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MCZ33291LEGR2 Arkusz danych(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33291LEGR2 Arkusz danych(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 26 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33291L FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 33291L was conceived, specified, designed, and developed for automotive applications. It is an eight-output low-side power switch having 8-bit serial control. The 33291L incorporates SMARTMOS technology having CMOS logic, bipolar/MOS analog circuitry, and independent state of the art double diffused MOS (DMOS) power output transistors. Many benefits are realized as a direct result of using this mixed technology. A simplified block diagram delineates 33291L in Figure 2. Where bipolar devices require considerable control current for their operation, structured MOS devices, since they are voltage controlled, require only transient gate charging current affording a significant decrease in power consumption. The CMOS capability of the SMARTMOS process allows significant amounts of logic to be economically incorporated into the monolithic design. Additionally, the bipolar/MOS analog circuits embedded within the updrain power DMOS output transistors monitor and provide fast, independent protection control functions for each individual output. All outputs have internal 45 V at 0.5 A independent output voltage clamps to provide fast inductive turn-off and transient protection. The 33291L uses high-efficiency updrain power DMOS output transistors exhibiting very low room temperature drain-to-source ON resistance values (RDS(ON) ≤ 1.0 Ω at 13 V VPWR) and dense CMOS control logic. Operational bias currents of less than 2.0 mA (1.0 mA typical) with any combination of outputs ON are the result of using this mixed technology and would not be possible with bipolar structures. To accomplish a comparable functional feature set using a bipolar structure approach would result in a device requiring hundreds of milliamperes of internal bias and control current. This would represent a very large amount of power to be consumed by the device itself and not available for load use. During operation, the 33291L functions as an eight 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 33291L directly relieves the MCU of the fault management functions. The 33291L directly interfaces to an MCU, operating at system clock serial frequencies in excess of 3.0 MHz. It uses a Synchronous Peripheral Interface (SPI) for control and diagnostic readout. Figure 12 illustrates the basic SPI configuration between an MCU and one 33291L. Figure 12. SPI Interface with Microcontroller The circuit can also be used in a variety of other applications in the computer, telecommunications, and industrial fields. It is parametrically specified over an input battery/supply range of 9.0 V to 16 V but is designed to operate over a considerably wider range of 5.5 V to 26.5 V. The design incorporates the use of logic level MOSFETs as output devices. These MOSFETs are sufficiently turned ON with a gate voltage of less than 5.0 V, thus eliminating the need for an internal charge pump. Each output is identically sized and independent in operation. The efficiency of each output transistor is such that at room temperature with as little as 9.0 V supply (VPWR), the maximum RDS(ON) of an output at room temperature is 1.2 Ω (0.9 Ω typical) and increases to only 2.0 Ω as VPWR is decreased to 5.5 V. All inputs are compatible with 5.0 V CMOS logic levels, incorporating negative or inverted logic. Whenever an input is programmed to a logic low state (<1.0 V) the corresponding low side switched output being controlled will be active low and turned ON. Conversely, whenever an input is programmed to a logic high state (>3.0 V), the output being controlled will be high and turned OFF. One main advantage of the 33291L is the serial port. When coupled to an MCU, it receives ON/OFF commands from the MCU and in return transmits the drain status of the device’s output switches. Many devices can be daisy- chained together, forming a larger system, as illustrated in Figure 13, page 12. Note In this example, only one dedicated MCU parallel port (aside from the required SPI) is required for chip select to control 32 possible loads. 33291 MC68HCXX Microcontroller Shift Register Shift Register To Logic Receive Buffer Parallel Ports MOSI SI MISO SO SCLK RST CS |
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Podobny opis - MCZ33291LEGR2 |
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