New miniature package / thin, high reliability package
Operation down to 2.2V
CMOS for optimum stability, quality, and cost
Low I
DD
current
Applications
Solid state switch
Brushless DC motor commutation
Speed sensing
Ordering Information
Part No.
US4881
US4881
Temperature Suffix
Package
Temperature Range
E
SO or UA
-40 to 85
o
C Extended
L
SO or UA
-40 to 150
o
C Automotive
Contact factory or sales representative for legacy temperature code options
y
r
a
in
im
l
e
r
P
Functional Diagram
Description
The US4881 is a bipolar Hall effect sensor IC fab-
ricated from mixed signal CMOS technology. It
incorporates advanced chopper stabilization tech-
niques to provide accurate and stable magnetic
switch points. There are many applications for
this HED in addition to those listed above. The
design specifications and performance have been
optimized for commutation applications in brush-
less DC motors and automotive speed sensing.
The output transistor will be latched on (B
OP
) in
the presence of a sufficiently s
trong South pole
magnetic field facing the marked side of the pack-
age. Similarly, the output will be latched off (B
RP
)
in the presence of a North field.
SO Package
Pin 1 - V
D D
Pin 2 - Output
Pin 3 - GND
V
DD
Output
Voltage
Regulator
Chopper
GND
UA Package
Pin 1 - V
D D
Pin 2 - GND
Pin 3 - Output
The SOT-23 device is reversed from the UA
package. The SOT-23 output transistor will be
latched on (B
OP
) in the presence of a sufficiently
strong North pole magnetic field subjected to the
marked face.
Note:
Static sensitive device; please observe ESD precautions. Re -
verse V
DD
protection is not included. For reverse voltage protec -
tion, a 100Ω resistor in series with V
DD
is recommended.
US4881 CMOS Low Voltage High Sensitivity Latch
3901004881 Rev 1.5
24/July/01
Page 1
US4881
CMOS Low Voltage High Sensitivity Latch
US4881 Electrical Specifications
DC operating parameters: T
A
= 25
o
C, V
DD
= 12V
DC
(unless otherwise specified).
Parameter
Supply Voltage
Supply Current
Saturation Voltage
Output Leakage
Output Rise Time
Output Fall Time
Symbol Test Conditions
V
DD
Operating
I
DD
V
DS(on)
I
OFF
t
r
t
f
B<B
OP
I
OUT
= 20 mA, B>B
OP
B<B
RP
, V
OUT
= 18V
V
DD
= 12V, R
L
= 1.1KÙ, C
L
= 20pf
V
DD
= 12V, R
L
= 1.1KÙ, C
L
= 20pf
Min
2.2
1.5
Typ
2.5
0.4
0.01
0.04
0.18
Max
18
4.0
0.5
5.0
Units
V
mA
V
ìA
ìs
ìs
US4881 Magnetic Specifications
DC operating parameters: T
A
= 25
o
C, V
DD
=12 V
DC
(unless otherwise specified).
Parameter
Operating Point
Release Point
Hysteresis
Symbol Test Conditions
B
OP
B
RP
B
hys
Min
0.5
-4.5
2.0
Typ
2.0
-2.0
4.0
Max
4.5
-0.5
6.5
Units
mT
mT
mT
Note:
1 mT = 10 Gauss.
Absolute Maximum Ratings
Supply Voltage (Operating), V
DD
Supply Current (Fault), I
DD
Output Voltage, V
OUT
Output Current (Fault), I
OUT
Power Dissipation, P
D
Operating Temperature Range, T
A
Storage Temperature Range, T
S
Maximum Junction Temp, T
J
ESD Sensitivity (All Pins)
18V
50mA
18V
50mA
100mW
-40 to 150°C
-65 to 150°C
175°C
+/- 4KV
Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function o r design. Melexis does
not assume any liability arising from the use of any product or application of any product or circuit described herein.
