MMC34166PJ [MEMSIC]
±16 Gauss, Ultra Small, Low Noise 3-axis Magnetic Sensor;
| 型号： | MMC34166PJ |
| 厂家： | 
Memsic |
| 描述： | ±16 Gauss, Ultra Small, Low Noise 3-axis Magnetic Sensor |
| 文件： | 总14页 (文件大小：388K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
±16 Gauss, Ultra Small, Low
Noise 3-axis Magnetic Sensor
MMC3416xPJ
FEATURES
• Fully integrated 3-axis magnetic sensor and
electronic circuits requiring fewer external
components
• Superior Dynamic Range and Accuracy:
9
9
±16 G FSR with 16/14 bits operation
0.5 mG/2 mG per LSB resolution in 16/14
bits operation mode
9
9
1.5 mG total RMS noise
Enables heading accuracy of ±1º
• Max output data rate of 800 Hz (12 bits mode)
• Ultra Small Low profile package
1.6x1.6x0.6 mm
FUNCTIONAL BLOCK DIAGRAM
• SET/RESET function
noise level, enabling heading accuracy of 1º in
electronic compass applications. Contact Memsic for
access to advanced calibration and tilt-compensation
algorithms.
9
Allows for elimination of temperature
variation induced offset error (Null field
output)
9
Clears the sensors of residual
magnetization resulting from strong
external fields
An integrated SET/RESET function provides for the
elimination of error due to Null Field output change
with temperature. In addition it clears the sensors of
any residual magnetic polarization resulting from
exposure to strong external magnets. The
SET/RESET function can be performed for each
measurement or periodically as the specific
application requires.
• On-chip sensitivity compensation
• Low power consumption (140 µA @ 7 Hz )
• 1 µA (max) power down function
• I2C Slave, FAST (≤400 KHz) mode
• 1.62 V~3.6 V wide power supply operation
supported, 1.8 V I/O compatibility.
• RoHS compliant
The MMC3416xPJ is packaged in an ultra small low
profile BGA package (1.6 x 1.6 x 0.65 mm,) and with
an operating temperature range from -40 °C to +85
°C.
APPLICATIONS
Electronic Compass & GPS Navigation
Position Sensing
The MMC3416xPJ provides an I2C digital output with
400 KHz, fast mode operation.
DESCRIPTION
The MMC3416xPJ is a complete 3-axis magnetic
sensor with on-chip signal processing and integrated
I2C 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 ±16
Gauss (G), with 0.5 mG/2 mG per LSB resolution for
16/14 bits operation mode and 1.5 mG total RMS
©MEMSIC, Inc.
One Technology Drive, Suite 325, Andover, MA01810, USA
Tel: +1 978 738 0900
Information furnished by MEMSIC is believed to be accurate and reliable.
However, no responsibility is assumed by MEMSIC for its use, or for any
infringements of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or
patent rights of MEMSIC.
Fax: +1 978 738 0196
www.memsic.com
MEMSIC MMC3416xPJ Rev.C
Page 1 of 14
10/18/2013
SPECIFICATIONS (Measurements @ 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
VDA
G
V
±16
1.8
1.8
1.621
1.621
3.6
3.6
5.0
Supply Voltage
VDD (I2C interface)
V
Supply Voltage Rise Time
mS
µA
µA
µA
µA
µA
°C
°C
BW[1:0]=00, 16 bits mode
BW[1:0]=01, 16 bits mode
BW[1:0]=10, 14 bits mode
BW[1:0]=11, 12 bits mode
140
70
Supply Current2
(7measurements/second)
35
18
Power Down Current
Operating Temperature
Storage Temperature
1.0
85
-40
-55
125
Linearity Error
(Best fit straight line)
