AS5147
14-Bit On-Axis Magnetic Rotary
Position Sensor with 11-Bit Binary
Incremental Pulse Count
General Description
The AS5147 is a high-resolution rotary position sensor for fast
absolute angle measurement over a full 360-degree range. This
new position sensor is equipped with a revolutionary
integrated dynamic angle error compensation (DAEC™) with
almost 0 latency.
The robust design of the device suppresses the influence of any
homogenous external stray magnetic field. A standard 4-wire
SPI serial interface allows a host microcontroller to read 14-bit
absolute angle position data from the AS5147 and to program
non-volatile settings without a dedicated programmer.
Incremental movements are indicated on a set of ABI signals
with a maximum resolution of 2048 steps / 512 pulses per
revolution. The resolution of the ABI signal is programmable to
1024 steps / 256 pulses per revolution.
Brushless DC (BLDC) motors are controlled through a standard
UVW commutation interface with a programmable number of
pole pairs from 1 to 7. The absolute angle position is also
provided as PWM-encoded output signal.
The AS5147 supports embedded self-diagnostics including
magnetic field strength too high, magnetic field strength too
low or lost magnet, and other related diagnostic features.
The product is defined as SEooC (Safety Element out of Context)
according ISO26262 including FMEDA, safety manual and third
party qualification.
The AS5147 is available as a single die in a compact 14-pin
TSSOP package.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-10] 2016-Apr-27
Page 1
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AS5147 −
General Description
Key Benefits & Features
The benefits and features of AS5147, 14-Bit On-Axis Magnetic
Rotary Position Sensor with 11-Bit Binary Incremental Pulse
Count are listed below:
Figure 1:
Added Value of Using the AS5147
Benefits
• Easy to use – saving costs on DSP
• Good resolution for motor and position control
• Versatile choice of the interface
• No programmer needed (via SPI command)
• Supports safety challenging applications
• Lower system costs (no shielding)
Features
• DAEC™ Dynamic angle error compensation
• 14-bit core resolution
• Independent output interfaces: SPI, ABI, UVW,
PWM
• Zero position, configuration programmable
• Self-Diagnostics
• Immune to external stray field
Applications
The AS5147 has been designed to support BLDC motor
commutation for the most challenging automotive
applications (AEC-Q100 grade 0 automotive qualified) such as
electric power steering (EPS), transmission (gearbox, actuator),
pump, brake (actuator) and starter and alternator.
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ams Datasheet
[v1-10] 2016-Apr-27
AS5147 −
General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
AS5147 Block Diagram
VDD3V3
AS5147
VDD
LDO
Volatile Memory
SPI
OTP
CSn
SCL
MISO
MOSI
A
B
I/PWM
U
V
W / PWM
ABI
Hall
Sensors
Analog
Front-End
Dynamic Angle
Error
Compensation
A/D
ATAN
(CORDIC)
INTERPOLATOR
UWV
AGC
PWM Decoder
Selectable
on I or W
GND
ams Datasheet
[v1-10] 2016-Apr-27
Page 3
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AS5147 −
Pin Assignment
Pin Assignment
Figure 3:
TSSOP-14 Pin Assignment
CSn
CLK
I / PWM
GND
MOSI
TEST
B
A
AS5147
MISO
VDD3V
VDD
U
V
W / PWM
Figure 4:
Pin Description
Pin Number
1
2
3
4
5
6
7
Pin Name
CSn
CLK
MISO
MOSI
Test
B
A
Pin Type
Digital input
Digital input
Digital output
Digital input
Description
SPI chip select (active low)
SPI clock
SPI master data input, slave output
SPI master data output, slave input
Test pin (connect to ground)
Digital output
Digital output
Incremental signal B
Incremental signal A
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ams Datasheet
[v1-10] 2016-Apr-27
AS5147 −
Pin Assignment
Pin Number
8
9
10
11
12
13
14
Pin Name
W/PWM
V
U
VDD
VDD3V3
GND
I
Pin Type
Digital output
Digital output
Digital output
Power supply
Power supply
Power supply
Digital output
Description
Commutation signal W or PWM-encoded output
Commutation signal V
Commutation signal U
5V power supply voltage for on-chip regulator
3.3V on-chip low-dropout (LDO) output. Requires an
external decoupling capacitor (1μF)
Ground
Incremental signal I (index) or PWM
Note(s) and/or Footnote(s):
1. Floating state of a digital input is not allowed.
2. If SPI is not used, a Pull up resistor on CSn is required.
3. If SPI is not used, a Pull down resistor on CLK and MOSI is required.
4. If SPI is not used, the pin MISO can be left open.
5. If ABI, UVW or PWM is not used, the pins can be left open.
ams Datasheet
[v1-10] 2016-Apr-27
Page 5
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