MC33660 TRAINING ISO9141 PHYSICAL LAYER MC33660TRN Rev 2.0 Dec 2015 Agenda 2 • Introduction • Internal Block Diagram and Application Schematics • LIN versus ISO9141 MC33660 ONE PAGE OVERVIEW 3 One Page Overview – ISO9141 Transceiver 4 INTERNAL BLOCK DIAGRAM & APPLICATION SCHEMATICS 5 Typical Application • Reverse Battery (1) • Overvoltage Transient (2) • 8.0 kV ESD Protection (3) 6 Simplified Application Diagram Chip ENABLE • Controls device Operation Mode Normal Mode – ‘high’ Sleep Mode – ‘low’ • 5.0V logic compatible VDD • Input determines Logic Level Voltage • 5.0V Logic Compatible • Quiescent Operating Current: 1mA MAX • Sleep State Current: 100uA MAX 7 VBATT • 8V – 18V • Normal Mode: 1mA MAX • Sleep Mode: 50uA MAX K-Line Transceiver • ISO9141 Compliant • Over Temperature Protected • Short to GND protection ISO K-Line Functional Block ISO9141 Functional Blocks 1. 2. 3. 4. 5. 8 Transmitter of K-Line Receiver of K-Line K-Line Bus Enable Module VDD Input Module Transmitter of the K-Line Interface (TXD) • • TXD controls the state of the K-Line − Normal Mode − TXD High (recessive) = K-Line output High − TXD Low (dominant) = K-Line output Low. Internal pull-up resistor (125kohm) − 9 Forces a recessive state if pin is left open MCU Device Pin: TXD (input) Receiver of the LIN interface (RXD) MCU • It reports the state of the LIN to the MCU. Device Pin: RXD (output) 10 K-Line Bus Pin (ISO) • The K-Line bus terminal provides a physical layer for single-wire communication in diagnostics automotive applications. The K-Line physical layer is designed to meet the ISO9141 physical layer specification and has the following features: − − − − − 150kbps Over-Temperature Shutdown Internal pull-up resistor with a TVS Active Pull-down Short to GND Protection Device Pin: ISO (transceiver) 11 Enable (CEN) • It controls the operation of the device − Normal Mode: EN =1 − Sleep: EN = 0 • 5V logic Thresholds • Internal pull-down resistor (125kohm) − 12 Forces sleep state if pin is left open MCU C Device Pin: CEN (input) LIN VERSUS ISO9141 13 LIN versus ISO9141 ISO9141 Simplified Internal Block Diagram 14 LIN ISO9141 Simplified Application Schematics 15 LIN ISO9141 versus LIN 2.1 – comparison table 16