CTD206 Current Sense
Module
User Manual
Perry Hunt
1/27/2017
2017 Crocus Technology
Document Number CTD206-UM Revision 0.6 Jan 27, 2017
Page 1
This document provides general information about the design and use of the Crocus CTD206 evaluation
board for current sensing.
GND
J1
PWR
Pin 1
GND
Vout
GND
Pin 1
J2
Figure 1: CTD206 Top View
2017 Crocus Technology
Document Number CTD206-UM Revision 0.6 Jan 27, 2017
Page 2
Contents
1.
2.
3.
General Description .............................................................................................................................. 4
Closed-Loop Circuit ............................................................................................................................... 5
Setup for Evaluation.............................................................................................................................. 5
2017 Crocus Technology
Document Number CTD206-UM Revision 0.6 Jan 27, 2017
Page 3
1. General Description
The CTD206 Current Sensor Evaluation Module is designed to demonstrate the current sensing
capabilities of the Crocus CT219 magnetic sensor. This demo board includes one CT219 current
sensor along with the external components needed to implement a closed-loop feedback
circuit. The CT219 sensor device is soldered onto the PCB with a wire clip mounting location on
either side of it. The clips are used to hold the wire directly above the sensor so that the
magnetic field created by AC or DC current flowing through the wire can be sensed. While AC or
DC current is passing through the wire the CT219 sensor circuit can provide an output voltage
that is proportional to the amount of current flowing through the wire.
This module can be used with many different types and sizes of wire by using the appropriately
sized clip that will prevent the wire from moving relative to the sensor. Accordingly, the wire
needs to be held motionless relative to the sensor. If the wire moves relative to the sensor
there could be unwanted changes in the sensor circuit output (Vout) that could be mistaken for
changes in current or possibly invalidate any software calibration that has been done.
These modules are shipped with metal clips with an inside diameter of 0.187”. If the wire
you’re using has a smaller or larger
diameter you may be required to find a clip that will work
for your application. The standard clip is from KMC Stampings (www.kmcstampings.com).
Plastic clips can also be used, as well as vinyl coated metal clips.
NOTE: If a different clip is used that does not hold the wire directly above the sensor, the circuit
should still work but may have reduced sensitivity. For best results, the wire should be held
directly over the center of the sensor in direct contact with or as close to the sensor as possible.
2017 Crocus Technology
Document Number CTD206-UM Revision 0.6 Jan 27, 2017
Page 4
2. Closed-Loop Circuit
The closed-loop circuit as shown in Figure is designed to provide a feedback path to the bias
currents of the CT219 sensor so that the device is kept in the center of its active region. This is
accomplished by first sensing the output voltage of the half-bridge circuit and then zeroing the
sensors output by changing the field line current of the device. The feedback in the field line
current is used to essentially cancel the effects of the external magnetic field to zero the sensor.
Note: R5 is not normally populated
Figure 2: Circuit Schematic
3. Setup for Evaluation
The evaluation board setup is very simple. One should follow the listed steps below to connect
the evaluation board to test the CTSR219 current sensor:
1. Connect a DC power source (+6 VDC to +12 VDC) to the DC connector labeled J1 on the
board. It is recommended to use the supplied 6VDC AC Adapter for this. There is a
voltage regulator onboard that will convert the supplied power to the 5 volts needed for
the evaluation board.
2. Attach the current carrying wire to the board using the standard or user supplied clips.
3. Connect an oscilloscope or a DVM (DC or AC RMS) to pin 2 of the J2 connector to
measure the output signal. The ground reference can be connected to pin 1 or 3 of J2 or
to the GND test point.
2017 Crocus Technology
Document Number CTD206-UM Revision 0.6 Jan 27, 2017
Page 5
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