AK8963

AK8963
[AK8963]
AK8963
3-axis Electronic Compass
1. Features
A 3-axis electronic compass IC with high sensitive Hall sensor technology.
Best adapted to pedestrian city navigation use for cell phone and other portable appliance.
Functions:
• 3-axis magnetometer device suitable for compass application
• Built-in A to D Converter for magnetometer data out
• 14-/16-bit selectable data out for each 3 axis magnetic components
- Sensitivity: 0.6 µT/LSB typ. (14-bit)
0.15µT/LSB typ. (16-bit)
• Serial interface
- I2C bus interface.
Standard mode and Fast mode compliant with Philips I2C specification Ver.2.1
- 4-wire SPI
• Operation modes:
Power-down, Single measurement, Continuous measurement, External trigger measurement, Self
test and Fuse ROM access.
• DRDY function for measurement data ready
• Magnetic sensor overflow monitor function
• Built-in oscillator for internal clock source
• Power on Reset circuit
• Self test function with built-in internal magnetic source
Operating temperatures:
•
-30°C to +85°C
Operating supply voltage:
• Analog power supply
+2.4V to +3.6V
• Digital Interface supply
+1.65V to analog power supply voltage.
Current consumption:
• Power-down:
3 µA typ.
• Measurement:
- Average power consumption at 8 Hz repetition rate: 280µA typ.
Package:
AK8963C 14-pin WL-CSP (BGA):
AK8963N 16-pin QFN package:
MS1356-E-02
1.6 mm × 1.6 mm × 0.5 mm (typ.)
3.0 mm × 3.0 mm × 0.75 mm (typ.)
-1-
2013/10
[AK8963]
2. Overview
AK8963 is 3-axis electronic compass IC with high sensitive Hall sensor technology.
Small package of AK8963 incorporates magnetic sensors for detecting terrestrial magnetism in the X-axis,
Y-axis, and Z-axis, a sensor driving circuit, signal amplifier chain, and an arithmetic circuit for processing the
signal from each sensor. Self test function is also incorporated. From its compact foot print and thin package
feature, it is suitable for map heading up purpose in GPS-equipped cell phone to realize pedestrian navigation
function.
AK8963 has the following features:
(1) Silicon monolithic Hall-effect magnetic sensor with magnetic concentrator realizes 3-axis magnetometer
on a silicon chip. Analog circuit, digital logic, power block and interface block are also integrated on a
chip.
(2) Wide dynamic measurement range and high resolution with lower current consumption.
Output data resolution:
14-bit (0.6 µT/LSB)
16-bit (0.15 µT/LSB)
Measurement range:
± 4900 µT
Average current at 8Hz repetition rate:
280µA typ.
(3) Digital serial interface
- I2C bus interface to control AK8963 functions and to read out the measured data by external CPU. A
dedicated power supply for I2C bus interface can work in low-voltage apply as low as 1.65V.
- 4-wire SPI is also supported. A dedicated power supply for SPI can work in low-voltage apply as low as
1.65V.
(4) DRDY pin and register inform to system that measurement is end and set of data in registers are ready to
be read.
(5) Device is worked by on-chip oscillator so no external clock source is necessary.
(6) Self test function with internal magnetic source to confirm magnetic sensor operation on end products.
MS1356-E-02
-2-
2013/10
[AK8963]
3. Table of Contents
1.
2.
3.
4.
Features ...................................................................................................................................... 1
Overview ..................................................................................................................................... 2
Table of Contents ........................................................................................................................ 3
Circuit Configuration.................................................................................................................... 5
4.1. Block Diagram...................................................................................................................... 5
4.2. Block Function ..................................................................................................................... 5
4.3. Pin Function ......................................................................................................................... 6
5. Overall Characteristics ................................................................................................................ 7
5.1. Absolute Maximum Ratings ................................................................................................. 7
5.2. Recommended Operating Conditions ................................................................................. 7
5.3. Electrical Characteristics ..................................................................................................... 7
5.3.1. DC Characteristics........................................................................................................ 7
5.3.2. AC Characteristics ........................................................................................................ 8
5.3.3. Analog Circuit Characteristics ...................................................................................... 9
5.3.4. 4-wire SPI ................................................................................................................... 10
5.3.5. I2C Bus Interface..........................................................................................................11
6. Functional Explanation .............................................................................................................. 12
6.1. Power States ...................................................................................................................... 12
6.2. Reset Functions ................................................................................................................. 12
6.3. Operation Modes ............................................................................................................... 13
6.4. Description of Each Operation Mode................................................................................. 14
6.4.1. Power-down Mode...................................................................................................... 14
6.4.2. Single Measurement Mode ........................................................................................ 14
6.4.3. Continuous Measurement Mode 1 and 2 ................................................................... 15
6.4.3.1.
Data Ready.......................................................................................................... 15
6.4.3.2.
Normal Read Sequence ...................................................................................... 15
6.4.3.3.
Data Read Start During Measurement ................................................................ 16
6.4.3.4.
Data Skip ............................................................................................................. 17
6.4.3.5.
End Operation ..................................................................................................... 17
6.4.3.6.
Magnetic Sensor Overflow .................................................................................. 18
6.4.4. External Trigger Measurement Mode ......................................................................... 18
6.4.5. Self-test Mode............................................................................................................. 19
6.4.6. Fuse ROM Access Mode ............................................................................................ 19
7. Serial Interface .......................................................................................................................... 20
7.1. 4-wire SPI .......................................................................................................................... 20
7.1.1. Writing Data ................................................................................................................ 20
7.1.2. Reading Data .............................................................................................................. 21
7.2. I2C Bus Interface ................................................................................................................ 22
7.2.1. Data Transfer .............................................................................................................. 22
7.2.1.1.
Change of Data ................................................................................................... 22
7.2.1.2.
Start/Stop Condition............................................................................................. 22
7.2.1.3.
Acknowledge ....................................................................................................... 23
7.2.1.4.
Slave Address ..................................................................................................... 23
7.2.2. WRITE Instruction ...................................................................................................... 24
7.2.3. READ Instruction ........................................................................................................ 25
7.2.3.1.
One Byte READ .................................................................................................. 25
7.2.3.2.
Multiple Byte READ ............................................................................................. 25
8. Registers ................................................................................................................................... 26
8.1. Description of Registers..................................................................................................... 26
8.2. Register Map...................................................................................................................... 27
8.3. Detailed Description of Registers ...................................................................................... 28
8.3.1. WIA: Device ID ........................................................................................................... 28
8.3.2. INFO: Information ....................................................................................................... 28
8.3.3. ST1: Status 1 .............................................................................................................. 28
8.3.4. HXL to HZH: Measurement Data................................................................................ 29
8.3.5. ST2: Status 2 .............................................................................................................. 30
8.3.6. CNTL1: Control1 ......................................................................................................... 30
MS1356-E-02
-3-
2013/10
[AK8963]
8.3.7. CNTL2: Control2 ......................................................................................................... 31
8.3.8. ASTC: Self Test Control.............................................................................................. 31
8.3.9. TS1, TS2: Test 1, 2 ..................................................................................................... 31
8.3.10. I2CDIS: I2C Disable .................................................................................................... 31
8.3.11. ASAX, ASAY, ASAZ: Sensitivity Adjustment values ................................................... 32
9. Example of Recommended External Connection ..................................................................... 33
9.1. I2C Bus Interface ................................................................................................................ 33
9.2. 4-wire SPI .......................................................................................................................... 34
10. Package .................................................................................................................................... 35
10.1. Marking .............................................................................................................................. 35
10.2. Pin Assignment .................................................................................................................. 35
10.3. Outline Dimensions ............................................................................................................ 36
10.4. Recommended Foot Print Pattern ..................................................................................... 37
11. Relationship between the Magnetic Field and Output Code .................................................... 38
MS1356-E-02
-4-
2013/10
[AK8963]
4. Circuit Configuration
4.1.
Block Diagram
3-axis
Hall
sensor
Chopper
SW
PreAMP
Integrator & ADC
MUX
RSTN
OSC1
HE-Drive
Magnetic source
Interface,
Logic
& Register
Timing
Control
Voltage
Reference
SCL/SK
SDA/SI
CSB
SO
DRDY
OSC2
POR
CAD0
4.2.
