SRM400 [ETC]
Sonar Ranging Module; 声纳测距模块
| 型号： | SRM400 |
| 厂家： | 
ETC |
| 描述： | Sonar Ranging Module |
| 文件： | 总2页 (文件大小：108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
2nd Stage Amplifier 30 dB
Time controlled 32 35 dB max.
steps main
Features:
z
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
z
z
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
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
100u
100u
511
BSS123
Vcc
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
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
Vref
Vref
Signals at different test points:
works with transducer model 400EP18A 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: 1st Pre-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.
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