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Allegro - Ring Magnet Sensor IC

Numéro de référence A1667
Description Ring Magnet Sensor IC
Fabricant Allegro 
Logo Allegro 





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A1667 fiche technique
A1667
True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
FEATURES AND BENEFITS
▪ Optimized robustness to magnetic offset variation
▪ Small signal lockout for immunity against vibration
▪ Tight duty cycle and timing accuracy over full operating
temperature range
▪ True zero-speed operation
▪ Air gap independent switch points
▪ Large operating air gaps achieved through use of gain
adjust and offset adjust circuitry
▪ Defined power-on state (POS)
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single chip sensing IC for high reliability
▪ Small mechanical size
▪ Fast startup
▪ Undervoltage lockout (UVLO)
Packages:
8-Pin SOIC (suffix L)
4-Pin SIP (suffix K)
Not to scale
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
operating conditions found in automotive applications (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.
The open-drain output is configured for three-wire applications.
This sensor is ideal for obtaining speed and duty cycle
Continued on the next page…
KEY APPLICATIONS
• Automotive – Transmissions Applications
2- and 3-Wheeler Speed Applications
White Goods – Drum Speed Applications
Functional Block Diagram
VCC
Voltage
Regulator
Hall
Amp
Offset
Adjust
Automatic
Gain
Control
VPROC
PDAC
NDAC
PThresh
Reference
Generator
NThresh
Threshold
Comparator
Threshold
Logic
TEST
A1667-DS, Rev. 1
GND
Current
Limit
Output
Transistor
VOUT

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