33982B Datasheet, PDF (19/34 Pages) Freescale Semiconductor, Inc – Single Intelligent High-Current Self-Protected Silicon High-Side Switch (2.0 mohm)

FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
Table 7. Device Behavior in Case of Undervoltage
SPSS
(VPWR Batter Voltage) ∗∗
State
UV Enable UV Enable UV Enable UV Enable
IN=0
IN=0
IN=1
IN=1
(Falling VPWR) (Rising VPWR) (Falling VPWR) (Rising VPWR)
UV Disable
IN=X
(Falling or
Rising
VPWR)
VPWR > VPWRUV
Output State
OFF
OFF
ON
OFF
OFF
FS State
1
1
1
0
1
SPI Fault Register UVF Bit
0
1 until next read
0
1
0
VPWRUV > VPWR > UVPOR Output State
OFF
OFF
OFF
OFF
OFF
FS State
0
0
0
0
1
SPI Fault Register UVF Bit
1
1 until next read
1
1
0
UVPOR > VPWR > 2.5 V∗ Output State
OFF
OFF
OFF
OFF
OFF
FS State
1
1
1
1
1
SPI Fault Register UVF Bit 1 until next read 1 until next read 1 until next read 1 until next read
0
2.5 V > VPWR > 0V
Output State
OFF
OFF
OFF
OFF
OFF
FS State
1
1
1
1
1
SPI Fault Register UVF Bit _{1 until next read 1 until next read 1 until next read 1 until next read}
0
Comments
∗ Typical value; not guaranteed
∗∗ While VDD remains within specified range.
UV fault is
not latched
UV fault is
not latched
UV fault
is latched
REVERSE BATTERY
The output survives the application of reverse voltage as
low as -16 V. Under these conditions, the output’s gate is
enhanced to keep the junction temperature less than 150°C.
The ON resistance of the output is fairly similar to that in the
Normal mode. No additional passive components are
required.
GROUND DISCONNECT PROTECTION
In the event the 33982B ground is disconnected from load
ground, the device protects itself and safely turns OFF the
output regardless the state of the output at the time of
disconnection. A 10 k resistor needs to be added between
the wake pin and the rest of the circuitry in order to ensure
that the device turns off in case of ground disconnect and to
prevent this pin to exceed its maximum ratings.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33982
19