S40000_技术文档

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Ultrasonic Sonar Ranging IC - PW0268

Features:

z Operating Voltage: 6 – 10Vdc single source

z Operating Frequency: broadband output ranging up to 250KHz

z Variable R/C Oscillator: compensates for transducer resonate

frequency drift due to temperature.

z High Gain Amplifier: varies with time over 32 steps

z Integrated Band Pass Filter: reduces external component count

z Bi-direction I/O Pin: simplifies the control function for

transmitting a pulse and receiving an echo

z An adjustable System Clock: enables the control of, the

number of pulses transmitted, the slope of the variable gain

amplifier, and the pulse repetition rate.

z The PW0268 IC is suitable for use in car reversing aids,

electronic tape measures and other sonar ranging applications.

SSOP20

Description:

The PW-0268 ultrasonic sonar ranging IC is ideally suited for echo ranging systems. This chip has many design

features to enhance its performance and ease of use in this application.

The externally tunable RC Oscillator automatically tracks and compensates for the shift of the resonate frequency

of the transducer due to temperature changes.

The Fix Gain Preamplifier can be tailored to compensate for varying transducer sensitivities. The 32-step Time

Controlled Variable Gain Amplifier slope can be modified by adjusting the frequency of the system clock.

An onboard Comparator converts the analog signal of the returning echo to a TTL level digital signal for use with

an external microprocessor.

The integrated Band Pass Filters can be adjusted for custom applications by changing a few external components.

The frequency of the System Clock can be adjusted to control other operating parameters of the chip including the

transmit pulse width and sample rate.

The I_O pin, (pin 1) is a bi-direction pin and is designed as an open collector connection with an internal pull high

resistor. When the I_O pin is being pulled low by an external transistor, the RC oscillator generates a tone burst

signal at DRIVER_0 (pin 11), the output driver stage for the transducer. After the transmit pulse, the I_O pin, (pin 1)

will again go low if a valid echo signal is detected.

The reflected echo signal is presented to the first stage pre-amplifier through ECHO (pin 10). The gain of

pre-amplifier can be adjusted to accommodate transducers with varying sensitivities by changing an external

resistor between ECHO (pin 10) and GR_I (pin 9).

The 32 steps time controlled variable gain amplifier input TCG_I (pin7) and output TCG_O (pin 6) is synchronized

to start incrementing at the end of control pulse signal I-O, (pin 1) and is reset at the beginning of the next control

pulse.

Only a few passive components are needed for the active band pass filter. There are two stages, a low pass, LP_I

(pin 5) and LP_O (pin 4) and upper band pass, HP_I (pin 3) to HP_O (pin 2). The center frequency and

bandwidth of the filter are chosen based on the type of ultrasonic transducer being used and the specific application.

The amplified echo signal after being filtered is routed to a comparator, which shapes and coverts the analog echo

signal into digital signal outputted at I_O (pin 1) for further µP handling.

The unique temperature compensating Ultrasonic R/C Oscillator circuitry tracks the resonant frequency drift of the

transducer that is causes by environment temperature changes. Simply adding dual diodes and one resistor between

DRIVER_O (pin 11) and Ftrace (pin 12) is all that is needed to complete this function.

1

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Block Diagram

Vref

20

Vcc

Vreg

18

GND

17

CLK

16

ORC3

15

ORC2

14

ORC1

13

Ftrace

12

Driver_O

11

19

System

Clock

Sensor

Driver

4V Regulator

Ultrasonic R/C Oscillator

Auto Frequency

Tracking

Timer

High-Speed

Comparator

Control

Center

32 Steps

TCG Amp

Fixed Gain

Amp

Band-pass Filter

1st Pre-Amp

1

2

3

4

5

6

7

8

9

10

I_O

HP_O

HP_I

LP_O

LP_I

TCG_O

TCG_I

GR_O

GR_I

ECHO

Pin Assignment

1

2

3

4

20

19

18

17

16

15

14

13

12

11

I_O

HP_O

HP_I

Vref

Vcc

Vreg

GND

CLK

LP_O

LP_I

TCG_O

TCG_I

GR_O

GR_I

5

6

7

8

9

ORC3

ORC2

ORC1

Ftrace

Driver_O

10

ECHO

2

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Specifications:

Unless otherwise specified, all data measured under Vcc = 9V, F = 40KHz

Parameter

Symbol

Vcc

Icc

Vreg

Vlr

Condition

Vreg = 4V

Min.

