rtd IM35M220HR User manual

RTD Embedded Technologies, Inc.
AS9100 and ISO 9001 Certified
IM35M220HR / IM25M220HR
Dual M.2 B-Key Carrier Module
User’s Manual
BDM-610020162 Rev. A

RTD Embedded Technologies, Inc.
103 Innovation Boulevard
State College, PA 16803 USA
Telephone: [phone]
Fax: [phone]
www.rtd.com
[email protected]
[email protected]

RTD Embedded Technologies, Inc. | www.rtd.com iii IM35M220HR / IM25M2200HR User’s Manual
Revision History
Rev A 12/08/2023 Initial Release
Advanced Analog I/O, Advanced Digital I/O, aAIO, aDIO, a2DIO, Autonomous SmartCal, “Catch the Express”, cpuModule, dspFramework, dspModule, expressMate, ExpressPlatform, HiDANplus, “MIL Value for
COTS prices”, multiPort, PlatformBus, and PC/104EZ are trademarks, and “Accessing the Analog World”, dataModule, IDAN, HiDAN, RTD, and the RTD logo are registered trademarks of RTD Embedded
Technologies, Inc (formerly Real Time Devices, Inc.). PS/2 is a trademark of International Business Machines Inc. PCI, PCI Express, and PCIe are trademarks of PCI-SIG. PC/104, PC/104-Plus, PCI-104, PCIe/104,
PCI/104-Express and 104 are trademarks of the PC/104 Embedded Consortium. All other trademarks appearing in this document are the property of their respective owners.
Failure to follow the instructions found in this manual may result in damage to the product described in this manual, or other components of the system. The procedure set forth in this manual shall only be performed
by persons qualified to service electronic equipment. Contents and specifications within this manual are given without warranty, and are subject to change without notice. RTD Embedded Technologies, Inc. shall not
be liable for errors or omissions in this manual, or for any loss, damage, or injury in connection with the use of this manual.
Copyright © 2024 by RTD Embedded Technologies, Inc. All rights reserved.

RTD Embedded Technologies, Inc. | www.rtd.com iv IM35M220HR / IM25M2200HR User’s Manual
Table of Contents
1Introduction 6
Product Overview........................................................................................................................................................................ 6
1.1.1 B-Key description 6
1.1.2 Examples of M.2 Cards that can be used. 6
Board Features ........................................................................................................................................................................... 7
Ordering Information................................................................................................................................................................... 8
Contact Information .................................................................................................................................................................... 8
1.4.1 Sales Support 8
1.4.2 Technical Support 8
2Specifications 9
Board Operating Conditions ....................................................................................................................................................... 9
Board Electrical Characteristics.................................................................................................................................................. 9
Third-Party M.2 B-Key Operating Conditions ............................................................................................................................. 9
Physical Characteristics............................................................................................................................................................ 10
3Board Connections and Functionality 11
Board Handling Precautions ..................................................................................................................................................... 11
Steps for Installing .................................................................................................................................................................... 11
Connector Locations................................................................................................................................................................. 12
Attaching M.2 Modules ............................................................................................................................................................. 13
Functional Block Diagram......................................................................................................................................................... 14
Connector Functionality ............................................................................................................................................................ 15
3.6.1 Bus Connectors 15
3.6.2 Internal and External I/O Connectors 15
4IDAN Connections 17
Module Handling Precautions................................................................................................................................................... 17
Physical Characteristics............................................................................................................................................................ 17
Steps for Installing .................................................................................................................................................................... 18
5Troubleshooting 19
6Additional Information 20
PC/104 Specifications............................................................................................................................................................... 20
PCI and PCI Express Specification .......................................................................................................................................... 20
7Limited Warranty 21

