat
  • Distance/Proximity Sensing

3 Description

The TDC1000 is a fully integrated analog front-end (AFE) for ultrasonic sensing measurements of level, fluid identification/concentration, flow, and proximity/ distance applications common in automotive, industrial, medical, and consumer markets. When paired with an MSP430/C2000 MCU, power, wireless, and source code, TI provides the complete ultrasonic sensing solution.

TI's Ultrasonic AFE offers programmability and flexibility to accommodate a wide-range of applications and end equipment. The TDC1000 can be configured for multiple transmit pulses and frequencies, gain, and signal thresholds for use with a wide-range of transducer frequencies (31.25kHz to 4MHz) and Q-factors. Similarly, the programmability of the receive path allows ultrasonic waves to be detected over a wider range of distances/tank sizes and through various mediums.

Selecting different modes of operation, the TDC1000 can be optimized for low power consumption,
making it ideal for battery powered flow meters,
level instrumentation, and distance/proximity measurements. The low noise amplifiers and comparators provide extremely low jitter, enabling picosecond resolution and accuracy for zero and low flow measurements.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
TDC1000TSSOP (28) PW9.70 mm × 4.40 mm
TDC1000-Q1TSSOP (28) PW9.70 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.
TDC1000 TDC1000-Q1 fp_app_nas648.gif

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from A Revision (December 2014) to B Revision

  • Added PW package nomenclature throught documentGo
  • Changed programmed threshold in Figure 35, Multiple Echo Receive Mode (Zoom-in) Go
  • Added trigger to START time description Go
  • Changed notes on Figure 37, Short TOF Measurement Go
  • Changed note A on Figure 38, Standard TOF Measurement Go
  • Changed note A on Figure 39, Standard TOF Measurement with Blanking Enabled Go
  • Changed Equation 9, downstream TOFGo

Changes from * Revision (October 2014) to A Revision

  • Added Pin Configuration and Functions section, Specifications section, Parameter Measurement Information section, Detailed Description section, Application and Implementation section, Power Supply Recommendations section and Layout sectionGo
  • Changed Device and Documentation Support section Go