A6850 Datasheet, PDF (1/12 Pages) Altera Corporation – Asynchronous Communications Interface Adapter

A6850
Dual Channel Switch Interface IC
Features and Benefits
▪ 4.75 to 26.5 V operation
▪ Low V_IN-to-V_OUT 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 Scale 1:1
Description
The Allegro^® A6850 is designed to interface between a
microprocessor and a pair of 2-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…
Functional Block Diagram
ENABLE1
ENABLE2
VIN
Control
Block
SENSE1
× ¹/₁₀ I_OUTPUT1
Fault
Detection
OUTPUT1
6850-DS Rev. 5
SENSE2
× ¹/10 I_OUTPUT2
Fault
Detection
GROUND
OUTPUT2