HT33290
The HT33290 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 HT33290 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.
The HT33290derives its robustness to temperature
and voltage extremes by being built on a process,
incorporating CMOS logic, bipolar/MOS analog
circuitry, and DMOS power FETs. Although the HT33290 was principally designed for
automotive applications, it is suited for other serial communication applications. It is
parametrically specified over an ambient temperature range of -40°C ≤ TA ≤ 125°C and
8.0 V ≤ VBB ≤ 18 V supply. The economical SO-8 surface-mount plastic package makes
the HT33290 very cost effective.
Features
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Designed to Operate Over Wide Supply Voltage of 8.0 to 18 V
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Ambient Operating Temperature of -40 to 125°C
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Interfaces Directly to Standard CMOS Microprocessors
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ISO K Line Pin Protected Against Shorts to Ground
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Thermal Shutdown with Hysteresis
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Maximum Transmission Speeds in Excess of 50 k Baud
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ISO K Line Pin Capable of High Currents
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ISO K Line Can Be Driven with up to 10 nF of Parasitic Capacitance
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8.0 kV ESD Protection Attainable with Few Additional Components
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Standby Mode: No VBat Current Drain with VDD at 5.0 V
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Low Current Drain During Operation with VDD at 5.0 V