Infineon XENSIV TLI4971 - Operation Mode; Single-Ended Mode; Fully-differential Mode

Application Note 24 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
5 Operation Mode
The default output mode is semi-differential mode V
OQ
= V
OQbid1
.
5.1 Single-Ended Mode
The sensors reference voltage pin is set as input and supplied by an external reference voltage generation circuit.
The V
REF
input leakage current of up to 20µA has to be considered in the design of the reference voltage generation
circuit.
AOUT[V]
VREF[V]
Ext. VREF
Ext.VREF
t
t
I[A]
0A
Sensor Input (current to measure) Sensor Output Voltage
t
Figure 15 Sensor output signal dependent on input signal waveform in single-ended mode
V
REF
ADC
V
REF
µC
TLI4971
V
3V3
VDD
OCD1
OCD2
VREF
AOUT
GND
V
3V3
V
3V3
V
3V3
GPIO
GPIO
V
AREF
In
V
3V3
Figure 16 TLI4971 connected to µC in single-ended mode
5.2 Fully-differential Mode
In fully differential output mode, both V
REF
and A
OUT
are analog outputs to achieve double voltage swing.
A
OUT
[V]
V
REF
[V]
V
DD
/2
V
DD
/2
t
t
I[A]
0A
Sensor Input (current to measure) Sensor Output Voltage
t
Figure 17 Sensor output signal dependent on input signal waveform in fully differential mode