Datasheet

 3.5 V
 2.5 V
 1.5 V
V
O(CANH)
V
O(CANL)
Dominant
Recessive
SN65HVDA1050A-Q1
www.ti.com SLLS994A –FEBRUARY 2010–REVISED DECEMBER 2010
FUNCTIONAL DESCRIPTION
Operating Modes
The device has two main operating modes: normal mode and silent mode. Operating mode selection is made via
the S input pin.
Table 1. Operating Modes
S PIN MODE DRIVER RECEIVER RXD PIN
LOW NORMAL Enabled (On) Enabled (On) Mirrors CAN bus
HIGH SILENT Disabled (Off) Enabled (On) Mirrors CAN bus
Normal Mode
This is the normal operating mode of the device. It is selected by setting S low. The CAN driver and receiver are
fully operational and CAN communication is bidirectional. The driver is translating a digital input on TXD to a
differential output on CANH and CANL. The receiver is translating the differential signal from CANH and CANL to
a digital output on RXD. In recessive state the bus pins are biased to 0.5 × V
CC
. In dominant state the bus pins
(CANH and CANL) are driven differentially apart. Logic high is equivalent to recessive on the bus and logic low is
equivalent to a dominant (differential) signal on the bus.
Figure 1. Bus Logic-State Voltage Definitions
The SPLIT (V
REF
) pin is biased to 0.5 × V
CC
for bus common mode bus voltage bias stabilization in split
termination network applications (see application information).
Silent Mode
This mode disables the driver (transmitter) of the device; however, the receiver still operates and translates the
differential signal from CANH and CANL to the digital output on RXD. It is selected by setting S high. The bus
pins (CANH and CANL) are biased to 0.5 × V
CC
. SPLIT (V
REF
) pin is biased to 0.5 × V
CC
.
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): SN65HVDA1050A-Q1