CAD1
TST1
TRIG
VSS
VDD
RSV
FUSE ROM
VID
Block Function
Block
3-axis Hall sensor
MUX
Chopper SW
HE-Drive
Pre-AMP
Integrator & ADC
OSC1
OSC2
POR
Interface Logic &
Register
Timing Control
Magnetic Source
FUSE ROM
MS1356-E-02
Function
Monolithic Hall elements.
Multiplexer for selecting Hall elements.
Performs chopping.
Magnetic sensor drive circuit for constant-current driving of sensor
Fixed-gain differential amplifier used to amplify the magnetic sensor signal.
Integrates and amplifies pre-AMP output and performs analog-to-digital
conversion.
Generates an operating clock for sensor measurement.
12MHz(typ.)
Generates an operating clock for sequencer.
128kHz(typ.)
Power On Reset circuit. Generates reset signal on rising edge of VDD.
Exchanges data with an external CPU.
DRDY pin indicates sensor measurement end and data is ready to be read.
2
I C bus interface using two pins, namely, SCL and SDA. Standard mode and Fast
mode are supported. The low-voltage specification can be supported by applying
1.65V to the VID pin.
4-wire SPI is also supported by SK, SI, SO and CSB pins.
4-wire SPI works in VID pin voltage down to 1.65V, too.
Generates a timing signal required for internal operation from a clock generated
by the OSC1.
Generates magnetic field for self test of magnetic sensor.
Fuse for adjustment
-5-
2013/10
[AK8963]
4.3.
Pin Function
QFN
Pin
No.
WLCSP
Pin
No.
Pin
name
I/O
Power
supply
system
Type
1
A1
DRDY
O
VID
CMOS
Function
Data Ready output pin.
“H” active. Informs measurement ended and data is ready to be read.
Chip select pin for 4-wire SPI.
2
A2
CSB
I
VID
CMOS
“L” active. Connect to VID when selecting I2C bus interface.
When the I2C bus interface is selected (CSB pin is connected to VID)
SCL: Control data clock input pin
SCL
3
A3
I
VID
CMOS
Input: Schmidt trigger
When the 4-wire SPI is selected
SK
SK: Serial clock input pin
When the I2C bus interface is selected (CSB pin is connected to VID)
SDA
5
SDA: Control data input/output pin
I/O
A4
VID
CMOS
Input: Schmidt trigger, Output: Open drain
When the 4-wire SPI is selected
SI
I
SI: Serial data input pin
15
B1
VDD
-
-
Power
4
B3
RSV
O
VID
CMOS
Analog Power supply pin.
Reserved.
Keep this pin electrically non-connected.
When the I2C bus interface is selected (CSB pin is connected to VID)
Hi-Z output. Keep this pin electrically non-connected.
6
B4
SO
O
VID
CMOS
When the 4-wire SPI is selected
Serial data output pin
13
C1
VSS
-
-
Power
Ground pin.
14
C2
TST1
I
VDD
CMOS
Pulled down by 100kΩ internal resister. Keep this pin electrically
non-connected or connect to VSS.
Test pin.
External trigger pulse input pin.
7
C3
TRG
I
VID
CMOS
Enabled only in External trigger mode. Pulled down by 100kΩ internal
resister. When External trigger mode is not in use, keep this pin
electrically non-connected or connect to VSS.
8
C4
VID
-
-
Power
Digital interface positive power supply pin.
When the I2C bus interface is selected (CSB pin is connected to VID)
CAD0: Slave address 0 input pin
12
D1
CAD0
I
VDD
CMOS
Connect to VSS or VDD.
When the 4-wire serial interface is selected
Connect to VSS.
When the I2C bus interface is selected (CSB pin is connected to VID)
CAD1: Slave address 1 input pin
11
D2
CAD1
I
VDD
CMOS
Connect to VSS or VDD.
When the 4-wire serial interface is selected
Connect to VSS.
10
D4
MS1356-E-02
RSTN
I
VID
CMOS
Reset pin.
Resets registers by setting to “L”. Connect to VID when not in use.
-6-
2013/10
[AK8963]
5. Overall Characteristics
5.1.
Absolute Maximum Ratings
Vss=0V
Parameter
Symbol
Min.
Max.
Unit
V+
-0.3
+4.3
Power supply voltage
V
(Vdd, Vid)
VIN
-0.3
(V+)+0.3
Input voltage
V
IIN
Input current
±10
mA
TST
-40
+125
Storage temperature
°C
(Note 1) If the device is used in conditions exceeding these values, the device may be destroyed. Normal operations
are not guaranteed in such exceeding conditions.
5.2.
Recommended Operating Conditions
Vss=0V
Parameter
Operating temperature
Power supply voltage
5.3.
Remark
VDD pin voltage
VID pin voltage
Symbol
Ta
Vdd
Vid
Min.
-30
2.4
1.65
Typ.
Max.
+85
3.6
Vdd
3.0
Unit
°C
V
V
Electrical Characteristics
The following conditions apply unless otherwise noted:
Vdd=2.4V to 3.6V, Vid=1.65V to Vdd, Temperature range=-30°C to 85°C
5.3.1. DC Characteristics
Parameter
High level input voltage 1
Symbol
VIH1
Low level input voltage 1
VIL1
High level input voltage 2
Low level input voltage 2
High level input voltage 3
Low level input voltage 3
Input current 1
VIH2
VIL2
VIH3
VIL3
IIN1
Input current 2
IIN2
Input current 3
Input current 4
Hysteresis input voltage
(Note 2)
IIN3
IIN4
VHS
High level output voltage 1
Low level output voltage 1
Low level output voltage 2
(Note 3)(Note 4)
Current consumption (Note
5)
VOH1
VOL1
VOL2
SO
DRDY
SDA
IDD1
VDD
VID
IDD2
IDD3
IDD4
Pin
CSB
RSTN
TRG
SK/SCL
SI/SDA
CAD0
CAD1
SK/SCL
SI/SDA
CSB
RSTN
CAD0
CAD1
TRG
TST1
SCL
SDA
Condition
Min.
70%Vid
Typ.
70%Vid
-0.5
70%Vdd
Max.
Unit
V
30%Vid
V
Vid+0.5
30%Vid
Vin=Vss or Vid
-10
30%Vdd
+10
V
V
V
V
µA
Vin=Vss or Vdd
-10
+10
µA
100
100
3
20%Vid
0.4
20%Vid
10
µA
µA
V
V
V
V
V
V
µA
5
10
mA
9
0.1
15
5
mA
µA
Vin=Vid
Vin=Vdd
Vid≥2V
Vid<2V
IOH≥-100µA
IOL≤+100µA
IOL≤3mA Vid≥2V
IOL≤3mA Vid<2V
Power-down mode
Vdd=Vid=3.0V
When magnetic sensor
is driven
Self-test mode
(Note 6)
5%Vid
10%Vid
80%Vid
(Note 2) Schmitt trigger input (reference value for design)
(Note 3) Maximum load capacitance: 400pF (capacitive load of each bus line applied to the I2C bus interface)
(Note 4) Output is open-drain. Connect a pull-up resistor externally.
(Note 5) Without any resistance load
(Note 6) (case1)Vdd=ON, Vid=ON, RSTN pin = “L”. (case2)Vdd=ON, Vid=OFF(0V),RSTN pin = “L”.
MS1356-E-02
-7-
2013/10
[AK8963]
(case3)Vdd=Off(0V), Vid=On.
5.3.2. AC Characteristics
Parameter
Power supply rise time
(Note 7)
Symbol
PSUP
POR completion time
(Note 7)
PORT
Power supply turn off
voltage
Power supply turn on
interval (Note 7)
SDV
Wait time before mode
setting
PSINT
Pin
VDD
VID
VDD
VID
VDD
VID
Condition
Period of time that VDD
(VID) changes from 0.2V
to Vdd (Vid). (Note 8)
Period of time after PSUP
to Power-down mode
(Note 8)
Turn off voltage to enable
POR to restart (Note 8)
Period of time that voltage
lower than SDV needed to
be kept to enable POR to
restart (Note 8)
Twat
Min.