US4881 CMOS Low Voltage High Sensitivity Latch
3901004881 Rev 1.5
24/July/01
Page 2
US4881
CMOS Low Voltage High Sensitivity Latch
Preliminary Datasheet
Performance Graphs
Typical Magnetic Switch Points
versus
Supply Voltage
12.5
Typical Magnetic Switch Points
versus
Temperature
12
B
HYS
4881
4881
7.5
B
OP
7.5
Flux Density (mT)
Flux Density (mT)
B
OP
2.5
2.5
-2.5
-2.5
B
RP
-7.5
-7.5
B
RP
-12.5
0
5
10
15
20
25
30
-12.5
-40
0
40
80
120
160
200
Supply Voltage (V)
Temperature (
o
C)
Min/Max Magnetic Switch
Range
versus
Temperature
12.5
Output Voltage
versus
Flux Density
4881
30
4881
7.5
B
OP
Max
24
Flux Density (mT)
Output Voltage (V)
V
DD
18
2.5
B
OP
Min
B
OP
12
-2.5
B
RP
Max
-7.5
B
RP
Min
6
B
RP
V
out
-12.5
-40
0
40
80
120
160
200
0
-30
-20
-10
0
10
20
30
Temperature (
o
C)
Flux Density (mT)
US4881 CMOS Low Voltage High Sensitivity Latch
3901004881 Rev 1.5
24/July/01
Page 3
US4881
CMOS Low Voltage High Sensitivity Latch
Performance Graphs
Typical Supply Current
versus
Supply Voltage
5
Typical Saturation Voltage
versus
Temperature
V
DD
= 12 V, I
OUT
= 20mA
4881
500
4881
4
400
V
DS(ON)
Supply Current (mA)
T
A
= -40
o
C
3
T
A
= 25
o
C
2
T
A
= 125
o
C
V
DS(ON)
(mV)
20
25
30
300
200
1
100
0
0
5
10
15
0
-40
0
40
80
120
160
200
Supply Voltage (V)
Temperature (
o
C)
Power Dissipation
versus
Temperature
500
Wave Soldering Parameters
All Devices
All Devices
280
Package Power Dissipation (mW)
400
260
300
Solder Temperature (
o
C)
200
UA Package
R
θ
JA
=206
o
C/W
240
200
220
100
SO Package
R
θJA
=575
o
C/W
0
-40
0
40
80
120
160
200
0
5
10
15
20
25
30
Temperature (
o
C)
Time in Wave Solder (Seconds)
US4881 CMOS Low Voltage High Sensitivity Latch
3901004881 Rev 1.5
24/July/01
Page 4
US4881
CMOS Low Voltage High Sensitivity Latch
Preliminary Datasheet
Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched
capacitor techniques to eliminate the amplifier
offset voltage, which, in bipolar devices, is a
major source of temperature sensitive drift.
CMOS makes this advanced technique possi-
ble. The CMOS chip is also much smaller than
a bipolar chip, allowing very sophisticated cir-
cuitry to be placed in less space. The small chip
size also contributes to lower physical stress
and less power consumption.
Application Comments
If reverse supply protection is desired, use a re-
sistor in series with the V
DD
pin. The resistor will
limit the Supply Current(Fault), I
DD
, to 50 mA.
For severe EMC conditions, use the application
circuit below.
Installation Comments
Consider temperature coefficients of Hall IC and
magnetics, as well as air gap and life time varia-
tions. Observe temperature limits during wave
soldering.
Applications Examples
Automotive and Severe
Environment Protection Circuit
R
1
100Ω
V
DD
D1
Z1
C1
4.7n
F
Two Wire Optional Current
Biasing Circuit
V
R
L
I
DD
Iout
DD
I
IN
R
L
1.2
K
OUT
C2
4.7n
F
Supply
Voltage
Hall IC
V
SS
R
b
Hall
IC
The resistors R
b
and R
L
can be used to bias the input current, Iin. Refer
to the part specification for limiting values. This circuit will help in getting
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Embedded System
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