Fibocom FM350-GL Installation instructions

FM350-GL Hardware Guide _General
Version: V1.0.5
Date: 2020-03-12

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 2 of 59
Applicability Table
No.
Product model
Description
1
FM350-GL-00
NA

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 3 of 59
Copyright
Copyright © 2020 Fibocom Wireless Inc. All rights reserved.
Without the prior written permission of the copyright holder, any company or individual is prohibited to
excerpt, copy any part of or the entire document, or distribute the document in any form.
Notice
The document is subject to update from time to time owing to the product version upgrade or other reasons.
Unless otherwise specified, the document only serves as the user guide. All the statements, information
and suggestions contained in the document do not constitute any explicit or implicit guarantee.
Trademark
The trademark is registered and owned by Fibocom Wireless Inc.
Change History
Version
Author
Date
Remark
V1.0.5
Randy
2021-03-12
● Update LTE UL to Release 15
V1.0.4
Xiaodequan
2021-02-06
● Update Phase2 feature
V1.0.3
Leidaijun
2020-11-11
● Update Power Sequence
V1.0.2
Xiaodequan
2020-09-15
● Update n25, n30
● Update PCIe impedance requirement
V1.0.1
Leidaijun
2020-6-30
● Update pin definition
● Update FCPO# and RESET# recommended design
● Update WWAN M.2 module type configuration
V1.0.0
Leidaijun
2020-4-30
Draft version

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 4 of 59
Contents
1Foreword....................................................................................................................... 7
1.1 Introduction...................................................................................................................7
1.2 Reference Standard .....................................................................................................7
1.3 Related Documents ......................................................................................................8
2Overview ....................................................................................................................... 8
2.1 Introduction...................................................................................................................8
2.2 Specification .................................................................................................................8
2.3 Application Block ........................................................................................................10
2.4 Hardware Block Diagram............................................................................................ 11
2.5 Antenna Configuration................................................................................................ 11
3Application Interface...................................................................................................13
3.1 M.2 Interface ..............................................................................................................13
Pin Map ......................................................................................................................... 13
Pin Definition .................................................................................................................14
3.2 Power Supply .............................................................................................................18
Power Supply ................................................................................................................18
Logic level .....................................................................................................................19
3.3 Control Signal.............................................................................................................20
Module Start-Up ............................................................................................................20
3.3.1.1 Start-up Circuit...........................................................................................................................20
3.3.1.2 Start-up Timing Sequence .........................................................................................................21
Module Shutdown .........................................................................................................22
Module Reset ................................................................................................................22
PCIe Link State .............................................................................................................24
3.3.4.1 D0 L1.2......................................................................................................................................24
3.3.4.2 D3cold L2.....................................................................................................................................25
Timing application .........................................................................................................26
3.4 PCIe Interface ............................................................................................................26
PCIe Interface Definition ...............................................................................................27
PCIe Interface Application............................................................................................. 27
3.5 USIM Interface............................................................................................................29
USIM Pins .....................................................................................................................29
USIM Interface Circuit...................................................................................................30

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 5 of 59
3.5.2.1 N.C. SIM Card Slot ....................................................................................................................30
3.5.2.2 N.O. SIM Card Slot....................................................................................................................30
USIM Hot-Plug ..............................................................................................................31
USIM Design .................................................................................................................31
3.6 Status Indicator...........................................................................................................32
LED#1 Signal ................................................................................................................32
WOWWAN# ..................................................................................................................33
3.7 Interrupt Control..........................................................................................................34
W_DISABLE1#..............................................................................................................34
BODYSAR..................................................................................................................... 34
3.8 ANT Tunable Interface................................................................................................34
3.9 Configuration Interface ...............................................................................................35
4Radio Frequency .........................................................................................................36
4.1 RF Interface................................................................................................................36
RF Interface Functionality ............................................................................................. 36
RF Connector Characteristic.........................................................................................36
RF Connector Dimension..............................................................................................37
RF Connector Assembly ...............................................................................................38
4.2 Operating Band ..........................................................................................................39
4.3 Transmitting Power.....................................................................................................41
4.4 Antenna Design..........................................................................................................43
5ESD Characteristics ....................................................................................................46
6Structure Specification ...............................................................................................47
6.1 Product Appearance ...................................................................................................47
6.2 Dimension of Structure ...............................................................................................47
6.3 M.2 Interface Model....................................................................................................48
6.4 M.2 Connector............................................................................................................49
6.5 Storage.......................................................................................................................50
Storage Life................................................................................................................... 50
6.6 Packing ......................................................................................................................50
Tray Package ................................................................................................................ 50
Tray size ........................................................................................................................52
7CE Conformance information.....................................................................................53
8FCC Conformance information ..................................................................................53

