Specifications

127Motor Control: Featured Products
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% of the
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
Highly Accurate, Reliable Monitoring of Motor
Speed and Position with a Sensor Interface
MAX9621
The MAX9621 is a dual, 2-wire Hall-eect sensor interface with analog and digital
outputs. This device enables a microprocessor to monitor the status of two Hall-
eect sensors, either through the analog output by mirroring the sensor current for
linear information, or through the ltered digital output. The input current threshold
can be adjusted to the magnetic eld. The MAX9621 provides a supply current
to two 2-wire Hall-eect 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% of the wiring cost.
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
Functional diagram of the MAX9621 Hall-effect sensor interface.