MAXQ7667

16-Bit, RISC, Microcontroller-Based, Ultrasonic Distance-Measuring System

Lowest Cost, Complete Solution for Ultrasonic Sensors in Automotive Body-Electronics and Industrial Applications


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Description

The MAXQ7667 smart system-on-a-chip (SoC) provides a time-of-flight ultrasonic distance-measuring solution. The device is optimized for applications involving large distance measurement with weak input signals or multiple target identification. The MAXQ7667 features high signal-to-noise ratio achieved by combining flexible electronics with the intelligence necessary to optimize each function as environmental and target conditions change.

An integrated burst signal generator and echo reception components process ultrasonic signals between 25kHz and 100kHz. Echo reception components include a programmable gain low-noise amplifier (LNA), a 16-bit sigma-delta ADC to digitize the received echo signals, and digital signal processing (DSP). DSP limits noise with a bandpass filter, and creates an echo envelope through demodulation and lowpass filtering. Input referred noise is a low 0.7µVRMS. A programmable phase-locked loop (PLL) frequency synthesizer supplies the reference frequency for the burst generator and the clock for the echo receiver's digital filter. An embedded 16-bit MAXQ20 microcontroller (µC) controls all the preceding functions.

The µC optimizes the burst frequency and reception frequency for each transmission at any temperature. The MAXQ7667 achieves smart sensing by monitoring the echo signals and then actively changing the transmitted and received parameters to obtain optimum results. Digital filtering and burst synthesis do not require CPU intervention. This leaves all the CPU power available for echo optimization, communication, diagnostics, and additional signal processing.

The MAXQ7667 operates with three different power supply voltages: +5V, +3.3V, and +2.5V. Two internal linear regulators allow operation from a single +5V supply when three external power supplies are not available. Alternatively, the MAXQ7667 can control an external pass transistor to allow operation from a single supply voltage of +8V to +65V or more, depending on the external component tolerance. The device is available in a 48-pin LQFP package and is specified to operate from -40°C to +125°C.

Note: Designers must have the following documents to fully use all the features of this device. This data sheet contains pin descriptions, feature overviews, and electrical specifications. Errata sheets contain deviations from published specifications. The user's guides offer detailed information about device features and operation.
MAXQ7667: Typical Application Circuit/Functional Diagram MAXQ7667: Typical Application Circuit/Functional Diagram Enlarge+

Key Features

  • Smart Analog Peripherals
    • Dedicated Ultrasonic Burst Generator
    • Echo Receiving Path (Includes LNA, Sigma-Delta ADC)
    • 5-Channel, 12-Bit SAR ADC with 250ksps Sampling Rate
    • Internal Bandgap Voltage Reference for the ADCs (Also Accepts External Voltage Reference)
  • Timer/Digital I/O Peripherals
  • High-Performance, Low-Power, 16-Bit RISC Core
  • Program and Data Memory
  • Crystal/Clock Module
  • 16 x 16 Hardware Multiplier with 48-Bit Accumulator, Single Clock Cycle
  • Power-Management Module
  • JTAG Interface
  • Universal Asynchronous Receiver-Transmitter (UART)
  • Local Interconnect Network (LIN)

Applications/Uses

  • Automation
  • Automotive Parking
  • Handheld Devices
  • Industrial Processing
  • Vehicle Security

See parametric specs for Sensor Signal Conditioners (10)


Part NumberSensing ElementPGA GainCalibration MethodOutput TypeICC
(mA)
InterfaceMicrocontroller/CPUDACs/ADCsVSUPPLY
(V)
Package/PinsBudgetary
Price
typSee Notes
MAXQ7667 Ultrasonic Transducer60 to 1000 (22 gains)Integrated microcontroller with FLASH memoryDigital25
LIN
SPI
UART
Microcontroller (16-bit, 16 MHz)12-bit ADC4.5 to 5.5
LQFP/48
TQFN/48
$10.02 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAXQ7667EVKIT: Evaluation Kit for the MAXQ7667

Technical Documents

User Guide 4824 MAXQ7667 User's Guide
App Note 4398 MAXQ7667 Transducer Diagnostics

Additional Resources

MAXQ7667 User's Guide (PDF)
Request Reliability Report for: MAXQ7667 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Type ID Title
User Guide 4824 MAXQ7667 User's Guide
App Note 4398 MAXQ7667 Transducer Diagnostics