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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
4
Pins Description:
Pin
Name
Description
Pin
Name
Description
1
I_O
Input/Output
11
Driver_O Transducer driving output
2
HP_O
High pass filter output
12
Ftrace
Frequency tracing input
3
HP_I
High pass filter input
13
ORC1
RC oscillator: terminal 1
4
LP_O
Low pass filter output
14
ORC2
RC oscillator: terminal 2
5
LP_I
Low pass filter input
15
ORC3
RC oscillator: terminal 3
6
TCG_O
Time controlled gain output
16
CLK
System clock
7
TCG_I
Time controlled gain input
17
GND
Ground
8
GR_O
External adjustable gain output
18
Vreg
Regulated voltage for internal
analogue devices
9
GR_I
External adjustable gain input
19
Vcc
Power supply
10
ECHO
Receiving echo input
20
Vref
Reference voltage output
Application Circuit
: for car reversing aids (values should be changed for other applications)
Vref
Vref
Vcc
Vreg
Vcc
Vref
Vref
Vref
Vref
Vcc
Vcc
High Level Pulse
Echo
470p
1
2
3
100
10K
MMBT3904
6.8K
39K
IFT
1
3
2
4
Ultrasonic Transducer
BSS123
20K
BAV99
220u
47K
100u
100u
100u
22p
10n
680p
470p
4.7K
680p
4.7K
2200p
2.7K
13K
1
2
3
1
2
3
1K
BAV99
18
3
17
4
15
9
6
20
16
14
8
5
11
19
13
12
2
17
10
R2
R3
R1
660KHZ
C1
D1
D2
R4
C2
MCU
PW0268
400EP14D
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