Datasheet
Magnetic Sensor series
3-Axis Digital Magnetometer IC
BM1422AGMV
General Description
BM1422AGMV is a 3-axis magnetic sensor which
incorporates magneto-impedance (MI) elements to
detect magnetic field and a control IC in a small
package.
Key Specifications
Input Voltage Range (AVDD):
1.7V to 3.6V
Input Voltage Range (DVDD):
1.7V to 3.6V
Operating Current (100SPS):
0.15mA(Typ)
Magnetic Measurable Range:
±1200μT(Typ)
Magnetic Sensitivity:
0.042μT/LSB(Typ)
Maximum Exposed Field:
1000mT
Operating Temperature Range:
-40°C to +85°C
W(Typ) x D(Typ) x H(Max)
2.00mm x 2.00mm x 1.00mm
Features
3-axis Magnetic Sensor using MI Elements
2
I C Interface
12bit / 14bit Digital Output
Package
MLGA010V020A
Applications
Wristwatch
Mobile phone, Smartphone
Typical Application Circuit
BM1422AGMV
AVDD
MI Sensor
X axis
MI Sensor
Y axis
MI Sensor
Z axis
Regulator
(Internal)
VREG
GND
ADDR
AD Converter
Logic
Serial
I/F
DVDD
SCL
SDA
DRDY
TEST1
TEST2
OPEN
OPEN
Host
〇Product
structure : Silicon monolithic integrated circuit
.
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〇This
product has no designed protection against radioactive rays
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BM1422AGMV
Contents
General Description ........................................................................................................................................................................ 1
Features.......................................................................................................................................................................................... 1
Applications .................................................................................................................................................................................... 1
Key Specifications........................................................................................................................................................................... 1
Package .......................................................................................................................................................................................... 1
Typical Application Circuit ............................................................................................................................................................... 1
Pin Configuration ............................................................................................................................................................................ 3
Pin Description................................................................................................................................................................................ 3
Block Diagram ................................................................................................................................................................................ 4
Absolute Maximum Ratings ............................................................................................................................................................ 5
Thermal Resistance ........................................................................................................................................................................ 5
Recommended Operating Conditions ............................................................................................................................................. 5
Electrical Characteristics................................................................................................................................................................. 6
Typical Performance Curves ........................................................................................................................................................... 7
Figure 1. AVDD PowerDown Current .......................................................................................................................................... 7
Figure 2. AVDD PowerDown Current .......................................................................................................................................... 7
Figure 3. DVDD PowerDown Current .......................................................................................................................................... 7
Figure 4. DVDD PowerDown Current .......................................................................................................................................... 7
Figure 5. Average Current during Measurement ......................................................................................................................... 8
Figure 6. Measurement Time ...................................................................................................................................................... 8
Figure 7. Output Characteristic ................................................................................................................................................... 8
I C bus Timing Characteristics ........................................................................................................................................................ 9
I C bus Communication .................................................................................................................................................................. 9
I C bus Slave address .................................................................................................................................................................. 10
Register Map ................................................................................................................................................................................ 10
Control Sequence ......................................................................................................................................................................... 15
Application Example ..................................................................................................................................................................... 19
I/O equivalent circuit ..................................................................................................................................................................... 20
Operational Notes ......................................................................................................................................................................... 21
Ordering Information ..................................................................................................................................................................... 23
Marking Diagrams ......................................................................................................................................................................... 23
Physical Dimension, Tape and Reel Information ........................................................................................................................... 24
Revision History ............................................................................................................................................................................ 25
2
2
2
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BM1422AGMV
Pin Configuration
1PIN Mark
Bottom View
Top View
1
10
2
3
4
X-axis
Z-axis
9
8
7
6
5
Above arrows indicate North-pole as “+”.
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
AVDD
GND
VREG
TEST1
SDA
TEST2
SCL
DRDY
ADDR
DVDD
Ground
Internal regulator output
Test pin
2
(Note 3)
(Note 2)
Function
Analog circuit power supply
(Note 1)
I C signal data I/O
Test pin
2
(Note 3)
I C signal clock input
Data ready output pin
I C programmable address bit
Digital circuit power supply
2
(Note 4)
(Note 5)
(Note 1) Please place a bypass capacitor between AVDD and GND in the proximity of the terminals.
(Note 2) Please place a bypass capacitor between VREG and GND in the proximity of the terminals.
Please set a bypass capacitor of 1.0uF between VREG and GND
(Note 3) Use as Non-Connection (NC).
(Note 4) Please connect to DVDD or GND.
(Note 5) Please place a bypass capacitor between DVDD and GND in the proximity of the terminals.
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Y-axis
BM1422AGMV
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Supply Voltage (AVDD)
Supply Voltage (DVDD)
Input Voltage
Operating Temperature Range
Storage Temperature Range
Maximum Exposed Field
Symbol
Vdd_a
Vdd_d
Vin
Topr
Tstg
Mef
Rating
4.5
4.5
-0.3 to +(Vdd_d+0.3)
-40 to +85
-40 to +125
-1000 to +1000
Unit
V
V
V
°C
°C
mT
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Thermal Resistance
(Note 1)
Parameter
MLGA010V020A
Junction to Ambient
Junction to Top Characterization Parameter
(Note 2)
Symbol
Thermal Resistance (Typ)
1s
(Note 3)
2s2p
(Note 4)
Unit
θ
JA
Ψ
JT
317.3
60
191.5
41
°C/W
°C/W
(Note 1)Based on JESD51-2A(Still-Air)
(Note 2)The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside
surface of the component package.
(Note 3)Using a PCB board based on JESD51-3.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.57mmt
Thickness
70μm
(Note 4)Using a PCB board based on JESD51-7.
Material
FR-4
Board Size
114.3mm x 76.2mm x 1.6mmt
2 Internal Layers
Bottom
Copper Pattern
74.2mm x 74.2mm
Thickness
70μm
35μm
Thickness
70μm
Copper Pattern
74.2mm x 74.2mm
Thickness
Recommended Operating Conditions (Ta= -40°C to +85°C)
Parameter
Supply Voltage (AVDD)
Supply Voltage (DVDD)
I C Clock Frequency
2
Symbol
Vdd_a
Vdd_d
fSCL
Rating
+1.7 to +3.6
+1.7 to +3.6
MAX 400
Unit
V
V
kHz
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