Operating Information - Analog Devices LINEAR TECHNOLOGY LTC2874 Demo Manual

DEMO MANUAL DC2228A

operating information

Overview
The DC2228A implements a complete IO-Link Master for
eight ports. Two LTC2874 quad-master IC's provide power
and signaling for the physical interface (PHY). The IO-Link
stack protocol runs on one core of a dual-core NXP LPC43
microcontroller. The other core runs an Ethernet port for
connecting to a PC running a control program.
A 90W LTPoE ++ ™
Power over Ethernet system supports
alternative power from sourcing equipment such as a
PoE injector or PoE switch. The LTPoE ++ circuits use an
LT4321 ideal diode bridge and an LT4275 PD controller,
and feed into an isolated flyback converter controlled by
an LT3748.
Four IO-Link ports connect directly to the LPC43's built-
in UARTs, while the remaining four use a port expander
application run by an Atmel SAM4N MCU.
Supporting functional blocks include a step-down switch-
ing regulator that uses an LT3682 to produce a regulated
3.3V supply for both microcontrollers, and a temperature
sensor made with an LTC2997.
Compatibility
The DC2228A and Control Tool software will operate any
device compliant with IEC 61131-9 Single-Drop Commu-
nication Interface (SDCI), commonly known as IO-Link.
Switch and Button Controls
S1: Power Source Selector. Selects between external 24V
(switch up) and PoE (switch down) sources.
SW1 (RESET): Resets the NXP microcontroller and Eth-
ernet connection.
SW2 (IP): Sets the current IP address as the default.
4
Connectors
J1: Ethernet jack
J5: External 24V power
J16: JTAG programming interface for NXP LPC43 micro-
controller. Factory use only.
J18: JTAG programming interface for Atmel SAM4 micro-
controller. Factory use only.
J21 to J28: M12 connectors for IO-Link cables. Although
these are 5-pin connectors, the DC2228A PHY uses only
3 pins per port.
Table 1. Connector vs. Port
PORT
1
2
3
4
5
6
7
8
Table 2. M12 Connector Pins
PIN NUMBER PIN NAME
1
2
3 L– (GND)
4
5
Jumpers
J41: PoE Classification resistor selector. Selects 49.9Ω
RCLASS resistor. See Table 5. Default shunt.
J42: LTPoE ++ Classification resistor selector. Selects
118Ω RCLASS++ resistor. See Table 5. Default shunt.
J103: JTAG source selector for SAM4N. Factory use only.
Default position 2–3 (GND).
CONNECTOR
J25
J21
J26
J22
J27
J23
J28
J24
L+
1 2
N/C
5
4 3
C/Q
N/C
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