FS=±16 G
Happlied=±10 G
0.25
%FS
Hysteresis
3 sweeps across ±16 G
3 sweeps across ±16 G
0.1
0.1
%FS
Repeatability Error
Alignment Error
Transverse Sensitivity
%FS
degrees
%
mG
mG
±1.0
±2.0
1.5
2.0
4.0
±3.0
±5.0
BW[1:0]=00, 16 bits mode
BW[1:0]=01, 16 bits mode
BW[1:0]=10, 14 bits mode
BW[1:0]=11, 12 bits mode
Total RMS Noise
mG
mG
6.0
Output resolution
16/14/12
125
bits
Hz
Hz
Hz
BW[1:0]=00, 16 bits mode
BW[1:0]=01, 16 bits mode
BW[1:0]=10, 14 bits mode
BW[1:0]=11, 12 bits mode
250
450
800
Max Output data rate
Hz
Heading accuracy3
Sensitivity
degrees
%
counts/G
counts/G
counts/G
±1.0
-10
+10
±16 G
16 bits mode
14 bits mode
12 bits mode
-40~85°C
2048
512
128
Sensitivity Change Over
Temperature
%
Delta from 25°C
±3
±16 G
-0.2
+0.2
G
16 bits mode
14 bits mode
12 bits mode
32768
8192
2048
counts
counts
counts
Null Field Output
Null Field Output Change Over
Temperature using SET/RESET
Disturbing Field4
-40~85 °C
Delta from 25 °C
mG
±5
25
G
G
Maximum Exposed Field
SET/RESET Repeatability5
10000
3
mG
1
2
1.62 V is the minimum operation voltage, or VDA / VDD should not be lower than 1.62 V.
Supply current is proportional to how many measurements performed per second, for example, at one measurement per second, the power consumption will be 140
uA/7=20 µA.
3
4
is
MEMSIC product enables users to utilize heading accuracy to be 1.0 degree typical when using MEMSIC’s proprietary software or algorithm
This is the magnitude of external field that can be tolerated without changing the sensor characteristics. If the disturbing field is exceeded, a SET/RESET operation
required to restore proper sensor operation.
5
Perform SET/RESET alternately. SET repeatability is defined as the difference in measurement between multiple SET events. RESET repeatability is defined
similarly.
MEMSIC MMC3416xPJ Rev C
Page 2 of 14
10/18/2013
I2C INTERFACE I/O CHARACTERISTICS (VDD=1.8 V)
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Logic Input Low Level
Logic Input High Level
Hysteresis of Schmitt input
Logic Output Low Level
Input Leakage Current
SCL Clock Frequency
VIL
VIH
Vhys
VOL
Ii
-0.5
0.7*VDD
0.2
0.3* VDD
VDD
V
V
V
0.4
10
V
0.1VDD<Vin<0.9VDD
-10
0
µA
kHz
fSCL
400
START Hold Time
START Setup Time
LOW period of SCL
HIGH period of SCL
Data Hold Time
Data Setup Time
Rise Time
tHD;STA
tSU;STA
tLOW
tHIGH
tHD;DAT
tSU;DAT
tr
0.6
0.6
1.3
0.6
0
µS
µS
µS
µS
µS
µS
µS
µS
µS
0.9
0.1
From VIL to VIH
From VIH to VIL
0.3
0.3
Fall Time
tf
Bus Free Time Between STOP and
START
STOP Setup Time
tBUF
1.3
0.6
tSU;STO
µS
SDA
tSP
tf
tf
tSU;DAT
tLOW
tHD;STA
tr
t
tr
BUF
SCL
tSU;STA
tSU;STO
tHD;STA
tHIGH
Sr
P
S
tHD;DAT
S
Timing Definition
MEMSIC MMC3416xPJ Rev C
Page 3 of 14
10/18/2013
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VDD) ………………...-0.5 to +3.6 V
Storage Temperature ……….……-55 °C to +125 °C
Maximum Exposed Field ………………..10000 G
*Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. This is a stress rating only; the
functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended
periods may affect the device’s reliability.
Pin Description: BGA Package
Pin
Name
TEST
NC
Description
Factory Use Only, Leave
Open/Not connected
Not Connected
I/O
NC
NC
I
1
2
3
4
5
Serial Clock Line for I2C
bus
SCL
SDA
Vpp
Serial Data Line for I2C bus
Factory Use Only, Leave
Open
I/O
NC
Number
Part number
MMC34160PJ
MMC34161PJ
MMC34162PJ
MMC34163PJ
MMC34164PJ
MMC34165PJ
MMC34166PJ
MMC34167PJ
0
1
2
3
4
5
6
7
6
7
VDD
NC
Power Supply for I2C bus
Not Connected
P
NC
Connect to External
Capacitor
Not Connected
Not Connected
Connect to Ground
Power Supply
8
CAP
I
9
NC
NC
VSA
VDA
NC
NC
P
10
11
12
“Number” represents the character of the 1st line in the
marking, the black dot indicates pin one (1).The 2nd line
represents Lot Number.
