SNAS686 May 2016 TDC7201

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. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1LDO
      2. 7.3.2CLOCK
      3. 7.3.3Counters
        1. 7.3.3.1Coarse and Clock Counters Description
        2. 7.3.3.2Coarse and Clock Counters Overflow
        3. 7.3.3.3Clock Counter STOP Mask
        4. 7.3.3.4ENABLE
    4. 7.4Device Functional Modes
      1. 7.4.1Calibration
      2. 7.4.2Measurement Modes
        1. 7.4.2.1Measurement Mode 1
          1. 7.4.2.1.1Calculating Time-of-Flight (Measurement Mode 1)
        2. 7.4.2.2Measurement Mode 2
          1. 7.4.2.2.1Calculating Time-of-Flight (TOF) (Measurement Mode 2)
      3. 7.4.3Timeout
      4. 7.4.4Multi-Cycle Averaging
      5. 7.4.5START and STOP Edge Polarity
      6. 7.4.6Measurement Sequence
      7. 7.4.7Wait Times for TDC7201 Startup
    5. 7.5Programming
      1. 7.5.1Serial Peripheral Interface (SPI)
        1. 7.5.1.1CSBx
        2. 7.5.1.2SCLK
        3. 7.5.1.3DIN
        4. 7.5.1.4DOUTx
        5. 7.5.1.5Register Read/Write
        6. 7.5.1.6Auto Increment Mode
    6. 7.6Register Maps
      1. 7.6.1 Register Initialization
      2. 7.6.2 TDCx_CONFIG1: TDCx Configuration Register 1 R/W (address = 00h, CSBx asserted) [reset = 0h]
      3. 7.6.3 TDCx_CONFIG2: TDCx Configuration Register 2 R/W (address = 01h, CSBx asserted) [reset = 40h]
      4. 7.6.4 TDCx_INT_STATUS: Interrupt Status Register (address = 02h, CSBx asserted) [reset = 00h]
      5. 7.6.5 TDCx_INT_MASK: TDCx Interrupt Mask Register R/W (address = 03h, CSBx asserted) [reset = 07h]
      6. 7.6.6 TDCx_COARSE_CNTR_OVF_H: Coarse Counter Overflow High Value Register (address = 04h, CSBx asserted) [reset = FFh]
      7. 7.6.7 TDCx_COARSE_CNTR_OVF_L: TDCx Coarse Counter Overflow Low Value Register (address = 05h, CSBx asserted) [reset = FFh ]
      8. 7.6.8 TDCx_CLOCK_CNTR_OVF_H: Clock Counter Overflow High Register (address = 06h, CSBx asserted) [reset = FFh]
      9. 7.6.9 TDCx_CLOCK_CNTR_OVF_L: Clock Counter Overflow Low Register (address = 07h, CSBx asserted) [reset = FFh]
      10. 7.6.10TDCx_CLOCK_CNTR_STOP_MASK_H: CLOCK Counter STOP Mask High Value Register (address = 08h, CSBx asserted) [reset = 00h]
      11. 7.6.11TDCx_CLOCK_CNTR_STOP_MASK_L: CLOCK Counter STOP Mask Low Value Register (address = 09h, CSBx asserted) [reset = 00h]
      12. 7.6.12TDCx_TIME1: Time 1 Register (address: 10h, CSBx asserted) [reset = 00_0000h]
      13. 7.6.13TDCx_CLOCK_COUNT1: Clock Count Register (address: 11h, CSBx asserted) [reset = 00_0000h]
      14. 7.6.14TDCx_TIME2: Time 2 Register (address: 12h, CSBx asserted) [reset = 00_0000h]
      15. 7.6.15TDCx_CLOCK_COUNT2: Clock Count Register (address: 13h, CSBx asserted) [reset = 00_0000h]
      16. 7.6.16TDCx_TIME3: Time 3 Register (address: 14h, CSBx asserted) [reset = 00_0000h]
      17. 7.6.17TDCx_CLOCK_COUNT3: Clock Count Registers (address: 15h, CSBx asserted) [reset = 00_0000h]
      18. 7.6.18TDCx_TIME4: Time 4 Register (address: 16h, CSBx asserted) [reset = 00_0000h]
      19. 7.6.19TDCx_CLOCK_COUNT4: Clock Count Register (address: 17h, CSBx asserted) [reset = 00_0000h]
      20. 7.6.20TDCx_TIME5: Time 5 Register (address: 18h, CSBx asserted) [reset = 00_0000h]
      21. 7.6.21TDCx_CLOCK_COUNT5: Clock Count Register (address: 19h, CSBx asserted) [reset = 00_0000h]
      22. 7.6.22TDCx_TIME6: Time 6 Register (address: 1Ah, CSBx asserted) [reset = 00_0000h]
      23. 7.6.23TDCx_CALIBRATION1: Calibration 1 Register (address: 1Bh, CSBx asserted) [reset = 00_0000h]
      24. 7.6.24TDCx_CALIBRATION2: Calibration 2 Register (address: 1Ch, CSBx asserted) [reset = 00_0000h]
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. 8.2.2.1Measuring Time Periods Less Than 12 ns Using TDC7201
      3. 8.2.3Application Curves
    3. 8.3CLOCK Recommendations
      1. 8.3.1CLOCK Accuracy
      2. 8.3.2CLOCK Jitter
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Third-Party Products Disclaimer
      2. 11.1.2Related Documentation
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

1 Features

  • Resolution: 55 ps
  • Standard Deviation: 35 ps
  • Measurement Range:
    • Individual Mode 1: 12 ns to 2000 ns
    • Individual Mode 2: 250 ns to 8 ms
    • Combined Operation: 0.25 ns to 8 ms
  • Low Active Power Consumption: 2.7 mA
  • Supports up to 10 STOP Signals
  • Autonomous Multi-Cycle Averaging Mode for Low Power Consumption
  • Supply Voltage: 2 V to 3.6 V
  • Operating Temperature –40°C to +85°C
  • SPI Interface for Register Access

2 Applications

  • Range Finders
  • LIDAR
  • Drones and Robotics
  • Advanced Driver Assistance Systems (ADAS)
  • Collision Detection Systems
  • Flow Meters

3 Description

The TDC7201 is designed for use with ultrasonic, laser and radar range finding equipment using time-of-flight technique. The TDC7201 has two built-in Time-to-Digital Converters (TDCs) that can be used to measure distance down to 4 cm and up to several kilometers using a simple architecture, which eliminates the need to use expensive FPGAs or processors.

Each TDC performs the function of a stopwatch and measures the elapsed time (time-of-flight or TOF) between a START pulse and up to five STOP pulses. The ability to measure simultaneously and individually on two pairs of START and STOP pins using two built-in TDCs offers high flexibility in time measurement design.

The device has an internal self-calibrated time base which compensates for drift over time and temperature. Self-calibration enables time-to-digital conversion accuracy in the order of picoseconds. This accuracy makes the TDC7201 ideal for range finder applications.

When placed in the Autonomous Multi-Cycle Averaging Mode, the TDC7201 device can be optimized for low system power consumption, which is ideal for battery-powered flow meters. In this mode, the host can go to sleep to save power and wake up when interrupted by the TDC upon completion of the measurement sequence.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
TDC7201nFBGA (25)4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified LIDAR Application Block Diagram

TDC7201 lidar_bd_snas686.gif