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MC33996 датащи(PDF) 9 Page - Motorola, Inc |
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MC33996 датащи(HTML) 9 Page - Motorola, Inc |
9 / 16 page MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 33996 9 SYSTEM/APPLICATION INFORMATION INTRODUCTION The 33996 is designed and developed for automotive and industrial applications. It is a 16-output power switch having 24-bit serial control. The 33996 incorporates SMARTMOS technology having CMOS logic, bipolar/MOS analog circuitry, and independent DMOS power output transistors. Many benefits are realized as a direct result of using this mixed technology. A simplified internal block diagram of the 33996 is shown in Figure 1, page 2. 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 6.0 MHz using a Serial Peripheral Interface (SPI) for control and diagnostic readout. Figure 3 shows the basic SPI configuration between an MCU and one 33996. Figure 3. 33996 SPI Interface with Microcontroller All inputs are compatible with 3.3 V/5.0 V CMOS logic levels and incorporate positive logic. An input that is programmed to a logic low state (< 0.8 V) will have the corresponding output OFF. Conversely, an input programmed to a logic high state (> 2.2 V) will have the output being controlled ON. Diagnostics is treated in a similar manner—outputs with a fault will feedback (via SO) to the MCU a logic [1], while normal operating outputs will provide a logic [0]. The 33996 may be controlled and provide diagnostics using a daisy chain configuration or in parallel mode. Figure 4 shows the daisy chain configuration using the 33996. Data from the MCU is clocked daisy chain through each device while the Chip Select bit (CS) is commanded low by the MCU. During each clock cycle, output status from the daisy-chained 33996s is being transferred back to the MCU via the Master In Slave Out (MISO) line. On rising edge of CS, data stored in the input register is transferred to the output driver. Daisy chain control of the 33996 requires 24 bits per device. Multiple 33996 devices can be controlled in a parallel input fashion using the SPI. Figure 5, page 10, illustrates potentially 32 loads being controlled by two dedicated parallel MCU ports used for chip select. Figure 4. 33996 SPI System Daisy Chain 33996 MC68HCXX Microcontroller Receive Buffer Parallel Ports To Logic 24-Bit Shift Register Shift Register MOSI SI MISO SO SCLK RST CS PWM MC68HCXX Microcontroller 33996 Shift Register Ports Parallel 33996 SI SO SCLK CS RST PWM MISO SCLK PWM1 PWM2 MOSI SI SO SCLK CS RST PWM Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Аналогичный номер детали - MC33996 |
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Аналогичное описание - MC33996 |
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