Linear Technology LTC2874 Quick setup guide

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DEMO MANUAL DC2228A
Description
LTC2874
8-Port IO-Link Master
Reference Design
Demonstration circuit 2228A is a complete 8-port IO-Link
®
Master that uses two LT C
®
2874 IC’s to implement its
IO-Link v1.1 physical interface (PHY). DC2228A operates
either with an external supply VDD or a Power over Ethernet
(PoE) system. The IO-Link stack protocol runs on an
NXP microcontroller. A software Control Tool operates
the DC2228A.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap and LTPoE++ are trademarks of Linear Technology Corporation. IO-Link is a registered
trademark of PROFIBUS Nutzerorganisation (PNO) e.V. All other trademarks are the property of
their respective owners. Compatible with IO-Link Consortium as set forth by PROFIBUS PNO.
performance summary
BoarD photo
Design files for this circuit board are available at
http://www.linear.com/demo/DC2228A
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VDD Input Supply Range J5; S1 in EXT Position 20 30 V
---- PoE Supply Range J1; S1 in PoE Position; LTPoE++ 90W 41 57 V
VSMSupply Voltage for Devices 20 30 V
ISMSupply Current for Devices 200 mA
ISIRMCurrent Pulse Capability for Devices V(L+) > 18V 500 mA

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DEMO MANUAL DC2228A
Quick start proceDure
The following hardware and software are required:
• PCrunningWinXPorlaterwithEthernetorUSB-to-
Ethernet adapter
• TEConceptControlToolsoftware.SeeStep1.
• 24V power supply or PoE power sourcing equipment
(PoE injector or PoE switch).
• One or more IO-Link devices, such as Linear
Technology’s DC2227A.
Thisprocedureassumesa 24V power supply and adynamic
IP address assigned via DHCP. Operation using PoE or a
fixed IP address is described elsewhere in this manual.
1. Download and install the DC2228A Control Tool software
from: www.linear.com/demo/DC2228A.
2. Hook-up (Figure 1):
a. Setthepowersourceselector (S1) to the EXT position.
b. Keeping its output disabled, connect a 24V input
power supply to J5.
NOTE: Ensure that the input voltage does not exceed 30V.
c. Connect anEthernetcablebetweenJ1and thenetwork
to which the PC is connected.
d. Connect one or more IO-Link devices using the M12
connectors(J21–J28)andcablesupto20min length.
Refer to Table 1.
3. Turn on the 24V Power.
4. Operate the DC2228A using the Control Tool software.
Refer to the DC2228A Control Tool section for details.
Briefly, the steps are:
a. Start the Control Tool.
b. Find the IP address assigned to the DC2228A by
DHCP.
c. Configure port devices using I/O Description (IODD)
files.
d. Enter the DC2228A IP address (from Step a), then
click the “Connect” button to connect the Control
Tool software to the DC2228A (Figure 8).
e. Click “Power ON” button to turn on device power.
f. Click “IO-Link” button to begin communication.
5. Alternate configurations:
a. For operation using a direct Ethernet connection not
involving a LAN, refer to the Alternate Configuration
for Fixed IP Address section and Figure 2.
b. For Power over Ethernet (PoE) operation, refer to the
Power over Ethernet section and Figures 3 and 4.
6. Reference material:
a. Refer to the DC2227A Demo Manual for information
and operating details if using this IO-Link device.
7. When finished, disable all ports (using the “Inactive”
and “Power OFF” buttons) and disconnect the Control
Tool (using the “Disconnect” button). Then, turn off the
power supply or PoE source.

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DEMO MANUAL DC2228A
Quick start proceDure
Figure 1. Set-Up Using Power Supply and DHCP
Figure 2. Alternate Set-Up Using Power Supply and Direct Ethernet Connection
CABLES
TO DEVICES
(0 TO 20m)
24V
4A
+
–
PORT 4
PORT 2
LOCAL AREA NETWORK
*
*
*
ETHERNET CABLES
PC RUNNING
DC2228A
CONTROL TOOL
(USE 'EXT'
SWITCH
SETTING)
24V
4A
ETHERNET CABLE
PC RUNNING
DC2228A
CONTROL TOOL
+
–
PORT 4
PORT 2
CABLES
TO DEVICES
(0 TO 20m)
(USE 'EXT'
SWITCH
SETTING)

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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.
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 CONNECTOR
1 J25
2 J21
3 J26
4 J22
5 J27
6 J23
7 J28
8 J24
Table 2. M12 Connector Pins
PIN NUMBER PIN NAME
1 2
4 3
5
1 L+
2 N/C
3 L– (GND)
4 C/Q
5 N/C
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).

