QUICK START GUIDE
Coto Technology offers the lowest power and highest sensitivity
magnetic sensors in the world. They operate based on tunneling
magnetoresistance (TMR) technology which is more sensitive than
Hall technology and other magnetoresistive technologies. This
demonstration kit permits you to evaluate the performance of sensors
on the board with supplied magnets and/or other magnets.
DEMONSTRATION KIT CONTENTS:
• Auto Turn-on Demonstration Circuit board
• Magnet-1: Cylindrical
bar magnet
• Magnet-2: Ring
magnet with
center post
• Spare Battery:
3V CR2032 coin cell
• Quick Start Guide
DEMO BOARD DESCRIPTION
This demo board operates off a 3V coin cell battery and automatically
turns on when removed from the box. Auto Turn-on function is
enabled using an omnipolar sensor U4 (RR121-1B13-311) and a magnet
installed in the box. This board demonstrates operation of the
following sensors mounted on the PCB.
U1 - High-sensitivity Omnipolar digital sensor RR121-1A23-311
U2 - Dual Output Unipolar digital sensor RR121-2A32-364
U3 - Bipolar digital sensor RR121-3C63-511
U4 - Omnipolar digital sensor RR121-1B13-311 used for Wake-up
U5 - Linear voltage output sensor RR111-1DC2-332
LEDs on the outputs of the digital sensors indicate when the sensor is
triggered. LED array (numbered 1-9) shows voltage output from the
Analog sensor.
Features and Output Characteristics of the sensors and typical
applications are described below.
U1: RR121-1A23-311 High Sensitivity Omnipolar Sensor
B
OPS
= -9G, B
OPN
= 9G, B
RPS
=-5G, B
RPN
= 5G, 10Hz. Activated with
north or south magnet poles. For more details on the sensor and
other options available,
please refer to the RR121
datasheet.
Applications: Security,
Proximity Sensing, Door
Closed/Open Detectors,
Wake-Up Sensors.
U2: RR121-2A32-364 Dual Ouput Unipolar Sensor
B
OPS
= -9G, B
OPN
= 9G, B
RPS
=-5G, B
RPN
= 5G, 20Hz. Activated with
north or south magnet poles. For more details on the sensor and
other options available, please refer to the RR121 datasheet.
Applications: Fluid Flow Sensors, Toggle Switching, Linear Position
Measurement, etc.
U3: RR121-3C63-311 Latching Bipolar Sensor
B
OPS
=-10G, B
RPN
=10G,
500Hz. Activated with south
pole, stays latched. De-acti-
vated with north pole. For
more details and other
options available, please
refer to the RR121 datasheet.
Applications: Rotation Sensing
such as in Utility Meters, RPM
Counting, and Reciprocating
Systems.
U5: RR111-1DC2-332 Analog Sensor
Ratiometric analog output;
Sensitivity: -20mV/V/G.
Analog output is proportion-
al to the magnetic field
strength and polarity. When
no magnet is present,
output is at V
DD
/2. For more
details, please refer to the
RR111 d ata she et .
Applications: This sensor can be used to measure precise magnet linear or
rotation position using the analog output.
CIRCUIT BOARD OPERATION
Remove the board from the box. This will cause U4 (RR121-1B13-311) to
turn on power to the board, and will light up the centrally located red
Power Indicator LED. Also note that the LED-5 (red) will also be lit,
indicating no magnet present at the RR111.
White arrows on the board indicate the direction of sensitivity for
each sensor. Move the north and south poles of the cylindrical bar
magnet in the direction of the arrows to investigate operation of the
Omnipolar, Unipolar and Bipolar sensors. Approach the RR111 with the
bar magnet and notice how LEDs in the array light up in response to
magnetic field strength from the north and south poles. Insert the
short post of the round magnet into the hole next to U3 -bipolar
sensor, then turn the magnet to demonstrate performance of the
bipolar sensor. Similarly, insert the short post of the round magnet
into the hole next to U5 -the analog sensor, then turn the magnet to
demonstrate use of the RR111 for angle measurement. Use the grid
space and the workbook on the back side of the Quick Start Guide to
make quick measurements with the supplied cylindrical magnet and
other magnets in order to evaluate the performance of the sensors
and magnets.
Please note: If the bar magnet is brought close to the wake-up sensor
(U4), the board will power down, demonstrating the Auto-turn-ON
function.
To turn the board off: Place the board into the box, in the correct
orientation. A magnet embedded in the box will activate the wake-up
sensor U4, which will drive the circuit to power-down the board. U4
consumes only 0.2µA and, therefore, does not drain the battery
appreciably, demonstrating Auto-ON function in power-down mode.
In order to power down the board when outside the box, turn off the
power switch on the bottom side. The switch may be turned back on
prior to placing the board in the box.
During extended normal operation, it is possible that the battery
voltage will drop and, with no magnet present, LED-4 will light up; this
is normal. If LED-4 (yellow) or LED-3 (yellow) is lit when the board is
first removed from the box and a magnet is not present, this indicates
that the battery is approaching depletion. In this case, replace the
battery with the spare. Please also remember to replace the spare
battery in the kit with a fresh 3V battery (CR2032).
TROUBLESHOOTING
If the board does not
power up when removed
from the box, [1] remove
any magnet close to the
wake up sensor U4, [2]
turn ON the switch on
the bottom of the board,
[3] replace the battery.
If the board does not
turn OFF upon placing it
into the box, [1] orient the board correctly in the box, [2] ensure
wake-up magnet is present in the box, [3] turn off the power switch.
How to extend battery life: LEDs and other circuit elements drain the
battery during normal operation. Whenever the board is outside the
box, but not in use, turn off the power switch to conserve battery
energy.
SUPPORT
For Datasheets and a full User’s Guide showing a schematic of the
circuit board, please visit www.cotorelay.com or send an email to
appsupport@cotorelay.com
Copyright Coto Technology 2019. All rights reserved.
Output OFF
Output ON
N - PoleS - Pole
BRPS BRPN
VOUT
BOPN
BOPS
0
N - PoleS - Pole
VOUT
0
1
2
3
4
5
6
789
BOTTOM VIEW
Power
Switch
OFF
ON
3V
CR2032
Output HIGH
Output LOW
N - PoleS - Pole
BRPN
VOUT
BOPS
0
BHYS
rev. 03272019
WAKE-UP SENSOR
POWER
COTO TECHNOLOGY
REDROCK DEMOBOARD
RR1EK3-0002
cotorelay.com
U3
U2
U1 U4 U5
UNIPOLAR
Dual Output
OMNIPOLAR
LINEAR
BIPOLAR
1
2
3
4
5
6
789
OUTPUT2 HIGH
OUTPUT2 LOW
BRP
VOUT
BRP2 BOP2
BOP1 BRP1
BOP
BHYS
BOP BRP 0 0
BHYS
N-PoleS-Pole
OUTPUT1 LOW
OUTPUT1 HIGH
