mc33984 Freescale Semiconductor, Inc, mc33984 Datasheet - Page 20

• Manufacturer Part Number: mc33984
• Description: Dual Intelligent High-current Self-protected Silicon High-side Switch 4.0 M
• Manufacturer: Freescale Semiconductor, Inc

GROUND DISCONNECT PROTECTION
ground, the device protects itself and safely turns OFF the
output regardless the state of the output at the time of
.
Table 7. Device Behavior in Case of Undervoltage
20
33984
FUNCTIONAL DEVICE OPERATION
VPWR > VPWRUV
VPWRUV > VPWR > UVPOR Output State
UVPOR > VPWR > 2.5 V ∗
2.5 V > VPWR > 0V
∗ = Typical value; not guaranteed
∗∗ = While VDD remains within specified range.
(VPWR Batter Voltage) ∗∗
In the event the 33984 ground is disconnected from load
SPD4
Output State
FS State
SPI Fault Register UVF Bit
FS State
SPI Fault Register UVF Bit
Output State
FS State
SPI Fault Register UVF Bit 1 until next read 1 until next read 1 until next read 1 until next read
Output State
FS State
SPI Fault Register UVF Bit 1 until next read 1 until next read 1 until next read 1 until next read
Comments
State
(Falling VPWR)
UV Enable
not latched
UV fault is
IN=0
OFF
OFF
OFF
OFF
1
0
0
1
1
1
disconnection. A 10K 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
1 until next read
1 until next read
(Rising VPWR)
UV Enable
not latched
UV fault is
IN=0
OFF
OFF
OFF
OFF
1
0
1
1
(Falling VPWR)
UV Enable
IN=1
OFF
OFF
OFF
Analog Integrated Circuit Device Data
ON
1
0
0
1
1
1
(Rising VPWR)
UV Enable
Freescale Semiconductor
is latched
UV fault
IN=1
OFF
OFF
OFF
OFF
0
1
0
1
1
1
UV Disable
(Falling or
VPWR)
Rising
IN=X
OFF
OFF
OFF
OFF
1
0
1
0
1
0
1
0