Honeywell HMC1051, HMC1052 User Manual

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HMC1051 / HMC1052

1 AND 2-AXIS MAGNETIC SENSORS

Features

· Small 8-Pin SIP or 10-Pin MSOP Packages

· Two AMR Bridges in One Package

· Wide Field Range of +/- 6 Gauss

· 1.0 mV/V/gauss Sensitivity

· High Accuracy Compassing (Error <0.01°)

· Low Power Operation Down to 1.8V

· Patented On-chip Set/Reset Straps

Product Description

The Honeywell HMC1051Z and HMC1052 are high
performance magnetoresistive sensor designs on a
single chip. The advantages of these patented chips
include perfectly orthogonal two-axis sensing
(HMC1052), ultra small size and low power capability in
miniature surface mount packages.

SENSOR PRODUCTS

Each of the magnetoresistive sensors are configured
as a 4-element wheatstone bridge to convert magnetic
fields to differential output voltages. Capable of sensing
fields below 0.1 milligauss, these sensors offer a
compact, low cost, high sensitivity and highly reliable
solution for low field magnetic sensing.

APPLICATIONS

HMC1052 Circuit Diagram

· Compassing

· Navigation Systems

· Attitude Reference

· Traffic Detection

· Medical Devices

· Position Sensing

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 1 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799

HMC1051 / HMC1052

SENSOR PRODUCTS

SPECIFICATIONS

Characteristics Conditions* Min Typ Max Units

Bridge Elements

Supply Vbridge referenced to GND 1.8 2.5 20 Volts

Resistance Bridge current = 1mA 800 1000 1500 ohms

Field Range Full scale (FS) – total applied field -6 +6 gauss

Sensitivity Set/Reset Current = 0.5A 0.8 1.0 1.2 mV/V/gauss

Bridge Offset Offset = (OUT+) – (OUT-)

Field = 0 gauss after Set pulse

Bandwidth Magnetic signal (lower limit = DC) 5 MHz

Noise Density @ 1kHz, Vbridge=5V 50 nV/sqrt Hz

Resolution 50Hz Bandwidth, Vbridge=5V 120

Disturbing Field Sensitivity starts to degrade.

Use S/R pulse to restore sensitivity.

Max. Exposed

No perming effect on zero reading 10000 gauss

Field

Operating

Ambient -40 125 °C

Temperature

Storage

Ambient, unbiased -55 150 °C

Temperature

Sensitivity

Tempco

Bridge Offset

Tempco

Bridge Ohmic

TA=-40 to 125°C, Vbridge=5V

T

=-40 to 125°C, Ibridge=5mA

A

TA=-40 to 125°C, No Set/Reset

T

=-40 to 125°C, With Set/Reset

A

Vbridge=5V, TA=-40 to 125°C 2100 2500 2900 ppm/°C

Tempco

Sensitivity Ratio of

TA=-40 to 125°C 99 101 103 %

X,Y Sensors

(HMC1052 Only)

X,Y sensor

Sensitive direction in X and Y sensors 0.01 degree

Orthogonality

(HMC1052)

Linearity Error Best fit straight line

+/- 1 gauss

+/- 3 gauss

+/- 6 gauss

Hysteresis Error 3 sweeps across +/-3 gauss 0.06 %FS

Repeatability Error 3 sweeps across +/-3 gauss 0.1 %FS
* Tested at 25°C except stated otherwise.

-2.5 +/-1 +2.5 mV/V

mgauss

20 gauss

-3200 -3000

-2800 ppm/°C

-600

+/-500

ppm/°C

+/-10

0.1

0.5

%FS

1.8

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 2 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799

HMC1051 / HMC1052

SENSOR PRODUCTS

SPECIFICATIONS
Characteristics Conditions* Min Typ Max Units

Set/Reset Strap

Resistance Measured from S/R+ to S/R- 3 4 5 ohms

Current 0.1% duty cycle, or less,

2msec current pulse

Resistance

TA=-40 to 125°C 3700 ppm/°C

Tempco

Offset Straps

(available on die)

Resistance Measured from OFFSET+ to OFFSET- 12 15 18 ohms

Offset

Constant

Resistance

Field applied in sensitive direction

DC Current

TA=-40 to 125°C 3900 ppm/°C

Tempco
* Tested at 25°C except stated otherwise.

