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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
MCU INTERFACE DESCRIPTION
In operation, the 33880 functions as an eight-output serial
switch serving as a microcontroller (MCU) bus expander and
buffer, with fault management and fault reporting features. In
doing so, the device directly relieves the MCU of the fault
management functions. This device directly interfaces to an
MCU using a Serial Peripheral Interface (SPI) for control and
Master In Slave Out (MISO) line. On rising edge of CS data
stored in the input register is then transferred to the output
driver.
SCLK
Parallel Port
illustrate the basic SPI configuration between an MCU and
one 33880.
MC68xx
MCU
with
MISO
CS
DO
DI
CS SCLK
DO DI
CS SCLK
DO DI
MC68HCxx
Microcontroller
MOSI
DI
33880
SPI
Interface
33880
8 Outputs
33880
8 Outputs
33880
8 Outputs
Shift Regist er
Receive
Buffer
Parallel
Ports
MISO
SCLK
CS
DO
Shift Register
To
Logic
MOSI
Figure 22. 33880 SPI System Daisy Chain
Multiple 33880 devices can be controlled in a parallel input
fashion using the SPI. Figure 23 illustrates 24 loads being
controlled by three dedicated parallel MCU ports used for
chip select.
Figure 21. SPI Interface with Microcontroller
All inputs are compatible with 5.0 V and 3.3 V CMOS logic
levels and incorporate positive logic. Whenever an input is
MOSI
SCLK
MISO
DI
SCLK
DO
CS
8 Outputs
programmed to a logic low state (<0.8 V) the corresponding
output will be OFF. Conversely, whenever an input is
programmed to a logic high state (>2.2 V), the output being
controlled will be ON. Diagnostics are treated in a similar
MC68xx
Microcontroller
SPI
DI
SCLK
manner. Outputs with a fault will feedback (via DO) to the
microcontroller as a logic [1] while normal operating outputs
will provide a logic [0].
DO
CS
8 Outputs
A
B
C
Figure 22 illustrates the Daisy Chain configuration using
the 33880. Data from the MCU is clocked daisy chain through
each device while the Chip Select ( CS ) bit is commanded low
by the MCU. During each clock cycle output status from the
daisy chain, the 33880 is being transferred to the MCU via the
Parallel
Ports
DI
SCLK
DO
CS
Figure 23. Parallel Input SPI Control
8 Outputs
33880
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
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