P
All parts are shipped in tape and reel packaging with
9000pcs per 13” reel or 3000pcs per 7” reel.
THEORY OF OPERATION
Caution: ESD (electrostatic discharge) sensitive
device.
The Anisotropic Magneto-Resistive (AMR) sensors
are special resistors made of permalloy thin film
deposited on a silicon wafer. During manufacturing, a
strong magnetic field is applied to the film to orient its
magnetic domains in the same direction, establishing
a magnetization vector. Subsequently, an external
magnetic field applied perpendicularly to the sides of
the film causes the magnetization to rotate and
change angle. This effect causes the film’s resistance
to vary with the intensity of the applied magnetic field.
The MEMSIC AMR sensor is incorporated into a
Wheatstone bridge configuration to maximize Signal
to Noise ratio. A change in magnetic field produces a
proportional change in differential voltage across the
Wheatstone bridge
Ordering Guide:
MMC3416xPJ
Package type:
Code
J
Type
BGA12
RoHS compliant
Performance Grade:
Code
P
Performance Grade
Temp compensated
Address code: 0~7
Code
7 bit I2C Address
However, the influence of a strong magnetic field
(more than 25 G) in any direction could upset, or flip,
the polarity of the film, thus changing the sensor
characteristics. A strong restoring magnetic field must
be applied momentarily to restore, or set, the sensor
characteristics. The MEMSIC magnetic sensor has an
on-chip magnetically coupled strap: a SET/RESET
strap pulsed with a high current, to provide the
restoring magnetic field.
0
1
2
3
4
5
6
7
0110000b
0110001b
0110010b
0110011b
0110100b
0110101b
0110110b
0110111b
Marking illustration:
MEMSIC MMC3416xPJ Rev C
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10/18/2013
PIN DESCRIPTIONS
9
Do not place the device opposite magnetized
material or material that may become magnetized
located on the other side of the PCB.
VDA – This is the supply input for the circuits and the
magnetic sensor. The DC voltage should be between
1.62 and 3.6 volts. A 1uF by-pass capacitor is strongly
recommended.
Please refer to MEMSIC application note: AN-200-20-
0018 (MEMSIC Magnetic Sensor Hardware Design
Layout Guideline for Electronic Device).
VSA – This is the ground pin for the magnetic sensor.
SDA – This pin is the I2C serial data line, and
operates in FAST (400 KHz) mode.
POWER CONSUMPTION
The power consumed by the device is proportional to
the number of measurements taken per second. For
example, when BW<1:0>=00, that is, 16-bit mode with
7.92 mS per measurement, MMC3416xPJ consumes
140 µA (typical) at 1.8 V with 7 measurements per
second. If only 2 measurements are performed per
second, the current will be 140*2/7=40 µA.
SCL– This pin is the I2C serial clock line, and operates
in FAST (400 KHz) mode.
V
DD – This is the power supply input for the I2C bus,
and is 1.8 V compatible (1.62 V to 3.6 V). VDD is
independent of VDA.
TEST – Factory use only, Leave Open/Not connected
I2C INTERFACE DESCRIPTION
A slave mode I2C circuit has been implemented into
the MEMSIC magnetic sensor as a standard interface
for customer applications. The A/D converter and
MCU functionality have been added to the MEMSIC
sensor, thereby increasing ease-of-use, and lowering
power consumption, footprint and total solution cost.
CAP –Connect a 4.7 µF low ESR (typically smaller
than 0.2 ohm) ceramic capacitor.
Vpp – Factory use only, Leave Open
EXTERNAL CIRCUITRY CONNECTION
The I2C (or Inter IC bus) is an industry standard bi-
directional two-wire interface bus. A master I2C
device can operate READ/WRITE controls to an
unlimited number of devices by device addressing.
The MEMSIC magnetic sensor operates only in a
slave mode, i.e. only responding to calls by a master
device.
I2C BUS CHARACTERISTICS
VDD
Rp
Rp
SDA (Serial Data Line)
SCL (Serial Clock Line)
(Top View)
HARDWARE DESIGN CONSIDERATION
9
Provide adequate separation distance to devices
that contain permanent magnets or generate
magnetic fields (IE speakers, coils, inductors...)
The combined magnetic field to be measured and
interference magnetic field should be less than the
full scale range of the MMC3416xPJ (±16 G).
