Overview
The TPIC1021 is a LIN (Local Interconnect Network) physical layer transceiver designed by Texas Instruments. It integrates a serial transceiver with wake-up and protection features, making it suitable for use in harsh automotive environments. The device complies with the LIN physical layer specification revision 2.1 and SAE J2602 recommended practice for LIN. It operates on a single wire, bi-directional bus with data rates ranging from 2.4 kbps to 20 kbps.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VSUP) | 7 | 14 | 27 | V |
| Ambient Temperature (TAMB) | -40 | 125 | °C | |
| Supply Current (Normal Mode, EN = 1, Bus Dominant) | 1.2 | 2.5 | mA | |
| Supply Current (Standby Mode, EN = 0, Bus Dominant) | 1 | 2.1 | mA | |
| Supply Current (Normal Mode, EN = 1, Bus Recessive) | 300 | 500 | µA | |
| Supply Current (Standby Mode, EN = 0, Bus Recessive) | 300 | 500 | µA | |
| Low Power Mode Supply Current | 0.175×VSUP | V | ||
| Low-level Input Voltage for Wake-up (VIL) | 0 | 0.4×VSUP | V | |
| High-level Input Voltage (VIH) | 2 | 5.5 | V | |
| Thermal Resistance (Junction-to-Ambient, RθJA) | 145 | °C/W |
Key Features
- LIN physical layer specification revision 2.1 compliant and conforms to SAE J2602 recommended practice for LIN.
- LIN bus speed up to 20 kbps.
- ESD protection to 12 kV (human body model) on LIN pin.
- LIN pin handles voltage from –40 V to 40 V.
- Survives transient damage in automotive environment (ISO 7637).
- Operation with supply from 7-V to 27-V DC.
- Two operation modes: normal and low-power (sleep) mode.
- Low current consumption in low power mode.
- Wake-up available from LIN bus, wake-up input (external switch), or host MCU.
- Interfaces to MCU with 5-V or 3.3-V I/O pins.
- Dominant state timeout protection on TXD pin.
- Wake-up request on RXD pin.
- Control of external voltage regulator (INH Pin).
- Integrated pull-up resistor and series diode for LIN responder applications.
- Low EME (electromagnetic emissions), high EMI (electromagnetic immunity).
- Bus terminal short-circuit protected for short to battery or short to ground.
- Thermally protected.
- Ground disconnection fail-safe at system level.
- Ground shift operation at system level.
- Unpowered node does not disturb the network.
Applications
- Industrial sensing.
- White goods distributed control.
- Automotive networks (e.g., in-vehicle networks).
Q & A
- What is the TPIC1021 and what standard does it comply with?
The TPIC1021 is a LIN (Local Interconnect Network) physical layer transceiver that complies with the LIN physical layer specification revision 2.1 and SAE J2602 recommended practice for LIN.
- What are the operating voltage and temperature ranges for the TPIC1021?
The TPIC1021 operates with a supply voltage from 7 V to 27 V and an ambient temperature range from –40°C to 125°C.
- What are the wake-up options for the TPIC1021?
The TPIC1021 can be woken up from the LIN bus, an external switch (NWake pin), or the host MCU.
- How does the TPIC1021 protect against ESD and transient damage?
The TPIC1021 has ESD protection to 12 kV (human body model) on the LIN pin and survives transient damage in automotive environments according to ISO 7637.
- What are the key power modes of the TPIC1021?
The TPIC1021 has two main operation modes: normal mode and low-power (sleep) mode, with very low quiescent current in low power mode.
- How does the TPIC1021 interface with microcontrollers?
The TPIC1021 interfaces to microcontrollers with 5-V or 3.3-V I/O pins.
- What protection features does the TPIC1021 offer on the TXD pin?
The TPIC1021 has dominant state timeout protection on the TXD pin to prevent the LIN bus from being stuck in a dominant state.
- What is the purpose of the INH pin on the TPIC1021?
The INH pin controls the external voltage regulator.
- How does the TPIC1021 handle bus terminal short-circuits?
The TPIC1021 is protected against bus terminal short-circuits to battery or ground.
- What electromagnetic characteristics does the TPIC1021 have?
The TPIC1021 has low electromagnetic emissions (EME) and high electromagnetic immunity (EMI).
