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PDF AS5410 Data sheet ( Hoja de datos )
| Número de pieza | AS5410 | |
| Descripción | 3D-Hall Encoder absolute linear | |
| Fabricantes | austriamicrosystems | |
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Part Number
Data Sheet - Chapter
AS5410
3D-Hall Encoder absolute linear
Preliminary Data Sheet
1 General Description
The chip can measure magnetic fields components in
all three dimensions and converts the magnetic field
information into absolute, position information. The
AS5410 supports absolute linear position
measurement applications.
Only a simple 2-pole magnet is required as the
magnetic field source.
Using two 3D-Hall cells allows both absolute as well
as differential 3D magnetic field measurement.
The differential measurement makes the AS5410
ideal for use in rough industrial position sensing
applications that include not only dust, dirt or
moisture but also unwanted magnetic fields.
All the signal conditioning, including compensation of
temperature effects, magnet-to-chip gap changes as
well as linearization of the output is included in the
IC.
The absolute position information of the magnet is
directly accessible over a SPI interface and PWM
output. A cycle redundancy check (CRC) allows
verification of the received data.
The AS5410 is available in a 14-pin TSSOP package
and is qualified for an ambient temperature range
from -40°C to +105°C.
It operates at a supply voltage of 3.3V +/-10%.
2 Key Features
up to 14-bit full scale resolution
SPI and PWM output
Wide magnetic input range
33 linearization points to achieve high precision
Absolute linear position sensing up to 50 mm
stroke
Suppression of magnetic stray fields
Low power operation
3 Applications
Plunger positioning
Pedal positioning
Pneumatic and hydraulic cylinder positioning
Automation with linear positioning stages through
cascading of several AS5410’s
Figure 1 AS5410 linear position sensing of the magnet
www.austriamicrosystems.com/AS5410
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AS5410
Data Sheet
5.4 Power modes
The AS5410 can be configured for two power modes:
• Continuous mode
• Single shot mode
5.4.1 Continuous mode
In this mode, the AS5410 is always active. The chip continuously updates the output registers. The completion
of a new measurement is signalled with pin READY.
5.4.2 Single shot mode
The AS5410 features an automatic power down mode. After completion of a measurement, the chip
automatically suspends to standby. The SPI interface remains active. The control of this mode is possible over
register 000Eh (see chapter 8). A high on the Ready output indicates that a measurement is completed. The
AS5410 suspends to stand-by state after the Ready output has been set.
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AS5410
Data Sheet
7 Data transfer between AS5410 and Microcontroller
Data is transferred to the AS5410 via the MOSI pin (Master Out – Slave In) with the rising edge of SCK.
Data is read from the AS5410 from the MISO pin (Master In – Slave Out) with the rising edge of SCK.
The data format consists of data streams with 32 bit in length. The first 16 bits define a 16-bit address and the
subsequent 16 bits contain read or write data.
The MSB of the address word A<15> defines the direction of data transfer:
A<15> = 0 READ; data transfer from AS5410 to microcontroller; read measurement data
A<15> = 1 WRITE; data transfer from microcontroller to AS5410; write configuration data
Figure 8: Data transfer between AS5410 and microcontroller
7.1 Read mode
For reading a register, the 16-bit Read address (with A<15>=0) is sent to the MOSI pin. After 16 SCK cycles,
data of the specified address is read from the MISO pin (see Figure ). At the same time, the new address may
be clocked into the MOSI pin.
7.1.1 Continuous measurement
It is possible to continuously read data from the AS5410 even if a new measurement is not yet finished. In this
case, the last measurement data will be read. As soon as a new measurement is completed, it will be available
at the SPI interface.
7.2 Write mode & readback
For additional safety and detection of communication errors, the actual contents of a register may be read at the
same time as new data is written to this register.
In case of a Write command, the 16-bit Write address (with A<15>=1) is sent to the MOSI pin. After 16 SCK
cycles, data following the address bits is written to the specified address via MOSI in (see Figure ) At the same
time, the present data of that register may be read from the MISO pin. Following the 16-bit of data (Data 1 in
Figure ), a new address may be written to the AS5410. While the new address is written, the address from the
previous command is available at the MISO output.
7.3 Checksum
To avoid reading errors, the IC calculates a Checksum at every read cycle from the register content. The
Checksum value is built by an XOR operation of the previous Checksum value and the read register content.
The CRC is calculated every time a register is read.
By choosing how often the Checksum is read and rechecked by the master it is possible to adjust the
communication speed and safety level.
The Checksum value is stored in register 0108h (see chapter 8).
www.austriamicrosystems.com/AS5410
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