TJA1021 Datasheet, PDF (1/25 Pages) NXP Semiconductors – LIN 2.1/SAE J2602 transceiver

TJA1021
LIN 2.1/SAE J2602 transceiver
Rev. 05 — 22 October 2009
Product data sheet
1. General description
The TJA1021 is the interface between the Local Interconnect Network (LIN) master/slave
protocol controller and the physical bus in a LIN. It is primarily intended for in-vehicle
sub-networks using baud rates from 1 kBd up to 20 kBd and is LIN 2.1/SAE J2602
compliant. The TJA1021 is pin-to-pin compatible with the TJA1020 with an improved
ElectroStatic Discharge (ESD) specification.
The transmit data stream of the protocol controller at the transmit data input (TXD) is
converted by the TJA1021 into a bus signal with optimized slew rate and wave shaping to
minimize ElectroMagnetic Emission (EME). The LIN bus output pin is pulled HIGH via an
internal termination resistor. For a master application, an external resistor in series with a
diode should be connected between pin INH or pin V_BAT and pin LIN. The receiver detects
the data stream at the LIN bus input pin and transfers it via pin RXD to the microcontroller.
In Sleep mode, the power consumption of the TJA1021 is very low. In failure modes, the
power consumption is reduced to a minimum.
2. Features
2.1 General
I LIN 2.1/SAE J2602 compliant
I Baud rate up to 20 kBd
I Very low ElectroMagnetic Emission (EME)
I High ElectroMagnetic Immunity (EMI)
I Passive behavior in unpowered state
I Input levels compatible with 3.3 V and 5 V devices
I Integrated termination resistor for LIN slave applications
I Wake-up source recognition (local or remote)
I Supports K-line like functions
I Pin-to-pin compatible with TJA1020
2.2 Low power management
I Very low current consumption in Sleep mode with local and remote wake-up
2.3 Protection mechanisms
I High ESD robustness: ±6 kV according to IEC 61000-4-2 for pins LIN, V_BAT and
WAKE_N
I Transmit data (TXD) dominant time-out function