DEVICE 2
DEVICE 1
I2C Bus
The two wires in the I2C bus are called SDA (serial
data line) and SCL (serial clock line). In order for a
data transfer to start, the bus has to be free, which is
defined by both wires in a HIGH output state. Due to
the open-drain/pull-up resistor structure and wired
Boolean “AND” operation, any device on the bus can
pull lines low and overwrite a HIGH signal. The data
9
9
Provide adequate separation distance to current
carrying traces. Do not route current carrying
traces under the sensor or on the other side of the
PCB opposite the device.
Do not cover the sensor with magnetized material
or material that may become magnetized, (IE,
shield box, LCD, battery, iron bearing material…).
MEMSIC MMC3416xPJ Rev C
Page 5 of 14
10/18/2013
on the SDA line has to be stable during the HIGH
period of the SCL line. In other words, valid data can
only change when the SCL line is LOW.
Note: Rp selection guide: 4.7 Kohm for a short I2C
bus length (less than 10 cm), and 10Kohm for a bus
length less than 5 cm.
REGISTER MAP
Register Name
Xout Low
Xout High
Yout Low
Yout High
Zout Low
Zout High
Status
Internal control 0
Internal control 1
R0
R1
R2
Address
00H
01H
02H
03H
04H
05H
06H
07H
08H
1BH
1CH
1DH
1EH
1FH
20H
Description
Xout LSB
Xout MSB
Yout LSB
Yout MSB
Zout LSB
Zout MSB
Device status
Control register 0
Control register 1
Factor used register
Factory used register
Factory used register
Factory used register
Factory used register
Product ID
R3
R4
Product ID 1
Register Details
Xout High, Xout Low
Xout Low
7
6
5
5
4
3
2
1
0
0
Addr: 00H
Mode
Xout[7:0]
R
7
6
4
3
2
1
Xout High
Addr: 01H
Mode
Xout[15:8]
R
X-axis output, unsigned format, the 2 LSB of Xout Low will be fixed as “0” when in 12 bit mode, the 2 LSB of
Xout Low will be fixed as “0” when in 14 bit mode.
Yout High, Yout Low
7
6
5
4
3
2
1
0
0
Yout Low
Addr: 02H
Mode
Yout[7:0]
R
7
6
5
4
3
2
1
Yout High
Addr: 03H
Mode
Yout[15:8]
R
Y-axis output, unsigned format, the 2 LSB of Yout Low will be fixed as “0” when in 12 bit mode, the 2 LSB of
Yout Low will be fixed as “0” when in 14 bit mode.
Zout High, Zout Low
7
6
5
4
3
2
2
1
1
0
0
Zout Low
Addr: 04H
Mode
Zout[7:0]
R
7
6
5
4
3
Zout High
Addr: 05H
Mode
Zout[15:7]
R
Z-axis output, unsigned format, the 2 LSB of Zout Low will be fixed as “0” when in 12 bit mode, the 2 LSB of
Zout Low will be fixed as “0” when in 14 bit mode.
MEMSIC MMC3416xPJ Rev C
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Status
Device Status
7
0
6
0
5
0
4
0
3
2
1
Pump
On
0
Addr: 06H
Reserved
ST_XYZ Rd_Don
_OK
Meas
Done
0
e
Reset Value
Mode
0
0
0
R
Bit Name
Description
Meas Done
Indicates measurement event is completed. This bit should be checked before
reading the output
Pump On
Indicates the charge pump status, after Refill Cap command, the charge pump will
start running, and this bit will stays high, it will be reset low after the cap reaches its
target voltage and the charge pump is shut off.
Rd_Done
ST_XYZ_OK
Indicates the chip was able to successfully read its memory.
Indicate selftest OK once this bit is “1”.
Internal Control 0
7
6
5
4
3
2
1
0
Control
Register 0
Addr: 07H
Refill
Cap
RESET
SET
No
Boost
CM
Freq1
CM
Freq0
Cont
Mode
On
TM
Reset Value
Mode
0
W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
Description
Take measurement, set ‘1’ will initiate measurement.
Bit Name
TM
Cont Mode On When set to a 1 this enables the Continuous Measurement Mode. The chip will
periodically take measurements of the magnetic field; the frequency of these
measurements is determined by bits CM Freq<1:0>.
