AMSCO AS5030-ATSU

AS5030
8-Bit Programmable High Speed Magnetic Rotary Encoder
1 General Description
2 Key Features
360° contactless angular position encoding
The AS5030 is a contactless magnetic rotary encoder for accurate
angular measurement over a full turn of 360°.
It is a system-on-chip, combining integrated Hall elements, analog
front end and digital signal processing in a single device.
Two digital 8-bit absolute outputs:
- Serial interface
- Pulse width modulated (PWM) output
User programmable zero position
To measure the angle, only a simple two-pole magnet, rotating over
the center of the chip is required.
The absolute angle measurement provides instant indication of the
magnet’s angular position with a resolution of 8 bit = 256 positions
per revolution. This digital data is available as a serial bit stream and
as a PWM signal.
Direct measurement of magnetic field strength allows exact
In addition to the angle information, the strength of the magnetic field
is also available as a 6-bit code.
Wide magnetic field input range: 20 ~ 80mT
Data transmission can be configured for 1-wire (PWM), 2-wires
(CLK, DIO) or 3-wires (CLK, DIO, CS).
Small Pb-free package: TSSOP 16
determination of vertical magnet distance
Serial read-out of multiple interconnected AS5030 devices
using daisy chain mode
Wide temperature range: -40°C to +125°C
A software programmable (OTP) zero position simplifies assembly
as the zero position of the magnet does not need to be mechanically
aligned.
3 Applications
The AS5030 is suitable for Contactless rotary position sensing,
Rotary switches (human machine interface), AC/DC motor position
control, Robotics and Encoder for battery operated equipment.
A Power Down Mode together with fast startup- and measurement
cycles allows for very low average power consumption and makes
the AS5030 also suitable for battery operated equipment.
Figure 1. AS5030 Block Diagram
Sin / Sinn / Cos / Cosn
PWM
Decoder
AS5030
Angle
Sin
Cos
Hall Array
&
Front-end
Amplifier
Tracking
ADC &
Angle
Decoder
DX
Zero
Position
Mag
Absolute
Serial
Interface
( SSI )
DIO
CS
CLK
C2
AGC
AGC
Power Management
www.ams.com/AS5030
PWM
MagRngn
OTP
Revision 2.4
PROG
1 - 44
AS5030
Datasheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
1
2 Key Features.............................................................................................................................................................................
1
3 Applications...............................................................................................................................................................................
1
4 Pin Assignments .......................................................................................................................................................................
4
4.1 Pin Descriptions....................................................................................................................................................................................
4
5 Absolute Maximum Ratings ......................................................................................................................................................
5
6 Electrical Characteristics...........................................................................................................................................................
6
6.1 Operating Conditions............................................................................................................................................................................
6
6.2 System Parameters ..............................................................................................................................................................................
6
6.3 Magnet Specifications ..........................................................................................................................................................................
7
6.4 Magnetic Field Alarm Limits .................................................................................................................................................................
7
6.5 Hall Element Sensitivity Options...........................................................................................................................................................
7
6.6 Programming Parameters ....................................................................................................................................................................
8
6.7 DC Characteristics of Digital Inputs and Outputs .................................................................................................................................
8
6.8 8-bit PWM Output .................................................................................................................................................................................
9
6.9 Serial 8-bit Output.................................................................................................................................................................................
9
6.10 General Data Transmission Timings ................................................................................................................................................
10
7 Detailed Description................................................................................................................................................................
11
7.1 Connecting the AS5030......................................................................................................................................................................
11
7.2 Serial 3-Wire R/W Connection............................................................................................................................................................
11
7.3 Serial 3-Wire Read-only Connection ..................................................................................................................................................
13
7.4 Serial 2-Wire Connection (R/W Mode) ...............................................................................................................................................
14
7.5 Serial 2-Wire Continuous Readout .....................................................................................................................................................
15
7.6 Serial 2-Wire Differential SSI Connection...........................................................................................................................................
15
7.7
1-Wire PWM Connection ................................................................................................................................................................
16
7.8 Analog Output.....................................................................................................................................................................................
18
7.9 Analog Sin/Cos Outputs with External Interpolator ............................................................................................................................
19
7.10 3-Wire Daisy Chain Mode.................................................................................................................................................................
20
7.11 2-Wire Daisy Chain Mode.................................................................................................................................................................
8 Application Information ...........................................................................................................................................................
21
22
8.1 AS5030 Programming ........................................................................................................................................................................
23
8.1.1 OTP Programming Options ....................................................................................................................................................... 23
8.1.2 Reduced Power Mode Programming Options ........................................................................................................................... 23
8.2 AS5030 Read / Write Commands ......................................................................................................................................................
8.2.1
8.2.2
8.2.3
8.2.4
16-bit Read Command...............................................................................................................................................................
16-bit Write Command...............................................................................................................................................................
18-bit OTP Read Commands ...................................................................................................................................................
18-bit OTP Write Commands ....................................................................................................................................................
8.3 OTP Programming Connection ..........................................................................................................................................................
23
23
24
24
25
26
8.3.1 Programming in Daisy Chain Mode ........................................................................................................................................... 26
8.4 Programming Verification ...................................................................................................................................................................
www.ams.com/AS5030
Revision 2.4
27
2 - 44
AS5030
Datasheet - C o n t e n t s
8.5 AS5030 Status Indicators ...................................................................................................................................................................
8.5.1
8.5.2
8.5.3
8.5.4
C2 Status Bit..............................................................................................................................................................................
Lock Status Bit...........................................................................................................................................................................
Magnetic Field Strength Indicators ............................................................................................................................................
“Push-button” Feature................................................................................................................................................................
8.6 High Speed Operation ........................................................................................................................................................................
27
27
27
28
28
29
8.6.1 Propagation Delay ..................................................................................................................................................................... 29
8.6.2 Total Propagation Delay of the AS5030 ................................................................................................................................... 30
8.7 Reduced Power Modes ......................................................................................................................................................................
30
8.7.1 Low Power Mode and Ultra-low Power Mode............................................................................................................................ 31
8.7.2 Power Cycling Mode.................................................................................................................................................................. 33
8.8 Accuracy of the Encoder System .......................................................................................................................................................
34
8.8.1 Quantization Error...................................................................................................................................................................... 34
8.8.2 Vertical Distance of the Magnet................................................................................................................................................. 35
8.9 Choosing the Proper Magnet..............................................................................................................................................................
36
8.9.1 Magnet Placement..................................................................................................................................................................... 37
8.9.2 Lateral Displacement of the Magnet .......................................................................................................................................... 38
8.9.3 Magnet Size............................................................................................................................................................................... 39
8.10 Physical Placement of the Magnet ...................................................................................................................................................
9 Package Drawings and Markings ...........................................................................................................................................
9.1 Recommended PCB Footprint............................................................................................................................................................
10 Ordering Information.............................................................................................................................................................
www.ams.com/AS5030
Revision 2.4
40
41
42
43
3 - 44
AS5030
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
1
16
PWM
PROG
2
15
C2
14
C1
A S5030
MagRngn
VSS
3
test3
4
test2
5
test1
6
test0
7
10
TC
8
9
13
VDD
12
DIO
11
CS
CLK
DX
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
Pin Type
1
MagRngn
Digital output / tri-state
2
PROG
3
VSS
4
T3_SINn
-
This pin is used for factory testing. For normal operation it must be left
unconnected. Inverse SIN (Sinn) output in SIN/COS output mode
5
T2_SIN
-
This pin is used for factory testing. For normal operation it must be left
unconnected. SIN output in SIN/COS mode
6
T1_COSn
-
This pin is used for factory testing. For normal operation it must be left
unconnected. Inverse COS (Cosn) output in SIN/COS mode
7
T0_COS
-
This pin is used for factory testing. For normal operation it must be left
unconnected. COS output in SIN/COS mode
8
TC
-
Test pin. Connect to VSS or leave unconnected
9
DX
Digital output
10
CLK
11
CS
12
DIO
13
VDD
14
C1
15
C2
16
PWM
www.ams.com/AS5030
Description
Push-Pull output. Is ‘HIGH’ when the magnetic field strength is too
weak, e.g. due to missing magnet
Programming voltage input. Must be left open in normal operation.
Maximum load = 20pF (except during programming)
Supply pin
Supply ground
Digital output for 2-wire operation and Daisy Chain mode
Clock Input of Synchronous Serial Interface; Schmitt-Trigger input
Digital input /
Schmitt-Trigger
Chip Select for serial data transmission, active high; Schmitt-Trigger
input, external pull-down resistor (~50kΩ) required in read-only mode
Bi-directional digital pin Data output / command input for digital serial interface
Positive supply voltage, 4.5V to 5.5V
Supply pin
Digital input
(standard CMOS; no
pull-up or pull-down)
Digital output
Configuration input: Connect to VSS for normal operation,
connect to VDD to enable SIN-COS outputs. This pin is scanned at
power-on-reset and at wake-up from one of the Ultra-low Power Modes
Configuration input: Connect to VSS for 3-wire operation,
connect to VDD for 2-wire operation. This pin is scanned at power-onreset and at wake-up from one of the Ultra-low Power Modes
Pulse Width Modulation output, 2µs pulse width per step
(2µs ~ 512µs)
Revision 2.4
4 - 44
AS5030
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 6 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
VDD
Supply voltage
-0.3
7
V
Except during OTP programming
VIN
Input pin voltage
Iscr
Input current (latch-up immunity)
Electrical Parameters
VSS - 0.5 VDD + 0.5
-100
100
V
mA
Norm: Jedec 78
kV
Norm: MIL 883 E method 3015
137
°C/W
Still Air / Single Layer PCB
89
°C/W
Still Air / Multilayer PCB
+150
°C
Min -67ºF; Max +257ºF
260
°C
The reflow peak soldering temperature
(body temperature) specified is in
accordance with IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification
for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages
is matte tin (100% Sn).
