TMR4101 MULTIDIMENSION | Alldatasheet
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Technical content
High Precision Analog Magnetic Scale Sensor TMR4101
Description
The TMR4101 magnetic scale sensor contains two push-pull half-bridges, each consisting of two high-sensitivity tunnel magnetoresistance (TMR) elements. The layout of the TMR elements matches the width of the magnetic poles. When the sensor moves along the length of the scale, the sensor outputs two quadrature sine wave signals, each corresponding to the width of a pair of magnetic poles. By decoding these two sine wave signals, the relative displacement between the chip and the scale can be accurately measured. The TMR4101 magnetic scale sensor chip uses a small package DFN4L (1.32 mm × 0.66 mm × 0.3 mm), which reduces the requirements for chip installation, making the structural design of the system more flexible and convenient for assembly in narrow spaces. MultiDimension Technology can provide magnetic scale medium with customizable lengths as the accessory of TMR4101 to meet our customers’ needs. Features and Benefits
- Tunneling magnetoresistance (TMR) technology
- Detects magnetic scale period of 0.8 mm
- High sensitivity
- Wide operating voltage range
- Allows for larger air gap
- Analog voltage outputs for A and B phases
- Good temperature stability
- RoHS & REACH compliant
Applications
- Camera Autofocus System
- Gear motion speed and direction detection
- Linear and angular velocity sensing
- Linear and curved displacement measurement
- Magnetic scale and magnetic encoder DFN4L X 0.4mm VCC / 2 VPP （TMR position） VBVA Dual-phase signal output (VA, VB) Datasheet MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ Version 1.2.1
Part Number Output Supply Voltage Operating Temperature Package Packing Form TMR4101D Analog 1 V to 6 V -30 °C to 90°C DFN4L Tape & Reel Selection Guide of Magnetic scale Part Number Pole Pitch Length* Width Thickness Packing Form MLT1080-005010 0.4 mm 5.0 mm 1.0 mm 0.55 mm Tray MLT1080-010010 0.4 mm 10.0 mm 1.0 mm 0.55 mm Tray *Note: The length of the magnetic scale can be customized. Please contact local MDT sales representatives for more details. High Precision Analog Magnetic Scale Sensor MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ TMR4101
of the chip are shown in Figure 1. Figure 1. Functional block diagram Figure 2. Sensing direction of TMR4101 variation of the output signal, as shown in Figure 3. Figure 3. Dual-phase signal output (VA, VB) Figure 4. Pin configuration (DFN4L)
1 VA Phase A output
2 GND Ground
3 VB Phase B output
4 VCC Supply voltage
MultiDimension Technology Co., Ltd.
- Absolute Maximum Ratings of Sensor Parameters Symbol Min. Max. Unit Supply voltage VCC - 6.5 V ESD performance (HBM) VESD(HBM) - 1.5 kV ESD performance (CDM) VESD(CDM) - 500 V Operating ambient temperature TA -30 90 °C Storage ambient temperature TSTG -40 125 °C 5. Absolute Maximum Ratings of Magnetic Scale Parameters Symbol Min. Max. Unit Operating ambient temperature TA -30 90 °C Storage ambient temperature TSTG -40 90 °C Note: The maximum value parameters in the limit parameters are only to ensure that the chip and accessories will not be permanently damaged. For normal operating conditions, please refer to the electrical performance parameters and magnetic performance parameter tables. 6. Electrical Specifications of Sensor VCC = 1.0 V, TA = 25 °C Parameter Symbol Condition Min. Typ. Max. Unit Supply voltage VCC - - 1 6 V Bridge resistance RB B = 0 Gs 5 - 10 kΩ Magnetoresistance ratio MR - 20 35 50 % Phase A signal offset drift VOFFSETA B = 0 Gs -10 0 10 mV/V Phase B signal offset drift VOFFSETB B = 0 Gs -10 0 10 mV/V Differential signal offset drift VOFFSETA-B B = 0 Gs -10 - 10 mV/V Temperature coefficient of bridge resistance TCRB -30 °C to 90 °C - -0.06 - %/°C Temperature coefficient of magnetoresistance ratio TCMR -30 °C to 90 °C - -0.1 - %/°C Temperature coefficient of offset TCOFF -30 °C to 90 °C - 0 - mV/°C 7. Electrical Specifications of Magnetic Scale Air gap = 0.15 mm, VCC = 1.0 V, TA = 25 °C Parameter Symbol Min. Typ. Max. Unit Peak to peak output VPP 130 160 190 mV Peak fluctuation VPEAK FLUCTUATION - - 20 mV Valley fluctuation VVALLEY FLUCTUATION - - 20 mV High Precision Analog Magnetic Scale Sensor MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ TMR4101
- Magnetic Specifications of Sensor
Figure 5. VPP versus maximum magnetic field
- Magnetic Specifications of Magnetic Scale
MultiDimension Technology Co., Ltd.
- Specifications Definition of Sensor
10.4 Drift of zero-point differential output VOFFSETA-B
10.3 Drift of zero-point offset VOFFSET
10.2 Magnetoresistance ratio MR
10.1 Bridge resistance RB
Resistance between VCC and GND, this value can be customized according to customer specifications. T1 = TA (Min) = -30°C, T2 = TA (Max) = 90°CTCRB = × 100%RB (T2) - RB (T1) RB (25°C) × (T2-T1) T1 = TA (Min) = -30°C, T2 = TA (Max) = 90°CTCOFF = VOFFSET (T2) - VOFFSET (T1) T2-T1 T1 = TA (Min) = -30°C, T2 = TA (Max) = 90°CTCMR = × 100%MR (T2) - MR (T1) MR (25°C) × (T2-T1) MR = R1: The value of RB at +75 Gs R2: The value of RB at -75 Gs R2 - R1 VA0: Output voltage of phase A at 0 Gs VB0: Output voltage of phase B at 0 Gs VOFFSETA = VA0 - VCC / 2 VCC VOFFSETB = VB0 - VCC / 2 VCC VOFFSETA-B = VOFFSETA - VOFFSETB
10.5 Temperature coefficient of bridge resistance TCRB
10.6 Temperature coefficient of magnetoresistance ratio TCMR
10.7 Temperature coefficient of offset TCOFF
High Precision Analog Magnetic Scale Sensor MultiDimension Technology Co., Ltd. http://www.dowaytech.com/en/ TMR4101
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