FEATURES AND BENEFITS
• Allegro KH package with integrated EMC components
reduces need for external EMI protection
• Digital output with speed and direction information
provides target/ring magnet position information
• Enhanced algorithms provide low jitter and high output
accuracy performance
• Center of package switching alignment
• Highly repeatable across operating temperature range
• EEPROM programming for performance optimization
and production traceability
• Electrical offset compensation through chopper
stabilization
• Zero-crossing switching with internal hysteresis
• Robust test coverage capability using Scan Path and
IDDQ measurement
DESCRIPTION
The A1696PKH is a combined Hall-effect sensor IC and
EMC protection circuit that provides a user-friendly PCB-less
solution for true zero-speed digital crankshaft sensing. The
A1696 provides speed and direction information through a
variable pulse-width output protocol. The open-drain output
provides a voltage output such that the time between falling
electrical edges (period) corresponds to the speed, and the time
between a falling edge and corresponding rising edge (pulse
width) indicates direction. The device can be optimized via
programmable options for crankshaft sensing applications and
can be used to sense either a ring magnet or a ferromagnetic
target (when back-biased with a proper magnet).
Three Hall plates are used to create three differential channels.
These channels, along with advanced direction detection
algorithms, are used to produce a highly accurate output
across the full range of air gap and operating temperatures.
The combination of high accuracy with direction information
provides absolute position on most crank targets in cases of
engine backlash, making it ideal for stop/start engine designs.
The A1696 is provided in a 3-pin SIP package (KH) that is
lead (Pb) free, with 100% tin leadframe plating.