85
%
Electrostatic Discharge
ESD
Electrostatic Discharge
ΘJA
Package thermal resistance
±2
Temperature Ranges and Storage Conditions
Tstrg
TBODY
Storage temperature
Body temperature
Humidity non-condensing
MSL
www.ams.com/AS5030
-55
Moisture Sensitive Level
5
3
Revision 2.4
Represents a maximum floor time of 168h
5 - 44
AS5030
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
TAMB = -40°C to +125°C, VDD5V = 4.5V ~ 5.5V, all voltages referenced to VSS, unless otherwise noted.
6.1 Operating Conditions
Symbol
Parameter
VDD
Positive supply voltage
IDD
Operating current
Ioff
Power-down current
TAMB
Ambient temperature
Conditions
Min
Typ
4.5
Max
Units
5.5
V
No load on outputs.
Minimum AGC (strong magnetic field)
14
18
No load on outputs.
Maximum AGC (weak or no magnetic field)
18
22
Low Power Mode
1400
2000
Ultra-low Power Mode
30
120
mA
-40°F ~ +257°F
-40
Conditions
Min
µA
125
°C
Max
Units
6.2 System Parameters
Symbol
Parameter
N
Resolution
TPwrUp
Power up time
Typ
8
bit
1.406
°
Startup from zero; AGC not regulated
1000
Startup from zero until regulated AGC
3300
Startup from Power Down Mode
500
Startup from Low Power Mode
Setting 1: no hysteresis, no reset
46
Setting 2: hysteresis and reset
1500
tda
Propagation delay
Analog signal path;
over full temperature range
tdd
Tracking rate
step rate of tracking ADC;
1 step = 1.406°
tdelay
Signal processing delay
Total signal processing delay,
analog + digital (tda + tdd)
T
Analog filter time constant
Internal low-pass filter
4.1
centered magnet
-2
2
INLcm
Accuracy
within horizontal displacement radius
(see Magnet Specifications on page 7)
-3
3
TN
Transition noise
rms (1 sigma)
PORr
PORf
Hyst
www.ams.com/AS5030
Power-on-reset levels
0.85
μs
15
17
µs
1.15
1.45
µs
16.15
18.45
µs
6.6
12.5
µs
°
0.235
°
VDD rising
3.5
4.5
V
VDD falling
3.0
4.5
V
Hysteresis | PORr - PORf |
Revision 2.4
500
mV
6 - 44
AS5030
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.3 Magnet Specifications
Recommended magnet: NdFeB 35H BR = 12.000 Gauss, Ø6mm x 2.5mm
Symbol
Parameter
Conditions
MD
Magnet diameter
Diametrically magnetized
MT
Magnet thickness
Bi
Magnetic input range
At chip surface, on a radius of 1mm
vi
Magnet rotation speed
To maintain locked state
Bmax
Magnetic field high detection
TAMB=25°C, AGC @ lower limit,
1 sigma = 2.5mT
52
Bmin
Magnetic field low detection
TAMB=25°C, AGC @ upper limit,
1 sigma = 1.5mT
23
Hall array radius
Over x/y chip center
1
Vertical distance of magnet
Recommended distance; operation outside
this range is possible, accuracy may be
reduced
Horizontal magnet displacement radius
tkM
Recommended magnet material and
temperature drift
Min
Typ
Max
Units
6
mm
2.5
mm
20
80
mT
30.000
rpm
mT
0.5
1
mm
1.8
From diagonal package center
0.25
From diagonal IC center
0.5
NdFeB Material
-0.12
SmCo Material
-0.035
mm
mm
%/K
6.4 Magnetic Field Alarm Limits
Symbol
Parameter
Conditions
Min
AGCFF
Magnetic field too low alarm limit
AGC = FFH
untrimmed, 25°C, 1sigma
AGC0
Magnetic field too high alarm limit
Typ
Max
Units
20.3
23.6
mT
AGC = 0H
untrimmed, 25°C, 1sigma
44.5
52.2
mT
Magnetic field alarm limit trim range
(see Hall Element Sensitivity Options on
page 7)
100
121
%
Temperature coefficient of alarm ranges
Sensitivity increases with temperature which
partly compensates the temperature
coefficient of the magnet
0.052
%/K
6.5 Hall Element Sensitivity Options
Symbol
sens
Parameter
Hall element sensitivity setting
www.ams.com/AS5030
Conditions
Min
Typ
sens = 00 (default); low sensitivity
(see 18-bit OTP Write Commands on page
25)
100
sens = 01
106
sens = 10
113
sens = 11 (high sensitivity)
121
Revision 2.4
Max
Units
%
7 - 44
AS5030
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.6 Programming Parameters
Symbol
Parameter
Conditions
Min
VPROG
Programming voltage
Static voltage at pin PROG
8.0
IPROG
Programming current
TambPROG
Programming ambient temperature
During programming
tPROG
Programming time
Timing is internally generated
Analog readback voltage
During Analog Readback mode at pin PROG
VR,prog
VR,unprog
Typ
Max
Units
8.5
V
100
mA
0
85
°C
2
4
µs
0.5
2.2
3.5
V
6.7 DC Characteristics of Digital Inputs and Outputs
CMOS Inputs: CLK, CS, DIO, C1, C2
Symbol
Parameter
VIH
High level input voltage
Conditions
Min
Typ
Max
VIL
Low level input voltage
0.3*VDD
V
ILEAK
Input leakage current
1
µA
Max
Units
0.7*VDD
Units
V
CMOS Outputs: DIO, MagRngn, PWM, DX
Symbol
Parameter
Conditions
Min
VOH
High level output voltage
Source current <4mA
VDD-0.5
VOH
Low level output voltage
Sink current <4mA
CL
Capacitive load
Typ
V
0.4
V
35
pF
Max
Units
1
µA
CMOS Tristate Output: DIO
Symbol
Parameter
Conditions
IOZ
Tristate leakage current
CS = low
www.ams.com/AS5030
Revision 2.4
Min
Typ
8 - 44
AS5030
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.8 8-bit PWM Output
Symbol
Parameter
NPWM
PWM resolution
Conditions
PWMIN
PWM pulse width
Angle = 0° (00H)
PWMAX
PWM pulse width
Angle = 358.6° (FFH)
PWP
PWM period
fPWM
PWM frequency
Hyst
Min
1
Over full temperature range
2
Digital hysteresis
Typ
Max
Units
8
bit
2
µs/step
1.66
2.26
2.85
µs
427
578
731
µs
428
581
734
µs
1 / PWM period
1.72
kHz
At change of rotation direction
1
bit
1. The tolerance of the absolute PWM pulse width and frequency can be eliminated by using the duty cycle tON/(tON+tOFF) for angle
measurement(see 1-Wire PWM Connection on page 16).
2. Hysteresis may be temporarily disabled by software(see 16-bit Write Command on page 24).
6.9 Serial 8-bit Output
3-wire Interface.
Symbol
Parameter
Conditions
Clock frequency
Normal operation
Clock frequency
During OTP programming
250
Parameter
Conditions
Min
Clock frequency
Normal operation
fclk,P
Clock frequency
tTO
Synchronization timeout
Hyst
Digital hysteresis
fCLK
tCLK
fclk,P
Min
Typ
Max
Units
6
MHz
166.6
ns
500
kHz
Max
Units
0.1
6
MHz
166.6
10,000
ns
During OTP programming
250
500
kHz
Rising edge of CLK to internally generated
chip select on pin DX
16.6
34.3
ms
2-wire Interface.
Symbol
fCLK
tCLK
1
At change of rotation direction
Typ
27
1
bit
1. Hysteresis may be temporarily disabled by software.
www.ams.com/AS5030
Revision 2.4
9 - 44
AS5030
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.10 General Data Transmission Timings
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t0
Rising CLK to CS
CLK/2
+0
CLK/2
+50
ns
t1
Chip select to positive edge of CLK
50
ns
t2
Chip select to drive bus externally
0
ns
t3
Setup time command bit data valid to
positive edge of CLK
50
ns
t4
Hold time command bit data valid after
positive edge of CLK
15
ns
t5
Float time positive edge of CLK for last
command bit to bus float
t6
Bus driving time positive edge of CLK for
last command bit to bus drive
CLK/2
+0
t7
Setup time data bit data valid to positive
edge of CLK
CLK/2
+0
t8
Hold time data bit data valid after positive
edge of CLK
CLK/2
+0
ns
t9
Hold time chip select positive edge CLK to
negative edge of chip select
CLK/2
+50
ns
t10
Bus floating time negative edge of chip
select to float bus
t11
Hold time data bit @ write access
data valid to positive edge of CLK
50
ns
t12
Hold time data bit @ write access
data valid after positive edge of CLK
15
ns
t13
Bus floating time negative edge of chip
select to float bus
tTO
Timeout period in 2-wire mode
(from rising edge of CLK)
CLK/2 +0
ns
CLK/2
+30
50
20
ns
ns
ns
50
ns
24
µs
See Figure 5 for the corresponding timing diagram.
www.ams.com/AS5030
Revision 2.4
10 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7 Detailed Description
The benefits of AS5030 are as follows:
Complete system-on-chip, no calibration required
Flexible system solution provides absolute serial and PWM output
Ideal for applications in harsh environments due to magnetic sensing principle
High reliability due to non-contact sensing
Robust system, tolerant to horizontal misalignment, airgap variations, temperature variations and external magnetic fields
Figure 3. Typical Arrangement of AS5030 and Magnet
7.1 Connecting the AS5030
The following examples show various ways to connect the AS5030 to an external controller:
7.2 Serial 3-Wire R/W Connection
In this mode, the AS5030 is connected to the external controller via three signals:
Chip Select (CS), Clock (CLK) inputs and bi-directional DIO (Data In/Out) output.
The controller sends commands over the DIO pin at the beginning of each data transmission sequence, such as reading the angle or putting the
AS5030 in and out of the reduced power modes.
