Infineon XENSIV TLI4971 - How to connect the sensor in a 5 V domain; Single-Ended Mode; Semi and or Fully-differential Mode

Application Note 26 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
6 How to connect the sensor in a 5V domain
This chapter gives a proposal how to connect the 3.3V sensor device with a 5V microcontroller.
Table 16 Electric parameter for application circuit
Name
Value
Unit
Capacitor on VDD
220
nF
Capacitor on analog outputs
6.8
nF
Pull up resistor on OCDs
4.7
kΩ
6.1 Single-Ended Mode
The open drain output of the OCD2 can be connected via the pull up resistor to the 5V.
The OCD1 has to be separated from the 5V with a level shifter since the maximum voltage is limited to 3.6V.
V
REF
V
5V
V
5V
V
5V
ADC
V
REF
µC
TLI4971
VDD
OCD1
OCD2
VREF
AOUT
GND
V
3V3
LDO
out
supply
V
5V
V
3V3
VDD
V
AREF
GPIO
GPIO
In
Figure 21 TLI4971 3.3 to 5V topology approach for single-ended mode
6.2 Semi and or Fully-differential Mode
In order to connect the sensor within a 5V environment an amplifier for each analog output can be part of the
signal conditioning circuit as shown Figure 22.
V
5V
V
5V
ADC
V
REF
µC
TLI4971
VDD
OCD1
OCD2
VREF
AOUT
GND
GPIO
GPIO
V
3V3
in
out
adj
V
5V
V
3V3
In
VDD
V
REF
Figure 22 TLI4971 in fully differential mode (using two ADC input)