Allegro MicroSystems Inc. has developed an open loop Hall-effect sensor IC
with what it says provides near closed loop performance in accuracy and
Allegro’s ACS716 current sensor IC is aimed at current sensing
applications in industrial, commercial, and communications systems. The device
is offered in a small footprint surface mount SOIC16 package that allows easy
implementation in customer applications, and is optimized for 3.3 V supply
The ACS716 consists of a precision linear Hall sensor IC with a copper
conduction path located near the surface of the silicon die. Applied current
flows through the copper conduction path, and the analog output voltage from
the Hall sensor IC linearly tracks the magnetic field generated by the applied
current. The accuracy of the ACS716 is maximized with this proprietary
packaging configuration because the Hall element is situated in extremely close
proximity to the current to be measured.
High level immunity to current conductor dV/dt and stray electric fields,
offered by Allegro proprietary integrated shield technology, guarantees low
ripple at output and low offset drift in high-side, high voltage applications.
The voltage on the overcurrent input (VOC pin) allows customers to define an
overcurrent fault threshold for the device. When the current flowing through
the copper conduction path (between the IP+ and IP– pins) exceeds this
threshold, the open drain overcurrent fault pin will transition to a logic low
The internal resistance of the copper path used for current sensing is
typically 1 mΩ, for low power loss. Also, the current conduction path is
electrically isolated from the low voltage sensor inputs and outputs. This
allows the ACS716 family of sensor ICs to be used in applications requiring
electrical isolation, without the use of optoisolators or other costly
Pricing: $1.95 in quantities of 1,000.
Datasheet: Click here.