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A6850

Allegro MicroSystems
Part Number A6850
Manufacturer Allegro MicroSystems
Description Dual-Channel Switch Interface
Published Mar 13, 2007
Detailed Description A6850 Dual Channel Switch Interface IC FEATURES AND BENEFITS ▪ 4.75 to 26.5 V operation ▪ Low VIN-to-VOUT voltage drop ...
Datasheet PDF File A6850 PDF File

A6850
A6850


Overview
A6850 Dual Channel Switch Interface IC FEATURES AND BENEFITS ▪ 4.
75 to 26.
5 V operation ▪ Low VIN-to-VOUT voltage drop ▪ 1/10 current sense feedback ▪ Survive short-to-battery and short-to-ground faults ▪ Survive 40 V load dump ▪ >4 kV ESD rating on the output pins, >2 kV on all other pins ▪ Output current limiting ▪ Low operating and Sleep mode currents ▪ Integrates with Allegro A114x and A118x Hall effect two-wire sensor ICs PACKAGE: 8-pin SOIC (suffix L) Approximate Footprint DESCRIPTION The Allegro™ A6850 is designed to interface between a microprocessor and a pair of two-wire Hall effect sensor ICs.
The A6850 uses protected high-side low resistance DMOS MOSFETs to switch the supply voltage to the two Hall effect devices.
Each switch can be controlled independently via individual ENABLE pins and both switches are protected with current-limiting circuitry.
The output switches are rated to operate to 26.
5 V and will source at least 25 mA per channel before current limiting.
Typical two-wire Hall device applications require the user to measure the supply current to determine whether the Hall IC is switched on (magnetic field present) or switched off (no magnetic field present).
This is usually accomplished by using an external series shunt resistor and protection circuits for the microprocessor.
In many systems, the sensed voltage is used as the input to a microprocessor analog-to-digital (A-to-D) input.
This provides the system with an indication of the status of the two-wire switch as well as provides the capability for diagnostic information if there is an open or shorted Hall device.
Continued on the next page… 6850-DS, Rev.
9 MCO-0000882 Functional Block Diagram VIN ENABLE1 ENABLE2 Control Block SENSE1 × 1/10 IOUTPUT1 Fault Detection OUTPUT1 SENSE2 × 1/10 IOUTPUT2 Fault Detection GROUND OUTPUT2 January 31, 2023 A6850 Dual Channel Switch Interface IC Description (continued) The A6850 eliminates the need for the external series shunt resistor ...


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