Precision, High Speed, Hall-Effect Angle Sensor IC
with Integrated Diagnostics for Safety-Critical Applications
A1333
OPERATING CHARACTERISTICS (continued): Valid over the full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristics
MAGNETIC CHARACTERISTICS
Magnetic Field
Symbol
Test Conditions
Min.
Typ.
Max.
Unit[1]
B
Range of input field
–
–
1200
G
ANGLE CHARACTERISTICS
Output[7]
RESANGLE
tANG
Both 12 and 15 bit angle values are available via SPI
ORATE = 0
–
–
12/15
1.0
–
–
bit
µs
Angle Refresh Rate[8]
Angular Latency; valid for ABI or UVW interface;
ORATE = 0
Response Time [6]
Angle Error
tRESPONSE
–
10
–
µs
TA = 25°C, ideal magnet alignment, B = 300 G,
target rpm = 0
–1.0
–1.3
±0.4
±0.6
+1.0
+1.3
degrees
degrees
ERRANG
TA = 150°C, ideal magnet alignment, B = 300 G,
target rpm = 0
TA = 150°C, B = 300 G, angle change from 25°C
TA = –40°C, B = 300 G, angle change from 25°C
–1.4
–
–
1.4
–
degrees
degrees
ANGLEDRIFT
Temperature Drift
Angle Noise [9]
0.9
TA = 25°C, B = 300 G, no internal filtering,
target rpm = 0, 3 sigma noise
–
±0.19
–
degrees
NANG
TA = 150°C, no internal filtering, B = 300 G,
target rpm = 0, 3 sigma noise
–
–
–
±0.25
12.5
0.5
–
–
–
degrees
bits
Effective Resolution [10]
B = 300 G, TA = 25°C
B = 300 G, average maximum drift observed
following AEC-Q100 qualification testing
Angle Drift Over Lifetime [11]
ANGLEDrift_Life
degrees
[1] 1 G (gauss) = 0.1 mT (millitesla).
[2] Maximum operational voltage is reduced at high ambient temperatures (TA). See plots below.
TSSOP-14 Thermal Derating Curve
eTSSOP-24 Thermal Derating Curve
16.5
16.5
15.26 V
12.84 V
144°C
148°C
4
4
150
-40
-40
150
Ambient Temperature, TA (°C)
Ambient Temperature, TA (°C)
[3] Undervoltage flag indicates VCC level below expected operational range. Degraded sensor accuracy may result.
[4] During the power-on phase, the A1333 SPI transactions will be valid within ≈ 300 µs of power on (with no self-tests). Angle reading requires full tPO
to stabilize.
[5] The output voltage specification is to aid in PCB design. The pin is not intended to drive any external circuitry. The specifications indicate the peak
capacitor charging and discharging currents to be expected during normal operation.
[6] Parameter is not guaranteed at final test. Determined by design.
[7] RESANGLE represents the number of bits of data available for reading from the die registers.
[8] The rate at which a new angle reading will be ready.
[9] This value represents 3-sigma or three times the standard deviation of the measured samples.
[10] Effective Resolution is calculated using the formula below:
n
1
log2(360) – log2
i
n
( )
i = 1
where σ is the Standard Deviation based on thirty averaged measurements taken at each of the 32 angular positions, I = 11.25, 22.5, … 360.
[11] Maximum observed angle drift following AEC-Q100 stress was 1.37 degrees.
8
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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