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PDF AS5055 Data sheet ( Hoja de datos )
| Número de pieza | AS5055 | |
| Descripción | Low power 12 bit magnetic rotary encoder | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS5055 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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AS5055 12bit rotary encoder
Datasheet
AS5055
Low power 12 bit magnetic rotary encoder
Preliminary datasheet
1 General Description
The AS5055 is a single-chip magnetic rotary encoder IC with low voltage and low power features.
It includes 4 integrated Hall elements, a high resolution ADC and a smart power management controller.
The angle position, alarm bits and magnetic field information are transmitted over a standard 3-wire or 4-wire SPI interface to
the host processor.
The AS5055 is available in a small QFN 16-pin 4x4x0.85mm package and specified over an operating temperature of -20 to
+85°C.
Benefits
• Complete system-on-chip
• Low power consumption
• Low operating voltage
• Easy to use SPI interface
Applications
• Servo motor control
• Input device for battery operated portable devices
• Robotics
Key Features
• 12 bit resolution
• Standard SPI interface, 3 or 4 wire
• 3.0 to 3.6V core voltage, 1.8 to 3.6V peripheral supply voltage
• Automatic Wakeup over SPI interface
• Interrupt output for conversion complete indication
• Low power mode:
< 8mA (avg) @ 620us readout interval
< 5mA (avg) @ 1ms readout interval
< 500µA (avg) @ 10ms readout interval
< 53µA (avg) @ 100ms readout interval
• Small size QFN-16 4x4x0.85mm
2 Block diagram
Hall Sensors
Power Management
VDD VSS
AS5055
ADC
Cordic
EN_INT/
INT/
SPI interface
VDDp
Wire MOSI MISO SCK SS/
mode
Revision 1.0
www.austriamicrosystems.com
Page 1 of 19
1 page  
AS5055 12bit rotary encoder
Datasheet
6 SPI Communication
The transmitted data consists of 14 bit data, an Error-Flag and a Parity bit. When writing data to the chip, the Error-Flag is not
applicable. The Parity is generated from the upper 15 bit and forms an even parity over the whole frame. The Error-Flag indicates
that a failure occurred in a previous transmission.
6.1 Command Package
Every command sent to the AS5055 is represented with the following layout.
Command Package
Bit MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
RWn Address<13:0> PAR
Bit Definition & Description
RWn indicates read or write command
Address
14 bit address code
PAR Parity Bit (EVEN)
6.2 Read Package (Value read from AS5055)
The read frame always contains two alarm bits, the error and parity flags and the addressed data of the previous read command.
Read Package
Bit MSB 14 13 12 11 10 9 8 7 6 5 4
Data <13:0>
Bit Definition & Description
Data 14 bit addressed data
EF Error flag indicating a transmission error in a previous host transmission
PAR Parity Bit (EVEN)
3
2 1 LSB
EF PAR
6.3 Write Data Package (Value written to AS5055)
The write frame is compatible to the read frame and contains two additional bits, the don’t care and parity flag.
If the previous command was a write command a second package has to be transmitted.
Data Package
Bit MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
Data <13:0>
Don’t
PAR
care
Bit Definition & Description
Data 14 bit data to write to former selected address
PAR Parity bit (EVEN)
Revision 1.0
www.austriamicrosystems.com
Page 5 of 19
5 Page 
AS5055 12bit rotary encoder
Datasheet
7.1 SPI Interface Signals (4-Wire Mode, Wire_mode = 1)
The AS5050 only supports slave operation mode. ThereforeSCK for the communication as well as the /SS signal has to be provided
by the test equipment. The following picture shows a basic interconnection diagram with one master and an AS5050 device and a
principle schematic of the interface core.
SPI_CLK
SPI_SSN
MOSI
(Tester)
MISO
SCK
SS/
MOSI
RXSR
MISO
TXSR
Interface Core
RXSPI
TXSPI
Because the interface has to decode the sent command before it can react and provide data the response of the chip to a specific
command applied at a time T can be accessed in the next transmission cycle ending at T + TCOM.
The data are sent and read with MSB first. Every time the chip is accessed it is sending and receiving data.
7.2 SPI Timing
Revision 1.0
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11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AS5055.PDF ] | |
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