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DEMO MANUAL DC2228A
operating information
Status Indicators
Top LED
Table 3. LED0 (Ethernet Link/Active)
STATE DESCRIPTION
Off No link
Green Link
Blinking Green Activity
Bottom LED
Table 4. LED1 (Ethernet Link Speed)
STATE DESCRIPTION
Off 10 Mbps
Green 100 Mbps
Power over Ethernet (PoE)
The DC2228A optionally operates using power supplied
over an Ethernet connection, eliminating the need for a
local power supply. To use this mode:
a. Set the power source selector (S1) to the PoE position.
b. Connect a PoE injector (Figure 3), PoE switch, or
other Power Sourcing Equipment capable of 90W (for
example, an LTPoE++ demo board, DC1814A-D) to its
power adapter or supply.
c. Connect an Ethernet cable between J1 and the PoE
injector/switch output.
d. Connect an Ethernet cable between the PoE injector/
switchinput and thePCrunningthe ControlToolsoftware.
Because the DC2228A is nominally classified as a 90W
LTPoE++ PD (Powered Device), it requires a PSE rated at
this power level for unrestricted operation.
Limited operation with a PSE rated for less power is pos-
sible, but the classification must be changed using Table5.
For example, to operate using a 13W PoE injector, remove
the J42 shunt (keeping the J41 shunt in place) and restrict
the total power consumption accordingly.
A PSE rating below 90W might easily be adequate, depend-
ing on the actual power consumed by devices connected
to eight ports. This consideration must take into account
whether the C/Q lines will drive DC loads (e.g., in SIO
mode) or only connect with IO-Link devices.
For additional guidance regarding PoE classification set-
tings, refer to the LT4275 data sheet.
Figure 3. 90W LTPoE++ Injector (Allnet ALL048900)
Table 5. Classification Resistor Programming
RCLASS RCLASS++
CLASS PD Type NOMINAL
ICLASS
PD POWER
AVAILABLE NOTE
J40
34.8Ω
J41
49.9Ω
J42
118Ω
J43
34.8Ω
---- Open Open ---- 0 Type 1 0.4mA 13W
---- Shunt Open ---- 3 Type 1 28mA 13W
---- Open Shunt ---- ---- Invalid ---- ----
Shunt* Open Open ---- 4 Type 2 40mA 25.5W
---- Open Open Shunt* 4** LTPoE++ 40mA 38.7W
---- Shunt Shunt ---- 4** LTPoE++ 40mA 90W Default
*Jumper not provided. Requires addition of 2-pin header to PC board.
**LTPoE++ PD will be classified as Class 4 Type 2 by an IEEE 802.3 compliant PSE.

