US1881 Melexis Microelectronic Systems, US1881 Datasheet - Page 7

• Manufacturer Part Number: US1881
• Description: CMOS MULTI-PURPOSE LATCH
• Manufacturer: Melexis Microelectronic Systems

www.DataSheet4U.com
9 Application Information
9.1
9.3
10 Application Comments
If a weak power supply is used or the chip is intended to be used in noisy environment, it is recommended
that figure 9.3 from the Application Information section is used. R1 and C1 form a RC filter, which bypasses
the disturbances over the supply pin.
If a continuous reverse polarity protection is required for supply voltages above 5 Volts, it is recommended to
use a diode instead of resistor, because the power dissipation demands become higher.
11 Pin Definitions and Descriptions
UA
3901001881
Rev. 014
Pins
1
3
2
Typical Three-Wire Application Circuit
Automotive and Harsh, Noisy Environments
Three-Wire Circuit
Pins
SO
1
2
3
Pin
Name
VDD
OUT
VSS
Ground
Type
Supply
Output
Description
Power Supply pin
Hall output pin
(clamped)
Ground pin
Page 7 of 11
9.2
Note:
With this circuit, precise ON and OFF
currents can be detected using only two
connecting wires.
The resistors RL and Rb can be used to
bias the input current. Refer to the part
specifications for limiting values.
B
B
RP
OP
:
:
Two-Wire Circuit
I
I
OFF
ON
= I
= I
OFF
R
+ I
+ I
DD
OUT
= V
= I
DD
US1881
OFF
/R
+ V
b
+ I
DD
DD
/R
Jun/05
L