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PDF AS5045B Data sheet ( Hoja de datos )
| Número de pieza | AS5045B | |
| Descripción | 12-Bit Programmable Magnetic Position Sensor | |
| Fabricantes | ams | |
| Logotipo |  |
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AS5045B
12-Bit Programmable Magnetic Position Sensor
1 General Description
The AS5045B is a contact less magnetic position sensor for accurate
angular measurement over a full turn of 360 degrees.
It is a system-on-chip, combining integrated Hall elements, analog
front end and digital signal processing in a single device.
To measure the angle, only a simple two-pole magnet, rotating over
the center of the chip, is required. The magnet can be placed above
or below the IC.
The absolute angle measurement provides instant indication of the
magnet’s angular position with a resolution of 0.0879º = 4096
positions per revolution. This digital data is available as a serial bit
stream and as a PWM signal.
An internal voltage regulator allows the AS5045B to operate at either
3.3V or 5V supplies.
2 Key Features
Contact less high resolution rotary position sensor over a full
turn of 360 degrees
Figure 1. Blockdiagram Rotary Position Sensor IC
Two digital 12-bit absolute outputs:
- Serial interface
- Pulse width modulated (PWM) output
Quadrature A/B/I output 12-bit
User programmable zero position
Failure detection mode for magnet placement, monitoring, and
loss of power supply
Red-Yellow-Green indicators display placement of magnet in Z-
axis
Serial read-out of multiple interconnected AS5045B devices
using Daisy Chain mode
Tolerant to magnet misalignment and gap variations
Wide temperature range: - 40ºC to +125ºC
Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)
3 Applications
The device is ideal for industrial applications like automatic or
elevator doors, robotics, motor control and optical encoder
replacement.
VDD5V
VDD3V3
LDO 3.3V
Sin
Hall Array
&
Frontend
Amplifier
Cos
ATAN
(Cordic)
Ang
Mag
PWM
Interface
Absolute
Interface
(SSI)
OTP
Register
AS5045B
Incremental
Interface
MagINCn
MagDECn
PWM
DO
CSn
CLK
PDIO
A
B
I
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Revision 1.0
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AS5045B
Datasheet - Absolute Maximum Ratings
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 Section 6 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
Parameter
Min Max Units
Comments
Electrical Parameters
DC supply voltage at pin VDD5V
DC supply voltage at pin VDD3V3
Input pin voltage
Input current (latchup immunity)
-0.3 7
V
5V
-0.3 VDD5V +0.3 V
-100 100
mA
Except VDD3V3
Norm: EIA/JESD78 Class II Level A
Electrostatic Discharge
Electrostatic discharge
± 2 kV
Norm: JESD22-A114E
Temperature Ranges and Storage Conditions
Storage temperature
-55 150 ºC
Min -67ºF; Max +302ºF
Package Body temperature
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
260 ºC Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Humidity non-condensing
5 85 %
Moisture Sensitive Level (MSL)
3
Represents a maximum floor time of 168h
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AS5045B
Datasheet - Detailed Description
8 Detailed Description
The AS5045B is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing the magnetic field
distribution across the surface of the chip. The integrated Hall elements are placed around the center of the device and deliver a voltage
representation of the magnetic field at the surface of the IC.
Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5045B provides accurate high-
resolution absolute angular position information. For this purpose a Coordinate Rotation Digital Computer (CORDIC) calculates the angle and
the magnitude of the Hall array signals.
The DSP is also used to provide digital information at the outputs MagINCn and MagDECn that indicate movements of the used magnet towards
or away from the device’s surface. A small low cost diametrically magnetized (two-pole) standard magnet provides the angular position
information (see Figure 16).
The AS5045B senses the orientation of the magnetic field and calculates a 12-bit binary code. This code can be accessed via a Synchronous
Serial Interface (SSI). In addition, an absolute angular representation is given by a Pulse Width Modulated signal at pin 12 (PWM). This PWM
signal output also allows the generation of a direct proportional analog voltage, by using an external Low-Pass-Filter. The AS5045B is tolerant to
magnet misalignment and magnetic stray fields due to differential measurement technique and Hall sensor conditioning circuitry.
Figure 4. Typical Arrangement of AS5045B and Magnet
8.1 Synchronous Serial Interface (SSI)
Figure 5. Synchronous Serial Interface with Absolute Angular Position Data
CSn TCLK/2
tCLK FE
CLK 1
8
tCSn tCLK FE
18
DO
tDO active
D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
OCF COF
LIN
Mag Mag Even
INC DEC PAR
tDO valid
Angular Position Data
Status Bits
tDO Tristate
1
D11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS5045B.PDF ] | |
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