Programmable Linear Hall Effect Sensor ICs with Analog Output

Available in a Miniature Thin Profile Surface Mount Package

A1381, A1382,

A1383, and A1384

15

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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.

pulse on the VOUT pin.

Parameter Selection State

This state allows the selection of the

parameter register containing the bit fields to be programmed. To

select a parameter register, increment through the keys by apply-

following programming parameters:

1 pulse - Sens

•

2 pulses - V

•

OUT(Q)

3 pulses - TC

•

the VOUT pin.

Bit Field Addressing State

This state allows the selection of the

individual bit fields to be programmed in the selected parameter

register (see Programming Logic table). To leave this state, either

cycle device power or blow the fuses for the selected code. Note

that 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

cycled before additional programming is attempted. Note: Each

bit representing a decimal code must be blown individually (see

the Fuse Blowing section).

Programming State Machine

Power-Up

Initial

Parameter Selection

Bit Field Addressing

Fuse Blowing

POL,

LOCK

SENS

User Power-Down

Required

2

1

n = total

bits in

register