TJA1027T/20

Part: TJA1027T/20 — NXP Semiconductors

Type: LIN 2.x / ISO 17987-4:2016 (12 V) / SAE J2602 LIN Transceiver

Description: LIN physical-layer transceiver for automotive sub-networks with 5–18 V operating supply, baud rates up to 20 kBd, very low Sleep-mode current (typ. 7 μA), and remote LIN wake-up.

Operating Conditions:

• Supply voltage (VBAT): 5–18 V
• Virtual junction temperature: -40 to +150 °C
• Baud rate: up to 20 kBd
• Logic inputs compatible with 3.3 V and 5 V devices

Absolute Maximum Ratings:

• Max supply voltage (VBAT): 42 V
• Voltage on pin LIN: ±42 V (with respect to GND and VBAT)
• Voltage on TXD, RXD, SLP_N: 7 V
• Max virtual junction temperature: 150 °C
• Storage temperature: -55 to +150 °C

Key Specs:

• Battery supply current, Sleep mode (bus recessive, VLIN = VBAT): 2.5 / 7 / 10 μA (min/typ/max)
• Battery supply current, Normal mode recessive: 200 / 800 / 1600 μA
• Battery supply current, Normal mode dominant (VBAT = 12 V): 1 / 2 / 4 mA
• Driver current limitation (VBAT = 18 V): 40 to 100 mA
• Dominant output voltage: ≤1.4 V at VBAT = 7 V; ≤2.0 V at VBAT = 18 V
• Receiver center voltage: 0.475–0.525 × VBAT
• Slave termination resistance: 20 / 30 / 60 kΩ
• Power-on reset thresholds: Vth(POR)L 1.6–3.9 V; Vth(POR)H 2.3–4.3 V
• Thermal resistance, junction to ambient (free air): 145 K/W (SO8), 50 K/W (HVSON8)
• ESD: ±8 kV (IEC 61000-4-2 and HBM on LIN and VBAT pins)

Features:

• Compliant with LIN 2.0/2.1/2.2/2.2A, SAE J2602 and ISO 17987-4:2016 (12 V)
• Very low EME and very high EMI
• Very low current in Sleep mode with remote LIN wake-up and wake-up via SLP_N
• Integrated slave termination resistor
• Passive behavior in unpowered state
• Full operation from 5 V upwards during cranking pulses
• Undervoltage detection
• K-line compatible
• Thermal shutdown protection
• Initial TXD dominant check
• Bus pin short-circuit proof to battery and ground
• Protected against automotive transients (ISO 7637)
• Pin-compatible with TJA1020/1021/1022/1029 and MC33662(B)

Applications:

• In-vehicle LIN sub-networks (master or slave nodes)

Package:

• SO8 (SOT96-1), 8 leads, body width 3.9 mm (TJA1027T/20)
• HVSON8 (SOT782-1), 3 × 3 × 0.85 mm, 8 terminals (TJA1027TK/20)

Pin TXD provides a pull-down to GND in order to force a predefined level on the transmit data input if the pin is disconnected.

Pin SLP_N provides a pull-down to GND in order to force the transceiver into Sleep mode if pin SLP_N is disconnected.

Pin RXD is set floating if VBAT is disconnected.

The current in the transmitter output stage is limited in order to protect the transmitter against short circuits to pins VBAT or GND.

A loss of power (pins VBAT and GND) has no impact on the bus line or on the microcontroller. No reverse currents flow from the bus into pin LIN. The current path from VBAT to LIN via the integrated LIN slave termination resistor remains. The LIN transceiver can be disconnected from the power supply without influencing the LIN bus.

The output driver on pin LIN is protected against overtemperature conditions. If the junction temperature exceeds the shutdown junction temperature, Tj(sd), the thermal protection circuit disables the output driver. The driver is enabled again when the junction temperature falls below Tj(sd) and pin TXD is recessive.

The initial TXD dominant check prevents the bus line from being driven to a permanent dominant state (blocking all network communications) if pin TXD is forced permanently LOW by a hardware and/or software application failure. The TXD input level is checked after a transition to Normal mode. If TXD is LOW, the transmit path will remain disabled and will only be enabled when TXD goes HIGH.

The TJA1027 satisfies the "Hardware Requirements for LIN, CAN and FlexRay Interfaces in Automotive Applications", Version 1.1, December 2009.

Fig 7. Package outline SOT96-1 (SO8)