MAX9621_11 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs

19-5024; Rev 1; 9/11
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Dual, 2-Wire Hall-Effect Sensor Interface with
Analog and Digital Outputs
General Description
The MAX9621 is a continuation of the Maxim family of
Hall-effect sensor interfaces that already includes the
MAX9921. The MAX9621 provides a single-chip solution
to interface two 2-wire Hall-effect sensors to low-voltage
microprocessors (FP) through either a digital output for
Hall-effect switches or an analog output for linear infor-
mation or both.
The MAX9621 protects the Hall sensors from supply
transients up to 60V at the BAT supply. Normal operating
supply voltage ranges from 5.5V to 18V. If the BAT sup-
ply rises above 18V, the MAX9621 shuts off the current to
the Hall sensors. When a short-to-ground fault condition
is detected, the current to the Hall input is shut off and
the condition is indicated at the analog output by a zero-
current level and a high digital output.
The MAX9621 provides a minimum of 50Fs blanking
time following Hall sensor power-up or restart. The open-
drain digital outputs are compatible with logic levels up
to 5.5V.
The MAX9621 is available in a 3mm x 5mm, 10-pin
FMAX^M package and is rated for operation in the -40NC
to +125NC temperature range.
Applications
Window Lifters
Seat Movers
Electric Sunroofs
Seatbelt Buckles
Door Power Locks
Ignition Key
Steering Column
Speed Sensing
Features
S Provides Supply Current and Interfaces to Two
2-Wire Hall-Effect Sensors
S 5.5V to 18V Operating Voltage Range
S Protects Hall Sensors Against Up to 60V Supply
Transients
S Low-Power Shutdown for Power Saving
S Filtered Digital Outputs
S Analog Output Mirrors the Hall Sensor Current
S Hall Inputs Protected from Short to Ground
S Hall Sensor Blanking Following Power-Up and
Restart from Shutdown and Short to Ground
S Operates with ±3V Ground Shift Between the Hall
Sensor and the MAX9621
S ±2kV Human Body Model ESD and ±200V Machine
Model ESD at All Pins
S 3mm x 5mm, 10-Pin µMAX Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9621AUB+T -40NC to +125NC
10 FMAX
MAX9621AUB/V+ -40NC to +125NC
10 FMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive qualified part.
Functional Diagram
ISET
REFERENCE ^REF
BAT
BAT
SLEEP-MODE
CONTROL
SLEEP
10kI
AOUT1
DOUT1
IN1
REF
FILTER
Typical Application Circuit appears at end of data sheet.
INPUT
SHORT
DETECTION
IN2
BAT
REF
MAX9621
FILTER
AOUT2
DOUT2
GND
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.