汽車防撞模組 SRM400
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汽車防撞模組 SRM400 利用先進技術研發之聲納測距積體電路配合我們, 請參考, 聲納測距積體電路, PW-0268, which can work with all our PT or EP type transducers.
Features
  • Operating Voltage: 6 – 12Vdc single source
  • Operating Frequency: broadband output ranging up ... to 250KHz 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
  • Board size: 27.9 x 18 x12.5 mm (L x W x H)

Specification
Operation voltage DC6 - 12V
Operation current <30 mA ＠ DC12V, pulse width 0.5ms,
≧20ms Repetition rate
Oscillation frequency Variable RC oscillator
Amplifier gain
Pre-Amplifier
 14 dB
2nd Stage Amplifier
 30 dB
Time controlled 32 steps main amplifier

35 dB max.

Bandpass Filter  
Fc
 38KHz
Bandwidth
 20KHz
Insertion loss
 1dB
Bi-directional I/O
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
  2. 400EP14D enclosed type transducer of asymmetrical beam patterns, see detail specification of 400EP14D.
  3. Detail electrical schematic
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