Typ.
Max.
50
Unit
ms
100
µs
0.2
V
100
µs
100
µs
(Note 7) Reference value for design
(Note 8) When POR circuit detects the rise of VDD/VID voltage, it resets internal circuits and initializes the
registers. After reset, AK8963 transits to Power-down mode.
Powe down mode
Power down mode
PORT:100µs
VDD/(VID)
SDV:0.2V
0V
PSUP:50ms
Parameter
Trigger input effective
pulse width
Trigger input effective
frequency (Note 9)
PSINT:100µs
Symbol
tTRIGH
Pin
TRG
tTRIGf
TRG
Condition
Min.
200
Typ.
Max.
Unit
ns
100
Hz
(Note 9) The value when the period of time from the end of the measurement to the next trigger input is 1.3ms.
tTRIGH
VIH
MS1356-E-02
-8-
2013/10
[AK8963]
Parameter
Reset input effective pulse
width (“L”)
Symbol
tRSTL
Pin
RSTN
Condition
Min.
5
Typ.
Max.
Unit
µs
tRSTL
VIL
5.3.3. Analog Circuit Characteristics
Parameter
Measurement data output bit
Time for measurement
Magnetic sensor sensitivity
Symbol
Condition
DBIT BIT = “0”
BIT = “1”
TSM
Single measurement mode
BSE
Tc=25°C (Note 10)
BIT = “0”
BIT = “1”
Tc=25°C (Note 10)
Min.
0.57
0.1425
±4912
Typ.
14
16
7.2
Max.
Unit
bit
9
ms
0.6
0.15
0.63
0.1575
µT/LSB
BRG
Magnetic sensor measurement
µT
range (Note 11)
Tc=25°C
-500
500
LSB
Magnetic sensor initial offset
BIT = “0”
(Note 12)
(Note 10) Value after sensitivity is adjusted using sensitivity fine adjustment data stored in Fuse ROM. (Refer to
8.3.11 for how to adjust.)
(Note 11) Reference value for design
(Note 12) Value of measurement data register on shipment without applying magnetic field on purpose.
MS1356-E-02
-9-
2013/10
[AK8963]
5.3.4. 4-wire SPI
4-wire SPI is compliant with mode 3
Parameter
CSB setup time
Data setup time
Data hold time
SK high time
Symbol
Tcs
Ts
Th
Twh
SK low time
Condition
Vid≥2.5V
2.5V>Vid≥1.65V
Vid≥2.5V
2.5V>Vid≥1.65V
Twl
SK setup time
Tsd
SK to SO delay time
Tdd
(Note 13)
CSB to SO delay time
Tcd
(Note 13)
SK rise time (Note 14)
Tr
SK fall time (Note 14)
Tf
CSB high time
Tch
(Note 13) SO load capacitance: 20pF
(Note 14) Reference value for design.
Min.
50
50
50
100
150
100
150
50
Typ.
Max.
50
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
50
ns
100
100
ns
ns
ns
150
[4-wire SPI]
Tch
Tcs
Tsd
CSB
Ts
Th
Tdd
Twh
Tcd
Twl
SK
SI
Hi-Z
Hi-Z
SO
[Rise time and fall time]
Tr
Tf
0.9Vid
0.1Vid
SK
MS1356-E-02
- 10 -
2013/10
[AK8963]
5.3.5. I2C Bus Interface
CSB pin = “H”
I2C bus interface is compliant with Standard mode and Fast mode. Standard/Fast mode is selected
automatically by fSCL.
(1) Standard mode
fSCL≤100kHz
Symbol
fSCL
tHIGH
tLOW
tR
tF
tHD:STA
tSU:STA
tHD:DAT
tSU:DAT
tSU:STO
tBUF
Parameter
SCL clock frequency
SCL clock "High" time
SCL clock "Low" time
SDA and SCL rise time
SDA and SCL fall time
Start Condition hold time
Start Condition setup time
SDA hold time (vs. SCL falling edge)
SDA setup time (vs. SCL rising edge)
Stop Condition setup time
Bus free time
Min.
Typ.
Max.
100
Unit
kHz
µs
µs
µs
µs
µs
µs
µs
ns
µs
µs
4.0
4.7
1.0
0.3
4.0
4.7
0
250
4.0
4.7
(2) Fast mode
100kHz<fSCL≤400kHz
Symbol
fSCL
tHIGH
tLOW
tR
tF
tHD:STA
tSU:STA
tHD:DAT
tSU:DAT
tSU:STO
tBUF
tSP
Parameter
SCL clock frequency
SCL clock "High" time
SCL clock "Low" time
SDA and SCL rise time
SDA and SCL fall time
Start Condition hold time
Start Condition setup time
SDA hold time (vs. SCL falling edge)
SDA setup time (vs. SCL rising edge)
Stop Condition setup time
Bus free time
Noise suppression pulse width
Min.
Typ.
Max.
400
Unit
kHz
µs
µs
µs
µs
µs
µs
µs
ns
µs
µs
ns
0.6
1.3
0.3
0.3
0.6
0.6
0
100
0.6
1.3
50
[I2C bus interface timing]
1/fSCL
VIH2
SCL
VIL2
VIH2
SDA
VIL2
tLOW
tBUF
tR
tHIGH
tF
tSP
VIH2
SCL
VIL2
tHD:STA
Stop
tHD:DAT
tSU:DAT
tSU:STA
tSU:STO
Start
Stop
Start
MS1356-E-02
- 11 -
2013/10
[AK8963]
6. Functional Explanation
6.1.
Power States
When VDD and VID are turned on from Vdd=OFF (0V) and Vid=OFF (0V), all registers in AK8963 are
initialized by POR circuit and AK8963 transits to Power-down mode.
All the states in the table below can be set, although the transition from state 2 to state 3 and the transition from
state 3 to state 2 are prohibited.
Table 6.1
State
1
6.2.
VDD
OFF (0V)
VID
OFF (0V)
2
3
OFF (0V)
2.4V to 3.6V
1.65V to 3.6V
OFF (0V)
4
2.4V to 3.6V
1.65V to Vdd
Power state
OFF (0V).
It doesn’t affect external interface. Digital input
pins other than SCL and SDA pin should be fixed
to “L”(0V).
OFF (0V). It doesn’t affect external interface.
OFF (0V).
It doesn’t affect external interface. Digital input
pins other than SCL and SDA pin should be fixed
to “L” (0V).
ON
Reset Functions
When the power state is ON, always keep Vid≤Vdd.
Power-on reset (POR) works until Vdd reaches to the operation effective voltage (about 1.4V: reference value
for design) on power-on sequence. After POR is deactivated, all registers are initialized and transits to power
down mode.
When Vdd=2.4 ~ 3.6V, POR circuit and VID monitor circuit are active. When Vid=0V, AK8963 is in reset
status and it consumes the current of reset state (IDD4).
AK8963 has four types of reset;
(1) Power on reset (POR)
When Vdd rise is detected, POR circuit operates, and AK8963 is reset.
(2) VID monitor
When Vid is turned OFF (0V), AK8963 is reset.
(3) Reset pin (RSTN)
AK8963 is reset by Reset pin. When Reset pin is not used, connect to VID.
(4) Soft reset
AK8963 is reset by setting SRST bit.
When AK8963 is reset, all registers are initialized and AK8963 transits to Power-down mode.
MS1356-E-02
- 12 -
2013/10
[AK8963]
6.3.
Operation Modes
AK8963 has following seven operation modes:
(1) Power-down mode
(2) Single measurement mode
(3) Continuous measurement mode 1
(4) Continuous measurement mode 2
(5) External trigger measurement mode
(6) Self-test mode
(7) Fuse ROM access mode
By setting CNTL1 register MODE[3:0] bits, the operation set for each mode is started.
A transition from one mode to another is shown below.
MODE[3:0]=“0001”
Power-down
mode
MODE[3:0]=“0000”
Single measurement mode
Sensor is measured for one time and data is output.
Transits to Power-down mode automatically after
measurement ended.
