A1233 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Dual-Channel Hall-Effect Direction Detection Sensor IC

A1233
Dual-Channel Hall-Effect Direction Detection Sensor IC
Features and Benefits
▪ AEC-Q100 automotive qualified
▪ Precisely aligned dual Hall elements
▪ Tightly matched magnetic switchpoints
▪ Speed and direction outputs
▪ Individual Hall element outputs (L package)
▪ Output short-circuit protection
▪ Operation from an unregulated power supply
▪ Wide operating temperature range
▪ Wide operating voltage range
▪ Integrated EMC-ESD protection
▪ Superior temperature stability and industry-leading
jitter performance through use of advanced chopper
stabilization topology
Packages
4-pin SIP (suffix K)
8-pin SOIC (suffix L)
Not to scale
Description
The A1233 is a dual-channel Hall-effect sensor IC ideal for
use in speed and direction sensing applications incorporating
encoder ring-magnet targets.TheA1233 provides various output
signals that indicate speed and direction of target rotation. The
Hall elements are both photolithographically aligned to better
than 1 μm. Maintaining accurate displacement between the two
active Hall elements eliminates the major manufacturing hurdle
encountered in fine-pitch detection applications. The A1233 is
a highly sensitive, temperature-stable magnetic device ideal for
use in harsh automotive and industrial environments.
The Hall elements of the A1233 are spaced 1.63 mm apart,
which provides excellent speed and direction information
for small-geometry targets. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
quadrature. An on-chip regulator allows the use of this device
over a wide operating voltage range of 3.5 to 24 V.
End-of-line trimming of the Hall element switchpoints provides
tight matching capability. The Allegro^™ patented, high-
frequency chopper stabilization technique cancels offsets in
each channel, providing stable operation over the full specified
temperature and voltage ranges.
Continued on the next page…
VCC
Channel A
Hall
Element
E1
Functional Block Diagram
Programmable
Trim
LDO Regulator
2 Bit
Amp
Low-
Pass
Filter
Direction
Logic
L Package Only
Output
Drive
Output
Drive
OUTA
DIR
Channel B
Hall
Element
E2
Amp
Low-
Pass
Filter
2 Bit
Output
Drive
L Package Only
Output
Drive
SPD
OUTB
GND
A1233-DS, Rev. 1