MAX9621AUB+ Maxim Integrated Products, MAX9621AUB+ Datasheet - Page 11

• 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

Figure 4. Hall Input Reenergized When Open Input Is Reconnected to Hall Sensor
The MAX9621 features an active-low SLEEP input. Pull
SLEEP low for more than 40Fs to put the device into
sleep mode for power saving. In sleep mode, the DOUT1
and DOUT2 outputs are high impedance and are pulled
high by pullup resistors. AOUT1 and AOUT2 are set to
zero-output current.
When an input has been shut down due to a short to
ground, cycle SLEEP for 10Fs to 20Fs to restart the input.
If the other input is operational it is not affected. The
restart happens on the rising edge of SLEEP.
The input current high and low thresholds that determine
the logic level of the digital outputs are adjusted by
changing the R
the following parameters change as well: I
t
I
portional to R
inverse relationship is linear. For example, a 10% change in
(1/R
Conversely, time and delay parameters are linear and
directly proportional to R
results in an 10% change in time parameters.
The difference between the maximum and minimum
threshold current limits is the min/max limit spread, which
is greater than the threshold hysteresis. The min/max
spread and the hysteresis both change by the same per-
centage as the mean of the threshold current limits. The
following equation is useful for finding the mean of the
threshold current limits given a value of R
IH
BL
, I
, t
SET
IL
Dual, 2-Wire Hall-Effect Sensor Interface with
RAMP
, I
) results in a 10% change in current parameters.
IN_HYS
, t
DEL
SET
, I
SET
, f
SC
and decrease as R
MAX,
Input Current Thresholds and
V
value. When the R
I
, t
IN_
IN_
11.5mA
RAMP
14V
Sleep Mode Input (SLEEP)
and P
0V
0A
SET
, and f
, and a 10% change in R
R
.
V
BAT
MAX
8V
- 25mV
Short to Ground
SET
SET
Hall Input Restart
are inversely pro-
value changes,
SET
increases. This
IN_HYS
resistance:
5mA/µs
, I
Analog and Digital Outputs
SET
SC
HALL INPUT RECONNECTED
TO HALL SENSOR
,
I is the mean of the threshold current limits, R is
the value of the R
I
(1/(kΩ x mA)).
The following equation is useful for finding the value of
R
limits:
To compute the typical input current thresholds from the
mean input current, it is necessary to obtain the hyster-
esis. The following equation finds the hysteresis given
the mean threshold current, I:
where H
Input current threshold high = I - H/2, input current
threshold low = I + H/2.
The digital output can be used to provide the FP with an
interrupt signal that can represent a Hall sensor change
of status. DOUT1 and DOUT2 provide a time domain
output filter for robust noise immunity. See Figure 2.
The analog output can be connected to an ADC with an
appropriate load resistor, and can be used to perform
custom diagnostics.
0
SET
= 0.03717mA, and the constant m = -0.001668
resistance given a mean of the threshold current
0
= -0.033463 in mA, and k = -0.08414 in mA/mA.
Y
0
Use of Digital and Analog Outputs
= 6.2013 x 10
V
BAT
H = H
Application Information
- 500mV
Y
I I
SET
=
=
0
Y
0
0
+
resistance in kΩ, the constant
R
+ k x I (I < 0)
R m
+
m I I 0
=
×
1
-5
Y
1
×
units of (1/kΩ)
(
I
(
<
<
TIME
TIME
0
)
)
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