mc33996ek/r2 Freescale Semiconductor, Inc, mc33996ek/r2 Datasheet - Page 12

• Manufacturer Part Number: mc33996ek/r2
• Description: 16-output Switch With Spi Control
• Manufacturer: Freescale Semiconductor, Inc

output being controlled ON. Diagnostics is treated in a similar
manner — outputs with a fault will feedback (via SO) to the
MCU a logic [1], while normal operating outputs will provide a
logic [0].
using a daisy chain configuration or in parallel mode.
Figure 10
33996. Data from the MCU is clocked daisy chain through
each device while the Chip Select bit (
by the MCU. During each clock cycle, output status from the
daisy-chained 33996s is being transferred back to the MCU
via the Master In Slave Out (MISO) line. On rising edge of
data stored in the input register is transferred to the output
driver. Daisy chain control of the 33996 requires 24 bits per
device.
fashion using the SPI.
potentially 32 loads being controlled by two dedicated
parallel MCU ports used for chip select.
12
33996
FUNCTIONAL DESCRIPTION
OPERATIONAL MODES
The 33996 may be controlled and provide diagnostics
Multiple 33996 devices can be controlled in a parallel input
shows the daisy chain configuration using the
Figure
11, page 12, illustrates
CS
) is commanded low
Microcontroller
Shift Register
MC68HCXX
Figure 11. Parallel Inputs SPI Control
Parallel
Ports
CS
PWM2
MOSI
MISO
SCLK
PWM1
,
Microcontroller
MC68HCXX
Shift Register
Parallel
Figure 10. 33996 SPI System Daisy Chain
Ports
SI
SO
SCLK
CS
PWM
RST
SI
SO
SCLK
CS
PWM
RST
33996
33996
MOSI
MISO
SCLK
PWM1
PWM2
Analog Integrated Circuit Device Data
Freescale Semiconductor
SI
SO
SCLK
CS
PWM
RST
SI
SO
SCLK
CS
PWM
RST
33996
33996