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 6 of 59
9ISED Conformance information .................................................................................57

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 7 of 59
1 Foreword
1.1 Introduction
The document describes the electrical characteristics, RF performance, dimensions and application
environment, etc. of FM350-GL (hereinafter referred to as FM350). With the assistance of the document
and other instructions, the developers can quickly understand the hardware functions of FM350 modules
and develop products.
1.2 Reference Standard
The design of the product complies with the following standards:
⚫3GPP TS 38.300 V15.5.0 : 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; NR; NR and NG-RAN Overall Description; Stage 2
⚫3GPP TS 38.521-1 V15.2.0 : User Equipment (UE) conformance specification; Radio transmission
and reception; Part 1: Range 1 Standalone
⚫3GPP TS 38.521-3 V15.2.0 :User Equipment (UE) conformance specification; Radio transmission
and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios
⚫3GPP TS 34.121-1 V8.11.0: User Equipment (UE) conformance specification; Radio transmission
and reception (FDD);Part 1: Conformance specification
⚫3GPP TS 34.122 V14.0.0: Technical Specification Group Radio Access Network; Radio transmission
and reception (TDD)
⚫3GPP TS 36.521-1 V14.0.0: User Equipment (UE) conformance specification; Radio transmission
and reception; Part 1: Conformance testing
⚫3GPP TS 21.111 V10.0.0: USIM and IC card requirements
⚫3GPP TS 51.011 V4.15.0: Specification of the Subscriber Identity Module -Mobile Equipment (SIM-
ME) interface
⚫3GPP TS 31.102 V10.11.0: Characteristics of the Universal Subscriber Identity Module (USIM)
application
⚫3GPP TS 31.11 V10.16.0: Universal Subscriber Identity Module (USIM) Application Toolkit(USAT)
⚫3GPP TS 36.124 V10.3.0: Electro Magnetic Compatibility (EMC) requirements for mobile terminals
and ancillary equipment
⚫3GPP TS 27.007 V10.0.8: AT command set for User Equipment (UE)
⚫3GPP TS 27.005 V10.0.1: Use of Data Terminal Equipment - Data Circuit terminating Equipment
(DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)
⚫PCI Express M.2 Specification Rev1.2

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 8 of 59
1.3 Related Documents
⚫FIBOCOM Design Guide_RF Antenna
2 Overview
2.1 Introduction
FM350 is a highly integrated 5G Sub-6 WWAN module which uses M.2 form factor interface. It supports
NR/LTE /WCDMA systems and can be applied to most cellular networks of mobile carrier in the world.
2.2 Specification
Specification
Operating Band
LTE FDD: B1, B2, B3, B4, B5, B7, B8, B12, B13, B14, B17, B18, B19, B20, B25,
B26, B28, B29, B30, B32, B66, B71
LTE TDD: B34, B38, B39, B40, B41, B42, B43, B46, B48
NR: n1, n2, n3, n5, n7, n8, n20, n25, n28, n30, n38, n40, n41, n481), n66, n71,
n77, n78, n79
WCDMA/HSPA+: Band 1, 2, 4, 5, 8
GNSS
Support GPS, GLONASS, Galileo, BDS, QZSS
NR
3GPP Release 15
LTE
3GPP Release 15
UMTS
3GPP Release 8
Feature
NR:
DL 4*4 MIMO：n1, n2, n3, n7, n25, n30, n38, n40, n41, n48, n66, n77, n78, n79
UL 2*2 MIMO：n41, n77, n78, n79
LTE:
DL 4*4 MIMO：B1, B2, B3, B4, B7, B25, B30, B34, B38, B39, B40,
B41, B42, B43, B48, B66
NSA and SA supported
SRS: n41, n77, n78, n79, Support: 1T2R, 1T4R, 2T4R
HPUE: B41, n41, n772), n78, n79
TX Switching
WCDMA: B1, B2, B4
LTE: B1, B2, B3, B4, B7, B25, B30, B34, B38, B39, B40, B41, B42, B43, B48,
B66
NR: n1, n2, n3, n7, n25, n30, n38, n40, n41,n48, n66, n77, n78, n79

