Datasheet KMT32B Datasheet (HL)

MAGNETIC ANGLE SENSOR
KMT32B

Preliminary
HLP Confidential

Preliminary Data Sheet

KMT32B

Axel Bartos

HL PLANARTECHNIK GmbH • Hauert 13 • 44227 Dortmund • Germany • www.hlplanar.de

[e-mail] • phone: [phone] • fax: [phone]

KMT32B_PreliminaryDataSheet (2004-04-13).doc Last update 13.04.04

Vcc2

Br.2

Br.1

Vcc

MAGNETIC ANGLE SENSOR
KMT32B

Preliminary
HLP Confidential

LEGAL DISCLAIMER

This product is not designed for use in life support appliances, devices or systems where malfunction of this product can
reasonably be expected to result in personal injury. HL Planartechnik GmbH customers using or selling this product for use in such
applications do so at their own risk and agree to fully indemnify HL Planartechnik GmbH for any damages resulting from such
improper use or sale.

This data sheet contains target specifications for product development which my be subject to changes without notice.

GENERAL DESCRIPTION

The KMT32B is a magnetic field sensor based on the anisotropic magnetoresistance effect. The sensor
contains two parallel supplied Wheatstone bridges, which enclose a sensitive angle of 45 degrees.

A rotating magnetic field in the surface parallel to the chip (x-y plane) will deliver two independent
sinusoidal output signals, one following a cos(2α) and the second following a sin(2α) function, α being
the angle between sensor and field direction (see figure 2).

15

10

5

y

0

0 90 180 270 360

-5

Uo/Ucc [mV/V]

-10

-15

[deg]

αααα

bridge 1 (cosine) bridge 2 (sine)

α

field direction

Fig. 2

Figure 1: Characteristic curves for KMT32B

The KMT32B is suited for high precision angle measurement applications under low field conditions
(regular 25 kA/m, with reduced accuracy applicable down to 8 kA/m; beware of earth’s magnetic field !).

CIRCUIT DIAGRAM

Fig. 3

-Vo1

GND

+Vo1

1

-Vo2

-Vo2

HL PLANARTECHNIK GmbH • Hauert 13 • 44227 Dortmund • Germany • www.hlplanar.de

[e-mail] • phone: [phone] • fax: [phone]

KMT32B_PreliminaryDataSheet (2004-04-13).doc Last update 13.04.04

MAGNETIC ANGLE SENSOR
KMT32B

CHARACTERISTIC VALUES (PRELIMINARY)

S

YMBOL

cc,max

tot

U

NIT

MIN TYP MAX C

V 10

mA 4

mW TBD @T= TBD °C

°C

°C

-40 +150

-25 +150

P

ARAMETER

A. Operating Limits

max. supply voltage

max. current (single bridge)

power dissipation

operating temperature

storage temperature

V

I

cc,max

P

Top

Tst

B. Sensor Specifications (T=25 °C)

Preliminary
HLP Confidential

ONDITION

Supply voltage

Resistance (single bridge)

Signal amplitude

Offset voltage

angular inaccuracy

angular hysteresis

Vcc

Rb

∆

V/Vcc

V

off

∆α

∆α

H

V 5 8.5

Ω

mV/V 17 20 Condition A, B

mV/V -1 0 +1 Condition A, B

deg 0.05 0.2 Condition A, B

deg 0.1 Condition A, B

2400 3000 3600

C. Sensor Specifications

TC of amplitude

TC of resistance

TC of offset

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the
limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of this specification is not implied. Exposure to limiting
values for extended periods may affect device reliability.

TCSV

TCBR

TCVoff

%/K -0.36 -0.32 -0.28 Condition A, C

%/K +0.27 +0.32 +0.37 Condition A, C

µV/V/K -4 0 +4 Condition A, C

HL PLANARTECHNIK GmbH • Hauert 13 • 44227 Dortmund • Germany • www.hlplanar.de

[e-mail] • phone: [phone] • fax: [phone]

KMT32B_PreliminaryDataSheet (2004-04-13).doc Last update 13.04.04

MAGNETIC ANGLE SENSOR
KMT32B

MEASUREMENT CONDITIONS

S

YMBOL

P

ARAMETER

A. Set Up Conditions

U

NIT

C

ONDITION

Preliminary
HLP Confidential

ambient temperature T °C

supply voltage

applied magnetic field H kA/m H=25 kA/m

Vcc

V Vcc=5 V

B. Sensor Specifications (T=25 °C, 360° turn , H=25 kA/m , Vo

signal amplitude

signal offset

angular hysteresis

angular inaccuracy

∆

V/V

Voff

∆α

∆α

H

mV/V

mV/V Voff=Vo

deg

deg

T = 23±5 °C (unless otherwise noted)

>0, Vo

max

∆V/V=Vo

∆α

H = MAX|

max. angular difference between left and right turn

∆α=

MAX|

max. angular difference between actual value
measured angle; offset voltage error contributions not
included

max

max

α

- Vo

+ Vo

α

left turn

-α|

0

min

min

-

α

right turn

|

C. Sensor Specifications (T=-25°C, +125°C)

ambient temperatures T °C T1=-25 °C, T0=+25 °C, T2=+125 °C

TC of amplitude

TCSV

%/K

∆

V

1

=

TCV

−

V

⋅

)(

TT

12

−

T

∆

V

T

V

∆

min

V

1

V

)(

<0)

T

α

and

0

)()(

12

%100

⋅

TC of resistance

TC of offset

TCBR

TCVoff

HL PLANARTECHNIK GmbH • Hauert 13 • 44227 Dortmund • Germany • www.hlplanar.de

[e-mail] • phone: [phone] • fax: [phone]

%/K

µV/(VK)

=

TCR

TCVoff

1

⋅

)(

−

TT

12

=

−

TR

−

)(

TT

−

12

)()(

TRTR

12

⋅

)(

1

)()(

TVoffTVoff

12

%100

KMT32B_PreliminaryDataSheet (2004-04-13).doc Last update 13.04.04

MAGNETIC ANGLE SENSOR
KMT32B

Preliminary
HLP Confidential

PIN LAYOUT KMT32B

LAYOUT PIN SYMBOL DESCRIPTION

1 -Vo1 negative output bridge 1 (sin)

2 -Vo2 negative output bridge 2 (cos)

3 Vcc2 positive supply voltage bridge 2

4 Vcc1 positive supply voltage bridge 1

5 +Vo1 positive output bridge 1 (sin)

6 +Vo2 positive output bridge 2 (cos)

7 GND common ground

8 GND common ground

PAD LAYOUT KMT32B CHIP

LAYOUT PAD SYMBOL DESCRIPTION

ORDERING CODE

KMT32B chip TBD

1 -Vo1 negative output bridge 1 (sin)

2 -Vo2 negative output bridge 2 (cos)

3 Vcc2 positive supply voltage bridge 2

4 Vcc1 positive supply voltage bridge 1

5 +Vo1 positive output bridge 1 (sin)

6 +Vo2 positive output bridge 2 (cos)

7 GND common ground

8 GND common ground

KMT32B SM8 TBD

HL PLANARTECHNIK GmbH • Hauert 13 • 44227 Dortmund • Germany • www.hlplanar.de

[e-mail] • phone: [phone] • fax: [phone]

KMT32B_PreliminaryDataSheet (2004-04-13).doc Last update 13.04.04