US1881 Datasheet, PDF (7/11 Pages) List of Unclassifed Manufacturers – CMOS MULTI-PURPOSE LATCH

9 Application Information
9.1 Typical Three-Wire Application Circuit
US1881
9.2 Two-Wire Circuit
Note:
With this circuit, precise ON and OFF
currents can be detected using only two
9.3 Automotive and Harsh, Noisy Environments ^{connecting wires.}
Three-Wire Circuit
The resistors RL and Rb can be used to
bias the input current. Refer to the part
specifications for limiting values.
B_RP : I_OFF = I_R + I_DD = V_DD/R_b + I_DD
B_OP : I_ON = I_OFF + I_OUT = I_OFF + V_DD/R_L
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
Pins
1
SO
Pins
1
Pin
Name
VDD
3
2 OUT
2
3 VSS
Type
Supply
Output
Ground
Description
Power Supply pin
Hall output pin
(clamped)
Ground pin
3901001881
Rev. 014
Page 7 of 11
Jun/05