Transits automatically
MODE[3:0]=“0010”
MODE[3:0]=“0000”
MODE[3:0]=“0110”
MODE[3:0]=“0000”
MODE[3:0]=“0100”
MODE[3:0]=“0000”
MODE[3:0]=“1000
MODE[3:0]=“0000”
Continuous measurement mode 1
Sensor is measured periodically in 8Hz.
Transits to Power-down mode by writing
MODE[3:0]=“0000”.
Continuous measurement mode 2
Sensor is measured periodically in 100Hz.
Transits to Power-down mode by writing
MODE[3:0]=“0000”.
External trigger measurement mode
Sensor is measured for one time by external trigger.
Waits for next trigger after data is output. Transits to
Power-down mode by writing MODE[3:0]=“0000”.
Self-test mode
Sensor is self-tested and the result is output. Transits
to Power-down mode automatically.
Transits automatically
MODE[3:0]=“1111
MODE[3:0]=“0000”
Fuse ROM access mode
Turn on the circuit needed to read out Fuse ROM.
Transits to Power-down mode by writing
MODE[3:0]=“0000”.
Figure 6.1 Operation modes
When power is turned ON, AK8963 is in power-down mode. When a specified value is set to MODE[3:0],
AK8963 transits to the specified mode and starts operation. When user wants to change operation mode, transit
to power-down mode first and then transit to other modes. After power-down mode is set, at least 100µs(Twat)
is needed before setting another mode.
MS1356-E-02
- 13 -
2013/10
[AK8963]
6.4.
Description of Each Operation Mode
6.4.1. Power-down Mode
Power to almost all internal circuits is turned off. All registers are accessible in power-down mode. However,
fuse ROM data cannot be read correctly. Data stored in read/write registers are remained. They can be reset by
soft reset.
6.4.2. Single Measurement Mode
When single measurement mode (MODE[3:0]=“0001”) is set, sensor is measured, and after sensor
measurement and signal processing is finished, measurement data is stored to measurement data registers
(HXL to HZH), then AK8963 transits to power-down mode automatically. On transition to power-down mode,
MODE[3:0] turnes to “0000”. At the same time, DRDY bit in ST1 register turnes to “1”. This is called “Data
Ready”. When any of measurement data register (HXL to HZH) or ST2 register is read, DRDY bit turnes to
“0”. It remains “1” on transition from Power-down mode to another mode. DRDY pin is in the same state as
DRDY bit. (Refer to Figure 6.2.)
When sensor is measuring (Measurement period), measurement data registers (HXL ~ HZH) keep the
previous data. Therefore, it is possible to read out data even in measurement period. Data read out in
measurement period are previous data. (Refer to Figure 6.3.)
Operation Mode:
Power-down
Single measuremnet
(1)
(2)
(3)
Measurement period
Measurement Data Register
Last Data
Measurement Data (1)
Data(2)
Data(3)
DRDY
Data read
Data(1)
Register Write
Data(3)
MODE[3:0]="0001"
MODE[3:0]="0001"
MODE[3:0]="0001"
Figure 6.2 Single measurement mode: when data is read out of measurement period
Operation Mode:
Power-down
Single measuremnet
(1)
(2)
(3)
Measurement period
Measurement Data Register
Last Data
Measurement Data (1)
Data(2)
Data(3)
DRDY
Data read
Data(1)
Register Write
MODE[3:0]="0001"
MODE[3:0]="0001"
MODE[3:0]="0001"
Figure 6.3 Single measurement mode: when data read started during measurement period
MS1356-E-02
- 14 -
2013/10
[AK8963]
6.4.3. Continuous Measurement Mode 1 and 2
When continuous measurement mode 1 (MODE[3:0]=“0010”) or 2 (MODE[3:0]=“0110”) is set, sensor is
measured periodically at 8Hz or 100Hz respectively. When sensor measurement and signal processing is
finished, measurement data is stored to measurement data registers (HXL ~ HZH) and all circuits except for
the minimum circuit required for counting cycle lentgh are turned off (PD). When the next measurement
timing comes, AK8963 wakes up automatically from PD and starts measurement again.
Continuous measurement mode ends when power-down mode (MODE[3:0]=“0000”) is set. It repeats
measurement until power-down mode is set.
When continuous measurement mode 1 (MODE[3:0]=“0010”) or 2 (MODE[3:0]= “0110”) is set again while
AK8963 is already in continuous measurement mode, a new measurement starts. ST1, ST2 and measurement
data registers (HXL ~ HZH) will not be initialized by this.
(N-1)th
PD
Nth
Measurement
(N+1)th
Measurement
PD
PD
8Hz or 100Hz
Figure 6.4 Continuous measurement mode
6.4.3.1. Data Ready
When measurement data is stored and ready to be read, DRDY bit in ST1 register turnes to “1”. This is called
“Data Ready”. DRDY pin is in the same state as DRDY bit. When measurement is performed correctly,
AK8963 becomes Data Ready on transition to PD after measurement.
6.4.3.2. Normal Read Sequence
(1) Check Data Ready or not by any of the following method.
- Polling DRDY bit of ST1 register
- Monitor DRDY pin
When Data Ready, proceed to the next step.
(2) Read ST1 register (not needed when polling ST1)
DRDY:
Shows Data Ready or not. Not when “0”, Data Ready when “1”.
DOR:
Shows if any data has been skipped before the current data or not. There are no skipped data
when “0”, there are skipped data when “1”.
(3) Read measurement data
When any of measurement data register (HXL ~ HZH) or ST2 register is read, AK8963 judges that data
reading is started. When data reading is started, DRDY bit and DOR bit turnes to “0”.
(4) Read ST2 register (required)
HOFL:
Shows if magnetic sensor is overflown or not. “0” means not overflown, “1” means
overflown.
When ST2 register is read, AK8963 judges that data reading is finished. Stored measurement data is
protected during data reading and data is not updated. By reading ST2 register, this protection is released.
It is required to read ST2 register after data reading.
MS1356-E-02
- 15 -
2013/10
[AK8963]
(N-1)th
PD
Nth
Measurement
(N+1)th
Measurement
PD
Measurement Data Register
(N-1)th
Nth
PD
(N+1)
DRDY
Data read
ST1 Data(N)
ST2
ST1 Data(N+1)
ST2
Figure 6.5 Normal read sequesnce
6.4.3.3. Data Read Start During Measurement
When sensor is measuring (Measurement period), measurement data registers (HXL ~ HZH) keep the
previous data. Therefore, it is possible to read out data even in measurement period. If data is started to be read
during measurement period, previous data is read.
(N-1)th
PD
Nth
Measurement
(N+1)th
Measurement
PD
PD
Measurement Data Register
(N-1)th
Nth
DRDY
Data read
ST1 Data(N)
ST2
ST1 Data(N)
ST2
Figure 6.6 Data read start during measuremnet
MS1356-E-02
- 16 -
2013/10
[AK8963]
6.4.3.4. Data Skip
When Nth data was not read before (N+1)th measurement ends, Data Ready remains until data is read. In this
case, a set of measurement data is skipped so that DOR bit turnes to “1”. (Refer to Figure 6.7)
When data reading started after Nth measurement ended and did not finish reading before (N+1)th
measurement ended, Nth measurement data is protected to keep correct data. In this case, a set of measurement
data is skipped and not stored so that DOR bit turnes to “1”. (Refer to Figure 6.8)
In both case, DOR bit turnes to “0” at the next start of data reading.
(N-1)th
PD
Nth
Measurement
(N+1)th
Measurement
PD
Measurement Data Register
(N-1)th
Nth
PD
(N+1)
DRDY
DOR
Data read
ST1 Data(N+1)
ST2
Figure 6.7 Data Skip: When data is not read
(N-1)th
PD
Nth
Measurement
(N+1)th
PD
(N+2)th
PD
Measurement
PD
Measurement
Measurement Data Register
(N-1)th
Nth
(N+2)
Data register is protedted
because data is being read
Not data ready
because data is not updated
DRDY
(N+1)th data is skipped
DOR
Data read
ST1 DataN
ST2
ST1 Data(N+2)
Figure 6.8 Data Skip: When data read has not been finished before the next measurement ends
6.4.3.5. End Operation
Set power-down mode (MODE[3:0]=“0000”) to end continuous measurement mode.