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DEMO MANUAL DC2228A
operating information
TVS Protection
The C/Q and L+ pins are protected by 36V TVS diodes. Do
not connect to any voltage higher than 30V.
Thermal Protection
If the DC2228A board temperature reaches 80°C, the Con-
trol Tool software reports a “TEMP-FAULT” and disables
operation. The thermal sensor Q19 is located underneath
flyback transformer T1.
L+ Diode Isolation
If L+ isolation is desired, remove 0Ω resistors R158 to
R165 which normally shunt Schottky diodes D28 to D35.
Demonstration Board Options
The DC2228A reference design demonstrates LTC2874
operating in an 8-port IO-Link master system. Its two
LTC2874 IC’s operate under the control of the IO-Link v1.1
protocol stack coded in microcontroller firmware. Control
Tool software provides access to a limited set of LTC2874
features but is oriented toward operating IO-Link devices
that connect to the DC2228A ports.
The default internal register settings for the on-board
LTC2874 IC’s are listed in Table 6.
Another demonstration board, DC1880A, provides access
to all LTC2874 features and more direct access to its SPI
register.
Table 6. DC2228A Default Settings for LTC2874 R/W Registers
Register
Address
Register
Name
Default
Value
Register
Address
Register
Name
Default
Value
0x1 IRQMASK 0x96 0x9 MODE2 0x04
0x2 EVENT1 0x00 0xA NSF 0xFF
0x3 EVENT2 0x00 0xB ILLM 0xFF
0x4 EVENT3 0x00 0xC TMRCTRL 0xD2
0x5 EVENT4 0x00 0xD CTRL1 0x00
0x8 MODE1 0x80 0xE CTRL2 0x00
Companion IO-Link Device DC2227A
While the DC2228A and Control Tool software will operate
any IO-Link sensor, the example screen shots given in this
manual use the DC2227A IO-Link Device with Multiple
Sensors. The DC2227A is a complete IO-Link Device
incorporating the LT3669-2 along with a temperature sen-
sor, light sensor, pushbutton, and an incandescent lamp.
IO-Link Firmware
The firmware contained in the NXP microcontroller is intel-
lectual property owned by TEConcept Gmbh in Germany.
Any attempt to copy, transfer, or reverse engineer the
firmware is forbidden. The source code or an object library
for the IO-Link stack can be licensed from TEConcept.

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DEMO MANUAL DC2228A
operating information
Figure 4. Set-Up Using PoE and DHCP
Figure 5. Alternate Set-Up Using PoE and Direct Ethernet Connection
CABLES
TO DEVICES
(0 TO 20m)
*
ETHERNET
(USE 'PoE'
SWITCH
SETTING)
PORT 4
PORT 2
LOCAL AREA NETWORK
*
*
*
CABLES
56V
2A
+
–
PSE
+
–
OUT
90W PoE
IN
PC RUNNING
DC2228A
CONTROL TOOL
56V
2A
CABLES
TO DEVICES
(0 TO 20m)
*
ETHERNET CABLES
+
–
(USE 'PoE'
SWITCH
SETTING)
PORT 4
PORT 2
PC RUNNING
DC2228A
CONTROL TOOL
+
–
OUT
90W PoE
PSE
IN
*
*

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DEMO MANUAL DC2228A
Dc2228a control tool
Overview
The DC2228A Control Tool configures and operates the
8-port IO-Link Master via an Ethernet connection. It
controls and monitors the status of each port, while also
providing access to the parametric register data within
each connected IO-Link device.
The Control Tool supports DHCP for dynamic IP address
assignments, or can operate using a fixed IP address.
Along with some navigation aids, the main window is
shown in Figure 6.
Installation
Download the software from www.linear.com/demo/
DC2228A and follow the on-screen instructions.
IO-Link Device Configuration
For any port that will operate an IO-Link device, load the
device’s IO Device Description, or IODD, file (Figure 7):
1. Click “Select device” button.
2. If IODD file isn’t already listed, click “Import” button,
select the {IODD}.xml file, and then click “Open.”
3. Highlight the IODD file to be assigned and click the
“Select device” button.
Normal Configuration for Network Connection using
DHCP
Normally, the Control Tool connects with the DC2228A
via Ethernet connections to a local area network (LAN),
in which case network-assigned IP addresses are usually
expected. To configure for dynamic IP address assign-
ment by DHCP, both the PC and the DC2228A must each
be configured for this mode. However, for the PC, this is
usually already the case, and it’s also the default mode
for the DC2228A.
1. Connect Ethernet cables per Figure 1 (if using a power
supply) or Figure 4 (if using PoE).
2. As needed, set the PC settings per the section Configur-
ing a PC to Operate with DHCP-Assigned IP Address.
3. Apply power from either a 24V power supply or PoE
power sourcing equipment.
4. Start the Control Tool software.
5. Find the IP address assigned to the DC2228A as follows:
a. Open a Command Window.
b. Get the PC IPv4 address returned by:
ipconfig
c. In the Control Tool, run Master settings →Find. Set
the IP address range to span the subnet that includes
the PC’s IP address from Step 5b; then click the
“Search” button.
d. When the utility finishes running, note the IP address
listed following “IO-Link Master connected on ad-
dress:”
6. Enter the DC2228A communication settings
(Figures 8a and 8b):
IP address = {from step 5}
Port = 7
7. Connect the Control Tool to the DC2228A using the
green “Connect” button (Figure 8c and 8d).
NOTE: to re-enable DHCP behavior after using the
DC2228A with a fixed IP address, use the procedure
givenin the section One-Time DC2228A configuration to
Restore DHCP Behavior after using a Fixed IP Address.
Alternate Configuration for Fixed IP Address
To use a fixed IP address, first configure both the PC and
the DC2228A for this mode:
1. Connect Ethernet cables according to Figure 2 (if using
a power supply) or Figure 5 (if using PoE).
2. Configure the PC to operate with a fixed IP address
using the procedure given in the section Configuring a
PC to Operate with Fixed IP Addresses.
3. Configure the DC2228A to operate with a fixed IP
address using the procedure given in the section One-
Time DC2228A Configuration to Use a Fixed IP Address
Instead of DHCP.

