MAXQ7667 Evaluation Kit
Evaluates: MAXQ7667
General Description
The MAXQ7667 evaluation kit (EV kit) demonstrates
distance measurement with the MAXQ7667.
The EV kit includes Windows XP
®
-, Windows
Vista
®
-, and Windows
®
7-compatible software for distance
measurements data acquisition through a USB cable.
Quick Start
Features
●
Windows XP-, Windows Vista-, and Windows 7-
Compatible Software
●
USB-PC Connection (Cable Included)
●
USB Powered (External Power Supply Not Required)
●
Real-Time Data Acquisition through the USB
Ordering Information
appears at end of data sheet.
The EV kit board is a plug-n-play, ultrasound echo acqui-
sition kit that connects to the PC through a USB cable.
The EV kit produces an ultrasound burst and samples the
echo and sends the information back to the PC. Distance
to multiple objects can be calculated from the echo. The
board does not require external power; it is powered
through the USB. The USB-to-serial driver can be down-
loaded from www.ftdichip.com/Drivers/VCP.htm.
The EV kit is preloaded with default firmware that
communicates with the MAXQ7667 evaluation software.
Software can be installed and run on any Windows-based
system.
ULTRA SOUND
TRANSDUCER
ULTRA SOUND BURST GENERATOR
REF
2.5V
LNA
SIGMA DELTA
ADC
MAXQ7667
POWER-SUPPLY
TEMP-SUPPLY (PTC)
5 CH
MUX
SAR
ADC
MAXQ
MICRO-
CONTROLLER
UART
5.0V
FTDI
Figure 1. MAXQ7667 EV-Kit Block Diagram
Windows, Windows XP, and Windows Vista are regis-
tered trademarks and registered service marks of Microsoft
Corporation.
19-5013; Rev 1; 2/14
MAXQ7667 Evaluation Kit
Evaluates: MAXQ7667
Detailed Description
The MAXQ7667 EV kit board is loaded with the
MAXQ7667, Maxim’s integrated ultrasound acquisition
system. It integrates a microcontroller, ultrasound burst
generator, and ultrasound echo receive path. It also inte-
grates power management, a 5-channel 12-bit SAR ADC
as auxiliary analog input, brown-out detection, GPIOs,
UART, SPI port, timers, and a watchdog.
On the EV kiit, the MAXQ7667 communicates through
UART to a USB-to-UART bridge.
This USB-to-UART bridge communicates to the PC. A
GUI that shows the echoes and allows control over the
part is available.
The MAXQ7667 microcontroller is preloaded with
firmware that communicates with the MAXQ7667 GUI
application. Upon receiving the logging command from
the GUI, it sends an ultrasound burst and then acquires
the echo using the echo receive path and the Sigma-Delta
ADC. The data is sent back to the PC through UART for
display and further analysis.
Components of the EV Kit
The EV kit comes with the following components:
1) MAXQ7667 evaluation board
2) USB cable
3) MAXQ7667 GUI application
Data Acquisition through the EV Kit
The following steps are needed to acquire data through
the EV kit:
1) Connect the EV kit board to the PC through the USB
cable. The EV kit board receives power from the USB.
2) Install and run the MAXQ7667 GUI application.
3) The GUI automatically detects the EV kit and starts
sending bursts and receiving the echoes. The echo is
displayed as a graph.
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Maxim Integrated
│
2
MAXQ7667 Evaluation Kit
Evaluates: MAXQ7667
Figure 2. MAXQ7667 GUI Application
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Maxim Integrated
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MAXQ7667 Evaluation Kit
Evaluates: MAXQ7667
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
JP1 PIN #
1
2
LABEL
V+
GND
FUNCTION
If R2 is not mounted, 6V to 25V
supply.
If R2 is mounted, 5V supply
Ground pin.
Table 2. EV Kit Connector JP2 Description
JP2 PIN #
LABEL
FUNCTION
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).
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).
Table 3. EV Kit Connector JP3 Description
JP3 PIN #
LABEL
FUNCTION
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.
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.
1
+
1
+
2
-
2
-
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MAXQ7667 Evaluation Kit
Evaluates: MAXQ7667
Table 4. EV Kit Connector J5 Description
J5 PIN #
1
2
3
4
5
6
7
8
9
10
11
12
LABEL
DVDDIO
AVDD
P1.4 /
MOSI
AIN1
P1.5 /
MISO
AIN0
P1.6 /
SCLK
P0.2
P1.7 / SS
P0.3 / T0 /
ADCCTL
P0.4 / T0B
GND
FUNCTION
5V DVDDIO supply (output up to
~150mA)
3.3V AVDD supply (output up to
~30mA)
GPIO port 1 bit 4 or SPI MOSI
Analog In 1 for SAR ADC
GPIO port 1 bit 5 or SPI MISO
Analog In 0 for SAR ADC
GPIO port 1 bit 6 or SPI SCLK
GPIO port 0 bit 2
GPIO port 1 bit 7 or SPI CS
GPIO port 0 bit 3 or Timer0 or
ADC control input
GPIO port 0 bit 4 or Timer0
Ground pin
Table 5. EV Kit Connector JTAG
Description
JTAG PIN #
1
2
3
4
5
6
7
8
9
10
LABEL
TCK
GND
TDO
+5
TMS
RST
N.C.
N.C.
TDI
GND
FUNCTION
Test clock
Digital ground pin
Test data output
Supply voltage for reference
only
Test mode select
Microcontroller MAXQ610
reset pin
No connect
No connect
Test data Input
Digital ground pin
Component List
DESIGNATION
C1, C4
C2, C3, C6, C7,
C11–C18, C31
C5
C19, C20
C21
C22
C23, C24
C25, C26
QTY
2
13
1
2
1
1
2
2
DESCRIPTION
10µF ±10%, 16V X5R ceramic
capacitors (0805)
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
2.2µF ±10%, 25V X5R ceramic
capacitor (0805)
0.47µF ±10%, 25V X7R ceramic
capacitors (0805)
330pF ±10%, 50V X7R ceramic
capacitor (0603)
0.033µF ±10%, 16V X5R
ceramic capacitor (0603)
470pF ±10%, 200V ceramic
capacitors (0805)
0.01µF ±5%, 25V C0G
ceramic capacitors (0603)
DESIGNATION
C27, C28
C29, C30
D2
D4
IC1
IC2
QTY
2
2
1
1
1
1
DESCRIPTION
470pF ±5%, 50V C0G ceramic
capacitors (0603)
22pF ±5%, 25V NP0 ceramic
capacitors (0603)
BAS28 high-speed dual diode
(SOT143)
MBRS140T3G Schottky diode
(SMB)
Ultrasound PSoC
Maxim MAXQ7667AACM/V+
FT232RQ FTDI USB-to-UART
(QFN)
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Maxim Integrated
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