Data Sheet

Pin Descriptions
Pin
Type
Function
GND
Ground
Common Ground (0 V supply)
VIN
Power
The module will operate between 3.3V to 5V DC. The VIN
voltage also sets the logic-high level voltage for the SIG pin.
SIG
I/O*
PWM or Serial data input / output
* When in PWM mode, the SIG pin operates as an open collector input, with a 55 k-ohm
pull-down resistor, except for response pulses, which are driven to VIN. When in serial mode,
the SIG pin operates as a push-pull output.
End-user access of the test pads, beyond changing the default mode upon startup from PWM to
Serial, is not supported.
Pad
Type
Function
DBG
Open collector
Coprocessor programming pin (PC1)
SCK
Open collector
Coprocessor programming pin (PB5)
SCL
Open collector
Laser sensor I2C clock with 3.9K pull-up to 3V
RESET
Open collector
Coprocessor programming pin (PC6)
SDA
Open collector
Laser sensor I2C serial data with 3.9K pull-up to 3V
MOSI
Open collector
Coprocessor programming pin (PB3)
INTD
Push Pull
(active low)
Laser sensor Data Ready Interrupt
Normally logic high, this pin drives low when a new value is
available, and reverts to high once the value is read.
MISO
Open collector
Coprocessor programming pin (PB4)
Copyright © Parallax Inc.
LaserPING Rangefinder Module (#28041)
v1.0 1/29/2018 Page 7 of 8