MC33984CHFK FREESCALE [Freescale Semiconductor, Inc], MC33984CHFK Datasheet - Page 22

• Manufacturer Part Number: MC33984CHFK
• Description: Dual Intelligent High-current Self-protected Silicon High Side Switch (4.0 mOhm)
• Manufacturer: FREESCALE [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 8. Device Behavior in Case of Under-voltage
22
33984
FUNCTIONAL DEVICE OPERATION
(VPWR Battery
VPWR >
VPWRUV
VPWRUV >
VPWR >
UVPOR
UVPOR >
VPWR > 2.5 V ∗
2.5 V > VPWR >
0 V
∗ Typical value; not guaranteed
∗∗ While VDD remains within specified range.
∗∗∗ = IN is equivalent to IN direct input or IN_spi SPI input.
In the event the 33984 ground is disconnected from load
Voltage) ∗∗
High Side
Switch
Output State
FS State
SPI Fault
Register UVF
Bit
Output State
FS State
SPI Fault
Register UVF
Bit
Output State
FS State
SPI Fault
Register UVF
Bit
Output State
FS State
SPI Fault
Register UVF
Bit
Comments
State
(Falling VPWR)
1 until next read
1 until next read 1 until next read 1 until next read 1 until next read
UV Enable
not latched
UV fault is
IN = 0
OFF
OFF
OFF
OFF
1
0
0
1
1
1
1 until next read
(Rising VPWR)
UV Enable
not latched
UV fault is
IN = 0
OFF
OFF
OFF
OFF
1
0
1
1
1
1
(Falling VPWR)
1 until next read 1 until next read
UV Enable
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 from exceeding its maximum ratings
IN∗∗∗ = 1
OFF
OFF
OFF
ON
1
0
0
1
1
1
(Rising VPWR)
UV Enable
IN∗∗∗ = 1
is latched
UV fault
OFF
OFF
OFF
OFF
0
1
0
1
1
1
Analog Integrated Circuit Device Data
Rising VPWR)
UV Disable
(Falling or
IN = 0
OFF
OFF
OFF
OFF
Freescale Semiconductor
1
0
1
0
1
0
1
0
Rising VPWR)
UV Disable
(Falling or
IN∗∗∗ = 1
OFF
ON
ON
ON
1
0
1
0
1
0
1
0