6 Gauss, Low Noise 2-axis
Magnetic Sensor
MMC246xMT
FEATURES
Fully integrated 2-axis magnetic sensor and
electronic circuits requiring fewer external
components
Superior Dynamic Range and Accuracy:
6 G FSR with 16/14 bit operation
0.25 mG per LSB resolution
0.8 mG total RMS noise
Enables heading accuracy <1
Wide operating Voltage ( 1.62 V ~ 3.6 V )
Single 1.8 V supply capable
1.8 V I/O compatibility.
Low power consumption ( 50 A @ 7Hz )
20 nA power down current function
SET/RESET Function
Allows for elimination of temperature
variation induced offset error (Null Field
output)
total RMS noise, enabling heading accuracies of <1 in
Clears the sensors of residual
electronic compass applications.
magnetization resulting from exposure
to strong external fields
Contact MEMSIC for access to advanced calibration
and tilt-compensation algorithms.
On-chip sensitivity temperature
compensation
An integrated SET/RESET function provides for the
2
I C Slave, FAST (400 KHz) mode
elimination of error due to Null Field output change with
temperature. In addition it clears the sensors of any
Low Profile package 2 x 2 x 1 mm
residual magnetic polarization resulting from exposure
RoHS compliant
to strong external magnets. The SET/RESET function
can be performed for each measurement or periodically
APPLICATIONS
as the specific application requires.
Electronic Compassing
GPS Navigation Assist The MMC246xMT is packaged in an ultra-small low
profile LGA package (2 x 2 x 1 mm) and operates over
Magnetic Field Measurement
a temperature range from -40 to 85 C.
2
DESCRIPTION
The MMC246xMT provides an I C digital output with
The MMC246xMT is a complete 2-axis magnetic sensor 400 KHz, fast mode operation.
2
with on-chip signal processing and integrated I C bus.
The device can be connected directly to a
microprocessor, eliminating the need for A/D converters
or timing resources. It can measure magnetic fields
within the full scale range of 6 G (gauss), with 0.25 mG
per LSB resolution in 16 bit operation mode and 0.8 mG
Information furnished by MEMSIC is believed to be accurate and reliable.
MEMSIC, Inc.
However, no responsibility is assumed by MEMSIC for its use, or for any
One Technology Drive, Suite 325, Andover, MA01810, USA
infringements of patents or other rights of third parties which may result from
Tel: +1 978 738 0900 Fax: +1 978 738 0196
its use. No license is granted by implication or otherwise under any patent or
www.memsic.com
patent rights of MEMSIC.
MEMSIC MMC246xMT Rev D Page 1 of 15 5/30/2014
SPECIFICATIONS: (Measurements at 25 C, unless otherwise noted; VDA = VDD= 1.8 V unless otherwise specified)
Parameter Conditions Min Typ Max Units
Field Range (each axis) Total applied field 6 gauss
1
V 1.62 1.8 3.6 V
DA
Supply Voltage
2 1
V (I C interface) 1.62 1.8 3.6 V
DD
Supply Voltage rising time 5.0 mS
2 BW[1:0]=00, 16bit mode 50 60 A
Supply Current
BW[1:0]=01, 16bit mode 25 30 A
(7measurements/second)
(Max = Mean +4 at 25 C)
BW[1:0]=10, 14bit mode 20 25 A
3
Power Down Current 20 50 nA
Operating Temperature -40 85
C
Storage Temperature -55 125
C
Linearity Error H 6 gauss 0.25
applied
%FS
(Least Squares Line) H 4 gauss 0.15
applied
Hysteresis 6 gauss 0.1 %FS
Repeatability Error 6 gauss 0.25 %FS
Alignment Error degrees
0.5 1.0
Transverse Sensitivity 0.2 1.0 %
BW[1:0]=00, 16 bit mode 0.8 mG
Total RMS Noise BW[1:0]=01, 16 bit mode 1.0 mG
BW[1:0]=10, 14 bit mode 2.5 mG
Output resolution 16/14 bits
4
0.5 1.0 degrees
Heading accuracy
6 gauss -3 +3 %
Sensitivity
14 bit mode 1024 counts/G
16 bit mode 4096 counts/G
Initial sensitivity matching
%
1
( X to Y)
Sensitivity Change over -40 ~ 85 C
-5 +5 %
Temperature
6 gauss
Sensitivity Change over
%
1
Temperature Matching ( X to Y)
6 gauss -0.2 +0.2 G
Null Field Output 14 bit mode 8192 counts
16 bit mode 32768 counts
Null Field Output Change over
Delta from 25C
mG
120
5
Temperature
Null Field Accuracy over
-40 to 85C 2 mG
temperature using SET/RESET
Disturbing Field 8 G
Maximum Exposed Field 10000 G
1
1.62 V is the minimum operation voltage. Both V and V should be equal to or greater than 1.62 V
DA DD
2
Supply current is proportional to the number of measurements performed per second. See page 2 and 6 for
additional information.
3
See Supplemental Performance Characteristics for typical current change over temperature
4
Noise, resolution and accuracy specifications enable a typical heading accuracy calculation of 0.5 degrees. Actual
heading accuracy depends upon user system design and algorithms.
5
This error can be eliminated by using SET and RESET to determine the actual null field output at any temperature
from -40 to 85 C
MEMSIC MMC246xMT Rev D Page 2 of 15 5/30/2013