A pull-down resistor is not required.
C1 and C2 are hardware configuration inputs. C1 must always be connected to VSS, C2 selects 3-wire mode (C2 = low) or 2-wire mode (C2 =
high)
www.ams.com/AS5030
Revision 2.4
11 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 4. SSI Read/Write Serial Data Transmission
+5 V
VDD
13
VDD
VDD
11
Output
Micro
10
Output
Controller
CS
CLK
12
I/O
AS5030
100 n
DI O
VSS
C1
14
C2
VSS
15
3
VSS
Figure 5. Timing Diagram in 3-wire SSI R/W Mode
command phase
data phase
t CLK
CLK
1
2
3
4
5
6
20
7
21
t1
t9
CS
t5
DIO
CMD 3
CMD4
t3
DIO
t4
CMD 0
t6
t7
DIO read
t8
D 15
t 10
D1
D 14
DIO write
D0
Table 3. Serial Bit Sequence (16-bit read/write)
Write Command
C4
C3
C2
C1
www.ams.com/AS5030
Read / Write Data
C0
D15 D14 D13 D12
D11
D10
D9
Revision 2.4
D8
D7
D6
D5
D4
D3
D2
D1
D0
12 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.3 Serial 3-Wire Read-only Connection
If the AS5030 is only used to provide the angular data (no power down or OTP access) this simplified connection is possible. The Chip Select
(CS) and Clock (CLK) connection is the same as in the R/W mode, but only a digital input pin (not an I/O pin) is required for the DIO connection.
As the first 5 bits of the data transmission are command bits sent to the AS5030, both the microcontroller and the AS5030 are configured as
digital inputs during this phase. Therefore, a pull-down resistor must be added to make sure that the AS5030 reads “00000” as the first 5 bits
which sets the Read_Angle command.
All further application examples are shown in R/W mode, however read-only mode is also possible, unless otherwise noted.
Figure 6. SSI Read-only Serial Data Transmission
+5 V
VDD
13
VDD
VDD
11
Output
Micro
Controller
10
Output
12
Input
CS
CLK
AS5030
10 k ...
100 k
VSS
100 n
DI O
C1
14
C2
VSS
3
15
VSS
Figure 7. Timing Diagram in 2-wire and 3-wire SSI Mode
command phase
CLK
1
2
data phase
3
4
5
6
7
8
20
21
t1
t9
CS
DIO
DIO read
t 10
DIO
D 15
D 14
D 13
D 12
D1
DIO write
D0
Table 4. Serial Bit Sequence (16-bit read/write)
Read
D20 D19 D18 D17 D16 D15 D14 D13 D12
0
0
0
www.ams.com/AS5030
0
0
C2
lock
D11
D10
D9
D8
D7
D6
D5
AGC
D5
D4
D3
D2
D4
D3
D2
D1
D0
D2
D1
D0
Angle
D1
Revision 2.4
D0
D7
D6
D5
D4
D3
13 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.4 Serial 2-Wire Connection (R/W Mode)
By connecting the configuration input C2 to VDD, the AS5030 is configured to 2-wire data transmission mode.
Only Clock (CLK) and Data (DIO) signals are required. A Chip Select (CS) signal is automatically generated by the DX output, when a time-out
of CLK occurs (typ. 20µs).
Note: Read-only mode is also possible in this configuration.
Figure 8. SSI R/W Mode 2-wire Data Transmission
+5 V
VDD
15
VDD
9
DX
11
CLK
12
I/O
VDD
CS
10
Output
Micro
Controller
13
C2
AS5030
100n
DI O
VSS
C1
VSS
14
3
VSS
Figure 9. Timing Diagram in 2-wire SSI Mode
command phase
CLK
1
t0
2
3
4
data phase
5
6
7
wait cycle
(> 500 ns)
8
22
t1
DX
CS
DIO read
DIO write
www.ams.com/AS5030
t5
CMD4
CMD 3
CMD2
CMD 0
CMD 1
t6
D 15
Revision 2.4
D 14
D0
14 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.5 Serial 2-Wire Continuous Readout
nd
The termination of each readout sequence by a timeout of CLK after the 22 clock pulse as described in Serial 2-Wire Connection (R/W Mode)
is the safest method to ensure synchronization, as each timeout of CLK resets the serial interface.
However, it is not mandatory to apply a timeout of CLK and consequently synchronization after each reading. It is also possible to read several
nd
rd
consecutive angle values without synchronization by simply continuing the CLK pulses without timeout after the 22 clock. The 23 clock is
st
equal to the 1 clock of the next measurement, etc.
This is the fastest way to read multiple angle values, as there is no timeout period between the readings. It is still possible to synchronize the
th
serial data transmission by a timeout of CLK after a given number of readouts (e.g. synchronize after every 5 reading, etc.)
Figure 10. Timing Diagram in 2-wire SSI Continuous Readout
command phase
CLK
1
t0
2
3
data phase
4
5
6
7
command phase
8
22
23
24
25
t1
DX
CS
t5
DIO read
CMD4
CMD 3
CMD 0
CMD 1
CMD2
CMD 4
CMD 3
CMD2
t6
DIO write
D 14
D 15
D0
1st reading
2nd reading
7.6 Serial 2-Wire Differential SSI Connection
With the addition of a RS-422 / RS-485 transceiver, a fully differential data transmission, according to the 21-bit SSI interface standard is
possible. To be compatible with this standard, the CLK signal must be inverted. This is done by reversing the Data+ and Data- lines of the
transceivers.
Note: This type of transmission is read-only.
Figure 11. 2-wire SSI Read-only Mode
+5 V
VDD
15
9
VDD
11
Micro
Controller
Output
CLK
D+
D-
D-
D+
10
C2
DX
13
VDD
CS
CLK
AS5030
100n
MAX 3081 or similar
VSS
Input DI
D+
D+
D-
D-
12
DIO
C1
14
VSS
3
VSS
www.ams.com/AS5030
Revision 2.4
15 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 12. Timing Diagram in 2-wire Read only Mode (differential transmission)
CLK
1
2
3
4
5
6
7
8
20
21
timeout
tTO
DI
D 15
D 14
D1
D0
Table 5. SSI Read-only Serial Bit Sequence (21bit read)
Read
D20 D19 D18 D17 D16 D15 D14 D13 D12
0
0
0
0
0
C2
lock
D11
D10
D9
D8
D7
D6
D5
AGC
D5
D4
D3
D2
D4
D3
D2
D1
D0
D2
D1
D0
Angle
D1
D0
D7
D6
D5
D4
D3
7.7 1-Wire PWM Connection
This configuration uses the least number of wires: only one line (PWM) is used for data, leaving the total number of connection to three, including
the supply lines. This type of configuration is especially useful for remote sensors.
Ultra-low Power Mode is not possible in this configuration, as there is no bi-directional data transmission.
If the AS5030 angular data is invalid, the PWM output will remain at low state. Pins that are not shown may be left open.
Note that the PWM output is invalid when the AGC is disabled.
Figure 13. Data Transmission with Pulse Width Modulated (PWM) Output
+5 V
VDD
11
VDD
13
VDD
CS
Micro
Controller
AS5030
Input
16
100 n
PWM
VSS
C1
14
C2
15
VSS
3
VSS
www.ams.com/AS5030
Revision 2.4
16 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
The minimum PWM pulse width tON (PWM = high) is 1 LSB @ 0° (Angle reading = 00H).
1LSB = nom. 2.26µs.
The PWM pulse width increases with 1LSB per step. At the maximum angle 358.6° (Angle reading = FFH),
the pulse width tON (PWM = high) is 256 LSB and the pause width tOFF (PWM = low) is 1 LSB.
This leads to a total period (tON + tOFF) of 257LSB.
PWM out
2. 26 µs
5V
0V
291. 54 µs
578 . 56 µs
578. 56 µs
ton
2. 26 µs
toff
287. 02 µs
Position
255
128
0
Table 6. SSI Read-only Serial Bit Sequence (21-bit read)
Position
Angle
High
t_high
Low
t_low
Duty-Cycle
0
0°
1
2.26µs
256
578.56µs
0.39%
127
178.59
128
287.02µs
129
291.54µs
49.4%
128
180°
129
291.54µs
128
287.02µs
50.2%
255
358.59°
256
578.56µs
1
2.26µs
99.6%
This means that the PWM pulse width is (position + 1) LSB, where position is 0….255.
The tolerance of the absolute pulse width and -frequency can be eliminated by calculating the angle with the duty cycle rather than with the
absolute pulse width:
(EQ 1)

tON
angle[8 − bit ] =  257
tON + tOFF


 − 1

results in an 8-bit value from 00H to FFH,
(EQ 2)
angle[°] =
360 
tON
 257
256 
tON + tOFF
 
 − 1
 
results in a degree value from 0° ~ 358.6°
Note: The absolute frequency tolerance is eliminated by dividing tON by (tON+TOFF), as the change of the absolute timing effects both TON
and TOFF in the same way.
www.ams.com/AS5030
Revision 2.4
17 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.8 Analog Output
This configuration is similar to the PWM connection (only three lines including supply are required). With the addition of a low-pass filter at the
PWM output, this configuration produces an analog voltage that is proportional to the angle.
This filter can be either passive (as shown) or active. The lower the bandwidth of the filter, the less ripple of the analog output can be achieved.
If the AS5030 angular data is invalid, the PWM output will remain at low state and thus the analog output will be 0V. Pins that are not shown may
be left open.
Note: The PWM output is invalid when the AGC is disabled.
