Maker : Allegro MicroSystems
Part No. : A6850

  Datasheet PDF : A6850.pdf
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Product Information

www.DataSheet4U.com A6850 Dual Channel Switch Interface IC ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Features and Benefits 4.75 to 26.5 V operation Low VIN-to-VOUT voltage drop 1/ current sense feedback 10 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 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. Package: 8 pin SOIC (suffix L) Approximate Scale 1:1 Continued on the next page… Functional Block Diagram VIN ENABLE1 Control Block ENABLE2 SENSE1 1/ 10 × IOUTPUT1 Fault Detection OUTPUT1 SENSE2 1/ 10 × IOUTPUT2 Fault Detection OUTPUT2 GROUND 6850-DS A6850 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 Dual Channel Switch Interface IC 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 A6850KLTR-T A6850KL-T Part Number 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 AEC-Q100-00; OUTPUT1 and OUTPUT AEC-Q100-00; all other pins AEC-Q100-011; all pins Range K Notes Rating 40 –0.3 to 40 –0.3 to 7 –0.3 to 7 –40 to 15 150 –55 to 150 4.5 .5 1050 Units V V V V ºC ºC ºC kV kV V Pin-out Diagram Terminal List Table Name ENABLE1 Number 1  3 4 5 6 7 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 ENABLE1 1 Control Switch 8 OUTPUT1 SENSE1 ENABLE SENSE VIN OUTPUT GROUND OUTPUT1 SENSE1 2 7 GROUND ENABLE2 3 Switch 6 OUTPUT2 SENSE2 4 5 VIN Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com  A6850 Dual Channel Switch Interface IC ELECTRICAL CHARACTERISTICS at TJ = -40 to +150°C (unless noted otherwise) Characteristics Symbol Test Conditions Supply Input Voltage Range VIN Operating mode, IOUTPUTx = 0 mA Sleep mode: Supply Input Quiescent Current IINQ ENABLE1 and ENABLE low VOUTPUT1 = VOUTPUT = 0...

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