MS1356-E-02
- 17 -
2013/10
[AK8963]
6.4.3.6. Magnetic Sensor Overflow
AK8963 has the limitation for measurement range that the sum of absolute values of each axis should be
smaller than 4912μT.
|X|+|Y|+|Z| < 4912μT
When the magnetic field exceeded this limitation, data stored at measurement data are not correct. This is
called Magnetic Sensor Overflow.
When magnetic sensor overlow occurs, HOFL bit turns to “1”. When the next measurement starts, it returns to
“0”.
6.4.4. External Trigger Measurement Mode
When external trigger measurement mode (MODE[3:0]=“0100”) is set, AK8963 waits for trigger input. When
a pulse is input from TRG pin, sensor measurement is started on the rising edge of TRG pin. When sensor
measurement and signal processing is finished, measurement data is stored to measurement data registers
(HXL to HZH) and all circuits except for the minimum circuit required for trigger input waiting are turned off
(PD state). When the next pulse is input, AK8963 wakes up automatically from PD and starts measurement
again.
External trigger measurement mode ends when power-down mode (MODE[3:0]=“0000”) is set. AK8963
keeps waiting for the trigger input until the power-down mode is set.
When external trigger measurement mode (MODE[3:0]=“0100”) is set again while AK8963 is already in
external trigger measurement mode, it starts to wait for the trigger input again. The trigger input is ignored
while sensor is measuring.
Data read sequence and functions of read-only registers in external trigger measurement mode is the same as
continuous measurement mode.
MS1356-E-02
- 18 -
2013/10
[AK8963]
6.4.5. Self-test Mode
Self-test mode is used to check if the sensor is working normally.
When self-test mode (MODE[3:0]=“1000”) is set, magnetic field is generated by the internal magnetic source
and sensor is measured. Measurement data is stored to measurement data registers (HXL to HZH), then
AK8963 transits to power-down mode automatically.
Before setting self-test mode, write “1” to SELF bit of ASTC register. Data read sequence and functions of
read-only registers in self-test mode is the same as single measurement mode.
When self-test is end, write “0” to SELF bit then proceed to other operation.
<Self-test Sequence>
(1) Set Power-down mode. (MODE[3:0]=“0000”)
(2) Write “1” to SELF bit of ASTC register (other bits in this register should be kept “0”)
(3) Set Self-test Mode. (MODE[3:0]=“1000”)
(4) Check Data Ready or not by any of the following method.
- Polling DRDY bit of ST1 register
- Monitor DRDY pin
When Data Ready, proceed to the next step.
(5) Read measurement data (HXL to HZH)
(6) Write “0” to SELF bit of ASTC register
(7) Set Power-down mode. (MODE[3:0]=“0000”)
<Self-test Judgement>
When measurement data read by the above sequence is in the range of following table after sensitivity
adjustment (refer to 8.3.11), AK8963 is working normally.
14-bit output(BIT=“0”)
Criteria
HX[15:0]
HY[15:0]
HZ[15:0]
-50 =< HX =< 50
-50 =< HY =< 50
-800 =< HZ =< -200
HX[15:0]
HY[15:0]
HZ[15:0]
-200 =< HX =< 200
-200 =< HY =< 200
-3200 =< HZ =< -800
16-bit output(BIT=“1”)
Criteria
6.4.6. Fuse ROM Access Mode
Fuse ROM access mode is used to read Fuse ROM data. Sensitivity adjustment data for each axis is stored in
fuse ROM.
Set Fuse ROM Access mode (MODE[3:0]=“1111”) before reading Fuse ROM data. When Fuse ROM Access
mode is set, circuits reauired for reading fuse ROM are turned on.
After reading fuse ROM data, set power-down mode (MODE[3:0]=“0000”) before the transition to another
mode.
MS1356-E-02
- 19 -
2013/10
[AK8963]
7. Serial Interface
AK8963 supports I2C bus interface and 4-wire SPI. A selection is made by CSB pin. When used as 3-wire SPI,
set SI pin and SO pin wired-OR externally.
CSB pin=“L”:
4-wire SPI
CSB pin=“H”: I2C bus interface
7.1.
4-wire SPI
The 4-wire SPI consists of four digital signal lines: SK, SI, SO, and CSB, and is provided in 16bit protocol.
Data consists of Read/Write control bit (R/W), register address (7bits) and control data (8bits).
To read out all axes measuremen data (X, Y, Z), an option to read out more than one byte data using automatic
increment command is available. (Sequencial read operation)
CSB pin is low active. Input data is taken in on the rising edge of SK pin, and output data is changed on the
falling edge of SK pin. (SPI MODE3)
Communication starts when CSB pin transits to “L” and stops when CSB pin transits to “H”. SK pin must be
“H” during CSB pin is in transition. Also, it is prohibited to change SI pin during CSB pin is “H” and SK pin is
“H”.
7.1.1. Writing Data
Input 16 bits data on SI pin in synchronous with the 16-bit serial clock input on SK pin. Out of 16 bits input
data, the first 8 bits specify the R/W control bit (R/W=“0” when writing) and register address (7bits), and the
latter 8 bits are control data (8bits). When any of addresses listed on Table 8.1 is input, AK8963 recognizes
that it is selected and takes in latter 8 bits as setting data.
If the number of clock pulses is less than 16, no data is written. If the number of clock pulses is more than 16,
data after the 16th clock pulse on SI pin are ignored.
It is not compliant with sereal write operation for multiple addresses.
CSB
1
2
3
4
5
6
7
8
9
RW
A6
A5
A4
A3
A2
A1
A0
D7
10
11
12
13
14
15
16
SK
SI
D6
D5
D4
D3
D2
D1
D0
(INPUT)
SO
Hi-Z
(OUTPUT)
Figure 7.1 4-wire SPI Writing Data
MS1356-E-02
- 20 -
2013/10
[AK8963]
7.1.2. Reading Data
Input the R/W control bit (R/W=“1”) and 7 bit register address on SI pin in synchronous with the first 8 bits of
the 16 bits of a serial clock input on SK pin. Then AK8963 outputs the data held in the specified register with
MSB first from SO pin.
When clocks are input continuously after one byte of data is read, the address is incremented and data in the
next address is output. Accordingly, after the falling edge of the 15th clock and CSB pin is “L”, the data in the
next address is output on SO pin. When CSB pin is driven “L” to “H”, SO pin is placed in the high-impedance
state.
AK8963 has two incrementation lines; 00H ~ 0CH and 10H ~ 12H. For example, data is read as follows: 00H
-> 01H ... -> 0BH -> 0CH -> 00H -> 01H ..., or 10H -> 11H -> 12H -> 10H …
0DH and 0EH are reserved addresses. Do not access to those addresses. When specified address is other than
00H ~ 12H, AK8963 recognizes that it is not selected and keeps SO pin in high-impedance state. Therefore,
user can use other addresses for other devices.
CSB
1
2
3
4
5
6
7
8
RW
A6
A5
A4
A3
A2
A1
A0
9
10
11
12
13
14
15
16
SK
SI
(INPUT)
SO
(OUTPUT)
Hi-Z
Hi-Z
D7
D6
D5
D4
D3
D2
D1
D0
Figure 7.2 4-wire SPI Reading Data
MS1356-E-02
- 21 -
2013/10
[AK8963]
7.2.
I2C Bus Interface
The I2C bus interface of AK8963 supports the standard mode (100 kHz max.) and the fast mode (400 kHz
max.).
7.2.1. Data Transfer
To access AK8963 on the bus, generate a start condition first.
Next, transmit a one-byte slave address including a device address. At this time, AK8963 compares the slave
address with its own address. If these addresses match, AK8963 generates an acknowledgement, and then
executes READ or WRITE instruction. At the end of instruction execution, generate a stop condition.
7.2.1.1. Change of Data
A change of data on the SDA line must be made during "Low" period of the clock on the SCL line. When the
clock signal on the SCL line is "High", the state of the SDA line must be stable. (Data on the SDA line can be
changed only when the clock signal on the SCL line is "Low".)
During the SCL line is "High", the state of data on the SDA line is changed only when a start condition or a
stop condition is generated.