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DEMO MANUAL DC2228A
Dc2228a control tool
4. Apply power from either a 24V power supply or PoE
power sourcing equipment.
5. Start the Control Tool software.
6. Enter the DC2228A communication settings (Figure 8a
and 8b). Using the default address:
IP address = 192.168.10.150
Port = 7
NOTE: The default IP address can be changed using
the procedure given in the section One Time DC2228A
configuration to change the fixed IP address.
7. Connect the Control Tool to the DC2228A using the
green “Connect” button (Figure 8c and 8d).
IO-Link Operation
To operate a connected device that’s been configured for
IO-Link operation (Figure 9):
1. Click the “Power ON” button to supply power to the
device.
2. Click the “IO-Link” button to begin communication.
3. Operate IO-Link device. For a typical sensor thisinvolves
monitoring process data and events.
4. Click the “Inactive” and “Power OFF” buttons when
done.
Digital Input Operation
To operate in DI mode (Figure 10), for receiving data from
a device connected to the C/Q line:
1. If an IODD file has been associated with the port,
remove it using Select device →Exit and not select.
When powered, the connected device will now run in
Standard IO (SIO) mode.
2. Click the “Power ON” button to supply power to the device.
3. Click the “DI” button. The Raw Process Data In field
will monitor the digital state at the C/Q pin.
4. In the case of a DC2227A device, the C/Q state can be
changed by interacting with its light sensor.
5. Click the “Inactive” and “Power OFF” buttons when done.
Digital Output Operation
To operate in DO mode (Figure 11), for switching the C/Q
line as a Standard IO (SIO) output:
1. If an IODD file has been associated with the port,
remove it using Select device →Exit and not select.
When powered, the connected device will now run in
Standard IO (SIO) mode.
2. Consider whether the connected device will tolerate a
C/Q driver conflict. If conflicts occur, master C/Q over-
current events could be triggered (see Fault Conditions
section). If connected to a DC2227A, be aware that the
device output state in SIO mode is determined by its
light sensor. The DC2228A and DC2227A won’t damage
each other. Other devices could be stronger or weaker
than the DC2228A, and might not tolerate a conflict.
3. Click the “Power ON” button to supply power to the device.
4. Click the “DO” button and “OK” the confirmation mes-
sage.
5. Click the “High” or “Low” radio buttons to switch the
C/Q state.
6. Click the “Inactive” and “Power OFF” buttons when
done.
Fault Conditions
If the Control Tool detects a fault on any port, it reports, in
red, a Master PHY event at the bottom of the main window.
The operator may query faults using the Master settings
→Check PHY events pull-down menu. After fixing the
underlying condition, the operator may clear faults using
the same pull-down menu.
Software License and Renewal
The Control Tool license is valid for 10000 minutes of
cumulative operation. Unlimited free renewals, as well as
an unlimited license, are available. To renew the license:
1. Get the hardware ID usingTools →License key manager
and clicking the “Export hardware ID” button.

