SMSC TMC2084 PRODUCT PREVIEW Revision 0.2 (10-23-08)
Data Brief
PRODUCT FEATURES
TMC2084
Standalone Mode
CircLinkTM Controller
Low Power CMOS, 3.3 Volt Power Supply with 5 Volt
Tolerant I/O
Enhanced Token Passing Protocol from ARCNET
— Maximum 15 node per network
— Token Retry Mechanism
— 64/128 Byte Per Packet
— Consecutive Node ID Assignment
Memory Mirror
— Shared Memory within Network
Network Standard Time
— Network Time Synchronization
— Automatic Time Stamping
Coded Mark Inversion
— Intelligent 1-Bit Error Correction
— Magnetic Saturation Prevention
Standalone (I/O) Mode Operates without MCU
— Supports 16 Bit Input and 16 Bit Output
Up to 14 Intelligent Remote I/O Ports:
— Programmable with 8-bit basis (16 to 32 outputs; 0 to
16 inputs)
— Selectable output type (push-pull or open-drain)
— The part of port is definable as strobe outputs and/or
external trigger inputs
— The anti-chatter circuit on the input port can be set in
ON/OFF
— The sampling frequency of the anti-chatter circuit can
be set (19.1Hz/1.22KHz)
Feature Rich Transmit Trigger
— After receiving OUTPUT DATA packet or expiring on-
chip timer
— Continuous transmission
— External trigger input
Flexible Transceiver Interface:
— RS-485 transceiver + twist pair cable
— RS-485 transceiver + pulse transformer + twist pair
cable
— Hybrid transceiver (HYC4000 or HYC2000 from SMSC
Japan)
— Fiber Optics also supported
48-Pin, TQFP Lead-Free RoHS Compliant Package
— Body size: 7 × 7mm; pitch: 0.5mm
Temperature Range from 0 to 70 degrees C
ORDER NUMBER:
TMC2084-HT FOR 48 PIN, TQFP LEAD-FREE ROHS COMPLIANT PACKAGE
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
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Standalone Mode CircLinkTM Controller
Revision 0.2 (10-23-08) 2 SMSC TMC2084
PRODUCT PREVIEW
Standalone Mode CircLinkTM Controller
SMSC TMC2084 3 Revision 0.2 (10-23-08)
PRODUCT PREVIEW
General Description
About CircLink
The CircLink networking controller was developed for small control-oriented local network data
communication based on ARCNET’s token-passing protocol that guarantees message integrity and
calculatable maximum delivery times.
In a CircLink network, when a node receives the token it becomes the temporary master of the network
for a fixed, short period of time. No node can dominate the network since token control must be
relinquished when transmission is complete. Once a transmission is completed the token is passed on
to the next node (logical neighbor), allowing it to be come the master.
Because of this token passing scheme, maximum waiting time for network access can be calculated
and the time performance of the network is predictable or deterministic. Industrial network applications
require predictable performance to ensure that controlled events occur when required.
However, reconfiguration of a regular ARCNET network becomes necessary when the token is missed
due to electronic and magnetic noise. In these cases, the maximum wait time for sending datagrams
can not be guaranteed and the real-time characteristic is impaired. CircLink makes several modification
to the original ARCNET protocol (such as maximum and consecutive node ID assignment) to avoid
token missing as much as possible and reduce the network reconfiguration time.
CircLink implements other enhancements to the ARCNET protocol including a smaller-sized network,
shorter packet size, and remote buffer mode operation that enable more efficient and reliable small,
control-oriented LANs. In addition, CircLink introduces several unique features for reducing overall
system cost while increasing system reliability.
CircLink can operate under a special mode called “Standalone” or “I/O” mode. In this mode, CircLink
does not need an administrating CPU for each node. Only one CPU is needed to manage a CircLink
network composed of several nodes, reducing cost and complexity.
In a CircLink network, the data sent by the source node is received by all other nodes in the network
and stored according to node source ID. For the target node the received data is executed per
ARCNET flow control and the data is stored in its buffer RAM. The receiving node processes the data
while the remaining nodes on the network discard the data when the receiving node has completed.