5.5

8

3.8

-3.0

Typ. Max. Unit

Supply Voltage

Supply Current

Regulated Voltage

Stability of Vreg

Reference Voltage

11

14

5

V

mA

V

Vcc = 6 ~ 10V

Vcc = 6 ~ 10V , ± 3%

Vcc = 6 ~10V ,

RL>2KΩ

11

4

0

+3.0

%

Vref

SR

0.4

5

0.44

-

0.5

-

Vreg

V/µS

mV

Op-Amp Slew Rate

Comparator Trigger

Level

Vin = 3Vpp

Tcomp

Over Vref

300

350

400

System Clock

Frequency

System Clock

R=33KΩ，C=22pF

CLKf

CLKr

Foscf

610

0.001

38

660

-

710

KHz

1500 KHz

Frequency Range

Ultrasonic Oscillation

Frequency

Ultrasonic Oscillation

Frequency Range

2^ndAmp Gain

Time Controlled Gain

Amplifier

Bandwidth of 2nd Amp

R=5.6K，C=1000pF

40

-

42

KHz

Foscr

GR

0.001

500

29

-1

34

150

-

30

0

35

170

20

-20

0.3

0.2

0.9

0.05

31

+1

36

200

40

-80

0.4

-

dB

KHz

mA

Min(1x, 0dB)

Max(58x, 35.2dB)

Gain = 50dB

Driver_O

TCGain

GRbw

Idrv

Isink

I_OVIH

I_OVIL

I_OVOH

I_OVOL

Driving Current

Driver_O

-

Vcc

Input Voltage Level

Output Voltage Level

0.15

-

0

1

-

Input Low Level

Current

I_O Internal Pull Up

Resistance

I_OIOL

Rup

-

-10

5

-20

6.5

mA

3.5

KΩ

Absolute Maximum Ratings

Description

Symbol

Vcc

Condition

Min.

0

Max.

12

Unit

V

Supply Voltage

℃

Operation Temperature

Topr

Tstg

-40

-65

-0.3

-10

+85

℃

Storage Temperature

Max. Pin Input Voltage

Max. Input Current

+150

Vcc+0.3

Vreg+0.3

+10

I_O，Vcc

Others

*

V

Vimax

Iimax

mA

*To prevent latch up, the instantaneous input current should be no large than 100mA for each pins.

3

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Pins Description:

1

Name

I_O

Description

Input/Output

Name

Description

11 Driver_O Transducer driving output

2

3

4

5

6

7

8

HP_O

HP_I

LP_O

LP_I

High pass filter output

High pass filter input

Low pass filter output

Low pass filter input

12

13

14

15

16

17

18

Ftrace

ORC1

ORC2

ORC3

CLK

Frequency tracing input

RC oscillator: terminal 1

RC oscillator: terminal 2

RC oscillator: terminal 3

System clock

Ground

Regulated voltage for internal

analogue devices

TCG_O Time controlled gain output

TCG_I Time controlled gain input

GR_O External adjustable gain output

GND

Vreg

9

10

GR_I

External adjustable gain input

19

20

Vcc

Vref

Power supply

Reference voltage output

ECHO Receiving echo input

Application Circuit: for car reversing aids (values should be changed for other applications)

Vref

Vcc

Ultrasonic Transducer

400EP14D

BAV99

D1

3

4

100

220u

1

2

Vref

Vcc

Vreg

20K

R4

C2

D2

R3

1K

22p R1

IFT

C1

47K

R2

Vref

100u

BSS123

Vcc

660KHZ

15

20

19

18

17

16

14

13

12

11

3

2

1

3

2

1

3

2

1

6.8K

PW0268

MMBT3904

10K

1

2

3

4

5

6

7

8

9

10

Echo High Level Pulse

2200p

4.7K

2.7K

470p

BAV99

10n

MCU

39K

680p 680p

13K

470p

Vref

4

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Application Note

The circuit shown on page 4 is a typical circuit for car reversing aids. The RC Oscillator generates a tone burst

when a low level pulse is applied to the I_O pin, (pin 1).

