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AK7401 Datasheet PDF - AKM

Part Number AK7401
Description Rotary Position Sensor IC
Manufacturers AKM 
Logo AKM Logo 

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AK7401 datasheet, circuit
[AK7401]
AK7401
Rotary Position Sensor IC
1. General Description
The AK7401 is a monolithic Hall-Effect sensor IC that specializes in detecting rotation angle. A
contactless rotary position sensor is easily designed with a magnet.
The AK7401 is only sensitive to the magnetic flux density applied parallel to the IC surface. This is
obtained through a magnetic concentrator which is mounted on the Hall-Effect elements. It is
advantageous to accurate angular measurements against mechanical displacement.
To detect the rotation angle of a magnet, the AK7401 provides a 12-bit angle data. The angle data output
is available via PWM and serial data protocols.
2. Applications
Steering wheel position sensor, Pedal position sensor, Throttle position sensor, EGR valve position
sensor, Turbo valve position sensor, Motor shaft position sensor
3. Features
360° Contactless Angle Sensor
Angle Resolution : 12bit
Angle Linearity Error: ±0.95°@25°C
Over Voltage Protection: +16V @VDD pin
Reverse Voltage Protection: -16V @VDD, VSS pin
Automotive Temperature Range: -40°C to +150°C
AEC-Q100 Compliant
Output Interface: 3-wire SPI / PWM Push-Pull / PWM NMOS Open-Drain
User Programmable
Zero degree point
Magnet rotation direction: CCW or CW
Angle data average: OFF, SPC (2 times average), HP (8 times average)
PWM frequency: 250, 500 and 1000Hz
PWM polarity
OUT pin output type: Push-Pull / NMOS Open-Drain
Self-diagnostic Functions
Mismatch detect function for triple-redundant EEPROM data
Under and over supply voltage detect function
Under and over magnetic flux density detect function
Environmental Friendly (RoHS Compliant)
Lead free
Halogen free
014002685-E-01
-1-
2015/07

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AK7401 equivalent
[AK7401]
(VDD=4.0 to 5.5V)
Parameter
EEPROM
Endurance
Ambient
Temperature in
Writing
Writing Time
8. EEPROM Characteristics
Symbol Min. Typ.
Max. Unit
Notes
Een
1000
Cycle
This parameter is
guaranteed by design.
Taw 0
+85 C
Tw 20 ms
9. Operating Conditions
Parameter
Symbol Min. Typ. Max. Unit
Notes
Supply Voltage VDD 4.0 5.0 5.5 V
Operating Ambient
Temperature
Ta
-40
-
+150
C
WARNING: Electrical and magnetic characteristics are not guaranteed when operated at or beyond
these conditions.
10. Electrical and Magnetic Characteristics
(Ta=-40 to +150C, VDD=4.0 to 5.5V; unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Magnetic Flux Density Range
Angle Detection Range
Angle Resolution
Angle Linearity Error
BRANGE
ARANGE
ARES
AINL
12bit
Ta=25°C
SPC,HP settings
20
0
-0.95
50
0.088
70
359.9
+0.95
mT
Deg.
Deg.
Deg.
Thermal Angle Drift
Caused by Sensitivity
Mismatch
Thermal Angle Drift
Caused by ADC offset
HMXY
ADCos
Ta=25°C basis
SPC,HP settings
-0.45
-0.18
+0.45 Deg.
+0.18 Deg.
Angle Output Noise
ANOISE
1σ
SPC settings
+0.2 Deg.
Angle Update Period
ACYCLE
100 110
μs
Supply Current
IDD No output load
8 12 mA
Startup Time (Note 3)
TSTART
2.0 ms
Note 3. Startup time is defined as the time from when VDD reaches operating voltage level to when the
serial data connection is available.
014002685-E-01
-5-
2015/07

5 Page
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Information Total 29 Pages
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