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Data Sheet

fido5100/fido5200

APPLICATIONS INFORMATION

analog.com

Rev. G | 18 of 21

Figure 11. Application for the REM Switch

REM SWITCH HARDWARE

The basic REM switch hardware is identified as the fido5100 or

fido5200. For example, the fido5100 supports the following proto-

cols:

►

PROFINET RT and IRT, Class B and Class C

►

EtherNet/IP with and without DLR, QuickConnect, CIP Sync, and

CIP Motion

►

Modbus TCP

The fido5200 supports the following protocols:

►

EtherCAT

►

All protocols defined for the fido5100

The REM switches are PI Net Load Class III capable. It also

supports IEEE 1588 Version 2 for ordinary clock (both peer to peer

and end to end transparent clocks), raw frames, and user datagram

protocol (UDP), as well as discovery configuration protocol (DCP),

link layer discovery protocol (LLDP), dynamic host configuration

protocol (DHCP), rapid spanning tree protocol (RSTP), virtual local

area network (VLAN), and Internet group management protocol

(IGMP) snooping support.

REM Switch Drivers

The REM switch driver for each protocol is provided as portable C

code. The REM Switch Software Driver User Guide describes the

driver for each protocol and its integration into a host processor.

Refer to UG-1285 to download the user guide.

BOARD LAYOUT

The following guidelines provide best practice for board layout with

the REM switch:

►

Use individual polygons for the power planes for each of the

three supplies. Allow at least 0.2 mm of isolation between the

power planes.

►

Isolate clock signals from the other traces and make them as

short as possible.

►

A minimum clearance around the REM switch of 3 mm is re-

quired to facilitate heat dissipation.

DESIGN CONSIDERATIONS

Power

The REM switch require 1.2 V and 3.3 V power supplies. Each

power level requires its own power plane on the PCB.

The REM switch uses 3.3 V LVCMOS logic levels for its I/O. This

I/O requires a 3.3 V (±10%) power supply circuit. Ideally, this circuit

uses a low noise switching power supply. The REM switch use a

1.2 V (±10%) supply for the core of the chip. The core power supply

requires its own power plane on the PCB. Additional best practices

include

►

Use one 0.1 µF bypass capacitor for every 1.2 V power pin.

►

Use a power supply IC rated to supply at least 100 mA.

►

Supply 3.3 V power from its own layer on the PCB to the 3.3 V

power input pins on the REM switch.

►

Use one 0.1 µF bypass capacitor for every 3.3 V power pin.

►

For the 1.2 V analog supply, the signal must be isolated using a

120 Ω, 500 mA ferrite bead and 10 µF, 1 µF, and 0.1 µF filtering

capacitors.

Reset

The RESET signal is typically driven by the host microprocessor

that is paired with the REM switch. RESET is an active low signal;

therefore, pull RESET high as power becomes valid.

Physical Layer (PHY)

The REM switch is designed intentionally without PHYs because

of the different requirements on PHY performance. EtherCAT and

PROFINET IRT have much tighter latency and jitter requirements

than standard Ethernet. The ADIN1200 is a low power, single port,

10 Mbps, and 100 Mbps Ethernet PHY. It is designed for industrial

Ethernet applications and pairs well with fido® devices where a

PHY is needed.

Clocking

Most PHYs allow the user to clock the PHY with a crystal oscillator

or a separate clock source when using an MII interface. It is a

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