To accommodate tolerance variations of transducers during manufacturing, a 1K-ohm variable resistor (R1) is

provided to trim the output operating frequency. The range of adjustment is from 38.0 – 42.0 KHz. and allows for a

better match of the drive signal to the resonate frequency of the transducer.

The active burst number (number of pulses transmitted) is controlled by the pulse width of the low level signal

applied to the I_O pin, (pin 1).

The tone burst output, Driver_O (pin 11), drives the transducer through a MOSFET transistor and impedance

matching transformer IFT. The inductance in the secondary winding of the transformer is designed to tune out the

reactance of the parallel capacitance of the transducer.

The high output voltage of the tone burst is snubbed by two diodes and the returning echo signal is passed on to the

first stage pre-amplifier. The signal is then passed on to the second stage fix gain amplifier and finally to the third

stage 32-step time controlled variable gain amplifier. The gain of the pre-amplifier should be properly set to meet

the sensitivity needs of the transducer and application requirements.

The center frequency of band-pass filter should be chosen to exactly match the frequency of the RC Oscillator and

considerations for the width of pass-band filter should be made based on actual application requirements.

If the amplified echo signal from the output of the band pass filter exceeds 0.35V + Vref, the comparator will

output a low pulse to the I_O pin, (pin 1). The width of the low level pulse is proportional to the echo signal

strength.

The above description is summarized in the signal timing charts illustrated below.

MCU output: H: 1ms/Div., V: 2.0V/Div.

The RC oscillator will be enabled in the

duration of input pulse. The maximum

pulse width is 396/F and any time longer

than this upper limit will be ignored.

Driver_O (Pin 11): H: 1ms/Div., V: 2.0V/Div.

Transducer Oscillation: H: 1ms/Div., V: 50V/Div.

HP_O (Pin 2): H: 1ms/Div., V: 2.0V/Div.

The next input pulse will be ignored if

the pulse repetition rate is shorter than

9900/F + pulse width.

F: Frequency of system clock

Output at Pin 1 I_O: H: 1ms/Div., V: 5.0V/Div.

5

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

The resonate frequency of ultrasonic piezo transducers varies in an inversely proportional relationship to

temperature. The lower the temperature, the higher the resonate frequency, the higher the temperature the lower

the resonate frequency.

This property of piezo transducers may cause a mismatch between transducer and drive signal with changes in

ambient temperature and reduces efficiency of the system when the frequency of the drive circuit remains constant

and does not track the resonate frequency shift of the transducer.

Therefore it is desirable to have the output frequency of the drive source track the resonate frequency of the

transducer with changes in ambient temperature. The Auto Frequency Tracking circuitry between Ftrace, (pin 12),

and Drive_O, (pin 11) is used to accomplish this task.

The voltage change at Ftrace (pin 11) varies in proportion to the forward bias voltage change across diodes D1, D2.

This change is caused by the negative temperature coefficient of the diodes and the ratio of the resistor circuit

R2/R3.

A lower temperature increases the voltage drop across the diodes. This intern accelerates the charge rate of an

internal integrator circuit controlling the R/C Oscillator, ORC3, (pin15). The net result is the adjustment to the

R/C Oscillator increases the resonate frequency of the output, Drive_O, (pin11).

Conversely, a higher temperature decreases the voltage drop across the diodes. This slows the charge rate of the

internal integrator circuit controlling the R/C Oscillator. The net result of this adjustment is to decrease the resonate

frequency of the output Drive_O, (pin 11).

Choose values for the components R1, R2, R3 and C1 that will best track the characteristic resonate frequency shift

curves due to temperature for a specific transducer.

Recommended values for the following transducers are listed below.

Used Transducer

400EP14D

R1(Ohm)

3,300

R2(Ohm)

1,500

0

R3(Ohm)

511

C1(pF)

2,200

220

400EP18A

235AC130

3,300

2,000

604

2,100

For a fixed output of 40KHz at Drive_O (pin 11) simply remove D1, D2 and R2 and set R1 = 4,500 Ohm, C1 =

2,200 pF, and R3 = 511 Ohm.

The system clock CLK (pin 16) controls the maximum input pulse width, the slope of time controlled gain

amplifier and pulse repetition rate.

