A1351KKTTN-T Allegro Microsystems Inc, A1351KKTTN-T Datasheet - Page 19

• Manufacturer Part Number: A1351KKTTN-T
• Description: IC,HALL-EFFECT SENSOR,SINGLE-ENDED,BICMOS,SIP,4PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: Linear - Unipolar, Bipolarr

Specifications of A1351KKTTN-T

• Sensing Range: 0.055% ~ 0.095% DC/G
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 10mA
• Current - Output (max): 1mA
• Output Type: Digital, Push-Pull
• Features: High Precision
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 4-SIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A1351
Initial State
After system power-up, the programming logic is reset to a
known state. This is referred to as the Initial state. All the bit field
locations that have intact fuses are set to logic 0. While in the
Initial state, any V
To enter the Parameter Selection state, apply a single V
on the PWMOUT pin.
Parameter Selection State
This state allows the selection of the parameter register con-
taining the bit fields to be programmed. To select a parameter
register, increment through the keys by sending V
the PWMOUT pin. Register keys select among the following
programming parameters:
1 pulse – Sens / Coarse D
2 pulses – D
3 pulses – PWM Frequency / Calibration Test Mode
5 pulses – LOCK
(Q)
PM
pulses on the PWMOUT pin are ignored.
User Power-down
(Q)
Power-up
Fuse Blowing
Required
with a Push/Pull, Pulse Width Modulated Output
V
V
PH
PH
Parameter Selection
Bit Field Addressing
High Precision Linear Hall Effect Sensor IC
Programming State Machine
V
V
V
V
PH
PM
PH
PM
Coarse
PM
Sens/
Initial
D
1
(Q)
pulses on
V
PH
PH
V
V
PM
PM
pulse
V
PH
(Fine)
D
V
2
(Q)
PM
[Code sequence]
[Key sequence]
V
PH
Bit Field Addressing State
To enter the Bit Field Addressing state, apply one V
the PWMOUT pin. This state allows the selection of the individ-
ual bit fields to be programmed in the selected parameter register
(see the Programming Logic table). To leave this state, either
cycle device power or blow the fuses for the selected code.
Note: Merely addressing the bit field does not permanently set
the value of the selected programming parameter; fuses must be
blown to do so.
Fuse Blowing State
To blow an addressed bit field, apply a V
OUT pin. Power to the device should then be cycled before
additional programming is attempted.
Note: Each bit representing a decimal code must be blown indi-
vidually (see the Fuse Blowing section).
V
V
PM
PM
V
PH
Calibration
Test Mode
V
f
PWM
PH
n= bits in
2
register
n
/
– 1
V
V
V
PM
PM
PH
V
V
= V
PM
= V
PH
Null
P(LOW)
P(LOW)
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1.508.853.5000; www.allegromicro.com
V
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
PM
→ V
→ V
V
PH
Lock
P(HIGH)
P(MID)
V
PH
PM
→ V
→ V
pulse on the PWM-
P(LOW)
P(LOW)
PH
pulse on
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