A1360 datasheet(20/25 Pages) ALLEGRO | Low-Noise Programmable Linear Hall Effect Sensor ICs with

20 / 25 page

A1360, A1361,

and A1362

Programming State Machine

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 Ini-

tial state, any VPM pulses on the VOUT pin are ignored. To enter

the zone 1 Parameter Selection state, apply a single VPH pulse on

VOUT pin. To enter the zone 2 Parameter Selection state, apply a

sequence of three VPH pulses on the VOUT pin.

Parameter Selection State

This state allows the selection of the parameter register contain-

ing the bit fields to be programmed. To select a parameter register

within the chosen zone, increment through the keys by sending

VPM pulses on the VOUT pin. Register keys select among the fol-

lowing programming parameters in zone 1:

1 pulse – Sens,

and the following programming parameters in zone 2:

1 pulse – VOUT(Q)

2 pulses – Coarse VOUT(Q) and LOCK

To enter the Bit Field Addressing state, send one VPH pulse on the

VOUT pin.

Note: When parameter selection for zone 1 is bypassed (by send-

ing a second VPH pulse) no register is selected, and VPM pulses

are ignored until after the VPH pulse is sent to enter zone 2.

Bit Field Addressing State

This state allows the selection of the individual bit fields to be

programmed in the selected parameter register (see the Program-

ming 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 VPH pulse on the VOUT

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).

Power-up

Initial

Parameter Selection

(Zone 1)

Parameter Selection

(Zone 2)

Bit Field Addressing

Sens

VPH

VPM

VPH

VPM

[Key sequence]

[Code sequence]

VPM

VOUT(Q)

(Fine)

Coarse

VOUT(Q)

or Lock

2n – 1

n= bits in

Bit Field Addressing

VPH

[Code sequence]

VPM

2n – 1

n= bits in

Fuse Blowing

User Power-down

Required

VPM = VP(LOW) → VP(MID) → VP(LOW)

VPH = VP(LOW) → VP(HIGH) → VP(LOW)

Low-Noise Programmable Linear Hall Effect Sensor ICs with

Adjustable Bandwidth (50 kHz Maximum) and Analog Output

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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