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PDF AS5245 Data sheet ( Hoja de datos )
| Número de pieza | AS5245 | |
| Descripción | Programmable 360 Magnetic Angle Encoder | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Data Sheet
www.DataSheet4U.com
AS5245
Programmable 360º Magnetic Angle Encoder with Absolute SSI and
PWM Output
1 General Description
The AS5245 is a contactless magnetic angle encoder for accurate
measurement up to 360º and includes two AS5145 devices in a
punched stacked leadframe.
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 may 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 operation of the AS5245 from
3.3V or 5.0V supplies.
The AS5245 is fully automotive qualified to AEC-Q100, grade 0.
2 Key Features
Contactless high resolution rotational position encoding over a
full turn of 360º
Two digital 12-bit absolute outputs
Quadrature A/B (10- or 12-bit) and Index output signal
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
Tolerant to magnet misalignment and air gap variations
Wide temperature range: - 40ºC to +150ºC
Unique Chip Identifier
Fully automotive qualified to AEC-Q100, grade 0
Small package: QFN 32 LD (7x7)
3 Applications
The AS5245 is ideal for applications with an angular travel range
from a few degrees up to a full turn of 360º. The device is suitable for
Automotive applications like Throttle position sensors, Gas/brake
pedal position sensing, Headlight position control, Contactless rotary
position sensing, Front panel rotary switches and Replacement of
potentiometer.
Figure 1. AS5245 Block Diagram
VDD3V3
VDD5V
Mode_Index
LDO 3.3V
Hall Array
&
Frontend
Amplifier
Sin
Cos
Mux
Ang
DSP
Mag
OTP
Register
AS5245
PWM
Interface
Absolute
Interface
(SSI)
Incremental
Interface
MagINCn
MagDECn
PWM
DO
CSn
CLK
PDIO
DTEST1_A
DTEST2_B
Note: This Block Diagram presents only one die
www.austriamicrosystems.com/AS5245
Revision 1.3
1 - 33
1 page  
AS5245
Data Sheet - Pin Assignments
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4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Name
DTest1_A
DTest2_B
NC
Pin Number
1, 32
2, 3
4, 5
Mode_Index
6, 7
VSS 8, 9
PDIO
10, 11
CLK
DO
CSn
PWM
NC
NC
VDD3V3
VDD5V
MagINCn
MagDECn
12, 13
14, 15
16, 17
18, 19
20, 21
22, 23
24, 25
26, 27
28, 29
30, 31
Pin Type
Description
Digital output Test output in default mode
Digital output Test output in default mode
- For internal use. Must be left unconnected
Digital I/O pull-down
Select between slow (open, low: VSS) and fast (high) mode. Internal pull-
down resistor.
Supply pin
Negative Supply Voltage (GND)
OTP Programming Input and Data Input for Daisy Chain mode.
Digital input pull-down Internal pull-down resistor (~74kΩ). Should be connected to VSS if
programming is not used.
Digital input, Schmitt-
trigger input
Clock Input of Synchronous Serial Interface; Schmitt-Trigger input
Digital output / tri-
state
Data Output of Synchronous Serial Interface
Digital input pull-up,
Schmitt-trigger input
Digital output
Chip Select. Active low. Schmitt-Trigger input, internal pull-up resistor
(~50kΩ)
Pulse Width Modulation of approx. 244Hz; 1µs/step (opt. 122Hz; 2µs/
step)
- For internal use. Must be left unconnected
- For internal use. Must be left unconnected
Supply pin
3V-Regulator Output for internal core, regulated from VDD5V. Connect to
VDD5V for 3V supply voltage. Do not load externally.
Supply pin
Positive Supply Voltage, 3.0V to 5.5V
Digital output open Magnet Field Magnitude Increase. Active low. Indicates a distance
drain reduction between the magnet and the device surface.
Digital output open Magnet Field Magnitude Decrease. Active low. Indicates a distance
drain increase between the device and the magnet.
www.austriamicrosystems.com/AS5245
Revision 1.3
5 - 33
5 Page 
AS5245
Data Sheet - Timing Characteristics
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7 Timing Characteristics
TAMB= -40 to +150ºC, VDD5V= 3.0 to 3.6V (3V operation) VDD5V= 4.5 to 5.5V (5V operation), unless otherwise noted.
Table 6. Timing Characteristics
Symbol
Parameter
Conditions
Min Typ Max Units
Synchronous Serial Interface (SSI)
tDOactive
Data output activated (logic high)
Time between falling edge of CSn and
data output activated
100 ns
tCLKFE
First data shifted to output register
Time between falling edge of CSn and
first falling edge of CLK
500
ns
TCLK/2
Start of data output
Rising edge of CLK shifts out one bit at a
time
500
ns
tDOvalid
Data output valid
Time between rising edge of CLK and
data output valid
413 ns
tDOtristate
Data output tri-state
After the last bit DO changes back to “tri-
state”
100 ns
tCSn
Pulse width of CSn
CSn =high; To initiate read-out of next
angular position
500
ns
fCLK Read-out frequency
Pulse Width Modulation Output
Clock frequency to read out serial data >0
1 MHz
fPWM
PWM frequency
Signal period = 4098µs ±10% at TAMB
= -40 to +150ºC
220
224
268
Hz
PWMIN
Minimum pulse width
Position 0d; angle 0 degree
0.90 1 1.10 µs
PWMAX
Maximum pulse width
Position 4098d; angle 359.91 degrees 3686 4096 4506 µs
Programming Conditions
tPROG
Programming time per bit
Time to prog. a singe fuse bit
10
20 µs
tCHARGE
Refresh time per bit
Time to charge the cap after tPROG
1
µs
fLOAD
LOAD frequency
Data can be loaded at n x 2µs
500 kHz
fREAD
READ frequency
Read the data from the latch
2.5 MHz
fWRITE
WRITE frequency
Write the data to the latch
2.5 MHz
www.austriamicrosystems.com/AS5245
Revision 1.3
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS5245.PDF ] | |
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