Specifications

Motor Control
Sensing motor speed, position, and movement
www.digikey.com/maxim-industrial 101
Benefits
• Integrated functionality eases motor-
control design, reduces system cost
– Select the analog or digital output
to monitor the Hall-effect sensor’s
condition
– High-side current-sense architecture
eliminates the need for a ground-return
wire and saves 50% wiring cost
• Reliable operation in a harsh
environment
– Protects against up to 60V supply
voltage transients
– Detects a short-to-ground fault
condition to protect the system
MAX9621
The MAX9621 is a dual, 2-wire Hall-effect sensor interface with
analog and digital outputs. This device enables a microprocessor
to monitor the status of two Hall-effect sensors, either through the
analog output by mirroring the sensor current for linear information,
or through the filtered digital output. The input current threshold
can be to the magnetic field. The MAX9621 provides a supply current
to two 2-wire Hall-effect sensors and operates in the 5.5V to 18V
voltage range. The high-side current-sense architecture eliminates
the need for a ground-return wire without introducing ground shift.
This feature saves 50% wiring cost.
Highly accurate, reliable monitoring of motor speed and position with a sensor
interface
Functional diagram of the MAX9621 Hall-effect sensor interface.
REMOTE
GROUND
GND
REMOTE
GROUND
N
S
N
S
0.1μF
BAT
R
SET
BATTERY: 5.5V TO 18V
OPERATING,
60V WITHSTAND
R
PU
10kΩ
R
PU
10kΩ
5kΩ
5kΩ
1.8V TO 5.5V
MICROPROCESSOR
ADC
ADC
SLEEP
AOUT1
AOUT2
DOUT2
DOUT1
FILTER
SLEEP-MODE
CONTROL
REFERENCE
ISET REF
REF
BAT
BAT
FILTER
REF
0.01μF
IN2
IN1
INPUT
SHORT
DETECTION
0.01μF
100kΩ
ECUCONNECTOR
MAX9621