Data Sheet

Page 8
Web: www.maxbotix.com
PD11500k
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar
®
- WR/WRC
™
Series
MaxBotix Inc., products are engineered and assembled in the USA.
Sensor Timing Diagrams
Power Up Timing
Sensor Free-Run Timing
When operating in free run mode, the HRXL-MaxSonar-WR sensors are designed to be used in a variety of outdoor,
industrial, or indoor environments. Many acoustic noise sources will have little to no effect on the reported range of the
HRXL-MaxSonar-WR sensors
1
. Most range readings are accurately reported
1
. If the range readings are affected, the effect
is typically less than 5-mm
1
. This allows users to employ real-time ultrasonic distance sensing without the need for
additional supporting circuitry or complicated user software.
The HRXL-MaxSonar-WR use an internal filter to process range data. This filter improves the sensor’s performance for
accuracy, noise rejection, and reading to reading stability. The filtering in the free-run operation also permits additional
acoustic and electrical noise tolerance.
On the HRXL-MaxSonar-WR sensors, when pin 4 is left high, the sensor will continue to range, the data output includes a
filter for increased accuracy in environments with acoustic noise. The HRXL-MaxSonar-WR sensors will output the range
based on recent range information. The filter does not affect the speed at which data is made available to the user but
instead allows for more consistent range information to be presented.
Product
Maximum
Refresh
Rate
Pulse
Width
Reported
Serial
Data
Reported
Pin 4
Brought
Low
End of
Range
Cycle
Free
Run
Filter
MB7360, MB7367, MB7380, MB7387 7.5 Hz ~118mS ~123mS ~132mS ~133mS 1.5Hz
MB7364, MB7369, MB7384, MB7389 6.67Hz ~135mS ~140mS ~147mS ~148mS 1.33Hz
MB7363, MB7366, MB7383, MB7386 6Hz ~148mS ~158mS ~165mS ~166mS 1.2Hz
Power up timing has
already occurred
Notes:
1
Refer to section that compares WR to WRC on page 4