MAX9621AUB+ Maxim Integrated Products, MAX9621AUB+ Datasheet - Page 12

• Manufacturer Part Number: MAX9621AUB+
• Description: IC HALL EFFECT SENSOR 10UMAX
• Manufacturer: Maxim Integrated Products
• Type: Hall Effect Sensorr

Specifications of MAX9621AUB+

• Input Type: Logic
• Output Type: Analog, Digital
• Interface: 2-Wire
• Current - Supply: 1mA
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Operating Supply Voltage: 5.5 V to 18 V
• Supply Current: 1 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual, 2-Wire Hall-Effect Sensor Interface with
Analog and Digital Outputs
Sleep mode can be used in applications that do not
continuously require the polling of the Hall sensors. In
such cases, the FP can enable the MAX9621 for a short
time, check the sensor status, and then put the MAX9621
back to sleep. A blanking period follows upon exiting
sleep mode.
The MAX9621 targets applications with 2-wire Hall-effect
sensors. 2-wire sensors have connections for supply and
ground. The output level is signaled by means of modula-
tion of the current drawn by the Hall sensor from its supply.
The two threshold currents for high/low are generally in the
range of 5mA to 14mA. Thus, the interfacing of a 2-wire
sensor is not simply a matter of detecting two voltage
thresholds, but requires a coarse current-sense function.
Because of the high-side current-sense structure of the
MAX9621, the device is immune to shifts between the
12
Figure 5. 3-Wire Hall-Effect Switches Configured as 2-Wire
Table 2. A Partial List of Compatible Hall Switches
HAL573-6
HAL556/560/566
HAL579/581/584
A1140/1/2/3
A3161
TLE4941/C
PART NO.
X
MANUFACTURER
Remote Ground
Micronas
Micronas
Micronas
Infineon
Allegro
Allegro
Sleep Mode
V
CC
R
sensor ground, the ground of the MAX9621 and FP. This
ground-shift immunity eliminates the need for a ground-
connection wire, allowing a single-wire interface to the
Hall sensor.
The MAX9621 is optimized for use with 2-wire Hall-effect
switches or with 3-wire Hall-effect switches connected
as 2-wire (Figure 5). When using a 3-wire Hall sensor the
resistor R is chosen so that the current drawn by the Hall
sensor crosses the MAX9621 current threshold when
the magnetic threshold of the Hall sensor is exceeded.
A partial list of Hall switches that can be used with the
MAX9621 is given in Table 2.
To get the best input current threshold precision, it is rec-
ommended that the R
to the BAT pin. A true Kelvin type connection is best.
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Input Current Threshold Precision
IN_
MAX9621
Hall-Effect Sensor Selection
SET
resistor be directly connected
3-wire, optimized for 2-wire
use without added resistor
COMMENTS
2-wire
2-wire
2-wire
2-wire
2-wire