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 Specification: circuit based on the module construction or consult with factory for making your own Operation voltage DC6 - 12V module for your special needs. 30 mA DC12V, Operation current pulse width 0.5ms, Features: 20ms Repetition rate Oscillation frequency Variable RC oscillator Operating Voltage: 6-12Vdc single source Amplifier gain Operating Frequency: broadband output Pre-Amplifier 14 dB ranging up to 250KHz nd 2 Stage 30 dB Built-in variable RC oscillator matching Amplifier transducers with different frequencies Time controlled 32 35 dB max. High Gain Amplifier: varies with time over steps main amplifier 32 steps Bandpass filter Integrated Band Pass Filter: reduces external Fc 38 KHz component count, Bandwidth 20 KHz Insertion loss 1 dB Bi-direction I/O Pin: simplifies the control Bi-directional I/O function for transmitting a pulse and Input signal Open collector pull low receiving an echo 0.05*Vcc to 0.9*Vcc An adjustable System Clock: enables the Output digital echo signals control of, the number of pulses transmitted, Measuring distance 25 150 cm the slope of the variable gain amplifier, and the pulse repetition rate SRM400 includes: Board size: 27.9 * 18 mm (L*W) 1. Module board 2. 400EP14D enclosed type transducer of asymmetrical beam patterns, see detail specification of 400EP14D. 3. Detail electrical schematic S. Square Enterprise Company Limited Pro-Wave Electronics Corporation Http://www.pro-wave.com.tw E-mail: sales pro-wave.com.tw Tel: 886-2-22465101 Fax: 886-2-22465105 1 of 3Sonar Ranging Module SRM400 Electronic Circuit Diagram: S. Square Enterprise Company Limited Pro-Wave Electronics Corporation Http://www.pro-wave.com.tw E-mail: sales pro-wave.com.tw Tel: 886-2-22465101 Fax: 886-2-22465105 2 of 3