SCL
SDA
DATA LINE
STABLE :
DATA VALID
CHANGE
OF DATA
ALLOWED
Figure 7.3 Data Change
7.2.1.2. Start/Stop Condition
If the SDA line is driven to "Low" from "High" when the SCL line is "High", a start condition is generated.
Every instruction starts with a start condition.
If the SDA line is driven to "High" from "Low" when the SCL line is "High", a stop condition is generated.
Every instruction stops with a stop condition.
SCL
SDA
START CONDITION
STOP CONDITION
Figure 7.4 Start and Stop Conditions
MS1356-E-02
- 22 -
2013/10
[AK8963]
7.2.1.3. Acknowledge
The IC that is transmitting data releases the SDA line (in the "High" state) after sending 1-byte data.
The IC that receives the data drives the SDA line to "Low" on the next clock pulse. This operation is referred as
acknowledge. With this operation, whether data has been transferred successfully can be checked.
AK8963 generates an acknowledge after reception of a start condition and slave address.
When a WRITE instruction is executed, AK8963 generates an acknowledge after every byte is received.
When a READ instruction is executed, AK8963 generates an acknowledge then transfers the data stored at the
specified address. Next, AK8963 releases the SDA line then monitors the SDA line. If a master IC generates
an acknowledge instead of a stop condition, AK8963 transmits the 8bit data stored at the next address. If no
acknowledge is generated, AK8963 stops data transmission.
Clock pulse
for acknowledge
SCL FROM
MASTER
1
8
9
DATA
OUTPUT BY
TRANSMITTER
not acknowledge
DATA
OUTPUT BY
RECEIVER
START
CONDITION
acknowledge
Figure 7.5 Generation of Acknowledge
7.2.1.4. Slave Address
The slave address of AK8963 can be selected from the following list by setting CAD0/1 pin. When CAD pin is
fixed to VSS, the corresponding slave address bit is “0”. When CAD pin is fixed to VDD, the corresponding
slave address bit is “1”.
Table 7.1 Slave Address and CAD0/1 pin
CAD1
CAD0
Slave Address
0
0
0CH
0
1
0DH
1
0
0EH
1
1
0FH
MSB
0
LSB
0
0
1
1
CAD1
CAD0
R/W
Figure 7.6 Slave Address
The first byte including a slave address is transmitted after a start condition, and an IC to be accessed is
selected from the ICs on the bus according to the slave address.
When a slave address is transferred, the IC whose device address matches the transferred slave address
generates an acknowledge then executes an instruction. The 8th bit (least significant bit) of the first byte is a
R/W bit.
When the R/W bit is set to "1", READ instruction is executed. When the R/W bit is set to "0", WRITE
instruction is executed.
MS1356-E-02
- 23 -
2013/10
[AK8963]
7.2.2. WRITE Instruction
When the R/W bit is set to "0", AK8963 performs write operation.
In write operation, AK8963 generates an acknowledge after receiving a start condition and the first byte (slave
address) then receives the second byte. The second byte is used to specify the address of an internal control
register and is based on the MSB-first configuration.
MSB
A7
LSB
A6
A5
A4
A3
A2
A1
A0
Figure 7.7 Register Address
After receiving the second byte (register address), AK8963 generates an acknowledge then receives the third
byte.
The third and the following bytes represent control data. Control data consists of 8 bits and is based on the
MSB-first configuration. AK8963 generates an acknowledge after every byte is received. Data transfer always
stops with a stop condition generated by the master.
MSB
D7
LSB
D6
D5
D4
D3
D2
D1
D0
Figure 7.8 Control Data
AK8963 can write multiple bytes of data at a time.
After reception of the third byte (control data), AK8963 generates an acknowledge then receives the next data.
If additional data is received instead of a stop condition after receiving one byte of data, the address counter
inside the LSI chip is automatically incremented and the data is written at the next address.
The address is incremented from 00H to 0CH or from 10H to12H. When the address is in 00H~0CH, the
address goes back to 00H after 0CH. When the address is in 10H~12H, the address goes back to 10H after 12H.
Actual data is written only to Read/Write registers (refer to 8.2).
S
T
A
R
T
SDA
S
S
T
O
P
R/W="0"
Slave
Address
Register
Address(n)
A
C
K
Data(n)
A
C
K
Data(n+1)
A
C
K
Data(n+x)
A
C
K
A
C
K
P
A
C
K
Figure 7.9 WRITE Instruction
MS1356-E-02
- 24 -
2013/10
[AK8963]
7.2.3. READ Instruction
When the R/W bit is set to "1", AK8963 performs read operation.
If a master IC generates an acknowledge instead of a stop condition after AK8963 transfers the data at a
specified address, the data at the next address can be read.
Address can be 00H~0CH and/or 10H~12H.When address is counted up to 0CH in 00H~0CH, the next
address returns to 00H. When address is counted up to 12H in 10H~12H, the next address returns to 10H.
AK8963 supports one byte read and multiple byte read.
7.2.3.1. One Byte READ
AK8963 has an address counter inside the LSI chip. In current address read operation, the data at an address
specified by this counter is read.
The internal address counter holds the next address of the most recently accessed address.
For example, if the address most recently accessed (for READ instruction) is address "n", and a current address
read operation is attempted, the data at address "n+1" is read.
In one byte read operation, AK8963 generates an acknowledge after receiving a slave address for the READ
instruction (R/W bit="1"). Next, AK8963 transfers the data specified by the internal address counter starting
with the next clock pulse, then increments the internal counter by one. If the master IC generates a stop
condition instead of an acknowledge after AK8963 transmits one byte of data, the read operation stops.
S
T
A
R
T
SDA
S
S
T
O
P
R/W="1"
Slave
Address
Data(n)
A
C
K
Data(n+1)
A
C
K
Data(n+2)
A
C
K
Data(n+x)
A
C
K
P
A
C
K
Figure 7.10 One Byte READ
7.2.3.2. Multiple Byte READ
By multiple byte read operation, data at an arbitrary address can be read.
The multiple byte read operation requires to execute WRITE instruction as dummy before a slave address for
the READ instruction (R/W bit="1") is transmitted. In random read operation, a start condition is first
generated then a slave address for the WRITE instruction (R/W bit="0") and a read address are transmitted
sequentially.
After AK8963 generates an acknowledge in response to this address transmission, a start condition and a slave
address for the READ instruction (R/W bit="1") are generated again. AK8963 generates an acknowledge in
response to this slave address transmission. Next, AK8963 transfers the data at the specified address then
increments the internal address counter by one. If the master IC generates a stop condition instead of an
acknowledge after data is transferred, the read operation stops.
S
T
A
R
T
SDA
S
S
T
A
R
T
R/W="0"
Slave
Address
Register
Address(n)
A
C
K
S
A
C
K
S
T
O
P
R/W="1"
Data(n)
Slave
Address
A
C
K
Data(n+1)
A
C
K
Data(n+x)
A
C
K
P
A
C
K
Figure 7.11 Multiple Byte READ
MS1356-E-02
- 25 -
2013/10
[AK8963]
8. Registers
8.1.
Description of Registers
AK8963 has registers of 20 addresses as indicated in Table 8.1. Every address consists of 8 bits data. Data is
transferred to or received from the external CPU via the serial interface described previously.
Table 8.1 Register Table
Name
Address
WIA
INFO
ST1
HXL
HXH
HYL
HYH
HZL
HZH
ST2
CNTL1
CNTL2
ASTC
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
TS1
0DH
TS2
0EH
I2CDIS
0FH
ASAX
ASAY
ASAZ
RSV
10H
11H
12H
13H
READ/
WRITE
READ
READ
READ
READ
Description
Device ID
Information
Status 1
Measurement data
READ
READ/
WRITE
Status 2
Control 1
Control 2
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ/
WRITE
READ
READ
READ
READ
Self-test
Bit
width
8
8
8
8
8
8
8
8
8
8
8
8
8
Explanation
Data status
X-axis data
Y-axis data
Z-axis data
Data status
Function Control
Test 1
8
DO NOT ACCESS
Test 2
8
DO NOT ACCESS
I2C disable
8
X-axis sensitivity adjustment value
Y-axis sensitivity adjustment value
Z-axis sensitivity adjustment value
Reserved
8
8
8
8
Fuse ROM
Fuse ROM
Fuse ROM
DO NOT ACCESS
Addresses 00H~0CH and 10H~12H are compliant with automatic increment function of serial interface
respectively. Values of addresses 10H~12H can be read only in Fuse ROM access mode. In other modes, read
data is not correct.
