Infineon XENSIV TLI4971 - Interface Timing Definition; Definition of Voltage Levels

Application Note 9 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
2.4 Interface Timing Definition
Table 1 Interface timing
Parameter
Symbol
Min.
Typ.
Max.
Unit
Notes
Interface enable time
t
IFen
100
150
400
µs
Drive A
OUT
to GND
Period time of 1 bit
T
40
t
1
+t
2
7500
µs
One communication frame consist of
16 x 2 bits (16bits write / 16bits read)
Low time sending 0
t
1_0
28
33
38
% of T
Drive A
OUT
to GND
Low time sending 1
t
1_1
62
67
72
% of T
Drive A
OUT
to GND
High time sending 0
t
2_0
T-t
1_0
µs
The device drives A
OUT
to V
DD
by
default.
High time sending 1
t
2_1
T-t
1_0
µs
The device drives A
OUT
to V
DD
by
default.
Low time before read
t
3
10
-
30
% of t
4
Drive A
OUT
to GND
t
4
= 2 * ABS(t
1_x
- t
2_x
)
t
3
can be set as applicable. Increase of
t
3
will reduce sensor response time t
4
.
Therefore t
r
has to be set accordingly
Reading time
t
r
50
-
80
% of t
4
The device drives A
OUT
to V
DD
by
default. Set the external controller in
tri state.
Response time
t
4
2 abs(t
1_x
-t
2_x
)
-
-
µs
t
3
can be set as applicable. Increase
of t
3
will reduce the response time t
4
.
Time between 2 bits
t
5
1
T-t
4
5400
µs
Max high time
t
high
1
-
5400
µs
Only valid for a single bit high time.
There is no restriction in timing
between two commands
Min low time
t
low
1
-
5400
µs
 There is no timing restriction between two commands as long as the A
OUT
pin is not driven to GND.
 The typical threshold level to detect a logic “0” during a high to low transition is 1.3V.
 The typical threshold level to detect a logic “1” during a low to high transition is 1.6V.
2.5 Definition of Voltage Levels
Table 2 SICI High and low level definition
Parameter
Symbol
Min.
Typ.
Max.
Unit
comment
Voltage level for SICI – High
1)
V
SICI_High
1.6
3.3
3.5
V
high state
Voltage level for SICI – Low
2)
V
SICI_Low
-0.3
0
1.3
V
low state