MCZ33975EK Freescale Semiconductor, MCZ33975EK Datasheet - Page 15

• Manufacturer Part Number: MCZ33975EK
• Description: IC DETECTOR MULT SWITCH 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33975EK

• Applications: Automotive
• Interface: SPI
• Voltage - Supply: 5.5 V ~ 28 V
• Package / Case: 32-SOIC (7.5mm Width) Exposed Pad, 32-eSOIC, 32-HSOIC
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

microcontroller unit (MCU). SPI serial clock frequencies up to
6.0MHz may be used for programming and reading switch
input status (production tested at 4.16MHz).
illustrates the configuration between an MCU and one 33975.
device through the SI input pin. As data is being clocked into
the SI pin, status information is being clocked out of the
device by the SO output pin. The response to a SPI
command will always return the switch status, reset flag, and
thermal flag. Input switch states are latched into the SO
register on the falling edge of the chip select (
Twenty-four bits are required to complete a transfer of
information between the 33975 and the MCU.
system. Multiple ICs may be SPI-configured in parallel or
serial.
the serial configuration, 48-clock cycles are required to
transfer data in/out of the ICs.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33975 device directly interfaces to a 3.3V or 5.0V
Serial peripheral interface (SPI) data is sent to the 33975
Two or more 33975 devices may be used in a module
Microcontroller
MC68HCXX
Shift Register
Figures 9
Figure 8. SPI Interface with Microprocessor
Receive
Parallel
Buffer
Ports
and
10
MOSI
MISO
SCLK
INT
show the configurations. When using
INT
SO
CS
SI
24-Bit Shift Register
MCU INTERFACE DESCRIPTION
Figure 8
CS
33975
To Logic
) pin.
Figure 9. SPI Parallel Interface with Microprocessor
Figure 10. SPI Serial Interface with Microprocessor
Microcontroller
Microcontroller
MC68HCXX
MC68HCXX
Shift Register
Shift Register
Parallel
Parallel
Ports
Ports
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INT
INT
SCLK
MOSI
MISO
SCLK
MOSI
MISO
FUNCTIONAL DESCRIPTIONS
SI
SCLK
CS
INT
SI
SO
SCLK
CS
INT
SO
SI
SO
SCLK
CS
INT
SI
SO
SCLK
CS
INT
33975
33975
33975
33975
33975
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