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Table of Figures
Figure 1 B-Key Identification.................................................................................................................................................................................... 6
Figure 2 Images of PCI/104-Express and PCIe/104 Models Respectfully .............................................................................................................. 8
Figure 3: Board Dimensions .................................................................................................................................................................................. 10
Figure 4: Example 104™Stack............................................................................................................................................................................... 11
Figure 5: Connector Locations (Top View) ............................................................................................................................................................. 12
Figure 6 M.2 Fasteners.......................................................................................................................................................................................... 13
Figure 7: Block Diagram ........................................................................................................................................................................................ 14
Figure 8: IDAN Dimensions .................................................................................................................................................................................... 17
Figure 9: Example IDAN System ............................................................................................................................................................................ 18
Table of Tables
Table 1: Ordering Options ........................................................................................................................................................................................ 8
Table 2: Operating Environment and Storage Conditions ........................................................................................................................................ 9
Table 3: Supply Voltage Requirements .................................................................................................................................................................... 9
Table 4: Power Ratings ............................................................................................................................................................................................ 9
Table 5: Bus Connectors ....................................................................................................................................................................................... 15
Table 6: I/O Connectors......................................................................................................................................................................................... 15
Table 7: M.2 B-Key Pin Assignments ..................................................................................................................................................................... 16

RTD Embedded Technologies, Inc. | www.rtd.com 6IM35M220HR / IM25M220HR User’s Manual
1Introduction
Product Overview
RTD’s IM35M220HR / IM25M220HR modules offer dual M.2 B-Key sockets, designed to permit integration of third-party M.2 B-Key modules
into rugged PCIe/104 systems and enclosures. M.2 B-Key is a form factor for devices which supports both PCI Express and USB 3.0
connectivity and offer support for a cellular device with a single or dual SIM card attachment.
A x1 PCI Express connection is provided to each of the two M.2 B-Key sockets using two upstream x1 PCI Express links from the PCIe/104
bus.
Both M.2 sockets contain USB Super Speed sourced by a USB Super Speed hub that derives its’ bandwidth from a single USB Super Speed
connection from the PCIe/104 bus.
For devices installed in the dual M.2 B-Key sockets of the IM35M220HR / IM25M220HR-- referred to as Sockets A and B throughout this
hardware manual (or designators CN5 and CN6, respectively).
The dual sockets on the IM35M220HR / IM25M220HR permit mounting of 38mm, 48mm, and 76mm M.2 B-Key modules, allowing maximum
flexibility with the specification.
1.1.1 B-KEY DESCRIPTION
A M.2 card with B-Key has pins 12 through 19 missing for the keying position. The card can be easily identified because there are 6 pins on
one side and 5 pins on the other before the keying position. Be careful not to confuse it with a M-Key which has 5 pins on one side of the key
and 4 on the other side.
Figure 1 B-Key Identification
1.1.2 EXAMPLES OF M.2 CARDS THAT CAN BE USED.
Sierra Wireless EM7421 Q-M2M-110468 Cellular modem
Quectel 5G RM521F-GLCellular Module
Delkin Devices, Inc. MB2HFRCFD-80000-2 NVME

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Board Features
•PCI Express Universal Connector
oPermits compatibility with PCIe/104 Type 1 and Type 2 cpuModules
oCPU_DIR pin permits stacking above or below the CPU
o+5V-only operation
•Onboard PCIe Switch and USB 3.0 hub
oDual sockets require two x1 PCI Express link and/or one USB 3.0 link for operation
oUSB 3.0 link repopulation
•Dual M.2 B-Key Card Sockets
oEach socket supports three modes of operation
▪Single x1 PCIe link and single USB 3.0 link
▪Single x1 PCIe link
▪Single USB 3.0 link
oMounting holes permit installation of 42mm, 52mm, and 80mm sized M.2 B-Key modules

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Ordering Information
The IM35M220HR / IM25M220HR are available with the following options:
Table 1: Ordering Options
Part Number
Description
IM35M220HR
Dual M.2 B-Key sockets, PCIe/104
IDAN-IM35M220HR
Dual M.2 B-Key sockets, PCIe/104; in IDAN enclosure
IM25M220HR
Dual M.2 B-Key sockets, PCI/104-Express
IDAN-IM25M220HR
Dual M.2 B-Key sockets, PCI/104-Express; in IDAN enclosure
The Intelligent Data Acquisition Node (IDAN™) building block can be used in just about any combination with other IDAN building blocks to
create a simple but rugged 104™ stack. This module can also be incorporated in a custom-built RTD HiDAN™ or HiDANplus High Reliability
Intelligent Data Acquisition Node. Contact RTD sales for more information on our high reliability systems.
Figure 2 Images of PCI/104-Express and PCIe/104 Models Respectfully
Contact Information
1.4.1 SALES SUPPORT
For sales inquiries, you can contact RTD Embedded Technologies sales via the following methods:
Phone: [phone] Monday through Friday, 8:00am to 5:00pm (EST).
E-Mail: [email protected]
1.4.2 TECHNICAL SUPPORT
If you are having problems with your system, please try the steps in the Troubleshooting section of this manual.
For help with this product, or any other product made by RTD, you can contact RTD Embedded Technologies technical support via the
following methods:
Phone: [phone] Monday through Friday, 8:00am to 5:00pm (EST).
E-Mail: [email protected]

