Datasheet

L9942 Electrical specifications
Doc ID 11778 Rev 7 17/40
3.4.2 Over- and undervoltage detection
Figure 6. VS monitoring
3.4.3 Reference current output
The device works properly without the external resistor at pin REF. In this case it doesn't
have to fulfill all specified parameters.
Table 9. Over- and undervoltage detection
Symbol Parameter Test condition Min. Typ. Max. Unit
V
SUV ON
V
S
UV-threshold voltage V
S
increasing - - 6.90 V
V
SUV OFF
V
S
UV-threshold voltage V
S
decreasing 4.8 - - V
V
SUV hyst
V
S
UV-hysteresis V
SUV ON
-V
SUV OFF
-0.3 - V
V
SOV OFF
V
S
OV-threshold voltage V
S
increasing - 21 25 V
V
SOV ON
V
S
OV-threshold voltage V
S
decreasing 18.5 20 - V
V
SOV hys
t V
S
OV-hysteresis V
SOV OFF
-V
SOV ON
-0.5 - V
V
POR OFF
Power-off-reset threshold V
CC
increasing - 2.6 2.9 V
V
POR ON
Power-on-reset threshold V
CC
decreasing 2.00 2.3 - V
V
POR hyst
Power-on-reset hysteresis V
POR OFF
-V
POR ON
-0.11 - V
Register 7
UV
1
0
VS
VSUV ONVSUV OFF
Register 7
OV
1
0
VS
VSOV OFFVSOV ON
Table 10. Reference current output
Symbol Parameter Test condition Min. Typ. Max. Unit
V
REF
Reference voltage range I
REF
= -200 A 1.05 1.25 1.45 V
I
REFshorted
Reference current
threshold shorted pin REF
register6 bit7 RERR = 1 - - -250 A
I
REFopen
Reference current
threshold open pin REF
register6 bit7 RERR = 1 -150 - - A