Figure 14. Data Transmission with Pulse Width Modulated (PWM) Output
+5 V
VDD
11
13
VDD
CS
AS5030
100n
PWM
C2
C1
14
15
VSS
16
>=4k7
>=1µF
>=4k7
Analog
out
>=1µF
3
VSS
Figure 15. Relation of PWM/Analog Output With Angle
5V
Analog out
0V
PWMout
0°
www.ams.com/AS5030
360°
180°
Revision 2.4
Angle
18 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.9 Analog Sin/Cos Outputs with External Interpolator
By connecting C1 to VDD, the AS5030 provides analog Sine and Cosine outputs (Sin, Cos) of the Hall array front-end for test purposes. These
outputs allow the user to perform the angle calculation by an external ADC + µC, e.g. to compute the angle with a high resolution.
In addition, the inverted Sine and Cosine signals (Sinn, Cosn; see dotted lines) are available for differential signal transmission.
The input resistance of the receiving amplifier or ADC should be greater than 100kΩ. The signal lines should be kept as short as possible, longer
lines should be shielded in order to achieve best noise performance.
The SIN / COS / SINn / COSn signals are amplitude controlled to ~1.3Vp (differential) by the internal AGC controller. The DC bias voltage is
2.25V.
If the SIN(n)- and COS(n)- outputs cannot be sampled simultaneously, it is recommended to disable the automatic gain control as the signal
amplitudes may be changing between two readings of the external ADC. This may lead to less accurate results.
Figure 16. Sine and Cosine Outputs for External Angle Calculation
+5 V
VDD
14
C1
VDD
5
D
A
Micro
Controller
4
7
D A
6
13
VDD
Sin
Sinn
AS5030
Cos
100n
Cosn
C2
15
VSS
VSS
3
VSS
www.ams.com/AS5030
Revision 2.4
19 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.10 3-Wire Daisy Chain Mode
The Daisy Chain mode allows connection of more than one AS5030 to the same controller interface. Independent of the number of connected
devices, the interface to the controller remains the same with only three signals: CSn, CLK and DO. In Daisy Chain mode, the data from the
second and subsequent devices is appended to the data of the first device.
The 100nF buffer cap at the supply (shown only for the last device) is recommended for all devices.
The total number of serial bits is: n*21, where n is the number of connected devices: e.g. for 2 devices, the serial bit stream is 42bits. For three
devices it is 63 bits.
Figure 17. Connection of Devices in 3-wire Daisy Chain Mode
+5 V
VDD
VDD
Micro
Controller
AS5030
AS5030
CS
10
Output
13
VDD
#1
11
Output
13
VDD
11
DX
10
CLK
12
AS5030
#2
(last device)
11
DX
CS
CLK
DX
CS
10
12
100n
CLK
12
DI O
C1 C2 VSS
14 15
3
DI O
C1 C2 VSS
14 15
3
I/O
VSS
13
VDD
DIO
C1 C2 VSS
14 15
3
VSS
Figure 18. Timing Diagram in 3-wire Daisy Chain Mode
CLK
1
2
3
4
5
6
7
8
20
21
22
23
24
25
26
27
28
29
41
42
43
44
CS
DIO
CMD 4 CMD 3 CMD 2 CMD 1 CMD 0
D 15
D 14
D 13
D0
CMD 4 CMD 3 CMD 2 CMD 1 CMD 0
AS5030 # 1
www.ams.com/AS5030
D 15
AS5030 # 2
Revision 2.4
D 14
D 13
D0
CMD 4 CMD 3 CMD 2
AS5030 # 3
20 - 44
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.11 2-Wire Daisy Chain Mode
The AS5030 can also be connected in 2-wire Daisy Chain mode, requiring only two signals (Clock and Data) for any given number of daisychained devices. Note that the connection of all devices except the last device is the same as for the 3-wire connection (see Figure 17). The last
device must have pin C2 (#15) set to ‘high’ and feeds the DX signal to CS of the first device.
Again, each device should be buffered with a 100nF cap (shown only for the last device).
The total number of serial bits is: n*21, where n is the number of connected devices. Note that this configuration requires one extra clock (#1) to
initiate the generation of the CS signal for the first device. After reading the last device, the communication must be reset back to the first device
by introducing a timeout of CLK (no rising edge for >24µs)
Figure 19. 2-wire Daisy Chain Mode
+5 V
VDD
VDD
Micro
Controller
11
13
13
13
VDD
VDD
VDD
AS5030
AS5030
#1
CS
11
10
Output
12
I/O
VSS
10
CLK
DI O
C1 C2
14 15
AS5030
12
VSS
3
11
DX
CS
10
CLK
12
DI O
C1 C2
14 15
C2
(last device)
#2
DX
15
VSS
3
CS
DX
100n
CLK
DI O
C1
14
VSS
3
VSS
Figure 20. Timing Diagram in 2-wire Daisy Chain Mode
CLK
1
2
3
4
5
6
CMD 2
CMD 1
CMD 0
7
8
21
22
23
24
25
26
27
CMD 4
CMD 3
CMD 2
CMD 1
CMD 0
28
29
42
43
44
45
CMD 4
CMD 3
CS (#1)
CS (#2)
CS (#3)
DIO
CMD 4
CMD 3
D 15
D 14
D0
AS 5030 # 1
www.ams.com/AS5030
D 15
AS5030 # 2
Revision 2.4
D 14
D0
CMD 2
AS5030 # 3
21 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8 Application Information
AS5030 Parameter and Features List.
Parameter
Description
Supply voltage
5V ± 10%
Supply current
Low Power Mode, non-operational: typ. 1.4mA
Ultra-low Power Mode, non-operational: typ. 30µA
Normal operating mode: typ. 14mA.
Absolute output; Serial Interface
SSI clock rate
21-bit Synchronous Serial Interface (SSI): 5 command bits, 2 data valid bits, 6 data bits for magnetic
field strength, 8 data bits for angle.
Configurable for 2-wire (Clock, Data) or 3-wire (Chip Select, Clock, Data) operation
Daisy Chain mode for reading multiple encoders through a 2- or 3-wire interface.
Zero Position Programming (OTP)
≤ 6 MHz data clock rate, 250 ~ 500kHz during programming
2-wire readout mode
DIO and CLK signals. 0.1 ~ 6MHz clock rate. Synchronization through time-out of CLK signal.
Power down modes
Activated and deactivated by software commands.
Low Power Mode: power down current = 1.4mA typ.; power up time <150µs
Ultra-low Power Mode: power down current = 30µA typ.; power up time <500µs
Digital input cells
CLK, CS = Schmitt trigger inputs
SIN-COS mode
Sine, inverse Sine, Cosine and inverse Cosine outputs. 360° per period.
Maximum speed
30.000 rpm with locked ADC
Resolution and accuracy
Transition noise
PWM output
Digital output current
OTP programming mode
Magnetic field range
Resolution = 8-bit (1.406°)
Accuracy ≤ ± 2° with centered magnet
0.24°rms (1 sigma)
2.26µs / Step, PWM will be permanently low when angular data is not valid (e.g. during startup).
4mA @ VDD = 5V (PWM, DIO, DX, MagRngn outputs)
Through serial interface with static programming voltage on pin #2 (PROG)
16-bit OTP programming register. OTP user programming options:
Angular zero position: 8 bit
Hall element sensitivity: 2 bit
Trimmable in four steps with OTP programming (sensitivity)
maximum/minimum ratio ~ 2.5:1. Field range window = 20 ~ 80mT
(e.g. maximum sensitivity range = 20 ~ 48mT, minimum sensitivity range = 32 ~ 80mT
Non-valid-range indication
By hardware: MagRngn pin indicates locked condition of ADC
By software: LOCK1&2 status bits indicate locked condition of ADC
Start-up timings
Start-up time after shutdown < 2ms
Start-up time after power-down from Ultra-low Power Mode: < 500µs
Start-up time after power-down from Low Power Mode: < 150µs
ESD protection
± 2kV
Operating temperature
www.ams.com/AS5030
-40°C ~ +125°C
Revision 2.4
22 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.1 AS5030 Programming
The AS5030 has an integrated 18-Bit OTP ROM for configuration purposes.
8.1.1
OTP Programming Options
The OTP programming options can be set permanently by programming or temporarily by overwriting. Both methods are carried out over the
serial interface, but with different commands (WRITE OTP, PROG OTP).
Note: During the 18bit OTP programming, each bit needs 4 clock pulses to be validated.
Zero Position
Programming
This programming option allows the user to program any rotation angle of the magnet as the new zero position. This useful feature simplifies the assembly process as the magnet does not need to be mechanically adjusted to the electrical zero position. It can be assembled in
any rotation angle and later matched to the mechanical zero position by zero position programming.
The 8-bit user programmable zero position can be applied both temporarily (command WRITE OTP, #1FH) or permanently (command
PROG OTP, #19H)
Magnetic Field Optimization
This programming option allows the user to match the vertical distance of the magnet with the optimum magnetic field range of the AS5030
by setting the sensitivity level.
The 2-bit user programmable sensitivity setting can be applied both temporarily (command WRITE OTP, #1FH) or permanently (command
PROG OTP, #19H)
8.1.2
Reduced Power Mode Programming Options
These temporary programming options are also carried out over the serial interface.
Low Power Mode
Low Power Mode is a power saving mode with fast start-up. In Low Power Mode, all internal digital registers are frozen and the power consumption is reduced to max. 1.5mA. The serial interface remains active. Start-up from this mode to normal operation can be accomplished
within 150µs. This mode is recommended for applications, where low power, but fast start-up and short reading cycle intervals are required.
Ultra-low Power Mode
Ultra-low Power Mode is a power saving mode with even reduced power-down current consumption. In this mode, all chip functions are frozen and the power consumption is reduced to max. 50µA. The serial interface remains active. Start-up from this mode to normal operation
can be accomplished within 500µs. This mode is recommended for applications, where very low average power consumption is required,
e.g. for battery operated equipment. For example, in a cycled operation with 10 readings per second, the average power consumption of the
AS5030 can be reduced to only 120µA.