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 9 of 59
Specification
Data Transmission
SA 5G/NR Sub-6 Peak
DL 4.67Gbps/ UL 1.25Gbps3)
NSA Peak
DL 3.74Gbps/ UL 835Mbps4)
LTE
DL 1.6Gbps (CAT19)/ UL 211Mbps(CAT18)5)
UMTS/HSPA+
DL UMTS:384 kbps/ UL 384 kbps
DL DC-HSPA+:42 Mbps (CAT24)/ UL 11.5 Mbps (CAT7)
Carrier Aggregation
LTE DL 5CA, UL 2CA
NR DL 2CA, UL 2CA
ENDC DL LTE 5CA+ NR 1CA, LTE 3CA+ NR 2CA , UL LTE 2CA+ NR 1CA
Power Supply
DC 3.135V～4.4V, Typical 3.3V
Temperature
Normal operating temperature: -10°C ～+55°C
Extended operating temperature: -30°C ～+75°C
Storage temperature: -40°C～+85°C
Physical
Characteristics
Interface: M.2 Key-B
Dimension：30 x 52 x 2.3mm
Weight: 8g
Interface
Antenna Connector
WWAN Antenna x 4
Support 4x4 MIMO
Function Interface
Dual SIM (one built-in eSIM), 1.8V/3V
PCIe Gen3 X1
USB 2.0 (For debug)
USB 3.1 Gen1 (Reserved)
W_Disable#
BodySAR
LED
Tunable antenna
I2C (Reserved)
UART (Reserved)
Software
Protocol Stack
IPV4/IPV6
AT Commands
3GPP TS 27.007 and 27.005
Firmware Update
PCIe

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 10 of 59
Specification
Other Feature
Multiple carrier
Windows update
1) Disabled for FCC cannot certify currently, will enable in future after FCC can certify
2) n77 support HPUE, target power is 25+1/-1dBm
3) NR UL 2.5Gbps is under investigating for future
4) NSA DL 4.45Gbps is under investigating for future
5) LTE UL 225Mbps(CAT20) is under investigating for future
Note:
When temperature goes beyond normal operating temperature range of -10°C~+55°C, RF
performance of module may be slightly off 3GPP specifications.
2.3 Application Block
The peripheral applications for FM350 module are shown in Figure 2-1:
Module
SIM1 USB2.0/
USB3.0
Power
Supply ON/OFF# RESET#
Control
EINT Indicator
Host application
ANT3(D/G) ANT0(M)
SIM
Card
PCIe
ANT2(M2) ANT1(M1)
eSIM
Figure2-1 Application Block

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 11 of 59
2.4 Hardware Block Diagram
The hardware block diagram in Figure 2-2 shows the main hardware functions of FM350 module, including
base band and RF functions.
Baseband contains the followings: RF contains the followings:
● 5G NR/LTE/UMTS controller ● RF Transceiver
● PMU ● RF ET Power/PA
● MCP (NAND+LPDDR4 RAM) ● RF PAMid/Front end
● Application interface ● RF SW
● RF Multi-plexer/Filter
+3.3V
FUL_CARD_POWER_OFF#
RESET#
PCIe
USB2.0
USB 3.0
USIM1
EINT
WOWWAN#
LED
I2C
UART
ANT_TUNER_1V8
MIPI_RFFE
Tunable ANT
Baseband
(NR/LTE FDD/LTE TDD/UMTS
controller)
PMU
PA ET0
DCDC
DRX
RF Part
M.2 Key-B 75pin interface
ANT3
(D/G)
ANT0
(M)
GNSS LNA
RF
Transceiver
TCXO
Triplexer Triplexer
MB/HB
PAMiD
TXA0
PRX
DPDT
LB
PAMiD
ANT2
(M2)
ANT1
(M1)
DRX2
PRX2
GNSS
SAW
GNSS
Receiver
DRF
MCP
(NAND+LPDDR4)
MIPI RFFE
IQ
eSIM
Diplexer
Diplexer
UHB Main
PAMid
UHB Comp
PAMid
UHB/XB DRX
(4x4 MIMO)
SAW/
LNA
UHB/XB DRX
(4x4 MIMO)
SAW/
LNA
PA ET1
DCDC
TXA1
Multi-
plexer
SPDT
N41 PA
DPDT
DPDT
SP3T
SPDT
M/HB FEM
(4x4 MIMO)
GNSS
Extractor
SPDT
Figure 2-2 Hardware block diagram
2.5 Antenna Configuration
FM350 module supports four antennas and the configuration is as below table:
Antenna Connector
Function Description
Band configuration
Frequency Rang
(MHz)
ANT0(Main)
Main antenna port for
TRX and SRS
All supported bands transmit &
receive and SRS
617~5925
ANT1(M1)
Antenna port for RX and
SRS
4x4 MIMO supported bands receive
and SRS
1805~5000
ANT2(M2)
Antenna port for TRX
and SRS
Transmit, 4x4 MIMO receive and
SRS
1452~5000
ANT3(D/G)
Diversity & GNSS ANT
and SRS
All supported
bands and GNSS receive, SRS
617~5925

