TLE4976-1K Datasheet, PDF (10/18 Pages) Infineon Technologies AG – High Precision Hall Effect Switch with Current Interface

3
Specification
TLE4976-1K
TLE4976L
Specification
3.1
Application Circuit
The advantage of the current interface is, that only two wires are necessary to connect the sensor.
At least one series resistor is required to convert the two output states of the Hall sensor from current consumption
to a voltage information.
A typical value for R_L is 100Ω. This gives a typical signal voltage level V_SIG = 0.8V in the Off state and 1.4V in the
On state.
If the sensor is operated in an application environment with disturbances on the supply line, an additional series
resistor R_S is recommended. The maximum value for the series resistor R_S can be calculated using the following
formula:
R_Smax = ^V----^S---^u---^p--^p_I---_Sl-^y-_h--^m-_i-_g--ⁱ-_hn--_m--^–--_a--^V_x----^S---^m----ⁱ-ⁿ- – R_L
V_{S_min} is the minimal supply voltage which might occur due to disturbances on the supply line V_S.
Example: V_Supplymin = 6V; V_Smin = 3V; R_L = 100Ω; I_Shighmax = 17mA : R_Smax = 76.5Ω
V S uppl y
R_S
4.7 nF
VS
TLE
4976x
GND
µC
V_SIG
Input
RL
µC GND
Figure 7 Application Circuit
Data Sheet
8
Rev. 2.0, 2009-02-12