8.2 AS5030 Read / Write Commands
Data transmission with the AS5030 is handled over the 2-wire or 3-wire interface. The transmission protocol begins with sending a 5-bit
command to the AS5030, followed by reading or writing 16 or 18 bits of data:
8.2.1
16-bit Read Command
Command
Bin
Hex
D15
D14
RD
ANGLE
00000
00
C2
lock
D13 D12
D11
D10
D9
D8
D7
AGC 5:0
D6
D5
D4
D3
D2
D1
D0
Angle 7:0
C2 displays status of hardware pin C2 (pin #15)
Lock indicates that the AGC is locked. Data is invalid when this bit is 0
AGC 6-bit AGC register. Indicates the strength of the magnet (e.g. for push-button applications)
000000b indicates a strong magnetic field
111111b indicates a weak magnetic field
ideally, the vertical distance of the magnet should be chosen such that the AGC value is in the middle (around 100000b)
Angle 8-bit Angle value; represents the rotation angle of the magnet. One step = 360°/256 = 1.4°
www.ams.com/AS5030
Revision 2.4
23 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.2.2
16-bit Write Command
These settings are temporary; they cannot be programmed permanently. The settings will be lost when the power supply is removed.
Command
Bin
Hex
D15
D14
EN PROG
10000
10
1
0
SET PWR
MODE
10001
11
ULP/
LPn
PSM
DIS HYST
10011
13
HYS
DIS AGC
10101
15
0
D13 D12
0
0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
0
1
0
1
0
1
1
1
0
0
0
0
0
0
0
rst
0
0
0
AGC 5:0
FA
EN PROG command must be sent with a fixed 16-bit code (8CAEH) to enable subsequent OTP access.
ULP/LPn selects the Ultra-low Power Mode, when bit PSM is set: 0 = Low Power Mode, 1 = Ultra-low Power Mode
PSM enables power saving modes: 0 = normal operation, 1 = reduced power mode selected by bit ULP/LPn
HYS disables the hysteresis of the digital serial and PWM outputs:
0 (default) = 1-bit hysteresis, 1 = no hysteresis
DIS AGC disables the automatic gain control. The AGC will be frozen to a gain setting written in bits AGC 5:0 (D6:D1), bit FA must be set.
rst General Reset: 0 = normal operation, 1 = perform general reset (required after return from reduced power modes)
FA Freeze AGC; 0 = normal operation, 1= freeze AGC with the values stored in bits AGC 5:0. The PWM output will be invalid when bit FA is set.
8.2.3
18-bit OTP Read Commands
Note: To prohibit unintentional access to the OTP register, OTP PROG/write access is only enabled after the EN PROG command has been
sent. OTP access is locked again by sending a RD ANGLE or SET PWR MODE command.
EN PROG need not to be sent before a READ OTP.
During the 18bit OTP read/write transfer, each bit needs 4 clock pulses to be validated.
Command
Bin
READ OTP 01111
ANALOG
OTP RD
01001
Hex
D17
D16
D15
D14 D13 D12 D11 D10 D9 D8
D7
D6
D5
D4
D3
0F
reserved for factory settings
sens
1:0
zero position
7:0
09
reserved for factory settings
sens
1:0
zero position
7:0
D2
D1
D0
READ OTP reads the contents of the OTP register in digital form. The reserved area may contain any value
ANALOG OTP RD reads the contents of the OTP register as an analog voltage at pin PROG
sens reads the sensitivity setting of the Hall elements: 00 = low sensitivity, 11 = high sensitivity
zero position reads the programmed zero position; the actual angle of the magnet which is displayed as 000
www.ams.com/AS5030
Revision 2.4
24 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.2.4
18-bit OTP Write Commands
During the 18bit OTP read/write transfer, each bit needs 4 clock pulses to be validated.
Command
Bin
Hex
D17
D16
D15
D14 D13 D12 D11 D10 D9 D8
D7
D6
D5
D4
D3
D2
WRITE
OTP
11111
1F
copy factory settings
obtained from READ OTP command
sens
1:0
zero position
7:0
PROG OTP 11001
19
00000000
reserved for factory settings,
sens
1:0
zero position
7:0
D1
D0
WRITE OTP: non-permanent (“soft write”) modification of the OTP register. To set the reserved factory settings area properly, a preceding READ
OTP command must be made to receive the correct setting for bits D17:D10. The WRITE OTP command must then set these bits in exactly the
same way. Improper setting of the factory settings by a WRITE OTP command may cause malfunction of the chip. The OTP register, including
the factory settings can be restored to default by a power-up cycle.
For non-permanent writing, a programming voltage at pin PROG (#2) is not required. EN_PROG must be sent before WRITE_OTP to enable
OTP.
PROG OTP: permanent modification of the OTP register. An unprogrammed OTP bit contains a ‘0, programmed bits are 1’s. It is possible to
program the OTP in several sequences. However, only a 0 can be programmed to 1. Once programmed, an OTP bit cannot be set back to 0. For
subsequent programming, bits that are already programmed should be set to 0 to avoid double programming.
During permanent programming, the factory settings D17:D10 should always be set to zero to avoid modification of the factory settings.
Modifying the factory settings may cause irreversible malfunction of the chip.
For permanent programming, a static programming voltage of 8.0-8.5V must be applied at pin PROG (#2). EN_PROG must be sent before
PROG_OTP to enable OTP.
sens sets the sensitivity setting of the Hall elements:
00: gain factor = 1.65 (low sensitivity)
01: gain factor = 1.75
10: gain factor = 1.86
11: gain factor = 2.00 (high sensitivity)
zero position sets the user programmable zero position; the actual angle of the magnet which is displayed as 000
Figure 21. Timing Diagram in OTP 18-bit Read/Write Mode
Command phase
Data phase extended
DCLK
t1
t0
t9
CS
DIO
DIO
t2
t5
t3
HI
HI
t4
CMD2
CMD0
t6
t11
DIO
www.ams.com/AS5030
t7
t8
D17
t10
D16
D0
D16
D0
t13
t12
D17
Revision 2.4
READ
WRITE
25 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.3 OTP Programming Connection
Programming of the AS5030 OTP memory does not require a dedicated programming hardware. The programming can be simply accomplished
over the serial 3-wire interface (see Figure 22) or the optional 2-wire interface (see Figure 8).
For permanent programming (command PROG OTP, #19H), a constant DC voltage of 8.0V ~ 8.5V (≥100mA) must be connected to pin #2
(PROG).
For temporary OTP write (“soft write”; command WRITE OTP, #1FH), the programming voltage is not required.
To secure unintentional programming, any modification of the OTP memory is only enabled after a special password (command #10H) has been
sent to the AS5030.
Figure 22. OTP Programming Connection
+5 V
VDD
13
VDD
11
Output
Micro
Controller
10
Output
8. 0 – 8.5V
VSS
CS
CLK
12
I/O
VDD
AS5030
DI O
2
10µF 100n
100n
PROG
C1
14
C2
15
VSS
3
VSS
8.3.1
Programming in Daisy Chain Mode
Programming in Daisy chain mode is possible for both 3-wire and 2-wire mode (see Figure 17 and Figure 19). For temporary programming (soft
write), no additional connections are required. Programming is executed with the respective programming commands. For permanent
programming, the programming voltage must be applied on pin#2 (PROG) of the device to be programmed. It is also possible to apply the
programming voltage simultaneously to all devices, as the actual programming is only executed by a software command.
A parallel connection of all PROG-pins allows digital programming verification but does not allow analog programming verification.
If analog programming verification is required, each PROG pin must be selected individually for verification.
www.ams.com/AS5030
Revision 2.4
26 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.4 Programming Verification
After programming, the programmed OTP bits may be verified in two ways:
- By digital verification:
this is simply done by sending a READ OTP command (#0FH). The structure of this register is the same as for the OTP PROG or OTP WRITE
commands.
- By analog verification:
By sending an ANALOG OTP READ command (#09H), pin PROG becomes an output, sending an analog voltage with each clock, representing
a sequence of the bits in the OTP register. A voltage of <500mV indicates a correctly programmed bit (“1”) while a voltage level between 2.2V
and 3.5V indicates a correctly unprogrammed bit (“0”). Any voltage level in between indicates improper programming.
Figure 23. Analog OTP Verification
+5 V
VDD
13
VDD
11
Output
Micro
Controller
10
Output
12
I/O
VDD
CS
CLK
2
VSS
AS5030
DI O
PROG
C1
V
100n
14
C2
15
VSS
3
VSS
8.5 AS5030 Status Indicators
Refer to 16-bit Read Command on page 23.
8.5.1
C2 Status Bit
This bit represents the hardware connection of the C2 configuration pin (#15) to determine, which hardware configuration is selected for the
AS5030 in question.
C2 = low: pin C2 is ‘low’, indicating that the AS5030 is in 3-wire mode or a member of a 2-wire daisy chain connection (except the last)
C2 = high: pin C2 is ‘high’, indicating that the AS5030 is in 2-wire mode and/or the last member of a 2-wire daisy chain connection
8.5.2
Lock Status Bit
The Lock signal indicates the ADC lock status. If Lock = low (ADC unlocked), the angle information is invalid.
To determine a valid angular signal at best performance, the following indicators should be set:
Lock = 1
AGC > 00H and < 2FH
Note: The angle signal may also be valid (Lock = 1), when the AGC is out of range (00H or 2FH), but the accuracy of the AS5030 may be
reduced due to the out of range condition of the magnetic field strength.
www.ams.com/AS5030
Revision 2.4
27 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.5.3
Magnetic Field Strength Indicators
The AS5030 is not only able to sense the angle of a rotating magnet, it can also measure the magnetic field strength (and hence the vertical
distance) of the magnet.