RTD Embedded Technologies, Inc. | www.rtd.com 9IM35M220HR / IM25M220HR User’s Manual
2Specifications
Board Operating Conditions
Table 2: Operating Environment and Storage Conditions
Symbol
Parameter
Test Condition
Min
Max
Unit
Ta
Operating Temperature
-40
+85
C
Ts
Storage Temperature
-55
+125
C
RH
Relative Humidity
Non-Condensing
0
90%
%
NOTE: The Operating Environment and Storage Conditions listed in Table 2
apply to the IM35M220HR / IM25M220HR board only. For
recommended operating conditions of third-party M.2 B-Key modules,
refer to documentation from the manufacturer.
Board Electrical Characteristics
The bus connectors on the IM35M220HR / IM25M220HR offer several voltage inputs. Only +5V is required for operation and is used to
generate the voltage requirements for both M.2 B-Key sockets. All other bus connector supply voltages are pass-through and unused by the
IM35M220HR / IM25M220HR.
Table 3: Supply Voltage Requirements
Symbol
Parameter
Note
Min
Max
Unit
Vcc5
5 V Supply Voltage
4.75
5.25
V
Supply current and power consumption for the IM35M220HR / IM25M220HR are listed in the table below.
Table 4: Power Ratings
Symbol
Parameter
Test Condition
Min
Max
Unit
P
Board Power Consumption
Vcc5 = 5.0 V, Typical
TBD
W
Icc5
5 V Input Supply Current
Active
TBD
mA
M.2 B-Key –Peak Current per Socket
Icc3.3
3.3 V Input Supply Current
Peak current; Socket A or B
TBD
A
M.2 B-Key –Combined Current (Sockets A and B)
Icc3.3
3.3 V Input Supply Current
Combined current; Socket A + B
TBD
A
NOTE: Board Power Consumption was recorded with no devices installed in
the M.2 B-Key sockets.
Third-Party M.2 B-Key Operating Conditions
Each third-party M.2 B-Key module has its own individual operating conditions which will vary from one manufacturer’s device to another.
Installing third party M.2 B-Key modules on the IM35M220HR / IM25M220HR can affect the overall operating temperature of the system. Make
sure to verify the operating conditions of third-party M.2 B-Key modules before using the IM35M220HR / IM25M220HR in extreme conditions.

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Physical Characteristics
•IMx5M220HR Weight: Approximately 69 g (0.152 lbs.)
•Dimensions: 90.17 mm L x 95.89 mm W (3.550 in L x 3.775 in W)
Figure 3: Board Dimensions

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3Board Connections and Functionality
Board Handling Precautions
To prevent damage due to Electrostatic Discharge (ESD), keep your board in its antistatic bag until you are ready to install it into your system.
When removing it from the bag, hold the board at the edges, and do not touch the components or connectors. Handle the board in an antistatic
environment, and use a grounded workbench for testing and handling of your hardware.
Steps for Installing
1. Always work at an ESD protected workstation, and wear a grounded wrist-strap.
2. Turn off power to the system or stack.
3. Select and install stand-offs to properly position the module on the stack.
4. Remove the module from its anti-static bag.
5. Check that pins of the bus connector are properly positioned.
6. Check the stacking order; make sure all of the busses used by the peripheral cards are connected to the cpuModule.
7. Hold the module by its edges and orient it so the bus connector pins line up with the matching connector on the stack.
8. Gently and evenly press the module onto the stack.
9. If any boards are to be stacked above this module, install them.
10. Attach any necessary cables to the stack.
11. Re-connect the power cord and apply power to the stack.
12. Boot the system and verify that all of the hardware is working properly.
Figure 4: Example 104™Stack

