Datasheet

Maxim Integrated │ 4
www.maximintegrated.com
Evaluates: MAXQ7667
MAXQ7667 Evaluation Kit
EV Kit Extended Features
The EV kit includes options for a single transducer or a
dual transducer. The MAXQ7667 allows the user to work
with one transducer (for transmit and receive) or with two
transducers (one for transmit and one for receive). Using
one transducer is cheaper and the solution becomes
smaller; however, the transducer cannot receive while it
is still ringing from the excitation during transmit. There
are different transducers on the market with different ring
times, but typically when using one transducer you cannot
measure distances smaller than appriximately 20cm to
40cm (the EV kit transducer is ringing for ~ 40cm).
To use one transducer, make sure only TRANSD1 is
mounted and TRANSD2 is not mounted on the PCB. R21
and R22 must also be populated with 0Ω resistors and
R23 left open.
To use two transducers, make sure TRANSD1 and
TRANSD2 are populated. R21 and R22 have to be open
and R23 has to be populated.
The MAXQ7667 can be powered with an external supply
voltage up to 25V. To do that, make sure thar R1 and R2
are open (not populated). You can then supply external
supply to JP1.
Table 1. EV Kit Connector JP1 Description
Table 2. EV Kit Connector JP2 Description Table 3. EV Kit Connector JP3 Description
JP1 PIN # LABEL FUNCTION
1 V+
If R2 is not mounted, 6V to 25V
supply.
If R2 is mounted, 5V supply
2 GND Ground pin.
JP2 PIN # LABEL FUNCTION
1 +
External transducer 1 + (only if
on-board transducer is removed).
If R21 and R22 are populated,
then transmit and receive. Do not
mount transducer 2 in that case
(R23 should not be populated in
that mode).
2 -
External transducer 1 - (only if
on-board transducer is removed).
If R21 and R22 are populated,
then transmit and receive. Do not
mount transducer 2 in that case
(R23 should not be populated in
that mode).
JP3 PIN # LABEL FUNCTION
1 +
External transducer 2 + (only if
on-board transducer is removed).
Use transducer 2 only if R22 is
mounted and R21 and R22 are
not mounted.
2 -
External transducer 2 - (only if
on-board transducer is removed).
Use transducer 2 only if R22 is
mounted and R21 and R22 are
not mounted.