This extra feature can be used for several purposes:
- as a safety feature by constantly monitoring the presence and proper vertical distance of the magnet
- as a state-of-health indicator, e.g. for a power-up self test
- as a push-button feature for rotate-and-push types of manual input devices
The magnetic field strength information is available in two forms:
Magnetic Field Strength Hardware Indicator: Pin MagRngn (#1) will be ‘high’, when the magnetic field is too weak. The switching limit is
determined by the value of the AGC. If the AGC value is <3FH, the MagRngn output will be ‘low’ (green range), If the AGC is at its upper limit
(3FH), the MagRngn output will be ‘high’ (red range).
Magnetic Field Strength Software Indicator: D13:D7 in the serial data that is obtained by command READ ANGLE contains the 6-bit
AGC information. The AGC is an automatic gain control that adjusts the internal signal amplitude obtained from the Hall elements to a constant
level. If the magnetic field is weak, e.g. with a large vertical gap between magnet and IC, with a weak magnet or at elevated temperatures of the
magnet, the AGC value will be ‘high’. Likewise, the AGC value will be lower when the magnet is closer to the IC, when strong magnets are used
and at low temperatures.
The best performance of the AS5030 will be achieved when operating within the AGC range. It will still be operational outside the AGC range, but
with reduced performance especially with a weak magnetic field due to increased noise.
Factors Influencing the AGC Value. In practical use, the AGC value will depend on several factors:
The initial strength of the magnet. Aging magnets may show a reducing magnetic field over time which results in an increase of
the AGC
value. The effect of this phenomenon is relatively small and can easily be compensated by the AGC.
The vertical distance of the magnet. Depending on the mechanical setup and assembly tolerances, there will always be some variation of
the vertical distance between magnet and IC over the lifetime of the application using the AS5030. Again, vertical distance variations can be
compensated by the AGC
The temperature and material of the magnet. The recommended magnet for the AS5030 is a diametrically magnetized, 5-6mm diameter
NdFeB (Neodymium-Iron-Boron) magnet. Other magnets may also be used as long as they can maintain to operate the AS5030 within the
AGC range.
Every magnet has a temperature dependence of the magnetic field strength. The temperature coefficient of a magnet depends on the used
material. At elevated temperatures, the magnetic field strength of a magnet is reduced, resulting in an increase of the AGC value. At low
temperatures, the magnetic field strength is increased, resulting in a decrease of the AGC value.
The variation of magnetic field strength over temperature is automatically compensated by the AGC.
OTP Sensitivity Adjustment. To obtain best performance and tolerance against temperature or vertical distance fluctuations, the AGC value
at normal operating temperature should be in the middle between minimum and maximum, hence it should be around 100000 (20H).
To facilitate the “vertical centering” of the magnet+IC assembly, the sensitivity of the AS5030 can be adjusted in the OTP register in 4 steps. A
sensitivity adjustment is recommended, when the AGC value at normal operation is close to its lower limit (around 00H). The default sensitivity
setting is 00H = low sensitivity.
8.5.4
“Push-button” Feature
Using the magnetic field strength software and hardware indicators described above, the AS5030 provides a useful method of detecting both
rotation and vertical distance simultaneously. This is especially useful in applications implementing a rotate-and-push type of human interface
(e.g. in panel knobs and switches).
The MagRngn output is ‘high’, when the magnetic field is below the low limit (weak or no magnet) and low when the magnetic field is above the
low limit (in-range or strong magnet).
A finer detection of a vertical distance change, for example when only short vertical strokes are made by the push-button, is achieved by
memorizing the AGC value in normal operation and triggering on a change from that nominal the AGC value to detect a vertical movement.
www.ams.com/AS5030
Revision 2.4
28 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 24. Magnetic Field Strength Indicator
+5 V
VDD
1k
13
LED 1
VDD
VDD
1
11
Output
Micro
Controller
10
Output
12
I/O
MagRngn
CS
AS5030
CLK
100n
DI O
C1
VSS
14
C2
15
VSS
3
VSS
8.6 High Speed Operation
The AS5030 is using a fast tracking ADC (TADC) to determine the angle of the magnet. The TADC has a tracking rate of 1.15µs (typ).
Once the TADC is synchronized with the angle, it sets the LOCK bit in the status register. In worst case, usually at start-up, the TADC requires a
maximum of 127 steps (127 * 1.15µS = 146.05µs) to lock. Once it is locked, it requires only one cycle (1.15µs) to track the moving magnet.
The AS5030 can operate in locked mode at rotational speeds up to 30.000 rpm.
In Low Power Mode or Ultra-low Power Mode, the position of the TADC is frozen. It will continue from the frozen position once it is powered up
again. If the magnet has moved during the power down phase, several cycles will be required before the TADC is locked again. The tracking time
to lock in with the new magnet angle can be roughly calculated as:
(EQ 3)
t LOCK = 1.15μs ∗ NewPos − OldPos
Where:
tLOCK = time required to acquire the new angle after power up from one of the reduced power modes [µs]
OldPos = Angle position when one of the reduced power modes is activated [°]
NewPos = Angle position after resuming from reduced power mode [°]
8.6.1
Propagation Delay
The Propagation delay is the time required from reading the magnetic field by the Hall sensors to calculating the angle and making it available on
the serial or PWM interface. While the propagation delay is usually negligible on low speeds it is an important parameter at high speeds.
The longer the propagation delay, the larger becomes the angle error for a rotating magnet as the magnet is moving while the angle is calculated.
The position error increases linearly with speed.
The main factors contributing to the propagation delay are:
ADC Sampling Rate. For high speed applications, fast ADCs are essential. The ADC sampling rate directly influences the propagation delay.
The fast tracking ADC used in the AS5030 with a tracking rate of only 1.15µs (typ.) is a perfect fit for both high speed and high performance.
www.ams.com/AS5030
Revision 2.4
29 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Chip Internal Low-pass Filtering. A commonplace practice for systems using analog-to-digital converters is to filter the input signal by an
anti-aliasing filter. The filter characteristic must be chosen carefully to balance propagation delay and noise.
The low-pass filter in the AS5030 has a cut-off frequency of typ. 23.8kHz and the overall propagation delay in the analog signal path is typ.
15.6µs.
Digital Readout Rate. Aside from the chip-internal propagation delay, the time required to read and process the angle data must also be
considered. Due to its nature, a PWM signal is not very usable at high speeds, as you get only one reading per PWM period. Increasing the
PWM frequency may improve the situation but causes problems for the receiving controller to resolve the PWM steps. The frequency on the
AS5030 PWM output is typ. 1.95kHz with a resolution of 2µs/step.
A more suitable approach for high speed absolute angle measurement is using the serial interface. With a clock rate of up to 6MHz, a complete
set of data (21bits) can be read in >3.5µs
8.6.2
Total Propagation Delay of the AS5030
The total propagation delay of the AS5030 is the delay in the analog signal path and the tracking rate of the ADC:
15.6µs + 1.15µs = 16.75µs.
If only the SIN-/COS-outputs are used, the propagation delay is the analog signal path delay only (typ. 15.6µs).
Position Error over Speed.
The angle error over speed caused by the propagation delay is calculated as:
-6
Δφpd = rpm * 6 * 16.75E
in degrees
(EQ 4)
In addition, the anti-aliasing filter causes an angle error calculated as:
Δφlpf = ArcTan [ rpm / ( 60*f0 ) ]
(EQ 5)
Examples of the overall position error caused by speed, including both propagation delay and filter delay:
Speed (rpm)
Total Position Error
(Δφpd + Δφlpf)
100
0.0175°
1000
0.175°
10000
1.75°
8.7 Reduced Power Modes
The AS5030 can be operated in 3 reduced power modes. All 3 modes have in common that they switch off or freeze parts of the chip during
intervals between measurements. In Low Power Mode or Ultra-low Power Mode, the AS5030 is not operational, but due to the fast start-up, an
angle measurement can be accomplished very quickly and the chip can be switched to reduced power immediately after a valid measurement
has been taken. Depending on the intervals between measurements, very low average power consumption can be achieved using such a
strobed measurement mode.
Low Power Mode:reduced current consumption, very fast start-up. Ideal for short sampling intervals (<3ms)
Ultra-low Power Mode:further reduced current consumption, but slower start-up than Low Power Mode. Ideal
for sampling intervals from
3….200ms
Power Cycle mode:zero power consumption (externally switched off)
during sampling intervals, but slower start-up than Ultra-low Power
Mode. Ideal for sampling intervals 200ms
www.ams.com/AS5030
Revision 2.4
30 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.7.1
Low Power Mode and Ultra-low Power Mode
Figure 25. Low Power Mode and Ultra-low Power Mode Connection
R1: optional;
see text
Ion
Ioff
VDD
+5V
VDD
ton
toff
VDD
on/off
C1:
optional;
see text
CS
100n
S
N
CLK
Micro
Controller
DIO
AS5030
VSS C1 C2
VSS
VSS
The AS5030 can be put in Low Power Mode or Ultra-low Power Mode by simple serial commands, using the regular connection for 2-wire or 3wire serial data transmission (see Figure 4 and Figure 8).
The required serial command is SET PWR MODE (11H):
ULP / LPn
PSM
Mode
0
0
Normal operation
0
1
Low Power Mode
1
0
Normal operation
1
1
Ultra-low Power Mode
Note: After returning from Low Power mode or Ultra-low Power mode to normal operation (PSM = 0), if the Hysteresis is enabled (Hys=0), a
general reset must be performed: set bit RST and then clear bit RST using command 15H.
The two following cases describe the typical loop programmed in the software:
Hys = 0. (1 LSB hysteresis)
1.
2.
3.
4.
5.
6.
7.
8.