CM Freq0
CM Freq1
These bits determine how often the chip will take measurements in Continuous
Measurement Mode.
CM Freq1
CM Freq0
Frequency
1.5 Hz
13 Hz
0
0
1
1
0
1
0
1
25 Hz
50 Hz
No Boost
Setting this bit high will disable the charge pump and cause the storage capacitor to
be charged off VDD.
SET
RESET
Writing “1” will set the sensor by passing a large current through Set/Reset Coil
Writing “1” will reset the sensor by passing a large current through Set/Reset Coil in
a reversed direction
Refill Cap
Writing “1” will recharge the capacitor at CAP pin, it is requested to be issued
before SET/RESET command.
MEMSIC MMC3416xPJ Rev C
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10/18/2013
Internal Control 1
7
6
5
4
3
2
1
0
Control
Register 1
Addr: 08H
SW_
RST
0
Temp_
ST_XYZ Z-inhibit Y-inhibit X-inhibit
BW1
BW0
tst
0
W
Reset Value
Mode
0
0
0
0
0
W
0
W
W
W
W
W
W
Description
Bit Name
BW0
Output resolution
BW1
BW1
BW0
Output Resolution
16 bits
16 bits
14 bits
12 bits
Measurement Time
7.92 mS
4.08 mS
2.16 mS
1.20 mS
0
0
1
1
0
1
0
1
Note: X/Y/Z channel measurements are taken sequentially. Delay Time among
those measurements is 1/3 of the Measurement Time defined in the table.
Factory-use Register
X-inhibit
Y-inhibit
Z-inhibit
ST_XYZ
Selftest check, write “1” to this bit and execute a TM command, after TM is
completed the result can be read as bit ST_XYZ_OK.
Factory-use Register
Writing “1”will cause the part to reset, similar to power-up. It will clear all registers
and also re-read OTP as part of its startup routine.
Temp_tst
SW_RST
Product ID 1
7
6
5
4
3
2
1
0
Product ID 1
Addr: 20H
Reset Value
Mode
Product ID1[7:0]
0
R
0
R
0
R
0
R
0
R
1
R
1
R
0
R
conflict, either by ICs from other manufacturers or by
other MEMSIC devices on the same bus
DATA TRANSFER
The initial addressing of the slave is always followed
by the master writing the number of the slave register
to be read or written, so this initial addressing always
indicates a WRITE operation by sending [0110xxx1].
After being addressed, the MEMSIC device being
called should respond by an “Acknowledge” signal by
pulling SDA line LOW. Subsequent communication
bytes can either be:
A data transfer is started with a “START” condition
and ended with a “STOP” condition. A “START”
condition is defined by a HIGH to LOW transition on
the SDA line while SCL line is HIGH. A “STOP”
condition is defined by a LOW to HIGH transition on
the SDA line while the SCL line is held HIGH. All data
transfer in I2C system are 8-bits long. Each byte has
to be followed by an acknowledge bit. Each data
transfer involves a total of 9 clock cycles. Data is
transferred starting with the most significant bit (MSB).
a) the data to be written to the device register, or
b) Another START condition followed by the
device address indicating a READ operation
[0110xxx0], and then the master reads the
register data.
After a START condition, the master device calls a
specific slave device by sending its 7-bit address with
the 8th bit (LSB) indicating that either a READ or
WRITE operation will follow, [1] for READ and [0] for
WRITE. The MEMSIC device 7-bit device address is
[x110xxx] where the three LSB’s are pre-
programmed into the MMC3416xPJ by the factory and
they are indicated on the package as shown in the
previous section “Package Marking Illustration”.
Multiple data bytes can be written or read to
numerically sequential registers without the need of
another START condition. Data transfer is terminated
by a STOP condition or another START condition.
Two detailed examples of communicating with the
MEMSIC device are listed below for the actions of
acquiring a magnetic field measurement and
magnetizing the sensor.
A total of 8 different addresses can be pre-
programmed into MEMSIC device by the factory. This
variation of I2C address avoids a potential address
MEMSIC MMC3416xPJ Rev C
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POWER STATE
MEMSIC MR Sensor will enter power down mode
automatically after data acquisition is finished.
VDA
VDD
Power State
OFF(0 V)
OFF(0V)
OFF(0 V), no power
consumption
OFF(0 V)
1.62~3.6 V
OFF(0 V), power
consumption is less than
1 uA.
