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MCZ33811EG Arkusz danych(PDF) 10 Page - Freescale Semiconductor, Inc |
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MCZ33811EG Arkusz danych(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 18 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor 33811 ELECTRICAL CHARACTERISTICS MICROCONTROLLER PARAMETRICS MICROCONTROLLER PARAMETRICS SPI - MCU INTERFACE DESCRIPTION The 33811 device directly interfaces to a 3.3V or 5.0V micro controller unit (MCU) using 16 bit Serial Peripheral Interface (SPI) protocol. SPI serial clock frequencies up to 3.2MHz may be used when programming and reading output status information (production tested at 3.2MHz). Figure 5 illustrates the serial peripheral interface (SPI) configuration between an MCU and one 33811. Command data is sent to the 33811 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 data received by the MCU during SPI communication depends on the previous SPI message sent to the device. Next SO response data is listed at the bottom of each command table. SPI Integrity Check Checking the integrity of the SPI communication with the initial power-up of the VDD and RESET pins is recommended. After initial system start-up or reset, the MCU will write one 16-bit pattern to the 33811. The first 8 bits read by the MCU will be the fault status (SO message 1) of the outputs. The second 8 bits will be the same bit pattern sent by the MCU. By the MCU receiving the same bit pattern it sent, bus integrity is confirmed. The second 16-bit pattern the MCU sends to the device is the a command word and will be operated on by the device accordingly on rising edge of CS. Important A SCLK pulse count strategy has been implemented to ensure integrity of SPI communications. SPI messages consisting of 16 SCLK pulses and multiples of 8 clock pulses thereafter will be acknowledged. SPI messages consisting of other than 16 + multiples of 8 SCLK pulses will be ignored by the device. Figure 5. SPI Interface with Microprocessor Two or more 33811 devices may be used in a module system. Multiple ICs may be SPI-configured in parallel or serial. Figures 6 shows the configurations. When using the serial configuration, 32-clock cycles are required to transfer data in/out of the ICs. Figure 6. SPI Parallel Interface with Microprocessor 33811 Microcontroller Receive Buffer Parallel Ports Fault Bits 16-Bit Shift Register Shift Register MOSI SI MISO SO SCLK CS Parallel Ports Microcontroller 33811 33811 SI SCLK CS SI SO SCLK CS SCLK MISO MOSI Shift Register SO |
Podobny numer części - MCZ33811EG |
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Podobny opis - MCZ33811EG |
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