Wait for CPU interrupt or delay for next angle read (typ. <3ms in LP mode, typ>3ms in ULP mode)
Wake up (PSM = 0)
Set Reset (rst = 1)
Clear Reset (rst = 0)
Wait 1.5ms (Low Power Mode)
Check if Lock = 1 then read angle
Enable Low Power Mode or Ultra-low Power Mode (PSM=1)
Return to 1
www.ams.com/AS5030
Revision 2.4
31 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Hys = 1. (No hysteresis)
1. Wait for CPU interrupt or delay for next angle read (typ. <3ms in LP mode, typ>3ms in ULP mode)
2. Wake up (PSM = 0)
3. Wait 0.01ms (Low Power Mode)
4. Check if Lock = 1 then read angle
5. Enable Low Power Mode or Ultra-low Power Mode (PSM=1)
6. Return to 1
The difference between Low Power Mode and Ultra-low Power Mode is the current consumption and the wake-up time to switch back to active
operation.
Mode
Current Consumption
(typ.)
Wake-up Time to Active
Operation
Active operation
14 mA
1.0 ms (without AGC)
3.8 ms (with locked AGC)
Low Power Mode
1.4 mA
0.15 ms
Ultra-low Power Mode
30 µA
0.5 ms
In both Reduced Power Modes, the AS5030 is inactive. The last state, e.g. the angle, AGC value, etc. is frozen and the chip starts from this
frozen state when it resumes active operation. This method provides much faster start-up than a “cold start” from zero. If the AS5030 is cycled
between active and reduced current mode, a substantial reduction of the average supply current can be achieved. The minimum dwelling time in
active mode is the wake-up time. The actual active time depends on how much the magnet has moved while the AS5030 was in reduced power
mode. The angle data is valid, when the status bit LOCK has been set. Once a valid angle has been measured, the AS5030 can be put back to
reduced power mode. The average power consumption can be calculated as:
(EQ 6)
I avg =
I active ∗ ton + I power _ down ∗ toff
ton + toff
sampling interval = t on + t off
Where:
Iavg average current consumption
Iactive: current consumption in active mode
Ipower_down:current consumption in reduced power mode
ton:time period during which the chip is operated in active mode
toff: time period during which the chip is in reduced power mode
Example: Ultra-low Power Mode; sampling period = one measurement every 10ms.
System constants = Iactive = 14mA, Ipower_down = 30µA, ton(min) = 500µs (startup from Ultra-low Power Mode):
(EQ 7)
I avg =
14mA ∗ 500 μs + 30 μA * 9,5ms
= 729μA
500 μs + 9,5ms
See Figure 27 for an overview table of the average current consumption in the various reduced power modes.
Reducing Power Supply Peak Currents.
An optional RC-filter (R1/C1) may be added to avoid peak currents in the power supply line when the AS5030 is toggled between active and
reduced power mode. R1 must be chosen such that it can maintain a VDD voltage of 4.5V ~ 5.5V under all conditions, especially during long
active periods when the charge on C1 has expired. C1 should be chosen such that it can support peak currents during the active operation
period. For long active periods, C1 should be large and R1 should be small.
www.ams.com/AS5030
Revision 2.4
32 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.7.2
Power Cycling Mode
The power cycling method shown in Figure 26 cycles the AS5030 by switching it on and off, using an external PNP transistor high side switch.
This mode provides the least power consumption of all three modes; when the sampling interval is more than 400ms, as the current consumption
in off-mode is zero.
It also has the longest start-up time of all modes, as the chip must always perform a “cold start“ from zero, which takes about 1.9 ms.
The optional filter R1/C1 may again be added to reduce peak currents in the 5V power supply line.
Figure 26. Application Example III: Ultra-low Power Encoder
+5V
VDD
R1
ton
Ion
0
ton
toff
10k
VDD
toff
VDD
C1
>1µF
on/off
CS
100n
S
N
Micro
Controller
CLK
DIO
AS5030
VSS C1 C2
VSS
VSS
Figure 26 shows an overview of the average supply currents in the three reduced power modes, depending on the sampling interval. The graphs
shows that the Low Power Mode is the best option for sampling intervals <4ms, while the Ultra-low Power Mode is the best option for sampling
intervals between 4~400ms. At sampling intervals > 400ms, the power cycling mode is the best method to minimize the average current
consumption. The curves are based on the figures given in Low Power Mode and Ultra-low Power Mode on page 31.
Figure 27. Average Current Consumption of Reduced Power Modes
AS 5 0 3 0 av e ra g e c u rre nt c o n su m p tio n
5 ,0
avg. current consumption [mA
4 ,5
4 ,0
3 ,5
3 ,0
2 ,5
2 ,0
L o w P o we r M o d e
1 ,5
1 ,0
P o wer C yc lin g M o de
0 ,5
Ultra L o w P owe r M od e
0 ,0
1
10
100
1 0 00
samp lin g in terval [m s]
www.ams.com/AS5030
Revision 2.4
33 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.8 Accuracy of the Encoder System
This chapter describes which individual factors influence the accuracy of the encoder system and how to improve them.
Accuracy is defined as the difference between measured angle and actual angle. This is not to be confused with resolution, which is the smallest
step that the system can resolve.
The two parameters are not necessarily linked together. A high resolution encoder may not necessarily be highly accurate as well.
8.8.1
Quantization Error
There is however a direct link between resolution and accuracy, which is the quantization error:
Figure 28. Quantization Error of a Low Resolution and a High Resolution System
Quantization
Error
ideal function
ideal function
digitized
function
digitized
function
low
resolution
+½ LSB
high
resolution
+½ LSB
-½ LSB
error
-½ LSB
The resolution of the encoder determines the smallest step size. The angle error caused by quantization cannot get better than ± ½ LSB. As
shown in Figure 28, a higher resolution system (right picture) has a smaller quantization error, as the step size is smaller.
For the AS5030, the quantization error is ± ½ LSB = ± 0.7°
Figure 29. Typical INL Error Over 360°
INL including quantization error
1,5
1
INL [°]
0,5
0
-0,5
-1
-1,5
0
45
90
135
180
225
270
315
360
Angle steps
INL
www.ams.com/AS5030
Average (16x)
Revision 2.4
34 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 29 shows a typical example of an error curve over a full turn of 360° at a given X-Y displacement. The curve includes the quantization
error, transition noise and the system error. The total error is ~2.2° peak/peak (± 1.1°).
The sawtooth-like quantization error (see also Figure 28) can be reduced by averaging, provided that the magnet is in constant motion and there
are an adequate number of samples available. The solid bold line in Figure 29 shows the moving average of 16 samples. The INL (intrinsic nonlinearity) is reduced to from ~± 1.1° down to ~± 0.3°. The averaging however, also increases the total propagation delay, therefore it may be
considered for low speeds only or adaptive; depending on speed (see Position Error over Speed on page 30).
8.8.2
Vertical Distance of the Magnet
The chip-internal automatic gain control (AGC) regulates the input signal amplitude for the tracking-ADC to a constant value. This improves the
accuracy of the encoder and enhances the tolerance for the vertical distance of the magnet.
Figure 30. Typical Curves for Vertical Distance Versus ACG Value on Several Untrimmed Samples
Linearity and AGC vs Airgap
64
2,2
56
2,0
1,8
40
32
1,6
24
Linearity [°]
AGC value
48
1,4
16
1,2
8
0
0
500
1000
1500
1,0
2500
2000
Airgap [mm]
[µm]
sample#1
sample#2
sample#3
sample#4
Linearity [°]
As shown in Figure 30, the AGC value (left Y-axis) increases with vertical distance of the magnet.
Consequently, it is a good indicator for determining the vertical position of the magnet, for example as a push-button feature, as an indicator for a
defective magnet or as a preventive warning (e.g. for wear on a ball bearing etc.) when the nominal AGC value drifts away.
If the magnet is too close or the magnetic field is too strong, the AGC will be reading 0,
If the magnet is too far away (or missing) or if the magnetic field is too weak, the AGC will be reading 63 (3FH).
The AS5030 will still operate outside the AGC range, but the accuracy may be reduced as the signal amplitude can no longer be kept at a
constant level.
The linearity curve in Figure 30 (right Y-axis) shows that the accuracy of theAS5030 is best within the AGC range, even slightly better at small
airgaps (0.4mm ~ 0.8mm).
At very short distances (0mm ~ 0.1mm) the accuracy is reduced, mainly due to nonlinearities in the magnetic field.
At larger distances, outside the AGC range (~2.0mm ~ 2.5mm and more) the accuracy is still very good, only slightly decreased from the nominal
accuracy.
Since the field strength of a magnet changes with temperature, the AGC will also change when the temperature of the magnet changes. At low
temperatures, the magnetic field will be stronger and the AGC value will decrease. At elevated temperatures, the magnetic field will be weaker
and the AGC value will increase.
www.ams.com/AS5030
Revision 2.4
35 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Sensitivity Trimming. As the curves for the 4 samples in Figure 30 show, the AGC value will not show exactly the same value at a given
airgap on each part. For example, at 1mm vertical distance, the AGC may read a value between ~11 ~ 24. This is because for normal operation
an exact trimming is not required since the AGC is part of a closed loop system.
However, the AS5030 offers an optional user trimming in the OTP to allow an even tighter AGC tolerance for applications where the information
about magnetic field strength is also utilized, e.g. for rotate-and-push types of knobs, etc.
8.9 Choosing the Proper Magnet
Figure 31. Vertical Magnetic Fields of a Rotating Magnet
typ. 6mm diameter
N
S
Magnet axis
R1
Magnet axis
Vertical field
component
N
S
R1 concentric circle;
radius 1.0 mm
Vertical field
component
Bz
(20…80mT)
0
360
Note: There is no strict requirement on the type or shape of the magnet to be used with the AS5030. It can be cylindrical as well as square in
shape. The key parameter is that the vertical magnetic field Bz, measured at a radius of 1mm from the rotation axis is sinusoidal with a
peak amplitude of 20 ~ 80mT.
www.ams.com/AS5030
Revision 2.4
36 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.9.1
Magnet Placement
Ideally, the center of the magnet, the diagonal center of the IC and the rotation axis of the magnet should be in one vertical line.
The lateral displacement of the magnet should be within
the placement of the chip within the IC package.