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Connector Locations
The following top-side photo of the IM35M220HR / IM25M220HR provides a reference for designators of the bus connectors, I/O connectors as
well as their locations.
Figure 5: Connector Locations (Top View)
Socket A
(CN5)
Socket B
(CN6)
Factory Use Only
(CN8)
SIM 2 (Top)
(CN4)
SIM 1 (Bot)
(CN7)
PCI Connector (CN3) (if populated)
PCIe Connectors
(CN1 –top, CN2 - bottom)

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Attaching M.2 Modules
The IM35M220 / IM25M220 carrier is shipped with mounting fasteners for M.2 modules. There should be two 4mm screws, two 8mm screws,
two nuts and two washers. All components are for M2.5 x 0.45mm fasteners. The figure below shows how to fasten a third-party M.2 module
to the carrier. Insert the metal spacer in the carrier, run the 8mm screw down to tighten the M.2 module to the spacer, then apply the washer
and nut to the bottom of the board. Two spacers are already soldered to the board for the 80mm position, and it takes the 4mm screw with no
washer.
Figure 6 M.2 Fasteners

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Functional Block Diagram
The Figure below shows the diagram of the IM35M220HR / IM25M220HR’s dual M.2 B-Key sockets and their respective breakout and I/O
connectors. The various parts of the block diagram are discussed in the following sections.
Figure 7: Block Diagram
PCI Express Bus Connector (CN2)
USB SS Hub
PCI Express Bus Connector (CN1)
PCI-104 Connector –(CN3)
PCIe
Mux
2 PCIe x1
USB 3.0 (Repopulation)
USB 3.0 Link
USB 3.0 Link
PCIe x1 Link
PCIe x1 Link
2 PCIe x1
USB 3.0
M.2 B-Key (CN6)
M.2 B-Key (CN5)
Dual SIM slots

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Connector Functionality
3.6.1 BUS CONNECTORS
Table 5: Bus Connectors
Connector
Function
Size and Pitch
Mating Connector
CN1
PCIe/104 Universal Bus (Top)
156-pin, 0.635mm
Samtec ASP-129646-03
CN2
PCIe/104 Universal Bus (Bottom)
156-pin, 0.635mm
Samtec ASP-129637-03
CN3
PCI-104 (PCI) Bus
120-pin, 2mm
Samtec ESQT-130-02-G-Q-368
PCIe Connectors (CN1 –Top, CN2 –Bottom)
The IM35M220HR / IM25M220HR is a “Universal” board and can connect to either a Type 1 or Type 2 connector of a PCIe/104 or PCI-104
Express system. The position and pin assignments are compliant with the PCIe/104 Specification. (See PC/104 Specifications on page 20)
PCI Connector (CN3)
This connector (if populated) is used as a pass-through connector only. Only ground is the only pins attached to copper.
3.6.2 INTERNAL AND EXTERNAL I/O CONNECTORS
The IM35M220HR / IM25M220HR offers two sockets for installing a third-party M.2 B-Key module, Socket A (CN5) and Socket B (CN6).
Table 6: I/O Connectors
Socket A
Function
Connector
CN5
M.2 B-key, Socket A
(Refer to PCI Express M.2 Specification)
CN4
SIM Socket Top
TE Connectivity Push-Push model 2229333
CN7
SIM Socket Bottom
TE Connectivity Push-Push model 2229333
Socket B
Function
Connector
CN6
M.2 B-key, Socket B
(Refer to PCI Express M.2 Specification)

