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PDF AS5048A Data sheet ( Hoja de datos )
| Número de pieza | AS5048A | |
| Descripción | Magnetic Rotary Encoder | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS5048A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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General Description
Figure 1:
Added Value of using AS5048
Benefits
No external programmer needed
High precision
Easy to use
Low material costs (no shielding)
ams Datasheet: 2014-Jun-05 [v1-06]
AS5048A/AS5048B
Magnetic Rotary Encoder
(14-bit Angular Position Sensor)
The AS5048 is an easy to use 360° angle position sensor with a
14-bit high resolution output. The maximum system accuracy
is 0.05° assuming linearization and averaging is done by the
external microcontroller.
The IC measures the absolute position of the magnet’s rotation
angle and consists of Hall sensors, analog digital converter and
digital signal processing. The absolute position information of
the magnet is directly accessible over a PWM output and can
be read out over a standard SPI or a high speed I²C interface.
AS5048A has a SPI interface, AS5048B I²C interface. Both devices
offer a PWM output.
The zero position can be programmed via SPI or I²C command.
This simplifies the assembly of the complete system because
the zero position of the magnet does not need to be
mechanically aligned. The sensor tolerates misalignment, air
gap variations, temperature variations and as well external
magnetic fields. This robustness and wide temperature range
(-40°C up to +150°C) of the AS5048 makes the IC ideal for
rotation angle sensing in harsh industrial and medical
environments. Several AS5048 ICs can be connected in daisy
chain for serial data read out. An internal voltage regulator
allows the AS5048 to operate at either 3.3 V or 5 V supplies.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS5048A/AS5048B, Magnetic
Rotary Encoder (14-bit Angular Position Sensor) are listed
below:
Features
Contactless rotary position sensor over 360°
Immune to external magnetic stray fields
14-bit resolution (0.0219°/LSB)
Standard SPI or I2C interface and PWM
Zero position programmable via SPI or I2C
Temperature range: -40°C to +150°C
AS5048A/AS5048B – 1
1 page  
Pin Assignment
Figure 6:
TSSOP14 Pin Description for AS5048B
Pin AS5048B
Type
Description
1
SDA
Digital I/O with open drain
output
Data pin I²C interface
2 SCL
I²C clock input
3
A2
Digital input with schmitt
trigger
I²C address selection pin 3
4 A1
I²C address selection pin 4
5 TEST
6 TEST
7 TEST
8 TEST
9 TEST
10 TEST
Analog I/O
Test pins. These pins should be grounded to GND.
11 VDD5V
Positive Supply Voltage, 3.0 to 5.5 V
12 VDD3V
Supply pad
3.3V Regulator output; internally regulated from VDD.
Connect to VDD for 3V supply voltage. 10μF capacitor
to GND required in 5V operation mode
13 GND
Negative Supply Voltage (GND)
14
PWM
Digital output – push-pull Pulse Width Modulation output
ams Datasheet: 2014-Jun-05 [v1-06]
AS5048A/AS5048B – 5
5 Page 
Operation
Figure 12:
SPI Connection AS5048A with μC
SPI_CLK
SPI_SSN
MOSI
Master Device
(Tester)
MISO
CLK
CSn
MOSI
MISO
RXSR
TXSR
Interface Core
RXSPI
TXSPI
AS5048A
Figure 13:
SPI Command/Response Data Flow
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.
MSB
LSB
MOSI
Command 1
MSB
LSB
Command 2
MSB
TCOM
LSB
Command 3
MSB
LSB
Command N
MISO
MSB
NOP
LSB
Transmission 1
Response 1
MSB
LSB
Transmission 2
Response 2
MSB
LSB
Transmission 3
Response N-1
MSB
LSB
Transmission N
ams Datasheet: 2014-Jun-05 [v1-06]
AS5048A/AS5048B – 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS5048A.PDF ] | |
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