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A1667LLTR-T Datasheet Preview

A1667LLTR-T Datasheet

Ring Magnet Sensor IC

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A1667LLTR-T pdf
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



Allegro
Allegro

A1667LLTR-T Datasheet Preview

A1667LLTR-T Datasheet

Ring Magnet Sensor IC

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A1667LLTR-T pdf
A1667
True Zero-Speed, High Accuracy, Ring Magnet Sensor IC
DESCRIPTION (continued)
information using ring magnet based systems in applications such
as automotive transmissions and industrial equipment.
The A1667 is available in a 4-pin SIP through-hole package (suf-
fix K) and an 8-pin SOIC surface-mount package (suffix L). Both
packages are lead (Pb) free with 100% matte-tin-plated leadframes.
SELECTION GUIDE
Part Number
Packaging
A1667LK-T
4-pin SIP through hole
A1667LLTR-T
8-pin SOIC surface mount
*Contact Allegrofor additional packing options
Packing*
Bulk, 500 pieces per bag
3000 pieces per 13-in. reel
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Supply Voltage
Reverse Supply Voltage
VCC
VRCC
Reverse Supply Current
IRCC
Reverse Output Voltage
VROUT
Output Sink Current
IOUT
Operating Ambient Temperature
TA
Maximum Junction Temperature
TJ(max)
Storage Temperature
Tstg
Notes
See Power Derating section
Range L
Rating
26.5
–18
–50
–0.5
25
–40 to 150
165
–65 to 170
Unit
V
V
mA
V
mA
ºC
ºC
ºC
PINOUT DIAGRAMS AND TERMINAL LIST TABLE
1234
Package K, 4-Pin SIP
18
27
36
45
Package L, 8-Pin SOIC
Terminal List
Number
KL
11
Name
VCC
Function
Supply voltage
2 2 VOUT Device output
3 3 TEST Test pin (float or tie to GND)
4 4 GND Ground
5,6,7,8
NC No connect*
* Pins 5, 6, 7, and 8 should be externally connected to Ground.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A1667LLTR-T
Description Ring Magnet Sensor IC
Maker Allegro
Total Page 15 Pages
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