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MC33993DWBR2 데이터시트(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC33993DWBR2 데이터시트(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 28 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33993 FUNCTIONAL DEVICE OPERATION FUNCTIONAL PIN DESCRIPTION FUNCTIONAL DEVICE OPERATION MCU INTERFACE DESCRIPTION The 33993 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 7 illustrates the configuration between an MCU and one 33993. Serial peripheral interface (SPI) data is sent to the 33993 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, interrupt flag, and thermal flag. Input switch states are latched into the SO register on the falling edge of the chip select (CS) pin. Twenty-four bits are required to complete a transfer of information between the 33993 and the MCU. Figure 7. SPI Interface with Microprocessor Two or more 33993 devices may be used in a module system. Multiple ICs may be SPI-configured in parallel or serial. Figures 8 and 9 show the configurations. When using the serial configuration, 48-clock cycles are required to transfer data in/out of the ICs. Figure 8. SPI Parallel Interface with Microprocessor Figure 9. SPI Serial Interface with Microprocessor 33993 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 33993 33993 SI SCLK CS INT SI SO SCLK CS INT INT SCLK MISO MOSI Shift Register SO Parallel Ports MC68HCXX Microcontroller 33993 33993 SI SCLK CS INT SI SO SCLK CS INT SO INT SCLK MISO MOSI Shift Register |
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