33982B_09 Datasheet, PDF (21/36 Pages) Freescale Semiconductor, Inc – Single Intelligent High-current Self-protected Silicon High Side Switch (2.0 mΩ)

FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
Table 8. Device Behavior in Case of Under-voltage
High Side
Switch
(VPWR Battery
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 = 0
(Falling or
Rising VPWR)
UV Disable
IN∗∗∗ = 1
(Falling or
Rising VPWR)
VPWR >
Output State
OFF
OFF
ON
OFF
OFF
ON
VPWRUV
FS State
1
1
1
0
1
1
SPI Fault
0
1 until next read
0
1
0
0
Register UVF
Bit
VPWRUV >
Output State
OFF
OFF
OFF
OFF
OFF
ON
VPWR >
UVPOR
FS State
0
0
0
0
1
1
SPI Fault
1
1
1
1
0
0
Register UVF
Bit
UVPOR >
Output State
OFF
OFF
OFF
OFF
OFF
ON
VPWR > 2.5 V ∗
FS State
1
1
1
1
1
1
SPI Fault
1 until next read
1
1 until next read 1 until next read
0
0
Register UVF
Bit
2.5 V > VPWR > Output State
0V
FS State
SPI Fault
Register UVF
Bit
OFF
OFF
OFF
OFF
1
1
1
1
1 until next read 1 until next read 1 until next read 1 until next read
OFF
1
0
OFF
1
0
Comments
UV fault is
not latched
UV fault is
not latched
∗ Typical value; not guaranteed
∗∗ While V_DD remains within specified range.
∗∗∗ = IN is equivalent to IN direct input or IN_spi SPI input.
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 33982 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 kΩ 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
21