TMR40XX GEARTOOTH SENSOR
TMR geartooth sensor with high sensitivity to magnetic field
MultiDimension Technology(MDT®) Phone：0512-56366222 Internet：www.dowaytech.com
Address : No. 7 Guangdong Road Zhangjiagang Free Trade Zone Jiangsu, China
Postcode : 215634 Fax：0512-56366200 E-Mail：sales@dowaytech.com
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Technical Information Ver.2018-06
General
The TMR40XX magnetic geartooth sensors utilize a unique push-pull Wheatstone
bridge design, including one or two Wheatstone full bridges, with four or eight
unshielded high sensitivity TMR sensing elements. The Wheatstone bridge creates a
differential voltage output with respect to the magnetic field gradient along the
sensor’s sensitive direction. In the dual-bridge configuration, the two orthogonal
Wheatstone full bridges provide sine and cosine voltage signals that can be used to
measure both the gear tooth position and the direction of motion. The TMR40XX
magnetic geartooth sensors offer superior performance with high sensitivity to the
magnetic field gradient. They can detect very small changes in magnetic field, along
with good temperature stability of the output signal.
The TMR40XX magnetic gear tooth sensors are available in 14 different standard
spacings of 0.25mm、0.4mm、0.50mm、0.6mm、0.75mm、0.8mm、1.0mm、1.2mm、
1.4mm、1.6mm、1.8mm、2.0mm、3.0mm and 4.0mm.
Two types of small form factor LGA packages are available. The package dimensions are 3mm × 3mm ×
0.9mm and 3mm × 6mm × 0.9mm.
Features and Benefits
Tunneling Magnetoresistance (TMR) Technology
High Saturation Point Allowing Operation under Large DC Magnetic Field
Wide Air-Gap Tolerance
High Sensitivity to Magnetic Field Gradient
Capable of Small-Pitch Gear Tooth Detection
DC(Zero-Speed) Operation
Sine/Cosine Signal Outputs with Precise Phase Shift
Excellent Thermal Stability
Good Immunity to Environmental Magnetic Field
Compact Ultra-Thin Package
Typical Applications
Gear Tooth Motion, Speed, and Direction Sensing
Linear and Rotary Speed Sensing
Linear and Rotary position Sensing
Linear Magnetic Scales
Magnetic Encoders
LGA6L(3×3×0.9)
LGA6L(3×6×0.9)
TMR40XX GEARTOOTH SENSOR
TMR geartooth sensor with high sensitivity to magnetic field
MultiDimension Technology(MDT®) Phone：0512-56366222 Internet：www.dowaytech.com
Address : No. 7 Guangdong Road Zhangjiagang Free Trade Zone Jiangsu, China
Postcode : 215634 Fax：0512-56366200 E-Mail：sales@dowaytech.com
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Absolute Maximum Ratings
PARAMETER
SYMBOL
LIMIT
UNIT
Supply Voltage
V
CC
7
V
Reverse Supply Voltage
H
RCC
7
V
Magnetic Field
He
1500
Oe
⑴
ESD Voltage
V
ESD
4000
V
Operating Temperature
T
A
-40~125
°C
Storage Temperature
Tstg
-50~150
°C
Electrical & Magnetic Characteristics (V
CC
=1.0V, T
A
=25 °C, Differential Output)
PARAMETER
SYMBOL
CONDITION
MIN
TYPICAL
MAX
UNIT
Supply Voltage
V
CC
Operating
1
7
V
Supply Current
I
CC
Output Open
67
⑵
μA
Bridge Resistance
R
15
⑶
kOhm
Single Resistor Sensitivity
SEN
0.46
%△R/Oe
Saturation Field
Hsat
±70
⑷
Oe
Linear Range 1
LIN1
LIN≥98%
±20
Oe
Linear Range 2
LIN2
LIN≥95%
±40
Oe
Offset Voltage
Voffset
-20
20
mV/V
Hysteresis
Hys
Fit@±20Oe
1
%FS
Maximun Differential Voltage Output
Vout
Max
650
mV/V
Temperature Coefficient of Resistance
TCR
H=0 Oe
-985
PPM/°C
Temperature Coefficient of Sensitivity
TCS
-1800
PPM/°C
Note:
(1) 1 Oe (Oersted) = 1 Gauss in air = 0.1 millitesla = 79.8 A/m.
(2) Supply current is determined by the resistance of the sensor.
(3) Custom sensor resistance may be available upon request.
(4) The sensors may saturate if the magnetic field exceeds this range. Saturation field can be custom designed to meet special requirements.
Usage Method
P
p
p=P/2
Direction of Sensitivity