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AS5147P (ams) : Total 30 Pages

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General Description
Figure 1:
Added Value of Using the AS5147P
Benefits
High speed application
Easy to use – saving costs on DSP
AS5147P
14-Bit On-Axis Magnetic Rotary
Position Sensor with 12-Bit Binary
Incremental Pulse Count and for
28krpm High Speed Capability
The AS5147P is a high-resolution rotary position sensor for high
speed (up to 28krpm) 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 AS5147P 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 4096 steps / 1024 pulses per
revolution. The resolution of ABI signal is programmable to
4096 steps / 1024 pulses per revolution, 2048steps / 512 pulses
per revolution or 1024steps / 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 AS5147P 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 AS5147P is available as a single die in a compact 14-pin
TSSOP package.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of this device are listed below:
Features
Up to 28krpm
DAEC™ Dynamic angle error compensation
ams Datasheet
[v1-01] 2015-May-12
Page 1
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AS5147P − GeneralDescription
Benefits
Good resolution for motor & position control
Versatile choice of the interface
No programmer needed (via SPI command)
Supports safety challenging applications
Lower system costs (no shielding)
Features
14-bit core resolution
Independent output interfaces: SPI, ABI, UVW, PWM
Zero position, configuration programmable
Self-Diagnostics
Immune to external stray field
Figure 2:
AS5147P Block Diagram
Applications
The AS5147P 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 & alternator.
Block Diagram
The functional blocks of this device for reference are
shown below:
VDD3V3
AS5147P
Volatile Memory
VDD LDO
OTP
SPI
Hall
Sensors
Analog
Front-End
A/D
AGC
GND
ABI
ATAN
(CORDIC)
INTERPOLATOR
Dynamic Angle
Error
Compensation
UWV
PWM Decoder
Selectable
on I or W
CSn
SCL
MISO
MOSI
A
B
I/PWM
U
V
W / PWM
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AS5147P − Pin Assignment
Pin Assignment
Figure 3:
TSSOP-14 Pin Assignment
CSn
CLK
MISO
MOSI
TEST
B
A
I / PWM
GND
VDD3V
VDD
U
V
W / PWM
Figure 4:
Pin Description
Pin Number Pin Name
Pin Type
1 CSn Digital input
2 CLK Digital input
3
MISO
Digital output
4
MOSI
Digital input
5 Test
6 B Digital output
7 A Digital output
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)
Incremental signal B
Incremental signal A
ams Datasheet
[v1-01] 2015-May-12
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AS5147P − PinAssignment
Pin Number Pin Name
Pin Type
8 W/PWM Digital output
9 V Digital output
10 U Digital output
11 VDD Power supply
12 VDD3V3 Power supply
13 GND Power supply
14 I 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.
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[v1-01] 2015-May-12





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