NVE IL3185 Manual

Low-Cost Passive Input RS-485 and RS-422 Isolated Transceivers
Functional Diagrams
DE
V
COIL1
D
R
RE
IL3185
DE
V
COIL1
D
R
RE
IL3122
IL3185 Truth Table
V (A-B) DE* RE
ID
≥ 200 mV L L
≤−200mV L L
Open L L
≥ 1.5 V H L
≤−1.5 V
H L
≥ 1.5 V H H
≤−1.5 V H H
X L H
Z = High Impedance X = Irrelevant
* "H"=no coil-current flowing; "L"=coil current.
IL3122 Receiver
RE R V
(A-B)
H Z X
L H ≥ 200 mV
L L ≤−200 mV
L H Open
Selection Table
Full/Half No. of Devices
Model Duplex Allowed on Bus
IL3185 half
IL3122 full
®
IsoLoop is a registered trademark of NVE Corporation.
*U.S. Patent numbers 5,831,426; 6,300,617 and others.
NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344
V
COIL2
A
B
Y
Z
V
COIL2
A
B
R D* Mode Notes
H X
L X Receive
H X A/B failsafe
H H
R reads back
D information
L L
Drive
Z H
R tri-state
(no output)
Z L
R tri-state;
Z X Disabled
A/B failsafe
IL3122 Driver
DE D V
(Y-Z)
L X Z
H H ≥ 2 V
H L ≤−2 V
Data
Rate
Mbps Fail-Safe
32 5
32 5
Features
5 Mbps data rate
•
3 V to 5 V power supplies
•
Supports up to 32 nodes
•
15 kV bus ESD protection
•
20 kV/µs typical common mode rejection
•
No carrier or clock for low EMI emissions and susceptibility
•
−40 °C to +85 °C temperature range
•
Thermal shutdown protection
•
2500 V isolation
•
RMS
IEC 60747-17 (VDE 0884-17):2021-10; UL 1577
•
0.15" or 0.3" True 8™ mm 16-pin SOIC packages
•
Applications
P.O.S. systems
•
Security networks
•
Building environmental controls
•
Industrial control networks
•
Gaming systems
•
Factory automation
•
Description
The IL3185 and IL3122 are galvanically isolated, differential
bus transceivers designed for bidirectional data
communication over balanced transmission lines. The
devices use NVE's patented* IsoLoop spintronic Giant
Magnetoresistance (GMR) technology. The IL3185 delivers
at least 1.5 V into a 54 Ω load, and the IL3122 at least 2 V
into a 100 Ω load for excellent data integrity over long
cables. These devices are also compatible with 3 V input
supplies, allowing interface to standard microcontrollers
without additional level shifting.
Both the IL3185 and IL3122 have current limiting and
thermal shutdown features to protect against output short
circuits and bus contentions that may cause excessive power
dissipation. The receivers also incorporate a "fail-safe if
open" design, ensuring a logic high on R if the bus lines are
disconnected or "floating."
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(952) 829-9217 www.nve.com
IL3185/IL3122
www.youTube.com/NveCorporation
REV. R
iso-apps@nve.com