MS1356-E-02
- 26 -
2013/10
[AK8963]
8.2.
Register Map
Register
D7
Name
Read-only Register
00H
WIA
0
01H
INFO
INFO7
02H
ST1
03H
HXL
HX7
04H
HXH
HX15
05H
HYL
HY7
06H
HYH
HY15
07H
HZL
HZ7
08H
HZH
HZ15
09H
ST2
0
Write/read Register
0AH
CNTL1
0
0BH
CNTL2
0
0CH
ASTC
0DH
TS1
0EH
TS2
0FH
I2CDIS I2CDIS7
Read-only Register
10H
ASAX
COEFX7
11H
ASAY
COEFY7
12H
ASAZ
COEFZ7
13H
RSV
Addr
D6
Table 8.2 Register Map
D5
D4
D3
D2
D1
D0
0
INFO2
0
HX2
HX10
HY2
HY10
HZ2
HZ10
0
0
INFO1
DOR
HX1
HX9
HY1
HY9
HZ1
HZ9
0
0
INFO0
DRDY
HX0
HX8
HY0
HY8
HZ0
HZ8
0
1
INFO6
0
HX6
HX14
HY6
HY14
HZ6
HZ14
0
0
INFO5
0
HX5
HX13
HY5
HY13
HZ5
HZ13
0
0
INFO4
HX4
HX12
HY4
HY12
HZ4
HZ12
BITM
1
INFO3
0
HX3
HX11
HY3
HY11
HZ3
HZ11
HOFL
0
0
SELF
I2CDIS6
0
0
I2CDIS5
BIT
0
I2CDIS4
MODE3
0
I2CDIS3
COEFX6
COEFY6
COEFZ6
-
COEFX5
COEFY5
COEFZ5
-
COEFX4
COEFY4
COEFZ4
-
COEFX3 COEFX2 COEFX1 COEFX0
COEFY3 COEFY2 COEFY1 COEFY0
COEFZ3 COEFZ2 COEFZ1 COEFZ0
-
MODE2 MODE1 MODE0
0
0
SRST
I2CDIS2 I2CDIS1 I2CDIS0
When VDD is turned ON, POR function works and all registers of AK8963 are initialized regardless of VID
status. To write data to or to read data from register, VID must be ON.
TS1 and TS2 are test registers for shipment test. Do not use these registers.
RSV is reserved register. Do not use this register.
MS1356-E-02
- 27 -
2013/10
[AK8963]
8.3.
Detailed Description of Registers
8.3.1. WIA: Device ID
Register
name
Read-only register
00H
WIA
Addr
D7
D6
D5
D4
D3
D2
D1
D0
0
1
0
0
1
0
0
0
Device ID of AKM. It is described in one byte and fixed value.
48H: fixed
8.3.2. INFO: Information
Register
name
Read-only register
01H
INFO
Addr
D7
D6
D5
D4
D3
D2
D1
D0
INFO7
INFO6
INFO5
INFO4
INFO3
INFO2
INFO1
INFO0
INFO[7:0]: Device information for AKM.
8.3.3. ST1: Status 1
Register
name
Read-only register
02H
ST1
Reset
Addr
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
0
0
DOR
0
DRDY
0
DRDY: Data Ready
"0":
Normal
"1":
Data is ready
DRDY bit turns to “1” when data is ready in single measurement mode, continuous measurement mode1,
2, external trigger measurement mode or self-test mode. It returns to “0” when any one of ST2 register or
measurement data register (HXL~HZH) is read.
DOR: Data Overrun
"0":
Normal
"1":
Data overrun
DOR bit turns to “1” when data has been skipped in continuous measurement mode or external trigger
measurement mode. It returns to “0” when any one of ST2 register or measurement data register
(HXL~HZH) is read.
MS1356-E-02
- 28 -
2013/10
[AK8963]
8.3.4. HXL to HZH: Measurement Data
Addr Register name
Read-only register
03H
HXL
04H
HXH
05H
HYL
06H
HYH
07H
HZL
08H
HZH
Reset
D7
D6
D5
D4
D3
D2
D1
D0
HX7
HX15
HY7
HY15
HZ7
HZ15
0
HX6
HX14
HY6
HY14
HZ6
HZ14
0
HX5
HX13
HY5
HY13
HZ5
HZ13
0
HX4
HX12
HY4
HY12
HZ4
HZ12
0
HX3
HX11
HY3
HY11
HZ3
HZ11
0
HX2
HX10
HY2
HY10
HZ2
HZ10
0
HX1
HX9
HY1
HY9
HZ1
HZ9
0
HX0
HX8
HY0
HY8
HZ0
HZ8
0
Measurement data of magnetic sensor X-axis/Y-axis/Z-axis
HXL[7:0]: X-axis measurement data lower 8bit
HXH[15:8]: X-axis measurement data higher 8bit
HYL[7:0]: Y-axis measurement data lower 8bit
HYH[15:8]: Y-axis measurement data higher 8bit
HZL[7:0]: Z-axis measurement data lower 8bit
HZH[15:8]: Z-axis measurement data higher 8bit
Measuremnet data is stored in two’s complement and Little Endian format. Measurement range of each
axis is -8190 ~ +8190 in decimal in 14-bit output, and -32760 ~ 32760 in 16-bit output.
Table 8.3 Measurement data format
Measurement data (each axis) [15:0]
Two’s complement
Hex
Decimal
14-bit output
0001 1111 1111 1110
1FFE
8190
|
|
|
0000 0000 0000 0001
0001
1
0000 0000 0000 0000
0000
0
1111 1111 1111 1111
FFFF
-1
|
|
|
1110 0000 0000 0010
E002
-8190
16-bit output
0111 1111 1111 1000
7FF8
32760
|
|
|
0000 0000 0000 0001
0001
1
0000 0000 0000 0000
0000
0
1111 1111 1111 1111
FFFF
-1
|
|
|
1000 0000 0000 1000
8008
-32760
MS1356-E-02
- 29 -
Magnetic flux
density [µT]
4912(max.)
|
0.6
0
-0.6
|
-4912(min.)
4912(max.)
|
0.15
0
-0.15
|
-4912(min.)
2013/10
[AK8963]
8.3.5. ST2: Status 2
Register
name
Read-only register
09H
ST2
Reset
Addr
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
BITM
0
HOFL
0
0
0
0
0
0
0
HOFL: Magnetic sensor overflow
"0":
Normal
"1":
Magnetic sensor overflow occurred
In single measurement mode, continuous measurement mode, external trigger measurement mode and
self-test mode, magnetic sensor may overflow even though measurement data regiseter is not saturated.
In this case, measurement data is not correct and HOFL bit turns to “1”. When next measurement stars, it
returns to “0”. Refer to 6.4.3.6 for detailed information.
BITM: Output bit setting (mirror)
"0":
14-bit output
"1":
16-bit output
Mirror data of BIT bit of CNTL1 register.
ST2 register has a role as data reading end register, also. When any of measurement data register is read in
continuous measurement mode or external trigger measurement mode, it means data reading start and taken
as data reading until ST2 register is read. Therefore, when any of measurement data is read, be sure to read
ST2 register at the end.
8.3.6. CNTL1: Control1
Addr Register name
Write/read register
0AH
CNTL1
Reset
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
BIT
0
MODE3
0
MODE2
0
MODE1
0
MODE0
0
MODE[3:0]: Operation mode setting
"0000": Power-down mode
"0001": Single measurement mode
"0010": Continuous measurement mode 1
"0110": Continuous measurement mode 2
"0100": External trigger measurement mode
"1000": Self-test mode
"1111": Fuse ROM access mode
Other code settings are prohibited
BIT: Output bit setting
"0":
14-bit output
"1":
16-bit output
When each mode is set, AK8963 transits to the set mode. Refer to 6.3 for detailed information.
