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MCZ33996EKR2 bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33996EKR2 bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 24 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33996 FUNCTIONAL DESCRIPTION OPERATIONAL MODES OPERATIONAL MODES On each SPI communication, a 24 bit command word is sent to the 33996 and 24 bit fault word is received from the 33996. The Most Significant Bit (MSB) is sent and received first. Command Register Definition: 0 = Output Command Off 1 = Output Command On SO Definition: 0 = No fault 1 = Fault MCU INTERFACE DESCRIPTION In operation the 33996 functions as a 16-output serial switch serving as a microcontroller (MCU) bus expander and buffer with fault management and fault reporting features. In doing so, the device directly relieves the MCU of the fault management functions. The 33996 directly interfaces to an MCU and operates at system clock serial frequencies up to 6.0MHz using a Serial Peripheral Interface (SPI) for control and diagnostic readout. Figure 9 shows the basic SPI configuration between an MCU and one 33996. Figure 9. 33996 SPI Interface with Microcontroller All inputs are compatible with 3.3/5.0V CMOS logic levels and incorporate positive logic. An input that is programmed to a logic low state (< 0.8V) will have the corresponding output OFF. Conversely, an input programmed to a logic high state (> 2.2V) will have the output being controlled ON. Table 5. Fault Operation Serial Output (SO) Pins Reports Over-temperature Fault reported by Serial Output (SO) pin. Over-current SO pin reports short to battery/supply or over-current condition. Output “ON’ Open Load Fault Not reported. Output “OFF’” Open Load Fault SO pin reports output “OFF’” open load condition. Device Shutdowns Over-voltage Total device shutdown at VPWR = 27.5 V to 35 V. Resumes normal operation with proper voltage. Upon recovery all outputs assume previous state or OFF based on the Overvoltage bit in the Global Shutdown/Retry Control Register. Over-temperature Only the output experiencing an over-temperature fault shuts down. Output may auto-retry or remain off according to the control bits in the Global Shutdown/Retry Control Register. Over-current Output will remain in current limit 0.9 A to 2.5 A until thermal limit is reached. When thermal limit is reached, device will enter over-temperature shutdown. Output will operate as programmed in the Global Shutdown/Retry Control Register. Fault flag in SO Response word will be set. 33996 MC68HCXX Microcontroller Receive Buffer Parallel Ports To Logic 24-Bit Shift Register Shift Register MOSI SI MISO SO SCLK RST CS PWM |
Số phần tương tự - MCZ33996EKR2 |
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Mô tả tương tự - MCZ33996EKR2 |
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