A1359 Просмотр технического описания (PDF) - Allegro MicroSystems
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A1359 Datasheet PDF : 12 Pages
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A1359
Factory-Programmed Dual Output Linear Hall Effect Sensor IC
With Analog and Pulse Width Modulated Outputs
Characteristic Definitions
Power-On Time When the supply is ramped to its operating
voltage, the device requires a finite time to power its internal
components before supplying a valid PWM output duty-cycle.
Power-On Time for analog output, tPOVOUT, is defined as the time
it takes for the output voltage to settle within ±10% of its steady
state value after the power supply has reached its minimum speci-
fied operating voltage, VCC(min). (See figure 1.)
Power-On Time is specified in a different way for the PWM out-
put than the analog output. For the PWM output, the Power-On
Time, tPOPWM, is defined as the time it takes for the duty cycle to
settle within ±10% of the target steady state value from the time
the power supply has reached the minimum specified operating
voltage, VCC(min). (See figure 2.)
Response Time The time interval, tRESPONSEPWM or
tRESPONSEVOUT , between: a) when the applied magnetic field
reaches 90% of its final value, and b) when the sensor IC reaches
90% of its output corresponding to the applied magnetic field
(PWM duty cycle or analog VOUT ). Figure 3 illustrates an
example with the PWM output. Response time is conceptually
the same for the analog output.
V
VCC(typ)
VCC
VOUT
90% VOUT
VCC
VCC(min)
tPOVOUT
t1
t2
t1= time at which power supply reaches
minimum specified operating voltage
t2= time at which output voltage settles
within ±10% of its steady state value
under an applied magnetic field
0
+t
VCC(min)
VPWMOUT
First valid duty cycle
tPOPWM
Time
Time
Figure 1. Definition of analog Power-On Time, tPOVOUT
Figure 2. Definition of PWM Power-On Time, tPOPWM
B-field
PWMOUT
ADC – DC corresponds to the A field
BDC – DC corresponds to the B field
CDC – DC corresponds to the 0.9×C field
1 ms
0.9 × C
C
AB
ADC BDC
CDC
Time
Propagation
Delay
Response
Time
Figure 3. Definition of Response Time for PWM output
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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