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A1351
High Precision Linear Hall Effect Sensor IC
 with a Push/Pull, Pulse Width Modulated Output
15
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Programming Pulse Requirements, protocol at T
A
 = 25癈
Characteristic
Symbol
Notes
Min.  Typ.  Max.  Units
Programming Voltage
V
P(LOW)
Measured at the PWMOUT pin.
        5.5    V
V
P(MID)
13   15   16    V
V
P(HIGH)
26   27   28    V
Programming Current
I
P
Minimum supply current required to ensure proper
fuse blowing. In addition, a minimum capacitance,
C
BLOW
 = 0.1 糉, must be connected between the
PWMOUT and GND pins during programming, to
provide the current necessary for fuse blowing.
The blowing capacitor should be removed and the
load capacitance used for proper programming duty
cycle measurements.
300           mA
Pulse Width
t
LOW
Duration of V
P(LOW)
 voltage level for separating
V
P(MID)
 and V
P(HIGH)
 pulses, and delay time after the
final V
BLOW
 pulse.
40            約
t
ACTIVE
Duration of V
P(MID)
 and V
P(HIGH)
 pulses for register
selection or bit field addressing.
40            約
t
BLOW
Duration of V
P(HIGH)
 pulses for fuse blowing.
40            約
Pulse Rise Time
t
Pr
Rise time required for transitions from V
P(LOW)
 to
either V
P(MID)
 or V
P(HIGH)
.
5       100   約
Pulse Fall Time
t
Pf
Fall time required for transitions from V
P(HIGH)
 or
V
P(MID)
 to V
P(LOW)
.
5       100   約
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