Pin Configurations (Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse.)

HMC1051

Vcc

(3)

0.4 0.5 4 Amp

10 mA/gauss

HMC1051Z Pinout

HMC1052

HMC1051

BRIDGE A BRIDGE B

Vo+(A)

OUT-

GND Plane

(2)

BRIDGE A BRIDGE B

GND2

(3)

(10)

(4)

GND1

(9)

S/R+

S/R+

(6)

(6)

Vo-(A)

(8)

Set/Reset Strap

Vcc

(5)

HMC1052

OUT+

(4)

Set/Reset Strap

OUT-

(7)

GND1(B)

(1)

S/R-

(7)

GND

(1)

S/R-

(8)

GND2(B)

(5)

OUT+

(2)

HONEYWELL

HMC1051Z

12345678

HMC1052 Pinout

678910

HMC
1052

12345

B

A

Web Sites: www.magneticsensors.com Honeywell

www.ssec.honeywell.com Solid State Electronics Center

Email: [e-mail] 12001 State Highway 55

Plymouth, Minnesota 55441-4799

2001 HMC1051/1052 Published Jul 2001 Page 3 1-800-323-8295

HMC1051 / HMC1052

_

f

f

f

_

SENSOR PRODUCTS

Basic Device Operation

The HMC1051 and HMC1052 are single-axis and two-axis linear magnetic sensors designed as a Wheatstone
bridges formed by a magnetoresistive metal film. With the power supply applied to the bridge, the sensors converts
any incident magnetic field in the sensitive direction to a balanced voltage output. The magnetoresistive sensors are
made of a nickel-iron (Permalloy) thin-film deposited on a silicon wafer in pattern of resistive strips. In the presence of
a magnetic field, a change in the bridge resistive elements causes a corresponding change in voltage across the
bridge outputs.

In addition to the bridge circuits, the sensors each have two on-chip magnetically coupled straps; the Offset Strap and
the Set/Reset Strap. The patented straps eliminate the need for external coils surrounding the bridge elements. The
offset strap (available on bare die only) allows for several modes of operation when a direct current is driven through
it. These modes are: 1) Subtraction of an unwanted magnetic field, 2) Zero-ing of the bridge offset voltage, 3) Closed
loop field cancellation, and 4) Auto-calibration of bridge gain. The set/reset strap can be pulsed with high currents for
the following benefits: 1) Enable the sensor to perform high sensitivity measurements, 2) Flip the polarity of the bridge
output voltage, and 3) Periodically used to improve linearity, lower cross-axis effects, and temperature effects.

Application Notes

Low Cost 2-Axis Compass

Very high precision measurements can be made using the HMC1051 and HMC1052 sensors when interfaced with
low noise amplifiers and 12 to 16-bit Analog-to-Digital (A/D) converters. For lower resolution (1°) or low cost compass
applications, 8 or 10-bit A/D converters may be used with general purpose operational amplifiers. Figure 1 shows a
typical 2-axis compassing application using readily available off-the-shelf components.

The basic principle of two-axis compassing is to orient the sensor bridge element horizontal to the ground
(perpendicular to the gravitational field) and to measure the X and Y analog voltages. With the amplified sensor bridge
voltages near-simultaneously converted (measured) to their digital equivalents, the arc-tangent Y/X can be computed
to derive the heading information. See the application notes on compassing at Honeywell Magnetic Sensors website
(www.magneticsensors.com) for basic principles and detailed application information.

