THVD1510 Datasheet, PDF (18/39 Pages) Texas Instruments – 5-V RS-485 Transceivers With 18-kV IEC ESD Protection

THVD1510, THVD1512
THVD1550, THVD1551, THVD1552
SLLSEV1 – SEPTEMBER 2017
10 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
The THVD15xx family consists of half-duplex and full-duplex RS-485 transceivers commonly used for
asynchronous data transmissions. For half-duplex devices, the driver and receiver enable pins allow for the
configuration of different operating modes. Full-duplex implementation requires two signal pairs (four wires), and
allows each node to transmit data on one pair while simultaneously receiving data on the other pair.
10.2 Typical Application
An RS-485 bus consists of multiple transceivers connecting in parallel to a bus cable. To eliminate line
reflections, each cable end is terminated with a termination resistor, R_T, whose value matches the characteristic
impedance, Z₀, of the cable. This method, known as parallel termination, generally allows for higher data rates
over longer cable length.
R
R
RE
DE
DD
A
B ^RT
AB
AB
A
R_{T B}
R
R
RE
DE
DD
R
D
R
D
R RE DE D
R RE DE D
Copyright © 2017, Texas Instruments Incorporated
Figure 22. Typical RS-485 Network With Half-Duplex Transceivers
RD
Y
Z ^RT
DE
Master
RE
B
D
R
A ^RT
AB
ZY
A
R_{T B}
R
R
RE
Slave
Z
DE
R_{T Y}
DD
R Slave
D
R RE DE D
Copyright © 2017, Texas Instruments Incorporated
Figure 23. Typical RS-485 Network With Full-Duplex Transceivers
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Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: THVD1510 THVD1512 THVD1550 THVD1551 THVD1552