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M.2 B-Key Sockets A and B (CN3, CN4)
The offers two soldered-down connectors that support third party M.2 B-Key modules.
Sockets A and B (or designators CN5 and CN6) each offer one downstream x1 PCI Express Gen 2 link and one downstream USB 3.0 link from
the host cpuModule to the M.2 B-Key device installed in the socket. For maximum flexibility, the module provides mounting holes for cards
designed to several length card M.2 B-Key form factors.
The pinout for each M.2 B-Key connector is shown below.
Table 7: M.2 B-Key Pin Assignments
Pin Name
#
#
Pin Name
3.3V
2
1
CONFIG3
3.3V
4
3
GND
PWR_OFF# 3.3V
6
5
GND
N/C
8
7
USB_HS_D+
LED 1#
10
9
USB_HS_D-
-Key-
12
11
GND
-Key-
14
13
-Key-
-Key-
16
15
-Key-
-Key-
18
17
-Key-
N/C
20
19
-Key-
N/C
22
21
CONFIG0
N/C
24
23
N/C
N/C
26
25
N/C
N/C
28
27
GND
SIM 1 RST
30
29
USB_SS_R-
SIM 1 CLK
32
31
USB_SS_R+
SIM 1 DATA
34
33
GND
SIM 1 PWR
36
35
USB_SS_T-
N/C
38
37
USB_SS_T+
SIM 2 DET
40
39
GND
SIM 2 DATA
42
41
PER0+
SIM 2 CLK
44
43
PER0-
SIM 2 RST
46
45
GND
SIM 2 PWR
48
47
PET0-
PE_RST
50
49
PET0+
N/C
52
51
GND
N/C
54
53
REFCLK-
N/C
56
55
REFCLK+
N/C
58
57
GND
N/C
60
59
N/C
N/C
62
61
N/C
N/C
64
63
N/C
SIM 1 DET
66
65
N/C
SUSCLK
68
67
N/C
3.3V
70
69
CONFIG1
3.3V
72
71
GND
3.3V
74
73
GND
75
CONFIG2

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4IDAN Connections
Module Handling Precautions
To prevent damage due to Electrostatic Discharge (ESD), keep your module in its antistatic bag until you are ready to install it into your system.
When removing it from the bag, hold the module by the aluminum enclosure, and do not touch the components or connectors. Handle the
module in an antistatic environment, and use a grounded workbench for testing and handling of your hardware.
Physical Characteristics
•Weight: Approximately 0.230 Kg (0.508 lbs.)
•Dimensions: 152mm L x 130 mm W x 17.0 mm H (5.98 in L x 5.12 in W x 0.67 in H)
Figure 8: IDAN Dimensions

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Steps for Installing
1. Always work at an ESD protected workstation, and wear a grounded wrist-strap.
2. Turn off power to the IDAN system.
3. Remove the module from its anti-static bag.
4. Check that pins of the bus connector are properly positioned.
5. Check the stacking order; make sure all of the busses used by the peripheral cards are connected to the cpuModule.
6. Hold the module by its edges and orient it so the bus connector pins line up with the matching connector on the stack.
7. Gently and evenly press the module onto the IDAN system.
8. If any boards are to be stacked above this module, install them.
9. Finish assembling the IDAN stack by installing screws of an appropriate length.
10. Attach any necessary cables to the IDAN system.
11. Re-connect the power cord and apply power to the stack.
12. Boot the system and verify that all of the hardware is working properly.
Figure 9: Example IDAN System

RTD Embedded Technologies, Inc. | www.rtd.com 19 IM35M220HR / IM25M220HR User’s Manual
5Troubleshooting
If you are having problems with your system, please try the following initial steps:
•Simplify the System –Remove modules one at a time from your system to see if there is a specific module that is causing a
problem. Perform you troubleshooting with the least number of modules in the system possible.
•Swap Components –Try replacing parts in the system one at a time with similar parts to determine if a part is faulty or if a type of
part is configured incorrectly.
If problems persist, or you have questions about configuring this product, contact RTD Embedded Technologies via the following methods:
Phone: [phone]
E-Mail: [email protected]
Be sure to check the RTD web site (http://www.rtd.com) frequently for product updates, including newer versions of the board manual and
application software.

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6Additional Information
PC/104 Specifications
A copy of the latest PCI/104-Express™& PCIe/104™ Specification can be found on the webpage for the PC/104 Embedded Consortium:
www.pc104.org
PCI and PCI Express Specification
A copy of the latest PCI and PCI Express specifications can be found on the webpage for the PCI Special Interest Group:
www.pcisig.com
PCI Express M.2 Specification
A copy of the latest PCI Express M.2 Specification can also be found on the webpage for the PCI Special Interest Group:
www.pcisig.com