TLI4970-D025T4_15 Datasheet, PDF (18/29 Pages) Infineon Technologies AG – High precision miniature coreless magnetic current sensor for AC

TLI4970-D025T4
Specification
3.3
Fast Over Current Output
The Fast Over Current (OCD) pin allows fast detection of an over current in the measurement path. The OCD
signal path is independent from the bandwidth limited current signal path and has a programmable glitch filter to
avoid false triggers by noise spikes on the current rail. The symmetric threshold level of the OCD output is
adjustable and triggers an over current event in case of a positive or negative over current.
In addition a zero-crossing functionality can be programmed (in this case the over current detection is disabled).
If connected via an external pull-up resistor to a logic input pin of the microcontroller, it can be used to trigger an
interrupt in the microcontroller and quickly shut off the system to avoid damage from the over current event. The
OCD pin has an open-drain output that allows monitoring of several current sensors via only one microcontroller
input pin. For details, please refer to the application circuit shown in Figure 3-2.
The instruction for the settings can be found in the TLI4970 programming guide.
Table 3-4 OCD Output Parameter
General conditions (unless otherwise specified): V_DD = 3.3 V; T_A = -40 °C ... +85 °C
Parameter
Symbol
Values
Unit Note / Test Condition
Min.
Typ. Max.
Threshold level¹⁾
I_THR
6
Accuracy
X_OCD
-
Response time of fast
t_{D_OC}
-
over current detection²⁾³⁾
-
90
20 -
1.8 3.5
A
Programmable (EEPROM)
% I_PFSR
μs
Only valid for ∆I/∆t < 500 kA/s
Load capacitance
C_L
-
-
1
nF
To GND
Open-drain current
I_{OD_on}
-
-
1
mA
Resistive to V_DD;
V_{OD_on} ≤ 0.2 x V_DD
Pull-up resistor
R_PU
4.7
-
-
kΩ
To V_DD
1) Symmetric threshold level for positive and negative currents
2) Falling edge level of OCD-pin <0,5V_DD
3) Characterized in lab under worst case test conditions: R_PU = 4.7kΩ to V_DD; C_L = 1 nF to GND
Data Sheet
18
Rev. 1.0, 2015-07-02