This memory-mirroring function assures higher reliability and significantly reduces network traffic.
Network Standard Time (NST) is also a unique CircLink feature. NST is realized by synchronizing the
individual local time on each network node to the clock master in the designated node from which the
packet is sent. CircLink also uses CMI code for transmitting signals, rather than the dipulse or bipolar
signals that are the standard ARCNET signals. Since CMI encoding eliminates the DC element, a
simple combination of a standard RS485 IC and a pulse transformer can be used to implement a
transformer-coupled network.
About TMC2084
The TMC2084 is CircLink’s standalone mode controller acting as an intelligent remote I/O controller
that uses the enhanced token passing protocol. TMC2084 I/O nodes are controlled by the Host node
(TMC2074/72) via the network. Thus, TMC2084 enables a single-processor with multi-remote I/O
controllers environment at reasonable cost.
The TMC2084 has thirty-two I/O port lines featuring programmable direction, with 8-bit basis (output:
16 to 32 bit; input: 0 to 16 bit). The maximum number of nodes per network is fifteen, including the
host node. This configuration enables a processor to control a total of 448 (14 × 32) remote I/O lines.
The Output Port type is selectable from either open-drain or push-pull, while one part of the I/O ports
is definable as either output pins for network status monitoring, strobe output pins to handshake with
AD or DA converter, or input pins for external trigger.
TMC2084 also has additional functions including the function to notify the host of its status, the states
of its Output Ports and settings, the function to send packets with timestamp, and the function to
synchronize the on-chip timer to the host.
This rich feature set is contained in a single 48-pin TQFP package.
Standalone Mode CircLinkTM Controller
Revision 0.2 (10-23-08) 4 SMSC TMC2084
PRODUCT PREVIEW
Block Diagram
Figure 1 TMC2084 Block Diagram
General
Purpose
I/O
NST
Time
Stamp
Command
Register
Configuration
Register
Receive Data
Buffer
Transmit Data
MUX
Status
S-P
P-S
Receiver
RZ Modulator
CMI
Demodulator
CMI
Modulator
Enhanced Token Passing
Protocol Microsequencer
PA[7:0]
PB[7:0]
PC[7:0]
PD[7:0]
nRESET
PGS[2:0]
NID[3:0]
PSSL
nCMIBYP
TXD
TXEN
RXIN
CMI Clear Signal
Configuration Register
X1
X2
Flags
VDD
VSS
Standalone Mode CircLinkTM Controller
SMSC TMC2084 5 Revision 0.2 (10-23-08)
PRODUCT PREVIEW
Package Outline
Figure 2 TMC2084 48-Pin TQFP Package Outline
Notes:
1. Controlling Unit: millimeter
2. Package body dimensions D1 and E1 do not include the mold protrusion
3. Maximum mold protrusion is 0.25 mm
Table 1 TMC2084 48-Pin TQFP Package Parameters
SYMBOL ITEMS MIN TYP MAX
A Overall Package Height - - 1.6
A1 Standoff 0.05 - 0.15
A2 Body Thickness 1.35 - 1.45
D X Span 8.8 - 9.2
D1 X body Size 6.9 - 7.1
E Y Span 8.8 - 9.2
E1 Y body Size 6.9 - 7.1
H Lead Frame Thickness 0.09 - 0.2
L Lead Foot Length 0.45 0.6 0.75
L1 Lead Length - 1.0 -
e Lead Pitch 0.5 Basic
T Lead Foot Angle 0° - 7°
W Lead Width 0.17 0.22 0.27
www Lead position Tolerance -0.04 - 0.04
R1 Lead Shoulder Radius 0.08 - -
R2 Lead Foot Radius 0.08 - 0.2
ccc Coplanarity - - 0.08
N Pin count 48
T
H
L
L1
R2
R1
0.25mm
www M
D1
D
N
E
E1
1
Ze
Zd
e
W
A
A2
A1
ccc
