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Microcontroller
(MSP430)
Pulsed
Laser Diode
Transmission lens
Receiving lens
Detector
Photo
Diode
Object
START1
STOP1
TDC7201
START2
STOP2
DI, DO, CLK
3
CSBx
2
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TDC7201
SNAS686 –MAY 2016
TDC7201 Time-to-Digital Converter for Time-of-Flight Applications in LIDAR,
Range Finders, and ADAS
1
1 Features
1
• 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
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