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DEMO MANUAL DC2228A
Dc2228a control tool
DC2228A F06
A C E J
F
D
G H I
B K
(A) Control Tool connection controls (G) Connected device state and speed
(B) Control Tool connection status (H) Light bulb controls and status
(C) Port selector (I) Process data
(D) Port status (J) Device parameters
(E) Device selector and device parameters (K) Firmware version
(F) Device configuration controls
Figure 6. Control Tool Main Window
2. Send the hardware ID and request for free license
renewal to TEConcept GmbH using this address and
subject line:
To: [email protected]
Subject: DC2228A license renewal request
3. Receive the new license key by email.
4. Again using Tools →License key manager, enter the
new key. For Period, enter “10000”. Then click the
“Send” button and close the window.
5. Re-open the license manager and check that the “Re-
maining time” has been reset.

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DEMO MANUAL DC2228A
Dc2228a control tool
Figure 7. Selecting a Device IODD (IO Description Data) File
DC2228A F06
(a) (c)
(b)
DC2228A F07

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DEMO MANUAL DC2228A
Dc2228a control tool
Figure 8. Connecting the Control Tool to DC2228A
(a) (b)
(c)
(d) DC2228A F08

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DEMO MANUAL DC2228A
Dc2228a control tool
Figure 9. IO-Link Operation
(a)
(b) DC2228A F09

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DEMO MANUAL DC2228A
Dc2228a control tool
Figure 10. Digital Input (DI) Mode
(a)
(b) DC2228A F10

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DEMO MANUAL DC2228A
Dc2228a control tool
Figure 11. Digital Output (DO) Mode
(a)
(b) DC2228A F11

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DEMO MANUAL DC2228A
aDDitional information
Configuring a PC to Operate with DHCP-Assigned IP
Address
For a PC running Windows 7:
a. Open the adapter settings for the LAN adapter: Control
Panel →Network and Internet →Network and Sharing
Center →Change adapter settings
b. Rightclicktheappropriateadapterandselect “Properties.”
c. Highlight “Internet Protocol Version 4 (TCP/IPv4),” then
click the “Properties” button.
d. Select “Obtain an IP address automatically.”
e. “OK” or “Close” all windows.
A PC connected to a LAN likely already uses DHCP.
Configuring a PC to Operate with Fixed IP Addresses
For a PC running Windows 7:
Steps a through c: same as above
d. Select “Use the following IP address” and configure as
follows. For “X”, use an integer such as 2 and don’t use
the address assigned to the DC2228A (default = 150).
IP address: 192.168.10.X
Subnet mask: 255.255.255.0
Default gateway: {leave blank}
e. “OK” or “Close” all windows.
One-Time DC2228A Configuration to Use a Fixed IP
Address Instead of DHCP:
The DC2228A comes preconfigured for DHCP operation.
To operate using a fixed IP address for the first time:
a. While powered up, press theSW1 (RESET) and SW2(IP)
buttons on DC2228A at the same time.
b. Release the RESET button first.
c. Release the IP button.
d. If the Control Tool is connected, click the “Disconnect”
button. (Refer to “A” in Figure 6.)
e. Cycle the power or press the RESET button.
The DC2228A will now operate in fixed IP address mode
using the default address 192.168.10.150.
One-Time DC2228A Configuration to Change the Fixed
IP Address:
a. While powered up and connected to the Control Tool,
select Master settings →Set network address →Use
fixed IP address.
b. Enter the new address, then click the “Set”” button.
c. Cycle the power or press the SW1 (RESET) button.
The DC2228A will use this address when operating in
fixed IP address mode.
One-Time DC2228A Configuration to Restore DHCP
Behavior after Using a Fixed IP Address
a. While powered up and connected to the Control Tool,
select Master settings →Set network address →Get
the address from DHCP server.
b. Click the “Set” button.
c. Click the “Disconnect” button.
d. Cycle the power or press the SW1 (RESET) button.
The DC2228A will now operate in DHCP mode.

