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33879 датащи(PDF) 17 Page - Freescale Semiconductor, Inc

номер детали 33879
подробное описание детали  Configurable Octal Serial Switch with Open Load Detect Current Disable
PDF  25 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33879 датащи(HTML) 17 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
17
33879
FUNCTIONAL DESCRIPTION
SPI DEFINITION
Figure 17. Parallel Input SPI Control
SPI DEFINITION
On each SPI communication, a 16-bit command word is
sent to the 33879 and a 16-bit status word is received from
the 33879. The MSB is sent and received first. As Table 6
shows, the Command Register defines the position and
operation the 33879 will perform on rising edge of CS. The
Fault Register, shown in Table 7, defines the previous state
status of the output driver. Table 8 identifies the type of fault
and the method by which the fault is communicated to the
microprocessor.
Table 6. Command Register Definition
0 = Bits 0 to 7, Output commanded OFF.
0 = Bits 8 to 15, Open Load Detection Current OFF.
1 = Bits 0 to 7, Output commanded ON.
1 = Bits 8 to 15 Open Load Detection Current ON.
Table 7. Fault Register Definition
0 = Bits 0 to 7, No Fault at Output.
1 = Bits 0 to 7, Output Short-to-Battery, Short-to-GND,
Open Load, or TLIM.
Bits 8 to 15 will always return “0”.
DI
DI
DI
SCLK
SCLK
SCLK
DO
DO
DO
CS
CS
CS
Parallel
Ports
MOSI
MISO
SCLK
8 Outputs
8 Outputs
8 Outputs
MC68HCxx
Microcontroller
with
SPI Interface
A
B
C
33879
33879
33879
MSB
LSB
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ON/
OFF
Open
Load
Detect
8
ON/
OFF
Open
Load
Detect
7
ON/
OFF
Open
Load
Detect
6
ON/
OFF
Open
Load
Detect
5
ON/
OFF
Open
Load
Detect
4
ON/
OFF
Open
Load
Detect
3
ON/
OFF
Open
Load
Detect
2
ON/
OFF
Open
Load
Detect
1
ON/
OFF
OUT 8
ON/
OFF
OUT 7
ON/
OFF
OUT 6
ON/
OFF
OUT 5
ON/
OFF
OUT 4
ON/
OFF
OUT 3
ON/
OFF
OUT 2
ON/
OFF
OUT 1
MSB
LSB
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
0
0
OUT 8
Status
OUT 7
Status
OUT 6
Status
OUT 5
Status
OUT 4
Status
OUT 3
Status
OUT 2
Status
OUT 1
Status



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