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PDF AS5145B Data sheet ( Hoja de datos )
| Número de pieza | AS5145B | |
| Descripción | 12-Bit Programmable Magnetic Rotary Encoder | |
| Fabricantes | ams | |
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General Description
Figure 1:
Added Value of Using AS5145
Benefits
• Highest reliability and durability
• Simple programming
• Multiple interfaces
• Ideal for motor applications
• Failure diagnostics
• Easy setup
AS5145H/AS5145A/
AS5145B
12-Bit Programmable Magnetic Rotary
Encoder
The AS5145 is a contactless magnetic rotary encoder 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 AS5145 to operate at
either 3.3V or 5V supplies.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS5145H/AS5145A/AS5145B,
12-Bit Programmable Magnetic Rotary Encoder are listed
below:
Features
• Contactless high resolution rotational position encoding
over a full turn of 360 degrees
• Simple user-programmable zero position and settings
• Serial communication interface (SSI)
• 10-bit pulse width modulated (PWM) output
• Quadrature A/B and Index output signal
• Rational speeds up to 30,000 rpm
• Failure detection mode for magnet placement monitoring
and loss of power supply
• Serial read-out of multiple interconnected AS5145 devices
using Daisy Chain mode
ams Datasheet
[v2-00] 2016-Feb-05
Page 1
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1 page  
AS5145H/AS5145A/AS5145B − Pin Assignment
Pin 11 Chip Select (CSn; active low) selects a device within a
network of AS5145 encoders and initiates serial data transfer.
A logic high at CSn puts the data output pin (DO) to tri-state
and terminates serial data transfer. This pin is also used for
alignment mode (see Alignment Mode) and programming
mode (see Programming the AS5145).
Pin 12 allows a single wire output of the 12-bit absolute position
value. The value is encoded into a pulse width modulated signal
with 1μs pulse width per step (1μs to 4096μs over a full turn).
By using an external low pass filter, the digital PWM signal is
converted into an analog voltage, e.g. for making a direct
replacement of potentiometers possible.
ams Datasheet
[v2-00] 2016-Feb-05
Page 5
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5 Page 
AS5145H/AS5145A/AS5145B − Electrical Characteristics
Figure 8:
Input Specification
System Specifications
TAMB = -40°C to 150°C, VDD5V = 3.0 to 3.6V (3V operation)
VDD5V = 4.5 to 5.5V (5V operation) unless otherwise noted.
Symbol
Parameter
Condition
Min Typ Max Unit
RES Resolution
0.088 deg
12 bit
INLopt
INLtemp
INL
DNL
Integral non-linearity
(optimum)
Maximum error with respect to
the best line fit. Centered
magnet without calibration,
TAMB =25 ºC.
Integral non-linearity
(optimum)
Maximum error with respect to
the best line fit.
Centered magnet without
calibration,
TAMB = -40°C to 150ºC
Integral non-linearity
Best line fit =
(Errmax – Errmin) / 2
Over displacement tolerance
with 6mm diameter magnet,
without calibration,
TAMB = -40°C to 150ºC
Differential non-linearity 12-bit, no missing codes
± 0.5 deg
± 0.9 deg
± 1.4 deg
± 0.044 deg
TN Transition noise
1 sigma, fast mode (MODE = 1)
1 sigma, slow mode
(MODE = 0 or open)
0.06
deg
0.03 RMS
tPwrUp Power-up time
Fast mode (Mode = 1);
Until status bit OCF = 1
Slow mode (Mode = 0 or open);
Until OCF = 1
20
ms
80
tdelay
System propagation
delay
absolute output : delay
of ADC, DSP and
absolute interface
Fast mode (MODE = 1)
Slow mode (MODE = 0 or open)
96
μs
384
tdelayINC
System propagation
delay incremental
output AS5145A and
AS5145B: delay of ADC,
DSP and incremental
interface
Only fast mode possible
192 μs
ams Datasheet
[v2-00] 2016-Feb-05
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS5145B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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| AS5145A | 12-Bit Programmable Magnetic Rotary Encoder | ams |
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