Infineon XENSIV TLI4971 - Page 16

Application Note 16 of 31 Rev. 1.30
2022-03-01
Current Sensor TLI4971
Programming Guide and User Manual
d13
13
6500
d14
14
7000
d15
15
7500
OCD1
en
14
rw
The over-current detection enable bit 1 activates the over-current
functionality of channel 1. If this bit set to zero the OCD pin 1 will not
indicate an internal failure or an over-current event. The standard setting is
1 = enabled
1
OCD2
en
15
rw
The over-current detection enable bit 2 activates the over-current
functionality of channel 2. If this bit set to zero the OCD pin 2 will not
indicate an internal failure or an over-current event. The standard setting is
1 = enabled
1
Table 10 Functional description Address 41
hex
Bit field
name
Bit
Type
Bit field description
Default
value
OCD
comp_hyst
3:0
rw
OCD release point: Standard setting out of range 0
hex
.. F
hex
:
 3
hex
for 25A- and 75A-full-scale-variant
 6
hex
for 50A- and 120A-full-scale-variant
Calculated thresholds for 120A-full-scale-variant:
OCD1
thresh
= 120 A * 1.25 = 150 A
OCD1
rel_thresh
= OCD1
thresh
* ( 1 – ( OCD
comp_hyst_setting
/ OCD1
thrsh_setting
) ) =
= 150 A * ( 1 – ( 6
hex
/ 13
hex
) ) = 103 A
OCD2
thresh
= 120 A * 0.82 = 98 A
OCD2
rel_thresh
= OCD2
thresh
* ( 1 – ( OCD
comp_hyst_setting
/ OCD2
thrsh_setting
) ) =
= 98 A * ( 1 – ( 6
hex
/ 1B
hex
) ) = 77 A
Calculated thresholds for 75A-full-scale-variant:
OCD1
thresh
= 75 A * 1.25 = 94 A
OCD1
rel_thresh
= 94 A * ( 1 – ( 3
hex
/ 0A
hex
) ) = 66 A
OCD2
thresh
= 75 A * 0.82 = 62 A
OCD2
rel_thresh
= 62 A * ( 1 – ( 3
hex
/ 0F
hex
) ) = 49 A
Calculated thresholds for 50A-full-scale-variant:
OCD1
thresh
= 50 A * 1.25 = 63 A
OCD1
rel_thresh
= 63 A * ( 1 – ( 6
hex
/ 14
hex
) ) = 44 A
OCD2
thresh
= 50 A * 0.82 = 41 A
OCD2
rel_thresh
= 41 A * ( 1 – ( 6
hex
/ 1C
hex
) ) = 32 A
Calculated thresholds for 25A-full-scale-variant:
OCD1
thresh
= 25 A * 1.25 = 31 A
OCD1
rel_thresh
= 31 A * ( 1 – ( 3
hex
/ 07
hex
) ) = 18 A
OCD2
thresh
= 25 A * 0.82 =21 A
OCD2
rel_thresh
= 21 A * ( 1 – ( 3
hex
/ 0B
hex
) ) = 15 A
0x1x
OCD1
thrsh
9:4
rw
Threshold level of OCD1
Symbol
Setting
level
x FS
S1
S2
S3
S4
S5
S6
I
THR1.1
1.25
13
hex
*)
0F
hex
0A
hex
*)
14
hex
*)
0D
hex
07
hex
*)
I
THR1.2
1.39
16
hex
11
hex
0B
hex
17
hex
0F
hex
09
hex
I
THR1.3
1.54
19
hex
14
hex
0D
hex
1A
hex
12
hex
0A
hex
I
THR1.4
1.68
1C
hex
16
hex
0F
hex
1D
hex
14
hex
0C
hex
I
THR1.5
1.82
1E
hex
18
hex
11
hex
20
hex
16
hex
0D
hex
I
THR1.6
1.96
21
hex
1B
hex
12
hex
23
hex
18
hex
0F
hex
I
THR1.7
2.11
24
hex
1D
hex
14
hex
26
hex
1B
hex
10
hex
I
THR1.8
2.25
27
hex
1F
hex
16
hex
29
hex
1D
hex
12
hex
*)
Standard setting datecode 2118 and later
xxxxxx
OCD2
thrsh
15:10
rw
Threshold level of OCD2
xxxxxx