Figure 1

5.00k

5.00k

5.00k

5.00k

.1uf

1nf

500k

Vre

1nf

500k

Vre

(2) IRF7507

LMV358

/2

LMV358

/2

U4

U5

500k

500k

U2

set/reset

set/reset

1

0

U3

MAX1118

Vre

enable

data_out

clk

in

Vcc

2.5 to 3.6v

U1

HMC1052

set/reset

offset

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 4 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799

HMC1051 / HMC1052

SENSOR PRODUCTS

Set/Reset Circuit Notes

The set/reset circuit using the IRF7507 dual complementary MOSFETs is shown in Figure 2 with more detail in its H­bridge driven configuration. This configuration is used primarily in battery operated applications were the 0.5 ampere
nominal set/reset pulsed currents are best obtained under low voltage conditions. For operation at normal 3.3 or 5
volt logic levels, a single complementary MOSFET pair can be used in a single ended circuit shown in Figure 3.
Other complementary MOSFET pairs can be used with the caution that the chosen devices should have less than

0.5 ohms ON resistance and be able to handle the needed supply voltages and set/reset currents. Note that even a
1Hz rate of set/reset function draws an average current of less than 2 microamperes.

Figure 2

1mf

Vsr

+

S

-

200W

IRF7509(P)

Vcc

Rset/reset

.1mf

Vsr

IRF7509(P)

S

4W

D

D

S

IRF7509(N)

D

D

S

G

G

G

G

IRF7509(N)

set/reset

_set/reset

Rset/reset

Figure 3

4W

.1mf

1mf

Vsr

+

S

-

D

D

S

IRF7509(P)

G

G

IRF7509(N)

200W

Vcc

set/reset

Magnetic Field Detection

For simple magnetic field sensing applications such Magnetic Anomaly Detectors (MADs) and Magnetometers, a
similar circuit to the compass application can be implemented. In the example circuit in Figure 4, a HMC1051Z
sensor bridge is used with a low voltage capable dual op-amp to detect sufficient intensity of a magnetic field. Uses
of the circuit include ferrous object detection such as vehicle detection, a “sniffer” for moderate currents in nearby
conductors, and magnetic proximity switching. By using two circuits with a HMC1052, a more omni-directional
sensing pattern can implemented. There is nothing special in choosing the resistors for the differential op-amp gain
stages other than having like values (e.g. the two 5kW and the 500kW resistors) matched at 1% tolerance or better to
reject common-mode interference signals (EMI, RFI). The ratio of the 500kW/5kW resistors sets the stage gain and
can be optimized for a specific purpose. The choice of the 5kW value sets impedance loading seen by the sensor
bridge network and should be about 4 kilo-ohms or higher for best voltage transfer or matching.

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 5 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799

HMC1051 / HMC1052

SENSOR PRODUCTS

Vcc

5.0v

U1

HMC1051

set/reset

offset

Figure 4

5.00k

5.00k

Low ESR Tantalum

*

1mf*

FMMT717

.1uf

FMMT617

500k

+-

.1mf

Vcc/2

Vcc

-

TLC072

+

200W

10kW

10kW

500k

U2

0.1mf

0.1mf

10kW

set/reset

Vcc

10kW pot

Threshold Set

-

+

TLC072

output

LED

RLED

RS

Alternating or Direct Current Sensing

The HMC1051 and HMC1052 sensors can be utilized in a novel way for moderate to high current sensing
applications using a nearby external conductor providing the sensed magnetic field to the bridge. Figure 5 shows a
HMC1051Z used as a current sensor with thermistor element performing a temperature compensation function for
greater accuracy over a wide range of operational temps. Selection of the temperature compensation (tempco)
resistors used depends on the thermistor chosen and is dependant on the thermistor’s %/°C shift of resistance. For
best op-amp compatibility, the thermistor resistance should be above about 1000 ohms. The use of a 9-volt alkaline
battery supply permits fairly common operational amplifiers such as the 4558 types to be used. Note that the circuit
must be calibrated based on the final displacement of the sensed conductor to the measuring bridge. Typically, an
optimally oriented measurement conductor can be placed about one centimeter away from the bridge and have
reasonable capability of measuring from tens of milliamperes to beyond 20 amperes of alternating or direct currents.
See application note AN-209 for the basic principles of current sensing using AMR bridges.