MS1356-E-02
- 30 -
2013/10
[AK8963]
8.3.7. CNTL2: Control2
Addr Register name
Write/read register
0BH
CNTL2
Reset
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SRST
0
SRST: Soft reset
"0":
Normal
"1":
Reset
When “1” is set, all registers are initialized. After reset, SRST bit turns to “0” automatically.
8.3.8. ASTC: Self Test Control
Addr Register name
Write/read register
0CH
ASTC
Reset
D7
D6
D5
D4
D3
D2
D1
D0
0
SELF
0
0
0
0
0
0
0
SELF: Self test control
"0":
Normal
"1":
Generate magnetic field for self-test
Do not write “1” to any bit other than SELF bit in ASTC register. If “1” is written to any bit other than SELF
bit, normal measurement can not be done.
8.3.9. TS1, TS2: Test 1, 2
Addr Register name
Write/read register
0DH
TS1
0EH
TS2
Reset
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
TS1 and TS2 registers are test registers for shipment test. Do not use these registers.
8.3.10.
I2CDIS: I2C Disable
Addr Register name
D7
D6
D5
D4
D3
D2
D1
D0
Write/read register
0FH
I2CDIS
I2CDIS7 I2CDIS6 I2CDIS5 I2CDIS4 I2CDIS3 I2CDIS2 I2CDIS1 I2CDIS0
Reset
0
0
0
0
0
0
0
0
This register disables I2C bus interface. I2C bus interface is enabled in default. To disable I2C bus interface,
write “00011011” to I2CDIS register. Then I2C bus interface is disabled.
Once I2C bus interface is disabled, it is impossible to write other value to I2CDIS register. To enable I2C bus
interface, reset AK8963 or input start condition 8 times continuously.
MS1356-E-02
- 31 -
2013/10
[AK8963]
8.3.11.
ASAX, ASAY, ASAZ: Sensitivity Adjustment values
Register
name
Read-only register
10H
ASAX
11H
ASAY
12H
ASAZ
Reset
Addr
D7
D6
D5
D4
D3
D2
D1
D0
COEFX7 COEFX6 COEFX5 COEFX4 COEFX3 COEFX2 COEFX1 COEFX0
COEFY7 COEFY6 COEFY5 COEFY4 COEFY3 COEFY2 COEFY1 COEFY0
COEFZ7 COEFZ6 COEFZ5 COEFZ4 COEFZ3 COEFZ2 COEFZ1 COEFZ0
-
Sensitivity adjustment data for each axis is stored to fuse ROM on shipment.
ASAX[7:0]: Magnetic sensor X-axis sensitivity adjustment value
ASAY[7:0]: Magnetic sensor Y-axis sensitivity adjustment value
ASAZ[7:0]: Magnetic sensor Z-axis sensitivity adjustment value
<How to adjust sensitivity>
The sensitivity adjustment is done by the equation below;
 ( ASA − 128) × 0.5 
Hadj = H × 
+ 1 ,
128


where H is the measurement data read out from the measurement data register, ASA is the sensitivity
adjustment value, and Hadj is the adjusted measurement data.
MS1356-E-02
- 32 -
2013/10
[AK8963]
9. Example of Recommended External Connection
9.1.
2
I C Bus Interface
<AK8963C>
VID
POWER 1.65V~Vdd
VDD
POWER 2.4V~3.6V
Slave address select
CAD1 CAD0 address
VSS VSS 0 0 0 1 1 0 0 R/W
VSS VDD 0 0 0 1 1 0 1 R/W
VDD VSS 0 0 0 1 1 1 0 R/W
VDD VDD 0 0 0 1 1 1 1 R/W
Host CPU
Power for i/f
GPIB
RSTN
CAD1
CAD0
AK8963C
VID
TST2
TRG
C
TST1
2
RSV
SDA
/SI
SCL
/SK
CSB
4
3
2
0.1µF
0.1µF
VSS
(Top view)
SO
D
B
VDD
DRDY
A
I C i/f
1
Interrupt
Pins of dot circle should be kept non-connected.
<AK8963N>
Same as AK8963C.
MS1356-E-02
- 33 -
2013/10
[AK8963]
9.2.
4-wire SPI
<AK8963C>
VID
POWER 1.65V~Vdd
VDD
POWER 2.4V~3.6V
Host CPU
Power for i/f
GPIB
RSTN
CAD1
CAD0
AK8963C
VID
TST2
TRG
C
TST1
SPI i/f
RSV
SDA
/SI
SCL
/SK
CSB
4
3
2
0.1µF
0.1µF
VSS
(Top view)
SO
D
B
VDD
DRDY
A
1
Interrupt
Pins of dot circle should be kept non-connected.
<AK8963N>
Same as AK8963C.
MS1356-E-02
- 34 -
2013/10
[AK8963]
10.
Package
10.1. Marking
<AK8963N>
• Company logo: AKM
• Product name: 8963
• Date code:
X1X2X3X4X5
X1
= ID
= Year code
X2
X3X4 = Week code
= Lot
X5
<AK8963C>
• Product name: 8963
• Date code:
X1X2X3X4X5
= ID
X1
X2
= Year code
X3X4 = Week code
X5
= Lot
8963
AKM
8963
X1X2X3X4X5
X1X2X3X4X5
<Top view>
<Top view>
10.2. Pin Assignment
<AK8963C>
D
C
B
A
4
RSTN
VID
SO
SDA/SI
3
2
CAD1
TST1
TRG
RSV
SCL/SK
<Top view>
1
CAD0
VSS
VDD
DRDY
CSB
<AK8963N>
CAD0
CAD1
RSTN
NC
12
11
10
9
8
VID
7
TRG
VDD 15
6
SO
NC 16
5
SDA/SI
VSS 13
AK8963N
<Top view>
TST1 14
4
RSV
CSB
3
SCL/SK
2
DRDY
MS1356-E-02
1
- 35 -
2013/10
[AK8963]
10.3. Outline Dimensions
<AK8963C>
[mm]
1.59±0.03
1.2
4
3
2
1
1
2
3
4
D
1.59±0.03
0.4
1.2
C
B
A
0.4
0.24±0.03
0.40
0.57 max.
0.13
0.05
C
C
<AK8963N>
[mm]
3.00±0.05
B
A
9
13
8
16
5
1.8±0.10
0.45 REF.
9
12
0.25 REF.
8
13
1.8±0.10
3.00±0.05
12
C0.25
16
5
0.35±0.10
1
4
4
0.50 REF.
1
0.25±0.05
16X
0.10 M C A B
0.05 C
MS1356-E-02
0.75±0.05
- 36 -
2013/10
[AK8963]
10.4. Recommended Foot Print Pattern
<AK8963C>
[mm]
<AK8963N>
[mm]
2.25
0.575
0.50
MS1356-E-02
0.30
- 37 -
2013/10
[AK8963]
11.
Relationship between the Magnetic Field and Output Code
The measurement data increases as the magnetic flux density increases in the arrow directions.
<AK8963C>
Z
<AK8963N>
Y
Y
X
896
3
XXX
XX
A KM
896
XXX 3
XX
X
Z
Important Notice
• These products and their specifications are subject to change without notice.
When you consider any use or application of these products, please make inquiries the sales office of
Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the
products.
• AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the
application or use of any information contained herein.
• Any export of these products, or devices or systems containing them, may require an export license or
other official approval under the law and regulations of the country of export pertaining to customs and
tariffs, currency exchange, or strategic materials.
• AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life
support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use,
except for the use approved with the express written consent by Representative Director of AKM. As
used here:
Note1) A critical component is one whose failure to function or perform may reasonably be expected to
result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system
containing it, and which must therefore meet very high standards of performance and reliability.
Note2) A hazard related device or system is one designed or intended for life support or maintenance of
safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to
function or perform may reasonably be expected to result in loss of life or in significant injury or
damage to person or property.
• It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or
otherwise places the product with a third party, to notify such third party in advance of the above content
and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for
and hold AKM harmless from any and all claims arising from the use of said product in the absence of
such notification.
MS1356-E-02
- 38 -
2013/10
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement