Infineon XENSIV TLI4971 - Interface Description; Command Structure; Read; Write Command

Application Note 3 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
1 Application and Programming circuit
The sensor has implemented a serial interface to set the EEPROM content. This chapter describes the hardware
environment to program the device. Further, it shows the recommended circuit for a three-phase GPD
application.
R3 4k7
AOUT
OCD2
VDD
GND
VDC_Link
PGND
VAREF
A/D
A/D
A/D
A/D
EN
VCC_IO
6
Gate-
Driver
µC
Load
VREF
OCD1
VCC_IO
IP+ IP-
VCC_IO
220nF
4k7
1nF/50V
TLI4971
A/D
A/D
4k7
1nF/50V
GPIO
VAREF
PWM
AGND
AGND
GPIO
6.8nF/50V 6.8nF/50V 6.8nF/50V 6.8nF/50V 6.8nF/50V6.8nF/50V
R1
R2
C1
C2
C3 C4 C5 C6
C7
C8
C9
Controll path
Protection path
V
Sens
VCC_IO
LDO
IN
OUT
VS
Tracker
IN
OUT
VS
adj
V
Sen s
GPIO
Figure 1 TLI4971 3-phase GPD application circuit for semi and or fully- differential mode
The protection functionality is covered by two open drain outputs (OCD1 and OCD2) to indicate an overload
and to protect the system in case of an over current event. The OCD1 output shut down the HV gate-driver. The
OCD2 connect to an interrupt input of the microcontroller.
1.1 Circuit / Precondition
Each device can be set separately via the SICI-one wire interface.
In order to communicate with the sensor via the SICI one wire interface the A
OUT
lines of each sensor need to
connect to a microcontroller.
As a first step of the programming procedure, the parameter set has to download into the volatile memory area
of the sensor via the SICI interface.
In a second step, the parameter needs to get stored into the EEPROM by sending the programming command
and applying the programming voltage on OCD2 pin.
OCD2 and V
DD
need to be controlled by the programmer.