Datasheet

1
2
3
4
5
6
7
8
GND
LIN
V
SUP
INH
TXD
NWake
EN
RXD
D PACKAGE
(TOP VIEW)
SN65HVDA195-Q1
SLLS961A –JULY 2009–REVISED OCTOBER 2009 www.ti.com
DESCRIPTION
The SN65HVDA195 is the Local Interconnect Network (LIN) physical interface and MOST ECL interface, which
integrates the serial transceiver with wake-up and protection features. The bus is a single-wire bidirectional bus
typically used for low-speed in-vehicle networks using data rates to 20 kbps. The device can transmit with an
effective data rate of 0 kbps since it does not have dominant state time out. The protocol output data stream on
TXD is converted by the SN65HVDA195 into the bus signal through a current-limited wave-shaping driver as
outlined by the LIN Physical Layer Specification Revision 2.0. The receiver converts the data stream from the
bus and outputs the data stream via RXD. The bus has two states: dominant state (voltage near ground) and the
recessive state (voltage near battery). In the recessive state, the bus is pulled high by the SN65HVDA195’s
internal pullup resistor and series diode, so no external pullup components are required for slave applications.
Master applications require an external pullup resistor (1 kΩ) plus a series diode per the LIN specification.
In sleep mode, the SN65HVDA195 requires low quiescent current even though the wake-up circuits remain
active, allowing for remote wake up via the LIN bus or local wake up via the NWake or EN pins.
The SN65HVDA195 has been designed for operation in the harsh automotive environment. The device can
handle LIN bus voltage swings from 40 V down to ground and survive –40 V. The device also prevents back-feed
current through LIN to the supply input, in case of a ground shift or supply voltage disconnection. It also features
undervoltage, overtemperature, and loss-of-ground protection. In the event of a fault condition, the output is
immediately switched off and remains off until the fault condition is removed.
TERMINAL FUNCTIONS
TERMINAL ASSIGNMENTS
PIN
TYPE DESCRIPTION
NAME NO.
RXD 1 O RXD output (open drain) interface reporting state of LIN bus voltage
EN 2 I Enable input
NWake 3 I High voltage input for device wake up
TXD 4 I TXD input interface to control state of LIN output
GND 5 GND Ground
LIN 6 I/O LIN bus single-wire transmitter and receiver
V
SUP
7 Supply Device supply voltage (connected to battery in series with external reverse blocking diode)
INH 8 O Inhibit controls external voltage regulator with inhibit input
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
–40°C to 125°C SOIC – D Reel of 2500 SN65HVDA195QDRQ1 A195Q
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
2 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): SN65HVDA195-Q1