Rainbow-electronics MAXQ7667 Manual de usuario descargar pdf

General 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 dis-

tance 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 pro-

grammable 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 0.7µV

RMS

. 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 pre-

ceding 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 trans-

mitted 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, diag-

nostics, 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 sup-

ply when three external power supplies are not avail-

able. 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 avail-

able in a 48-pin LQFP package and is specified to

operate from -40°C to +125°C.

Applications

Features

o 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)

o Timer/Digital I/O Peripherals

o High-Performance, Low-Power, 16-Bit RISC Core

o Program and Data Memory

o Crystal/Clock Module

o 16 x 16 Hardware Multiplier with 48-Bit

Accumulator, Single Clock Cycle

o Power-Management Module

o JTAG Interface

o Universal Asynchronous Receiver-Transmitter

(UART)

o Local Interconnect Network (LIN)

MAXQ7667

16-Bit, RISC, Microcontroller-Based,

Ultrasonic Distance-Measuring System

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4598; Rev 1; 7/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, go to: ww.maxim-ic.com/errata

Pin Configuration appears at end of data sheet.

See the

Detailed Features

section for complete list of features.

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

/V denotes an automotive qualified part.

Denotes a lead(Pb)-free/RoHS-compliant package.

PART PIN-PACKAGE

RAM

(KB)

FLASH

(KB)

MAXQ7667AACM/V+

48 LQFP 4 32

Automotive Parking

Vehicle Security

Industrial Processing

Automation

Handheld Devices

1 2 3 4 5 6 ... 39 40

MAXQ7667 1

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General DescriptionThe MAXQ7667 smart system-on-a-chip (SoC) provides atime-of-flight ultrasonic distance-measuring solution. Thedevice is optimized f

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MAXQ7667Echo Receive PathLow-Noise Amplifier (LNA)The LNA provides a 40V/V fixed gain to the input signal.The differential inputs of the LNA are ECHOP

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MAXQ766716-Bit, RISC, Microcontroller-Based,Ultrasonic Distance-Measuring SystemMaxim cannot assume responsibility for use of any circuitry other than

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