SNAS686 May   2016 TDC7201

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 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 LDO
      2. 7.3.2 CLOCK
      3. 7.3.3 Counters
        1. 7.3.3.1 Coarse and Clock Counters Description
        2. 7.3.3.2 Coarse and Clock Counters Overflow
        3. 7.3.3.3 Clock Counter STOP Mask
        4. 7.3.3.4 ENABLE
    4. 7.4 Device Functional Modes
      1. 7.4.1 Calibration
      2. 7.4.2 Measurement Modes
        1. 7.4.2.1 Measurement Mode 1
          1. 7.4.2.1.1 Calculating Time-of-Flight (Measurement Mode 1)
        2. 7.4.2.2 Measurement Mode 2
          1. 7.4.2.2.1 Calculating Time-of-Flight (TOF) (Measurement Mode 2)
      3. 7.4.3 Timeout
      4. 7.4.4 Multi-Cycle Averaging
      5. 7.4.5 START and STOP Edge Polarity
      6. 7.4.6 Measurement Sequence
      7. 7.4.7 Wait Times for TDC7201 Startup
    5. 7.5 Programming
      1. 7.5.1 Serial Peripheral Interface (SPI)
        1. 7.5.1.1 CSBx
        2. 7.5.1.2 SCLK
        3. 7.5.1.3 DIN
        4. 7.5.1.4 DOUTx
        5. 7.5.1.5 Register Read/Write
        6. 7.5.1.6 Auto Increment Mode
    6. 7.6 Register 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. 7.6.10 TDCx_CLOCK_CNTR_STOP_MASK_H: CLOCK Counter STOP Mask High Value Register (address = 08h, CSBx asserted) [reset = 00h]
      11. 7.6.11 TDCx_CLOCK_CNTR_STOP_MASK_L: CLOCK Counter STOP Mask Low Value Register (address = 09h, CSBx asserted) [reset = 00h]
      12. 7.6.12 TDCx_TIME1: Time 1 Register (address: 10h, CSBx asserted) [reset = 00_0000h]
      13. 7.6.13 TDCx_CLOCK_COUNT1: Clock Count Register (address: 11h, CSBx asserted) [reset = 00_0000h]
      14. 7.6.14 TDCx_TIME2: Time 2 Register (address: 12h, CSBx asserted) [reset = 00_0000h]
      15. 7.6.15 TDCx_CLOCK_COUNT2: Clock Count Register (address: 13h, CSBx asserted) [reset = 00_0000h]
      16. 7.6.16 TDCx_TIME3: Time 3 Register (address: 14h, CSBx asserted) [reset = 00_0000h]
      17. 7.6.17 TDCx_CLOCK_COUNT3: Clock Count Registers (address: 15h, CSBx asserted) [reset = 00_0000h]
      18. 7.6.18 TDCx_TIME4: Time 4 Register (address: 16h, CSBx asserted) [reset = 00_0000h]
      19. 7.6.19 TDCx_CLOCK_COUNT4: Clock Count Register (address: 17h, CSBx asserted) [reset = 00_0000h]
      20. 7.6.20 TDCx_TIME5: Time 5 Register (address: 18h, CSBx asserted) [reset = 00_0000h]
      21. 7.6.21 TDCx_CLOCK_COUNT5: Clock Count Register (address: 19h, CSBx asserted) [reset = 00_0000h]
      22. 7.6.22 TDCx_TIME6: Time 6 Register (address: 1Ah, CSBx asserted) [reset = 00_0000h]
      23. 7.6.23 TDCx_CALIBRATION1: Calibration 1 Register (address: 1Bh, CSBx asserted) [reset = 00_0000h]
      24. 7.6.24 TDCx_CALIBRATION2: Calibration 2 Register (address: 1Ch, CSBx asserted) [reset = 00_0000h]
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Measuring Time Periods Less Than 12 ns Using TDC7201
      3. 8.2.3 Application Curves
    3. 8.3 CLOCK Recommendations
      1. 8.3.1 CLOCK Accuracy
      2. 8.3.2 CLOCK Jitter
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
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 NUMBER PACKAGE BODY SIZE (NOM)
TDC7201 nFBGA (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