SN65HVDA195-Q1

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SLLS961A – JULY 2009 – REVISED OCTOBER 2009

Local Interconnect Network (LIN) Bus

This I/O pin is the single-wire LIN bus transmitter and receiver.

Transmitter Characteristics

The driver is a low-side transistor with internal current limitation and thermal shutdown. There is an internal

30-k

slave mode applications. An external pullup resistor of 1 k

device is used for master node applications.

Voltage on LIN can go from –40-V to 40-V dc without any currents other than through the pullup resistance.

The LIN thresholds and ac parameters are LIN Protocol Specification Revision 2.0 compliant.

During a thermal shut down condition, the driver is disabled.

Receiver Characteristics

The receiver’s characteristic thresholds are ratio-metric with the device supply pin. Typical thresholds are 50%,

with a hysteresis between 5% and 17.5% of supply.

The receiver is capable of receiving higher data rates (>100 kbps) than supported by LIN or SAEJ2602

specifications. This allows the SN65HVDA195 to be used for high-speed downloads at end-of-line production or

other applications. The actual data rates achievable depend on system time constants (bus capacitance and

pullup resistance) and driver characteristics used in the system.

Transmit Input (TXD)

TXD is the interface to the MCU’s LIN protocol controller or SCI/UART used to control the state of the LIN output.

When TXD is low, the LIN output is dominant (near ground). When TXD is high, the LIN output is recessive (near

battery). The TXD input structure is compatible with microcontrollers with 3.3-V and 5-V I/O. TXD has an internal

pulldown resistor. This device does not have a TXD dominant time out protection circuit so that low data rates

may be used.

Receive Output (RXD)

RXD is the interface to the MCU’s LIN protocol controller or SCI/UART, which reports the state of the LIN bus

voltage. LIN recessive (near battery) is represented by a high level on RXD and LIN dominant (near ground) is

represented by a low level on RXD. The RXD output structure is an open-drain output stage. This allows the

SN65HVDA195 to be used with 3.3-V and 5-V I/O microcontrollers. If the microcontroller’s RXD pin does not

have an integrated pullup, an external pullup resistor to the microcontroller I/O supply voltage is required.

RXD Wake-up Request

When the SN65HVDA195 has been in low-power mode and encounters a wake-up event from the LIN bus or

NWake pin, RXD goes low, while the device enters and remains in standby mode (until EN is reasserted high

and the device enters normal mode).

reverse battery blocking diode. The characterized operating voltage range for the SN65HVDA195 is from 7 V to

Ground (GND)

GND is the SN65HVDA195 device ground connection. The SN65HVDA195 can operate with a ground shift as

at the ECU level, the SN65HVDA195 does not have a significant current consumption on LIN bus.

Copyright © 2009, Texas Instruments Incorporated

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