A6850KLTR-T Allegro Microsystems Inc, A6850KLTR-T Datasheet

IC SWITCH INTERFACE 2CHAN 8-SOIC

A6850KLTR-T

Manufacturer Part Number
A6850KLTR-T
Description
IC SWITCH INTERFACE 2CHAN 8-SOIC
Manufacturer
Allegro Microsystems Inc
Type
Hall Effect Switchr
Datasheet

Specifications of A6850KLTR-T

Input Type
Voltage
Output Type
Voltage
Interface
2-Wire Serial
Current - Supply
5mA
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Interface Applications
Microprocessors, 2 Wire Hall Effect Sensor IC
Supply Voltage Range
4.75V To 26.5V
Power Dissipation Pd
52mW
Operating Temperature Range
-40°C To +125°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
620-1185-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A6850KLTR-T
Manufacturer:
ADI
Quantity:
1 131
Features and Benefits
▪ 4.75 to 26.5 V operation
▪ Low V
▪ 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
Package: 8 pin SOIC (suffix L)
6850-DS Rev. 5
1
two-wire sensor ICs
/
10
current sense feedback
Approximate Scale 1:1
IN
-to-V
OUT
voltage drop
ENABLE1
ENABLE2
SENSE1
SENSE2
Functional Block Diagram
Control
Block
GROUND
Dual Channel Switch Interface IC
VIN
1
1
/
/
10
10
×
×
I
I
OUTPUT1
OUTPUT2
Description
The Allegro
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…
Detection
Detection
Fault
Fault
®
A6850 is designed to interface between a
OUTPUT1
OUTPUT2
A6850

Related parts for A6850KLTR-T

A6850KLTR-T Summary of contents

Page 1

Features and Benefits ▪ 4.75 to 26.5 V operation ▪ Low V -to-V voltage drop IN OUT ▪ current sense feedback 10 ▪ Survive short-to-battery and short-to-ground faults ▪ Survive 40 V load dump ▪ >4 kV ESD ...

Page 2

... The A6850 eliminates the need for the external series shunt resistor in Hall device applications by incorporating an integrated current mirror which reports the Hall IC supply current as a the SENSE1 or SENSE2 output pin. A low current Sleep mode is Selection Guide Part Number A6850KLTR-T 13-in. reel, 3000 pieces/reel Absolute Maximum Ratings Characteristic Supply Voltage Output Voltage ...

Page 3

A6850 ELECTRICAL CHARACTERISTICS at T Characteristics Supply Input Voltage Range Supply Input Quiescent Current 1 Power-Up Time Output Rise Time 2 2 Output Fall Time 2 Enable Delay Time 2 Disable Delay Time OUTPUTx Source Resistance OUTPUTx Leakage Current SENSEx ...

Page 4

A6850 0 mA 10% OUTPUTx 90% current 90% SENSEx voltage 10 Figure 1. Signal Channel Timing, ENABLE1 = ENABLE1 = High, R 50% ENABLEx Voltage OUTPUTx Current 50% SENSEx Voltage 0 V Figure 2. ...

Page 5

A6850 SENSE Pin Outputs The A6850 divides the OUTPUTx pin current by 10 and mirrors it onto the corresponding SENSEx pin. Putting sense resistors, RSENSE , from these pins to ground will create a voltage that can be read by ...

Page 6

A6850 Signal and Enable delays When ENABLEx = 1, current signals applied to the OUTPUTx pins will appear scaled and delayed on the SENSEx pins. The transfer characteristic can be considered that of a low pass filter. The response time ...

Page 7

A6850 T can be estimated by calculating the power dissipation (P J the A6850. To calculate INQ – V – OUTPUT1 OUTPUT1 OUTPUT2 – V – SENSE1 ...

Page 8

A6850 Two-Wire Hall IC Interfacing When voltage is applied to two-wire Hall effect ICs, current flows within one of two narrow ranges. Any current level not within these ranges indicates a fault condition. Signal and Fault Table Condition OUTPUT Pin ...

Page 9

A6850 Mechanical Switch Interfacing The A6850 can be used as an interface between mechanical switches, set in a switch-to-ground configuration, and a low voltage microprocessor. A series resistor must be placed in the circuit to limit current when the mechanical ...

Page 10

A6850 Ganging SENSE1 and SENSE2 In certain applications both outputs may be read with a single ADC channel. The OUTPUTx loads are enabled by alternatively activating ENABLEx. In fact, both ENABLE1 Vcc Controller Figure 7. Outline of ganged configuration V ...

Page 11

A6850 Protection from EMI Transients generated by electromagnetic interference (EMI) can disturb operation of the A6850 or add unwanted noise to the signals being processed. The scheme shown in figure 9 illustrates possible supply decou- pling and signal filtering options. ...

Page 12

A6850 4.90 ±0. 0.20 C 0.41 ±0.10 Copyright ©2006-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec ...

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