For example, as illustrated in the block diagram, if the system clock is set to 660KHz (C2: 22pF, R4: 47K Ohm),

then:

(1) The maximum input pulse width is 396/F = 396/660K = 0.6 ms and any duration longer than 0.6ms will be

ignored.

(2) The step duration of the 32 step time controlled gain amplifier is equal to 220/F = 0.333 ms, starting from

the end of the pulse on the I_O pin, (pin 1).

(3) The minimum pulse repetition rate is 9900/F + pulse width = 9900/F + 0.5 ms (20 bursts of 40KHz) =

9900/660K + 0.5 = 15.5 ms.

For long distance measurements of 18 meters (one way distance), the system clock should be set as follows:

Min. Pulse Repetition Rate = 9900/F + 0.75 = 166 mS (30 bursts of 40KHz)

Frequency of System Clock F = 60 KHz

For additional information about an 18-meter tape measure circuit, please consult with the factory.

6

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Time Controlled Gain Amplifier

40

35

30

25

20

15

10

5

0

5

10

15

20

25

30

35

Steps

The time controlled gain amplifier is stepping up once the input pulse falling. The time duration can be

calculated as:

T = 220/F

F: Frequency of System Clock

7

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Package and Dimensions:

20 Pins, SSOP (150mil)

8

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

9

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Symbol

A

Min.

0.053

0.004

0.049

0.008

0.006

Nom.

Max.

-

0.069

0.010

0.065

0.012

0.011

0.010

0.009

A1

A2

b

-

b1

c

0.010

-

c1

0.008

D

0.341 BSC

E

0.236 BSC

E1

e

0.154 BSC

0.025 BAS

L

0.016

-

0.050

L1

L2

R

0.041 REF

0.010 BAS

0.003

0°

-

R1

θ

-

8°

15°

-

θ1

θ2

aaa

bbb

ccc

ddd

eee

5°

-

0°

0.004

0.008

0.004

0.007

0.004

10

Pro-Wave Electronics Corp.

Tel: 886-2-22465101

Fax: 886-2-22465105

E-mail: sales@pro-wave.com.tw

URL: http://www.prowave.com.tw

Notes:

1. Dimensioning and tolerancing per ANSI Y14.5M-1982.

2. Dimensions in inches (angles in degrees)

3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or

gate burrs shall not exceed 0.006” per end. Dimension E1 does not include interlead flash or

protrusions. Interlead flash or protrusions shall not exceed “0.006” per side. D1 and E1

dimensions are determined at datum H.

4. The package top may be smaller than the package bottom. Dimensions D and E1 are determined

at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs

and interlead flash, but including any mismatch between the top and bottom of the plastic.

5. Datum A and B to be determined at datum H.

6. N is the maximum number of terminal position. (N=20)

7. The dimensions apply to the flat section of the lead between 0.004 to 0.010 inches from the lead

tip.

8. Dimension b does not include dambar protrusion. Allowable dambar protrusion shall be 0.004”

total in excess of b dimension at maximum material condition. The dambar can not be located

on the lower radius of the foot.

9.

Refer to JEDEC MO-137 variation AD.

JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION

11

Sonar Ranging Module

SRM400

The SRM400 is a sonar ranging module

utilizing our new developed Sonar Ranging IC,

PW-0268, which can work with all our PT or

EP type transducers. SRM400 provides as a

shortcut to develop car reversing systems or

some other distance measurement systems for

design engineers who are not very familiar

with analog circuit and/or the operation of

ultrasonic transducers. By using this module

engineers can focus firstly on the other fields of

digital circuit and software designs as well as

some other mechanical issues. After first stage

then you can either design your own analog

circuit based on the module construction or

consult with factory for making your own

module for your special needs.