1.62~3.6 V OFF(0 V)
1.62~3.6 V 1.62~3.6 V
Power consumption is not
predictable, not
recommended state.
Normal operation mode,
device will enter into
power down mode
automatically after data
acquisition is finished
EXAMPLE MEASUREMENT
First cycle: A START condition is established by the
Master Device followed by a call to the slave address
[0110xxx] with the eighth bit held low to indicate a
WRITE request. Note: [xxx] is determined by factory
programming and a total of 8 different addresses are
available.
Second cycle: After an acknowledge signal is received
by the master device (MEMSIC device pulls SDA line
low during 9th SCL pulse), the master device sends
the address of Control Register 0 or [00000111] as
the target register to be written. The MEMSIC device
should acknowledge receipt of the address (9th SCL
pulse, SCL pulled low).
Third cycle: The Master device writes to the Internal
Control Register 0 the code [00000001] (TM high) to
initiate data acquisition. The MEMSIC device should
send an Acknowledge and internally initiate a
measurement (collect x, y and z data). A STOP
condition indicates the end of the write operation.
Fourth cycle: The Master device sends a START
command followed by the MEMSIC device’s seven bit
address, and finally the eighth bit set low to indicate a
WRITE. An Acknowledge should be send by the
MEMSIC device in response.
Fifth cycle: The Master device sends the MEMSIC
device’s Status Register [00000110] as the address to
read.
Sixth cycle: The Master device sends a START
command followed by the MEMSIC device’s seven bit
address, and finally the eighth bit set high to indicate a
READ. An Acknowledge should be send by the
MEMSIC device in response.
Seventh cycle: The Master device cycles the SCL line.
This causes the Status Register data to appear on
MEMSIC MMC3416xPJ Rev C
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SDA line. Continuously read the Status Register until
the Meas Done bit (bit 0) is set to ‘1’. This indicates
that data for the x, y, and z sensors is available to be
read.
Fourth cycle: The Master device writes to the
MEMSIC device’s Internal Control 0 register the code
[00100000] (SET bit) to initiate a SET action. The
MEMSIC device should send an Acknowledge.
Eighth cycle: The Master device sends a START
command followed by the MEMSIC device’s seven bit
address, and finally the eighth bit set low to indicate a
WRITE. An Acknowledge should be send by the
MEMSIC device in response.
EXAMPLE OF RESET*
First cycle: A START condition is established by the
Master Device followed by a call to the slave address
[0110xxx] with the eighth bit held low to indicate a
WRITE request. Note: [xxx] is determined by factory
programming and a total of 8 different addresses are
available.
Ninth cycle: The Master device sends a [00000000]
(Xout LSB register address) as the register address to
read.
Second cycle: After an acknowledge signal is received
by the master device (The MEMSIC device pulls the
SDA line low during the 9th SCL pulse), the master
device sends [00000111] as the target address
(Internal Control Register 0). The MEMSIC device
should acknowledge receipt of the address (9th SCL
pulse).
Tenth cycle: The Master device calls the MEMSIC
device’s address with a READ (8th SCL cycle SDA line
high). An Acknowledge should be send by the
MEMSIC device in response.
Eleventh cycle: Master device continues to cycle the
SCL line, and each consecutive byte of data from the
X, Y and Z registers should appear on the SDA line.
The internal memory address pointer automatically
moves to the next byte. The Master device
acknowledges each. Thus:
Third cycle: The Master device writes to the MEMSIC
device’s Internal Control Register 0 the code
[10000000] (Refill Cap) to prepare for RESET action.
A minimum of 50ms wait should be provided to allow
the MEMSIC device to finish its preparation for the
RESET action.
Eleventh cycle: LSB of X channel.
Twelfth cycle: MSB of X channel.
Thirteenth cycle: LSB of Y channel.
Fourteenth cycle: MSB of Y channel.
Fifteenth cycle: LSB of Z channel.
Sixteenth cycle: MSB of Z channel.
Fourth cycle: The Master device writes to the
MEMSIC device’s Internal Control 0 register the code
[01000000] (RESET bit) to initiate a RESET action.
The MEMSIC device should send an Acknowledge.
At this point, the MEMSIC AMR sensors have been
conditioned for optimum performance and data
measurements can commence.
Master ends communications by NOT sending an
‘Acknowledge’ and also follows with a ‘STOP’
command.
