A1667 datasheet(9/15 Pages) ALLEGRO

Nome de Peças	A1667

Descrição Electrónicos	True Zero-Speed, High Accuracy, Ring Magnet Sensor IC

Download	15 Pages

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Fabricante Electrônico	ALLEGRO [Allegro MicroSystems]

Página de início	http://www.allegromicro.com

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True Zero-Speed, High Accuracy, Ring Magnet Sensor IC

A1667

9

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Chart

Index

Magnetic Field

Peak VPROC

Amplitude

Centered Calculated Range, BHYS

Target Behavior

(Example only)

Peak Magnetic

Signal, BPK

Operate Point. BOP

(70% B(PKPK) ∝

70% VPROC(PKPK))

Release Point. BRP

(30% B(PKPK) ∝

30% VPROC(PKPK))

BHYS

PK(1)

TEAG small

+BPK

(South Polarity)

VPROCPK(1)

BOP(A)

(Previous state)

A

PK(2)

TEAG small

–BPK

(North Polarity)

VPROCPK(2)

BRP(A)

PK(3)

TEAG mid

+BPK

(South Polarity)

VPROCPK(3)

BOP(B)

B

PK(4)

TEAG mid

–BPK

(North Polarity)

VPROCPK(4)

BRP(B)

PK(5)

TEAG large

+BPK

(South Polarity)

VPROCPK(5)

BOP(C)

C

PK(6)

TEAG large

–BPK

(North Polarity)

VPROCPK(6)

BRP(C)

PK(7)

TEAG mid

+BPK

(South Polarity)

VPROCPK(7)

BOP(D)

D

PK(8)

TEAG mid

–BPK

(North Polarity)

VPROCPK(8)

BRP(D)

PK(9)

TEAG small

+BPK

(South Polarity)

VPROCPK(9)

(Next state)

PK(2)

PK(1)

PK(3)

PK(5)

PK(6)

PK(8)

PK(9)

PK(7)

PK(4)

BHYS(D)

BHYS(C)

t+

V+

+B

–B

BRP(A)

BOP(A)

BRP(B)

BRP(C)

BOP(C)

BRP(D)

BOP(D)

BOP(B)

BHYS(A)

BHYS(B)

Figure 5. The Continuous Update algorithm operation. Not detailed in the figure are the boundaries for peak capture DAC

movement which intentionally limit the amount of inward signal variation the IC is able to react to over a single transition. The

algorithm is used to establish and subsequently update the device switchpoints (BOP and BRP). The hysteresis, BHYS(#x), at each

target feature configuration results from this recalibration, ensuring that it remains properly proportioned and centered within the

peak-to-peak range of the internal analog signal, VPROC.

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