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 12 of 59

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 13 of 59
3 Application Interface
3.1 M.2 Interface
The FM350 module applies standard M.2 Key-B interface, with a total of 75 pins.
Pin Map
Figure 3-1 Pin Map
Note:
Pin “Notch” represents the gap of the gold fingers.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 14 of 59
Pin Definition
The pin definition is as below table:
Pin
Pin Name
I/O
Reset Value
Pin Description
Level
1
CONFIG_3
O
NC
NC, FM350 M.2 module is configured as
the WWAN –PCIe Gen3, USB3.1 Gen1
interface type
-
2
+3.3V
PI
-
Power input
Power Supply
3
GND
-
-
GND
Power Supply
4
+3.3V
PI
-
Power input
Power Supply
5
GND
-
-
GND
Power Supply
6
FULL_CARD_
POWER_OFF#
I
PU
Power enable, module power on input,
internal pull up(350KΩ)
3.3/1.8V
7
USB D+
I/O
-
USB data plus
0.3---3V
8
W_DISABLE1#
I
WWAN disable, active low
3.3/1.8V
9
USB D-
I/O
-
USB data minus
0.3---3V
10
LED1#
OD
-
System status LED, output open drain,
3.3V
3.3V
11
GND
-
-
GND
Power Supply
12
Notch
Notch
13
Notch
Notch
14
Notch
Notch
15
Notch
Notch
16
Notch
Notch
17
Notch
Notch
18
Notch
Notch
19
Notch
Notch
20
GPIO
I/O
GPIO.
Reserved
1.8V
21
CONFIG_0
O
NC
GND, FM350 M.2 module is configured
as the WWAN –PCIe Gen3, USB3.1
Gen1 interface type
-
22
UART_TX
O
-
UART TXD output, can mux as
ANT_TUNER_CFG or GPIO.
Reserved
1.8V
23
WOWWAN#
O
-
Wake up host, Reserved
1.8V
24
ANT_TUNER_1V8
O
-
1.8V power output for antenna tuner, can
mux as GPIO.
1.8V

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 15 of 59
Pin
Pin Name
I/O
Reset Value
Pin Description
Level
Reserved
25
DPR
I
Dynamic power reduction - Body SAR
control signal (SAR_BACK_OFF)
3.3/1.8V
26
W_DISABLE2#
I
GNSS disable, active low, Reserved
3.3/1.8V
27
GND
-
-
GND
Power Supply
28
UART_RX
I
UART RXD input, can mux as DPR2 or
GPIO.
Reserved
1.8V
29
USB3.0_TX-
O
-
USB3.0 transmit data minus, reserved
-
30
UIM_RESET
O
SIM reset signal
1.8V/3V
31
USB3.0_TX+
O
-
USB3.0 transmit data plus, reserved
-
32
UIM_CLK
O
SIM clock Signal
1.8V/3V
33
GND
-
-
GND
Power Supply
34
UIM_DATA
I/O
SIM data input/output
1.8V/3V
35
USB3.0_RX-
I
-
USB3.0 receive data minus, reserved
-
36
UIM_PWR
O
-
SIM power supply, 1.8V/3V
1.8V/3V
37
USB3.0_RX+
I
-
USB3.0 receive data plus, reserved
-
38
NC
-
NC
-
39
GND
-
-
GND
Power Supply
40
I2C_SCL
O
-
I2C master clock
1.8V
41
PETn0
O
-
PCIe TX differential signals
negative
-
42
I2C_SDA
I/O
I2C master data
1.8V
43
PETp0
O
-
PCIe TX differential signals positive
-
44
I2C_IRQ#
I
-
I2C interrupt request
1.8V
45
GND
-
-
GND
Power Supply
46
NC
-
-
-
-
47
PERn0
I
-
PCIe RX differential signals
negative
-
48
NC
-
-
-
-
49
PERp0
I
-
PCIe RX differential signals positive
-
50
PERST#
I
PU
Asserted to reset module PCIe interface
default. If module went into core dump, it
will reset whole module, not only PCIe
3.3/1.8V

