User Manual

ManualsBrandsDigilent ManualsInfrared & Light SensorsDigilent Pmod Time of Flight Sensor

21/02/2020 Pmod ToF Reference Manual [Reference.Digilentinc]

https://reference.digilentinc.com/reference/pmod/pmodtof/reference-manual?_ga=2.11378417.475818879.1582283268-1306234254.1582101049 6/9

For more details about the calibration process, see the ISL29501's Calibration Guide (https://reference.digilentinc.com/lib/exe/fetch.php?

tok=f06809&media=https%3A%2F%2Fwww.renesas.com%2Feu%2Fen%2Fwww%2Fdoc%2Fapplication-note%2Fan1983.pdf).

(https://reference.digilentinc.com/_detail/reference/pmod/pmodtof/txrx.png?id=reference%3Apmod%3Apmodtof%3Areference-manual)

A measurement cycle of Pmod ToF is triggered by a falling edge on the sample start (SS) pin, or by the host board issuing a soft_start to

the ISL29501's command register via I2C. When performing a measurement, the chip emitter driver transmits a modulated square wave

(Tx) at a given frequency optical signal ( ) through the emitter. The received optical signal (Rx) returns with a phase shift and

attenuation depending on the distance and reflectivity of the object it bounced off of. The distance from the object is calculated by

determining the phase shift of the return signal as shown below:

Where:

D is the distance of the object from the sensor.

is the modulation frequency.

is the phase difference between the emitted and return signals.

C is the speed of light.

Header J1 Header J2 Jumper Blocks

Pin Signal Description Pin Signal Description Jumper State Description

1 IRQ Interrupt 1 IRQ Interrupt JP3 Enabled communication enabled on IRQ

line

2 SS Sample Start 2 SS Sample Start JP4 Enabled communication enabled on SS

line

3 SCL Serial Clock 3 SCL Serial Clock JP1 Enabled 2.2 kΩ resistors enabled on the

SCL line

4 SDA Serial Data 4 SDA Serial Data JP2 Enabled 2.2 kΩ resistors enabled on the

SDA line

5 GND

()

Power Supply

Ground

5 GND

()

Power Supply

Ground

6 VCC

()

Power Supply

(3.3V)

6 VCC

()

Power Supply

(3.3V)

The jumper settings when using the demos are JP1: Enabled, JP2: Enabled, JP3: Enabled, JP4: Enabled.

Any external power applied to the Pmod ToF must be within 2.7 V and 3.3 V to ensure that the on-board chips operate correctly;

however, it is recommended that Pmod is operated at 3.3 V. The Pmod ToF does not draw more than 225 mA of current.

Measurements

fmod

= ∗ Δ

(1)

4 ∗

∗

fmod

Pinout Table Diagram