TLE7209-2R_07 Datasheet, PDF (18/32 Pages) Infineon Technologies AG – 7 A H-Bridge for DC-Motor Applications

TLE 7209-2R
Circuit Description
2.4.2.8 Open-Load Diagnosis
Open-load diagnostic in OFF-state is only possible in the SPI-mode (DMS = 5 V) if the
device is Disabled (EN = L or DIS = H). The detection mechanism is depicted in
Figure 9. The according diagnostic information can be read out via the SPI diagnostic
register. The resulting overall diagnostic truth-table is shown as Table 15
DMS
V_S
V_S
DIS
AND
OR
EN
-
+
1V
1.5mA
OUT1 _OUT2
1mA
-
+
1V
to diagnostic
register
1
AND
Figure 9
Table 15
Functional block diagram of open-load detection
Diagnosis Truth Table for open load detection
Output stage inactive, EN = low or DIS = high, DMS > 4.5 V
OUT1 OUT2
Load available
H
H
Open Load
H
L
OL detected
SC -> GND on OUT1 and Open Load L
L
OL not detected – double Fault
SC -> GND on OUT2 and Open Load H
L
OL detected
SC -> V_S on OUT1 and Open Load H
L
OL detected
SC -> V_S on OUT2 and Open Load H
H
OL not detected – double Fault
Data Sheet
18
Rev. 1.4, 2007-04-05