± 0.25mm from the IC package center or ± 0.5mm from the IC center, including
The vertical distance should be chosen such that the magnetic field on the die surface is within the specified limits. The typical
distance “z” between the magnet and the package surface is 0.5mm to 1.8mm with the recommended magnet (6mm x 2.5mm). Larger gaps are
possible, as long as the required magnetic field strength stays within the defined limits.
A magnetic field outside the specified range may still produce acceptable results, but with reduced accuracy. The out-of-range condition will be
indicated, when the AGC is at the limits
(AGC= 0: field too strong;
AGC=63=(3FH): field too weak or missing magnet.
Figure 32. Bz Field Distribution Along the X-Axis of a 6mmØ Diametric Magnetized Magnet
Figure 32 shows a cross sectional view of the vertical magnetic field component Bz between the north and south pole of a 6mm diameter
magnet, measured at a vertical distance of 1mm. The poles of the magnet (maximum level) are about 2.8mm from the magnet center, which is
almost at the outer magnet edges. The magnetic field reaches a peak amplitude of ~± 106mT at the poles.
The Hall elements are located at a radius of 1mm (indicated as squares at the bottom of the graph). Due to the side view, the two Hall elements
at the Y-axis are overlapping at X = 0mm, therefore only 3 Hall elements are shown.
At 1mm radius, the peak amplitude is ~± 46mT, respectively a differential amplitude of 92mT.
The vertical magnetic field Bz follows a fairly linear pattern up to about 1.5mm radius. Consequently, even if the magnet is not perfectly centered,
the differential amplitude will be the same as for a centered magnet.
For example, if the magnet is misaligned in X-axis by -0.5mm, the two X-Hall sensors will measure 70mT (@x = -1.5mm) and
-22mt (@x = -0.5mm). Again, the differential amplitude is 92mT.
At larger displacements however, the Bz amplitude becomes nonlinear, which results in larger errors that mainly affect the accuracy of the
system (see also Figure 34)
www.ams.com/AS5030
Revision 2.4
37 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 33. Vertical Magnetic Field Distribution of a Cylindrical 6mm Ø Diametric Magnetized Magnet at 1mm Gap
BZ; 6m m m agnet @ Z=1mm
area of X-Y-misalignment from
center: +/- 0.5mm
N
125
circle of Hall elements on
chip: 1mm radius
100
75
50
25
B z [m T]
0
-25
-50
-75
-100
-125
4
3
2
S
4
3
1
0
2
-1
2
-2
1
0
X-displacem ent [m m]
-3
-1
Y-displacement [m m]
-4
-2
-3
Figure 33 shows the same vertical field component as Figure 32, but in a 3-dimensional view over an area of ± 4mm from the rotational axis.
8.9.2
Lateral Displacement of the Magnet
As shown in the magnet specifications (see page 7), the recommended horizontal position of the magnet axis with respect to the IC package
center is within a circle of 0.25mm radius. This includes the placement tolerance of the IC within the package.
Figure 34 shows a typical error curve at a medium vertical distance of the magnet around 1.2mm (AGC = 24).
The X- and Y- axis of the graph indicate the lateral displacement of the magnet center with respect to the IC center.
At X = Y = 0, the magnet is perfectly centered over the IC. The total displacement plotted on the graph is for ± 1mm in both directions.
The Z-axis displays the worst case INL error over a full turn at each given X-and Y- displacement. The error includes the quantization error of ±
0.7°. For example, the accuracy for a centered magnet is between 1.0 ~ 1.5° (spec = 2° over full temperature range). Within a radius of 0.5mm,
the accuracy is better than 2.0° (spec = 3° over temperature).
www.ams.com/AS5030
Revision 2.4
38 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 34. Typical Error Curve of INL Error Over Lateral Displacement (including quantization error)
INL vs. Displacement: AS5030 for AGC24
4,500-5,000
4,000-4,500
5,000
3,500-4,000
4,500
3,000-3,500
4,000
3,500
3,000
2,500
INL [°]
2,000
1,500
1,000
0,500
0,000
2,500-3,000
1000
750
500
250
2,000-2,500
1,500-2,000
1,000-1,500
0,500-1,000
0,000-0,500
0
-1000
-750
-250
-500
-500
-250
0
250
X Displacem e nt [µm ]
Y Displacem ent [µm ]
- 750
500
-1000
750
1000
8.9.3
Magnet Size
Figure 32 to Figure 34 in this chapter describe a cylindrical magnet with a diameter of 6mm. Smaller magnets may also be used, but since the
poles are closer together, the linear range will also be smaller and consequently the tolerance for lateral misalignment will also be smaller.
If the ± 0.25mm lateral misalignment radius (rotation axis to IC package center) is too tight, a larger magnet can be used. Larger magnets have
a larger linear range and allow more misalignment. However at the same time the slope of the magnet is more flat which results in a lower
differential amplitude.
This requires either a stronger magnet or a smaller gap between IC and magnet in order to operate in the amplitude-controlled area (AGC > 0
and AGC < 63).
In any case, if a magnet other than the recommended 6mm diameter magnet is used, two parameters should be verified:
Verify that the magnetic field produces a sinusoidal wave, when the magnet is rotated. Note that this can be done with the SIN-/COS-
outputs of the AS5030, e.g. rotate the magnet at constant speed and analyze the SIN- (or COS-) output with an FFT-analyzer.
It is recommended to disable the AGC for this test.
Verify that the Bz-Curve between the poles is as linear as possible. This curve may be available from the magnet supplier(s). Alternatively,
the SIN- or COS- output of the AS5030 may also be used together with an X-Y- table to get a Bz-scan of the magnet. Furthermore, the
sinewave tests described above may be re-run at defined X-and Y- misplacements of the magnet to determine the maximum acceptable
lateral displacement range.
It is recommended to disable the AGC for both these tests.
Note: For preferred magnet suppliers, please refer to the ams website (Rotary Encoder section).
www.ams.com/AS5030
Revision 2.4
39 - 44
AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8.10 Physical Placement of the Magnet
The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the chip as shown in the drawing below:
Figure 35. Defined Chip Center and Magnet Displacement Radius
3.2mm
3.2mm
1
2.3975+/-0.055mm
Defined
center
Rd
2.3975+/-0.055mm
Area of recommended maximum
magnet misalignment
Magnet Placement. The magnet’s center axis should be aligned within a displacement radius Rd of 0.25mm from the defined center of the IC.
The magnet may be placed below or above the device. The distance should be chosen such that the magnetic field on the die surface is within
the specified limits. The typical distance “z” between the magnet and the package surface is 0.5mm to 1.5mm, provided the use of the
recommended magnet material and dimensions (6mm x 3mm). Larger distances are possible, as long as the required magnetic field strength
stays within the defined limits.
However, a magnetic field outside the specified range may still produce usable results, but the out-of-range condition will be indicated by
MagRngn (pin 1).
Figure 36. Vertical Placement of the Magnet
N
Die surface
S
Package surface
z
0. 23 +/- 0.1mm
0. 77 +/- 0.15mm
www.ams.com/AS5030
Revision 2.4
40 - 44
AS5030
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
9 Package Drawings and Markings
The device is available in a 16-pin TSSOP package.
Figure 37. 16-pin TSSOP Package
YYWWMZZ
AS5030
Symbol
A
A1
A2
b
c
D
E
E1
e
L
L1
Min
0.05
0.80
0.19
0.09
4.90
4.30
0.45
-
Nom
1.00
5.00
6.40 BSC
4.40
0.65 BSC
0.60
1.00 REF
Max
1.20
0.15
1.05
0.30
0.20
5.10
4.50
0.75
-
Symbol
R
R1
S
Θ1
Θ2
Θ3
aaa
bbb
ccc
ddd
N
Min
0.09
0.09
0.20
0º
-
Nom
-
12 REF
12 REF
0.10
0.10
0.05
0.20
16
Max
8º
-
Notes:
1. Dimensioning & tolerancing conform
to ASME Y14.5M-1994.
2. All dimensions are in millimeters.
Angles are in degrees.
Marking: YYWWMZZ.
YY
WW
M
ZZ
Last two digits of the Year
Manufacturing Week
Assembly plant identifier
Assembly traceability code
www.ams.com/AS5030
Revision 2.4
41 - 44
AS5030
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
JEDEC Package Outline Standard: MO - 153 AB
Thermal Resistance Rth(j-a): 89 K/W in still air, soldered on PCB
9.1 Recommended PCB Footprint
Figure 38. PCB Footprint
Recommended Footprint Data
Symbol
mm
inch
A
7.26
0.286
B
4.93
0.194
C
0.36
0.014
D
0.65
0.0256
E
4.91
0.193
www.ams.com/AS5030
Revision 2.4
42 - 44
AS5030
Datasheet - O r d e r i n g I n f o r m a t i o n
10 Ordering Information
The devices are available as the standard products shown in Table 7.
Table 7. Ordering Information
Ordering Code
Description
Delivery Form
Package
AS5030-ATSU
1 box = 100 tubes á 96 devices
Tubes
16-pin TSSOP
AS5030-ATST
1 reel = 4500 devices
Tape & Reel
16-pin TSSOP
Note: All products are RoHS compliant and ams green.
Buy our products or get free samples online at www.ams.com/ICdirect
Technical Support is available at www.ams.com/Technical-Support
For further information and requests, email us at sales@ams.com
(or) find your local distributor at www.ams.com/distributor
www.ams.com/AS5030
Revision 2.4
43 - 44
AS5030
Datasheet - C o p y r i g h t s
Copyrights
Copyright © 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights
reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the
copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no
warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described
devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal
commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability
applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing
by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third
party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or
indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other
services.
Contact Information
Headquarters
ams AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel
Fax
: +43 (0) 3136 500 0
: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.ams.com/contact
www.ams.com/AS5030
Revision 2.4
44 - 44