ISO K Line Serial Link Interface

The 33290 is a serial link bus interface device designed to provide bidirectional half-duplex communication interfacing in automotive diagnostic applications. It is designed to interface between the vehicle’s on-board microcontroller and systems off-board the vehicle via the special ISO K line. The 33290 is designed to meet the Diagnostic Systems ISO9141 specification. The device’s K line bus driver’s output is fully protected against bus shorts and overtemperature conditions.

FEATUREs
• Designed to Operate Over Wide Supply Voltage of 8.0 to 18 V
• Ambient Operating Temperature of -40 to 125°C
• Interfaces Directly to Standard CMOS Microprocessors
• ISO K Line Pin Protected Against Shorts to Ground
• Thermal Shutdown with Hysteresis
• Maximum Transmission Speeds in Excess of 50 k Baud
• ISO K Line Pin Capable of High Currents
• ISO K Line Can Be Driven with up to 10 nF of Parasitic Capacitance
• 8.0 kV ESD Protection Attainable with Few Additional Components
• Standby Mode: No VBat Current Drain with VDD at 5.0 V
• Low Current Drain During Operation with VDD at 5.0 V