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MC33290DR2 bảng dữ liệu(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC33290DR2 bảng dữ liệu(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 12 page Analog Integrated Circuit Device Data Freescale Semiconductor 9 33290 TYPICAL APPLICATIONS INTRODUCTION TYPICAL APPLICATIONS INTRODUCTION The 33290 is a serial link bus interface device conforming to the ISO 9141 physical bus specification. The device was designed for automotive environment usage compliant with On-Board Diagnostic (OBD) requirements set forth by the California Air Resources Board (CARB) using the ISO K line. The device does not incorporate an ISO L line. It provides bi- directional half-duplex communications interfacing from a microcontroller to the communication bus. The 33290 incorporates circuitry to interface the digital translations from 5.0 V microcontroller logic levels to battery level logic and from battery level logic to 5.0 V logic levels. The 33290 is built using Freescale Semiconductor’s SMARTMOS process and is packaged in an 8-pin plastic SOIC. FUNCTIONAL DESCRIPTION The 33290 transforms 5.0 V microcontroller logic signals to battery level logic signals and visa versa. The maximum data rate is set by the fall time and the rise time. The fall time is set by the output driver. The rise time is set by the bus capacitance and the pull-up resistors on the bus. The fall time of the 33290 allows data rates up to 150 kbps using a 30 percent maximum bit time transition value. The serial link interface will remain fully functional over a battery voltage range of 6.0 to 18 V. The device is parametrically specified over a dynamic VBB voltage range of 8.0 to 18 V. Required input levels from the microcontroller are ratio- metric with the VDD voltage normally used to power the microcontroller. This enhances the 33290’s ability to remain in harmony with the RX and TX control input signals of the microcontroller. The RX and TX control inputs are compatible with standard 5.0 V CMOS circuitry. For fault-tolerant purposes the TX input from the microcontroller has an internal passive pull-up to VDD, while the CEN input has an internal passive pull-down to ground. A pull-up to battery is internally provided as well as an active data pull-down. The internal active pull-down is current-limit-protected against shorts to battery and further protected by thermal shutdown. Typical applications have reverse battery protection by the incorporation of an external 510 Ω pull-up resistor and diode to battery. Reverse battery protection of the device is provided by using a reverse battery blocking diode (“D” in the Simplified Application Diagram on page 1). Battery line transient protection of the device is provided for by using a 45 V zener and a 500 Ω resistor connected to the VBB source as shown in the same diagram. Device ESD protection from the communication lines exiting the module is through the use of the capacitor connected to the VBB device pin and the capacitor used in conjunction with the 27 V zener connected to the ISO pin. |
Số phần tương tự - MC33290DR2 |
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Mô tả tương tự - MC33290DR2 |
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