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DEMO MANUAL DC2228A
trouBleshooting guiDe
PROBLEM SOLUTION
No Ethernet connection (LED0 not blinking) a. Check Ethernet cable connection.
b. Check 24V power supply to green connector (if source selector S1 in up position).
c. Check power adapter connection to PoE power sourcing equipment (if S1 in down position).
d. If using PoE, check PD classification settings against PSE rating. Adjust J41/J42 settings as
needed (see Table 5).
DHCP worked previously, but the Control Tool no
longer connects in a subsequent session
A new IP address might have been assigned to the DC2228A by the DHCP server. In the Control Tool,
run Master settings →Find to confirm the address. Refer to the Normal Configuration for Network
Connection using DHCP section for details.
Error message “Can’t connect to the IO-Link
Master” or “Can’t Open the port!”
a. If LED0 isn’t blinking, refer to above issue.
b. Check IP address settings for PC and DC2228A.
Missing power to connected device a. Check device cable connection.
b. Check that Control Tool port number matches actual port.
c. Click “Power ON” button.
Missing DI or DO button Remove the IODD file association via: Select device →Exit and not select
COMLOST fault when attempting IO-Link
connection
a. Check device cable connection.
b. Check that Control Tool port number matches actual port.
c. Click “Power ON” button if device lacks power.
d. Check that correct IODD has been loaded and Device Parameters entries are valid.
COMPFAULT a. Remove IODD selection, then check whether “Inspection level” setting was inadvertently
changed. Normally it should be set to NO CHECK. When done, reselect IODD.
b. Check health of connected device.
TEMP-FAULT Refer to Thermal Protection section.
a. Investigate source of PC board overheating (overload or environmental).
b. Allow PC board to cool.
c. Return each port to operation, beginning with port's “Power ON” button.
Master PHY event Refer to Fault Conditions section.
General misbehavior Press SW1 (RESET) button on DC2228A. This will require communication between the Control Tool
and DC2228A to be re-established.
Can’t “Select Device”to change IODD Select “Inactive” and “Power OFF” buttons first.
Can’t find the IP addressed to the DC2228A Run Master settings →Find to find the IP address. Refer to the Normal Configuration for Network
Connection using DHCP section for details.
DHCP mode doesn’t work on a particular Local
Area Network
Work-Around: Use a direct Ethernet connection and a fixed IP address. To clear DHCP behavior, refer
to One-Time DC2228A Configuration to Use a Fixed IP Address Instead of DHCP.
License key fault (LICENSEKEYFAULT) Obtain free renewal of 10000 minute license. See Software License and Renewal section.

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DEMO MANUAL DC2228A
parts list
The table below lists components that comprise both the IO-Link physical interface and an optional enclosure. The
complete parts list is found here: www.linear.com/demo/DC2228A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
IO-Link Physical Interface Components
20 14 C36, C39–41, C75–76,
C99, C101, C103, C105,
C107, C109, C111, C113
CAP, 1µF, 10%, 50V, X7R, 1206 TDK, C3216X7R1H105K160AB
21 1 C37 CAP, 220µF, 20%, 50V, 12H10 ELEC PANASONIC, EEE-FT1H221AP
23 8 C100, C102, C104, C106,
C108, C110, C112, C114
CAP, 560pF, 5%, 100V, C0G, 0603 TDK, C1608C0G2A561J080AA
41 8 D28–35 DIODE, SCHOTTKY, SMA_2C FAIRCHILD, S100
43 16 D37–52 DIODE, TVS, 36V, SMB_2C STM, SM6T36A
50 8 J21–28 CONNECTOR, M12, 5 PIN PHOENIX, 1694237
64 8 Q11–18 XSTR, 100V N-CH MOSFET SOT-223 FAIRCHILD, FQT7N10LTF
95 8 R59–66 RES, 0.2Ω, 1%, 1206 SUSUMU, RL1632R-R200-F
96 2 R67–68 RES, 4.7k, 1%, 0402 VISHAY, CRCW04024K70FKED
97 8 R69–76 RES, 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA
102 1 R107 RES, 1Ω, 1%, 0603 VISHAY, CRCW06031R00FKEA
123 2 U7–8 IC, QUAD IO-LINK MASTER LINEAR TECH, LTC2874IUHF
Optional Enclosure
134 0 ---- HOUSING, BASE DIGI-KEY, 2200939-ND
135 0 ---- HOUSING, SIDE DIGI-KEY, 2200952-ND
136 0 ---- HOUSING, FRONT PLATE DIGI-KEY, 2200947-ND
137 0 ---- SHEET METAL SCREW, PAN PHILLIPS #6

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DEMO MANUAL DC2228A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
BoarD photo
Reverse Side
The schematic is found here: www.linear.com/demo/DC2228A

20
dc2228af
DEMO MANUAL DC2228A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
LT 0415 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
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observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
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1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation