Infineon XENSIV TLI4971 - Page 8

Application Note 8 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
0
A
OUT
V
DD
(hi-Z)
GND
t
1_1
t
2_2
t
3
t
4
t
5
t
r,min
t
r,max
TT
Figure 7 SICI duty cycle; sending logic '1' to the device; receiving logic '0' from the device
A
OUT
V
DD
OCD
Supply sensor
force A
OUT
to GND
force A
OUT
to V
DD
modulate A
OUT
Send password LSB "1" Read LSB bit "0"
1V/div 2.5ms/div
Figure 8 SICI enter interface sequence
Figure 8 describes the interface activation by modulating the AOUT after startup. The modulation of the first two
bits can be seen in the picture.
A
OUT
V
DD
OCD
1V/div 2.5ms/div
"1" "0" "1" "1" "0" "0" "1" "1" "1" "1" "1""0" "0" "1""0""1"
LSB
MSB
enter interface command = DCBA
hex
|reiceived values all zeros
Figure 9 SICI enter interface command
Figure 9 shows the oscilloscope picture of the enter interface command to activate the sensor interface after
performing the startup sequence.