MC33879APEK Freescale Semiconductor, MC33879APEK Datasheet - Page 16

• Manufacturer Part Number: MC33879APEK
• Description: CONFIG OCTAL SERIAL SW
• Manufacturer: Freescale Semiconductor

sent to the 33879 and a 16-bit status word is received from
the 33879. The MSB is sent and received first. As
shows, the Command Register defines the position and
operation the 33879 will perform on rising edge of
Table 6. Command Register Definition
Table 7. Fault Register Definition
Open Load, or T
Table 8. Fault Operation
16
33879
FUNCTIONAL DESCRIPTION
SPI DEFINITION
Serial Output (DO) Pin Reports
Device Shutdowns
Detect
Bit 15
Bit 15
Open
Over-temperature
Over-current
Output ON Open Load Fault
Output OFF Open Load Fault
Over-voltage
Over-temperature
MSB
Load
MSB
ON /
OFF
On each SPI communication, a 16-bit command word is
0 = Bits 0 to 7, Output commanded OFF.
0 = Bits 8 to 15, Open Load Detection Current OFF.
0 = Bits 0 to 7, No Fault at Output.
1 = Bits 0 to 7, Output Short-to-Battery, Short-to-GND,
8
0
Detect
Bit 14
Bit 14
Open
Load
ON /
OFF
7
0
LIM
Detect
Bit 13
Bit 13
Open
Load
ON /
OFF
6
0
.
Detect
Bit 12
Bit 12
Open
Load
ON /
OFF
5
0
Detect
Bit 11
Bit 11
Open
Load
ON /
OFF
4
0
Fault reported by serial output (DO) pin.
DO pin reports short to battery/supply or over-current condition.
Not reported.
DO pin reports output OFF open load condition only with Open Load Detection Current enabled.
DO pin will report “0” for Output OFF Open Load Fault with Open Load Detection Current disabled.
Total device shutdown at V
outputs assuming the previous state upon recovery from over-voltage.
Only the output experiencing an over-temperature shuts down. Output assumes previous state upon
recovery from over-temperature.
Detect
Bit 10
Bit 10
Open
Load
ON /
OFF
3
0
Detect
Open
Load
Bit 9
Bit 9
ON /
OFF
Table
CS
2
0
. The
SPI DEFINITION
Detect
Open
Load
Bit 8
Bit 8
OFF
ON /
1
0
PWR
OUT 8
OUT 8
Status
Bit 7
Bit 7
OFF
ON /
Fault Register, shown in
status of the output driver.
and the method by which the fault is communicated to the
microprocessor
= V
1 = Bits 0 to 7, Output commanded ON.
1 = Bits 8 to 15 Open Load Detection Current ON.
Bits 8 to 15 will always return “0”.
PWR(OV)
OUT 7
OUT 7
Status
Bit 6
Bit 6
OFF
ON /
V. Resumes normal operation with proper voltage. All
OUT 6
OUT 6
Status
Bit 5
Bit 5
OFF
ON /
OUT 5
OUT 5
Status
Bit 4
Bit 4
Analog Integrated Circuit Device Data
OFF
ON /
Table
Table
OUT 4
OUT 4
Status
Bit 3
Bit 3
OFF
ON /
6, defines the previous state
identifies the type of fault
Freescale Semiconductor
OUT 3
OUT 3
Status
Bit 2
Bit 2
ON /
OFF
OUT 2
OUT 2
Status
Bit 1
Bit 1
ON /
OFF
OUT 1
OUT 1
Status
Bit 0
Bit 0
LSB
LSB
ON /
OFF