Diodes AH921 - Manual

Data Sheet
HIGH SENSITIVITY CMOS HALL-EFFECT LATCH AH921
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
1
General Description
The AH921 is a Hall-effect latch designed in mixed
signal CMOS technology. It is quite suitable for use
in automotive, industrial and consumer applications.
Superior high-temperature performance is made
possible through dynamic offset cancellation, which
reduces the residual offset voltage normally caused
by device over-molding, temperature dependencies,
and thermal stress. The device integrates a voltage
regulator, Hall-voltage generator, small-signal
amplifier, chopper stabilization, schmitt trigger, and
is directly drivable by the output.
An on-board regulator permits operation with supply
voltage from 3.5V to 24V.
The AH921 is available in TO-92S-3 and SOT-23-3
packages, which are optimized for most applications.
Features
• Wide Operating Voltage Range from 3.5 to 24V
• Symmetrical Switch Points
• Chopper-stabilized Amplifier Stage
• Superior Temperature Stability
• Compact Size
• Built-in Pull-up Resistor
• ESD Rating: 3500V (Human Body Model)
Applications
• Brushless DC Motor Commutation
• Brushless DC Fan
• Solid-state Switch
• Revolution Counting
• Speed Detection
• High Sensitivity and Unconnected Switch
Figure 1. Package Types of AH921
TO-92S-3 SOT-23-3