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Allegro MicroSystems
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A6850 Datasheet Preview

A6850 Datasheet

Dual Channel Switch Interface IC

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A6850 pdf
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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 sensors
Package: 8 pin SOIC (suffix L)
Description
The Allegro® A6850 is designed to interface between a
microprocessor and a pair of 2-wire Hall effect sensors.
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 sensor applications require the user
to measure the supply current to determine whether the Hall
sensor 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 sensor.
Approximate Scale 1:1
Continued on the next page…
ENABLE1
ENABLE2
Functional Block Diagram
VIN
Control
Block
SENSE1
×1/10 IOUTPUT1
Fault
Detection
OUTPUT1
6850-DS
SENSE2
×1/10 IOUTPUT2
Fault
Detection
GROUND
OUTPUT2



Allegro MicroSystems
Allegro MicroSystems

A6850 Datasheet Preview

A6850 Datasheet

Dual Channel Switch Interface IC

No Preview Available !

A6850 pdf
A6850
Dual Channel Switch Interface IC
Description (continued)
The A6850 eliminates the need for the external series shunt resistor
in Hall sensor applications by incorporating an integrated current
mirror which reports the Hall sensor supply current as a 1/10 value
on the SENSE1 or SENSE2 output pin. A low current Sleep mode
is available (<15 µA) by driving both ENABLE pins low. Also, the
A6850 can be used to interface to mechanical switches.
The A6850 is supplied in an 8-pin Pb (lead) free SOIC package,
with 100% matte tin leadframe plating.
Selection Guide
Part Number
A6850KLTR-T
A6850KL-T
Packing
13-in. reel, 3000 pieces/reel
Tube, 98 pieces/tube
Absolute Maximum Ratings
Characteristic
Supply Voltage
Output Voltage
SENSEx Voltage Range
ENABLEx Voltage Range
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
ESD Rating - Human Body Model
ESD Rating - Charged Device Model
Symbol
VIN
VOUTPUTx
VSENSEx
VENABLEx
TA
TJ(max)
Tstg
HBM
CDM
Notes
Range K
AEC-Q100-002; OUTPUT1 and OUTPUT2
AEC-Q100-002; all other pins
AEC-Q100-011; all pins
Rating
40
–0.3 to 40
–0.3 to 7
–0.3 to 7
–40 to 125
150
–55 to 150
4.5
2.5
1050
Units
V
V
V
V
ºC
ºC
ºC
kV
kV
V
Pin-out Diagram
ENABLE1 1
SENSE1 2
Control Switch
8 OUTPUT1
7 GROUND
ENABLE2 3
SENSE2 4
Switch
6 OUTPUT2
5 VIN
Terminal List Table
Name
Number
ENABLE1
1
SENSE1
2
ENABLE2
3
SENSE2
4
VIN 5
OUTPUT2
6
GROUND
7
OUTPUT1
8
Description
Digital input pulled to ground
Sensed current output
Digital input pulled to ground
Sensed current output
Chip power supply voltage
Switchable voltage supply to sensor
Ground reference
Switchable voltage supply to sensor
Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A6850
Description Dual Channel Switch Interface IC
Maker Allegro MicroSystems
Total Page 9 Pages
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