Specification:

Operation voltage

Operation current

Oscillation frequency Variable RC oscillator

Amplifier gain

DC6 - 10V

<20 mA ＠DC10V

Pre-Amplifier

14 dB

2^ndStage Amplifier 30 dB

Time controlled 32 35 dB max.

steps main

Features:

z

Operating Voltage: 6 – 10Vdc single source

Operating Frequency: broadband output

amplifier

Bandpass filter

Fc: 38 KHz

ranging up to 250KHz

Bandwidth: 20KHz

Insertion loss: 1 dB

130Vpp;

z

Built-in variable RC oscillator matching

transducers with different frequencies

High Gain Amplifier: varies with time over

32 steps

Integrated Band Pass Filter: reduces

external component count,

Bi-direction I/O Pin: simplifies the control

function for transmitting a pulse and

receiving an echo

An adjustable System Clock: enables the

control of, the number of pulses transmitted,

the slope of the variable gain amplifier, and

the pulse repetition rate

Driving voltage

(no load)

Bi-directional I/O

pulse width 0.5ms

Input signal Open collector pull low

Output 0..05*Vcc to 0.9*Vcc

digital echo signals

Measuring distance

25 – 150 cm

SRM400 includes:

1. Module board

z

2. 400EP14D enclosed type transducer of

asymmetrical beam patterns, see detail

specification of 400EP14D.

3. Detail electrical schematic

Board size: 27.9 * 18 mm (L*W)

S. Square Enterprise Company Limited

Pro-Wave Electronics Corporation

P.O. Box 1-70 Chung Ho, Taiwan, ROC; E-mail: prowave@ms3.hinet.net; Tel: 886-2-22465101(5 lines), 22459774; Fax: 886-2-22465105

http://www.s2.com.tw ; http://www.prowave.com.tw

Sonar Ranging Module

SRM400

Electronic Circuit Diagram

Vref

Vcc

Test "C"

BAV99

1.5K

3

4

100

220u

1

2

Vref

Vcc

Vreg

2200p

20K

1K

IFT

400EP14D

Vref

User

Side

47K

22p 3.3K

100u

511

BSS123

Vcc

Ultrasonic Transducer

660KHZ

15

20

19

18

17

16

14

13

12

11

3

2

1

3

2

1

3

2

1

Test "B"

6.8K

PW0268

MMBT3904

10K

1

2

3

4

5

6

7

8

9

10

2200p

4.7K

2.7K

10n

BAV99

Echo High Level Pulse

10n

33K

Test "F"

680p 680p

13K

Test "A"

Test "D"

MCU

Test "E"

470p

Vref

Waveforms at different test points:

works with transducer model 400EP14D against a hard target of size of 20cmL*20cmW*1cmT at distance of 50cm

“A” Point: Control Pulse (from MCU) “B” Point: Tone bursts Signal

H: 0.5ms/div

V: 5V/div

H: 0.5ms/div

V: 5V/div

“C” Point: Transducer loading

“D” Point: 1^stPre-Amplifier

H: 0.5ms/div

V: 50V/div

H: 0.5ms/div

V: 20mV/div

“E” Point: Main 32 Steps TCG Amplifier

“F” Point: Digital Echo signal Output

H: 0.5ms/div

V: 1V/div

H: 0.5ms/div

V: 5V/div

Refer to PW-0268 Sonar Ranging IC for detail information.

Quartz Crystals & Matching Transformers

Miniature Tuning Fork Quartz Crystals

Specification

Model Nominal Tolerance Temperature

Stability

Load

Series

Shunt

Drive

Number Frequency at 25ꢀC –10ꢀC to +70ꢀC Capacitance Resistance Capacitance Level

Hz

40,000

32,768

pF

12.5

Ohm

35,000

pF

2.3

mW

0.001

PPM

±60

±20

PPM

±45

±30

S40000

S32768

Matching Transformers

3

2

1

4

6

Specification

Parts Number

K4000001

K4000002

K4000003

K4000004

Operating Frequency

40.0 KHz

Variable Inductance (min.)

Unloaded Q (min.)

Turn Ratio

10.6 mH± 6% 10.6 mH± 6% 10.6 mH± 6% 10.6 mH± 6%

70

1:10

100

1:10

25

1:10

47

1:10

Matching Transducer

400EP14D

(Temperature

Compensated

Type

235SR130

400EP18A

S. Square Enterprise Company Limited

Pro-Wave Electronics Corporation

P.O. Box 1-70 Chung Ho, Taiwan, ROC;E-mail: prowave@ms3.hinet.net;Tel: 886-2-22465101(5 lines), 22459774;Fax: 886-2-22465105

http://www.s2.com.tw ; http://www.prowave.com.tw


型号：	S40000
厂家：	ETC
描述：	Ultrasonic Sonar Ranging IC 超声波测距声纳IC
文件：	总14页 (文件大小：369K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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