Note *: The RESET action can be skipped for most
applications
EXAMPLE OF SET
First cycle: A START condition is established by the
Master Device followed by a call to the slave address
[0110xxx] with the eighth bit held low to indicate a
WRITE request. Note: [xxx] is determined by factory
programming and a total of 8 different addresses are
available.
Second cycle: After an acknowledge signal is received
by the master device (The MEMSIC device pulls the
SDA line low during the 9th SCL pulse), the master
device sends [00000111] as the target address
(Internal Control Register 0). The MEMSIC device
should acknowledge receipt of the address (9th SCL
pulse).
Third cycle: The Master device writes to the MEMSIC
device’s Internal Control Register 0 the code
[10000000] (Refill Cap) to prepare for SET action.*
A minimum of 50ms wait should be provided to allow
the MEMSIC device to finish its preparation for the
SET action.
MEMSIC MMC3416xPJ Rev C
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3) Perform RESET. This resets the internal
magnetization of the sensing resistors in the
direction of the RESET field, which is opposite to
the SET field (180o opposed).
USING SET AND RESET TO REMOVE BRIDGE
OFFSET
The integrated SET and RESET functions of the
MMC3416xPJ enables the user to remove the error
associated with bridge Offset change as a function of
temperature, thereby enabling more precise heading
measurements over a wider temperature than
competitive technologies. The SET and RESET
functions effectively alternately flip the magnetic
sensing polarity of the sensing elements of the device.
4) Perform MEASUREMENT. This measurement
will contain both the sensors response to the
external field and also the Offset. In other words,
Output2 = -H + Offset.
5) Finally, calculate H by subtracting the two
measurements and dividing by 2. This procedure
effectively eliminates the Offset from the
measurement and therefore any changes in the
Offset over temperature.
1)
The most accurate magnetic field measurements
can be obtained by using the protocol described
as follows: Perform SET. This sets the internal
magnetization of the sensing resistors in the
direction of the SET field.
Note: To calculate and store the offset; add the two
measurements and divide by 2. This calculated offset
value can be subtracted from subsequent
measurements to obtain H directly from each
measurement.
2) Perform MEASUREMENT. This measurement
will contain not only the sensors response to the
external magnetic field, H, but also the Offset; in
other words,
Output1 = +H + Offset.
OPERATING TIMING
VDD
I2C
S
T
R
T
R
T
R
S
T
R
top
tRF
tSR
tTM
tSR
tTM
tTM
tTM
SET/RESET
S
Take Measurement
Read data
R
Repeat T & R
Wait the device to be ready for next operation
MEMSIC MMC3416xPJ Rev C
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Operating Timing Diagram
Parameter
Symbol
top
Min.
Typ.
Max.
Unit
mS
mS
mS
mS
mS
mS
mS
Time to operate device after VDD valid
Time from Refill Cap to SET/RESET
Wait time to complete SET/RESET
10
50
1
tRF
tSR
tTM BW=00
tTM BW=01
tTM BW=10
tTM BW=11
10
5
Wait time to complete measurement
3
1.5
MEMSIC MMC3416xPJ Rev C
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10/18/2013
STORAGE CONDITIONS
Temperature: <30 ºC
Humidity:
Period:
<60%RH
1 year (after delivery)
Moisture Sensitivity Level: 3
Bake Prior to Reflow: storage period more than 1 year, or humidity indicator card reads >60% at 23±5 ºC
Bake Procedure:
Bake to Soldering:
refer to J-STD-033
<1 week under 30 ºC, 60%RH condition
SOLDERING RECOMMENDATIONS
MEMSIC magnetic sensor is capable of withstanding an MSL3 / 260℃ solder reflow. Following is the reflow profile:
Note:
• Reflow is limited by 2 times
• The second reflow cycle should be applied after device has cooled down to 25 ºC (room temperature)
• This is the reflow profile for Pb free process
• The peak temperature on the sensor surface should be limited under 260 ºC for 10 seconds.
• Solder paste’s reflow recommendation should be followed to get the best SMT quality.
If the part is mounted manually, please ensure the temperature could not exceed 260 ºC for 10 seconds.
MEMSIC MMC3416xPJ Rev C
Page 13 of 14
10/18/2013
PACKAGE DRAWING (BGA package)
LAND PATTERN
2
MEMSIC MMC3416xPJ Rev C
Page 14 of 14
10/18/2013
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