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A1667 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A1667
Description  True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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DESCRIPTION
The A1667 is a true zero-speed ring magnet sensor integrated
circuit (IC) consisting of an optimized Hall IC available in
two package options that provides a user-friendly solution for
digital ring magnet sensing applications.
The sensor incorporates a dual element Hall IC that switches
in response to differential magnetic signals created by a
ring magnet. The IC contains a sophisticated compensating
circuit designed to eliminate the detrimental effects of magnet
and system offsets. Digital processing of the analog signal
provides zero-speed performance independent of air gap and
also dynamic adaptation of device performance to the typical
operatingconditionsfoundinautomotiveapplications(reduced
vibration sensitivity). High-resolution peak detecting DACs
are used to set the adaptive switching thresholds of the device.
Hysteresis in the thresholds reduces the negative effects of any
anomalies in the magnetic signal associated with the targets
used in many automotive applications.
Theopen-drainoutputisconfiguredforthree-wireapplications.
This sensor is ideal for obtaining speed and duty cycle
A1667-DS, Rev. 3
MCO-0000168
FEATURES AND BENEFITS
â–ªOptimizedrobustnesstomagneticoffsetvariation
â–ªSmallsignallockoutforimmunityagainstvibration
â–ªTightdutycycleandtimingaccuracyoverfulloperating
temperature range
â–ªTruezero-speedoperation
â–ªAirgapindependentswitchpoints
â–ªLargeoperatingairgapsachievedthroughuseofgain
adjust and offset adjust circuitry
â–ªDefinedpower-onstate(POS)
â–ªWideoperatingvoltagerange
â–ªDigitaloutputrepresentingtargetprofile
â–ªSinglechipsensingICforhighreliability
â–ªSmallmechanicalsize
â–ªFaststartup
â–ªUndervoltagelockout(UVLO)
True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
Functional Block Diagram
A1667
Not to scale
PACKAGES:
GND
VOUT
VCC
TEST
Output
Transistor
Current
Limit
Voltage
Regulator
Hall
Amp
Automatic
Gain
Control
VPROC
PThresh
NThresh
Threshold
Logic
Threshold
Comparator
Offset
Adjust
Reference
Generator
PDAC
NDAC
4-Pin SIP (suffix K)
8-Pin SOIC (suffix L)
KEY APPLICATIONS
• Automotive – Transmissions Applications
• 2-and3-WheelerSpeedApplications
• WhiteGoods–DrumSpeedApplications
Continued on the next page…
October 4, 2018




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