tempco

R

1mf*

+-

Si1553DL

b

U2

Vcc =9Vdc

network

200W

U3

standoff distance

Vcc = 9Vdc

I

ac

I

dc

set/reset

U1

HMC1051

offset

Figure 5

5.00k

5.00k

.1mf

-

RC4558

+

500k

Vcc/2 ~ +4.5Vdc

*

Low ESR Tantalum

.1uf

500k

-

RC4458

+

R

a

R

th

output

set/reset

Conductor to be

Current Measured

Web Sites: www.magneticsensors.com Honeywell

www.ssec.honeywell.com Solid State Electronics Center

Email: [e-mail] 12001 State Highway 55

Plymouth, Minnesota 55441-4799

2001 HMC1051/1052 Published Jul 2001 Page 6 1-800-323-8295

HMC1051 / HMC1052

A

AN0AN1AN2A

SENSOR PRODUCTS

Three Axis Compassing with Tilt Compensation

For full three-axis compassing, the circuit depicted in Figure 6 shows both a HMC1051Z and a HMC1052 used for
sensing the magnetic field in three axes. A two-axis accelerometer is also shown to provide pitch and roll (tilt)
sensing to correct the three-axis data into to the corrected two-axis heading. The accelerometer can be substituted
with a fluidic 2-axis tilt sensor if desired. For lower voltage operation with Lithium battery supplies (2.5 to 3.6Vdc), the
Set/Reset circuit should be upgraded from a single IRF7507 to the dual IRF7507 implementation to permit a
minimum 1.0 ampere pulse (0.5 ampere per set/reset strap resistance) to both the HMC1052 and HMC1051 sensors.

Vcc

3.3 to 5.0v

Vcc

set/reset

offset

set/reset

U1

HMC1052

U2

Figure 6

5.00k

5.00k

5.00k

5.00k

.1uf

500k

500k

IRF7507

1nf

Vcc/2

1nf

Vcc/2

.1mf

LMV324

U3

LMV324

U4

500k

500k

500k

Vcc

Two-axis

accelerometer

Vcc

set/reset

U5

N3Vcc/2

DO0

U6

m

C

with

Multiplexed

/D Conv.

5.00k

5.00k

500k

HMC1051

-

+

Vcc/2

LMV324

xout

yout

DI0

DI1

Duty Cycling for Lower Energy Consumption

For battery powered and other applications needing limited energy consumption, the sensor bridge and support
electronics can be switched “off” between magnetic field measurements. The HMC1051Z and HMC1052 are very low
capacitance (Bandwidth > 5MHz) sensor bridges and can stabilize typically before the support electronics can. Also
minimizing the quantity of set/reset pulses will save energy too. Figure 7 shows a simple supply switching circuit that
can be microprocessor controlled to duty cycle (toggle) the electronics in moderate current (<25mA) applications.

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 7 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799

HMC1051 / HMC1052

To Sensor Circuits

Figure 7

MMBT2907ALT1

0.01mf

Vcc

SENSOR PRODUCTS

Vcc

+

10mf

-

Gnd

* Used when Vcc = 5.0 volts, jumper

when using Vcc = 3.3 volts or less.

PACKAGE DRAWING 8-PIN SIP

*MMBD7001LT1

Symbol Millimeters

Symbol Millimeters

10kW

A1

D
E

H

A

A1

B
D

E1

e

E

L1

mC

Off

On

Min Max

A

1.371 1.728

0.101 0.249

B

0.355 0.483

9.829 11.253

3.810 3.988

e

1.270 ref

6.850 7.300

h

0.381 0.762

Min Max

- 1.10

0.05 0.15

0.15 0.30

2.90 3.10

2.90 3.10

0.50 BSC

4.75 5.05

0.95 BSC

toggle

Inches x 10E-3

Min Max

54 68

4 10
14 19
387 443
150 157

50 ref
270 287
15 30

Inches x 10E-3

Min Max

-43

2.0 5.9

5.9 11.8
114 122
114 122

2.0 BSC
187 199

37.4

Ordering Information

Ordering Number Product

HMC1051Z One Axis Magnetic Sensor – SIP8 Package

HMC1052 Two Axis Magnetic Sensors – MSOP8

Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey any
license under its patent rights nor the rights of others.

Web Sites: www.magneticsensors.com Honeywell

Email: [e-mail] 12001 State Highway 55

2001 HMC1051/1052 Published Jul 2001 Page 8 1-800-323-8295

www.ssec.honeywell.com Solid State Electronics Center

Plymouth, Minnesota 55441-4799