AS5245
Programmable 360º Magnetic Angle
Encoder with Absolute SSI and PWM
Output
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.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS5245, Programmable 360º
Magnetic Angle Encoder with Absolute SSI and PWM Output
are listed below:
Figure 1:
Added Value of Using AS5245
Benefits
No mechanical wear
High resolution absolute position sensing
Easy to use for motor control
Adjustable zero position
Tolerant to magnet misalignment
Usable for high speed applications
Tolerant to airgap variations
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
ams Datasheet
[v1-08] 2015-Jun-29
Page 1
Document Feedback
AS5245 −
General Description
Benefits
Operates up to 150°C ambient temperature
Supports daisy chain application
Fitting to automotive applications
Two sensors in one package
Features
•
Wide temperature range: - 40ºC to 150ºC
•
Unique Chip Identifier
•
Fully automotive qualified to AEC-Q100, grade 0
•
Small package: QFN 32 LD (7x7)
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
•
Replacement of potentiometer
Page 2
Document Feedback
ams Datasheet
[v1-08] 2015-Jun-29
AS5245 −
General Description
Block Diagram
The functional blocks of this device for reference are
shown below:
Figure 2:
AS5245 Block Diagram
9''9
0DJ,1&Q
0DJ'(&Q
PWM
Interface
6LQ
$QJ
9''9
LDO 3.3V
3:0
Hall Array
&
Frontend
Amplifier
&RV
DSP
0DJ
Absolute
Interface
(SSI)
'2
&6Q
&/.
OTP
Register
3',2
Incremental
Interface
'7(67B$
'7(67B%
Mux
0RGHB,QGH[
AS5245
Note(s) and/or Footnote(s):
1. This block diagram presents only one die
ams Datasheet
[v1-08] 2015-Jun-29
Page 3
Document Feedback
AS5245 −
Pin Assignments
Pin Assignments
Figure 3:
Pin Assignments (Top View)
MagDECn_Bottom
MagINCn_Bottom
VDDA5V_Bottom
MagDECn_Top
DTest1_A_Top
MagINCn_Top
VDDA5V_Top
32 31 30 29 28 27 26 25
DTest1_A_Bottom
DTest2_B_Top
DTest2_B_Bottom
NC
NC
Mode_Index_Top
Mode_Index_Bottom
VSS_Top
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
24
23
22
VDD3V_Bottom
NC
NC
NC
NC
PWM_Top
PWM_Bottom
CSn_Top
VDD3V_Top
21
20
19
18
17
CSn_Bottom
AS5245
PDIO_Top
PDIO_Bottom
CLK_Top
CLK_Bottom
DO_Top
Page 4
Document Feedback
VSS_Bottom
DO_Bottom
ams Datasheet
[v1-08] 2015-Jun-29
AS5245 −
Pin Assignments
Figure 4:
Pin Descriptions
Pin Name
DTest1_A
DTest2_B
NC
Mode_Index
VSS
Pin
Number
1, 32
2, 3
4, 5
6, 7
8, 9
Pin Type
Digital output
Digital output
-
Digital I/O pull-down
Supply pin
Digital input
pull-down
Digital input,
Schmitt-trigger input
Digital output /
tri-state
Digital input pull-up,
Schmitt-trigger input
Digital output
-
-
Supply pin
Supply pin
Digital output open
drain
Digital output open
drain
Description
Test output in default mode
Test output in default mode
For internal use. Must be left unconnected
Select between slow (open, low: VSS) and fast (high)
mode. Internal pull-down resistor. Hard wired
connection to VDD or GND recommended.
Negative Supply Voltage (GND)
OTP Programming Input and Data Input for Daisy
Chain mode.
Internal pull-down resistor (74kΩ).
Should be connected to VSS if programming is not
used.
Clock Input
of Synchronous Serial Interface;
Schmitt-Trigger input
Data Output
of Synchronous Serial Interface
Chip Select.
Active low. Schmitt-Trigger input, internal
pull-up resistor (50kΩ)
Pulse Width Modulation
For internal use. Must be left unconnected
For internal use. Must be left unconnected
3V-Regulator Output for internal core, regulated from
VDD5V. Connect to VDD5V for 3V supply voltage. Do
not load externally.
Positive Supply Voltage, 3.0V to 5.5V
Magnet Field Magnitude Increase.
Active low.
Indicates a distance reduction between the magnet
and the device surface.
Magnet Field Magnitude Decrease.
Active low.
Indicates a distance increase between the device and
the magnet.
PDIO
10, 11
CLK
DO
CSn
PWM
NC
NC
VDD3V3
VDD5V
MagINCn
12, 13
14, 15
16, 17
18, 19
20, 21
22, 23
24, 25
26, 27
28, 29
MagDECn
30, 31
ams Datasheet
[v1-08] 2015-Jun-29
Page 5
Document Feedback
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
