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MC33972DWB Datasheet(PDF) 11 Page - Motorola, Inc |
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MC33972DWB Datasheet(HTML) 11 Page - Motorola, Inc |
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11 / 28 page  MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 33972 11 MCU INTERFACE DESCRIPTION The 33972 device directly interfaces to a 3.3 V or 5.0 V microcontroller unit (MCU). SPI serial clock frequencies up to 6.0 MHz may be used for programming and reading switch input status (production tested at 4.16 MHz). Figure 5 illustrates the configuration between an MCU and one 33972. Serial peripheral interface (SPI) data is sent to the 33972 device through the SI input terminal. As data is being clocked into the SI terminal, status information is being clocked out of the device by the SO output terminal. The response to a SPI command will always return the switch status, interrupt flag, and thermal flag. Input switch states are latched into the SO register on the falling edge of the chip select (CS) terminal. Twenty-four bits are required to complete a transfer of information between the 33972 and the MCU. Figure 5. SPI Interface with Microprocessor Two or more 33972 devices may be used in a module system. Multiple ICs may be SPI-configured in parallel or serial. Figures 6 and 7 show the configurations. When using the serial configuration, 48-clock cycles are required to transfer data in/ out of the ICs. Figure 6. SPI Parallel Interface with Microprocessor Figure 7. SPI Serial Interface with Microprocessor 33972 MC68HCXX Microcontroller Receive Buffer Parallel Ports To Logic 24-Bit Shift Register Shift Register MOSI SI MISO SO SCLK CS INT INT Parallel Ports MC68HCXX Microcontroller 33972 33972 SI SCLK CS INT SI SO SCLK CS INT INT SCLK MISO MOSI Shift Register SO Parallel Ports MC68HCXX Microcontroller 33972 33972 SI SCLK CS INT SI SO SCLK CS INT SO INT SCLK MISO MOSI Shift Register Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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