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 16 of 59
Pin
Pin Name
I/O
Reset Value
Pin Description
Level
interface.
Active low, internal pull up(10KΩ)
51
GND
-
-
GND
Power Supply
52
CLKREQ#
I/O
-
Asserted by device to request a PCIe
reference clock be available (active clock
state) in order to transmit data. It also
used by L1 PM Sub states mechanism,
asserted by either host or device to
initiate an L1 exit.
Active low, open drain output and should
add external pull up on platform
3.3/1.8V
53
REFCLKN
I
-
PCIe reference clock signal
Negative
-
54
PEWAKE#
O
PD
Asserted to wake up system and
reactivate PCIe link from L2 to L0, it
depends on system
whether supports wake up functionality.
Active low, open drain output and should
add external pull up on platform
3.3/1.8V
55
REFCLKP
I
-
PCIe reference clock signal
Positive
-
56
RFFE_SCLK
O
-
MIPI interface tunable ANT,
RFFE clock
1.8V
57
GND
GND
Power Supply
58
RFFE_SDATA
I/O
-
MIPI interface tunable ANT,
RFFE data
1.8V
59
ANTCTL0
O
-
Tunable ANT CTRL0
1.8V
60
COEX3
I/O
-
Wireless coexistence between WWAN
and WiFi/BT modules, based on BT-SIG
coexistence protocol. COEX_EXT_FTA,
Reserved
1.8V
61
ANTCTL1
O
-
Tunable ANT CTRL1
1.8V
62
COEX_RXD
I
-
Wireless coexistence between WWAN
and WiFi/BT modules, based on BT-SIG
coexistence protocol. UART receive
signal(WWAN module side), Reserved
1.8V
63
ANTCTL2
O
-
Tunable ANT CTRL2
1.8V
64
COEX_TXD
O
-
Wireless coexistence between WWAN
and WiFi/BT modules, based on BT-SIG
coexistence protocol. UART transmit
signal(WWAN module side), Reserved
1.8V
65
ANTCTL3
O
-
Tunable ANT CTRL3
1.8V

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 17 of 59
Pin
Pin Name
I/O
Reset Value
Pin Description
Level
66
SIM1_DETECT
I
-
SIM1 detect, internal pull up(390KΩ),
active high
1.8V
67
RESET#
I
PU
WWAN reset input, active low, internal
pull up(350KΩ)
1.8V
68
NC
-
-
NC
-
69
CONFIG_1
O
GND
GND, FM350 M.2 module is configured
as the WWAN –PCIe Gen3, USB3.1
Gen1 interface type
-
70
+3.3V
PI
-
Power input
Power Supply
71
GND
-
-
GND
Power Supply
72
+3.3V
PI
-
Power input
Power Supply
73
VIO_CFG
-
NC
Configuration of PCIe sideband signals
power domain
NC: support 1.8V/3.3V;
GND: support 3.3V
-
74
+3.3V
PI
-
Power input
Power Supply
75
CONFIG_2
O
NC
GND, FM350 M.2 module is configured
as the WWAN –PCIe Gen3, USB3.1
Gen1 interface type
-
Reset Value: The initial status after module reset, not the status when working.
H: High Voltage Level
L: Low Voltage Level
PD: Pull-Down
PU: Pull-Up
T: Tristate
OD: Open Drain
PI: Power Input
PO: Power Output
Note:
Digital IO pins cannot be connected to power directly.
The unused pins can be left floating.

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 18 of 59
3.2 Power Supply
The power interface of FM350 module as shown in the following table:
Pin
Pin Name
I/O
Pin Description
DC Parameter (V)
Minimum
Value
Typical
Value
Maximum
Value
2, 4, 70, 72, 74
+3.3V
PI
Power supply input
3.135
3.3
4.4
36
UIM_PWR
PO
USIM power supply
-
1.8V/3V
-
The Power rating table is as below table:
FM350 module uses PCIe interface, according to the PCIe specification, the PCIe Vmain should be used
as the +3.3V power source, not the Vaux. The Vaux is the PCIe backup power source and it is not sufficient
as the power supply. In addition, the DC/DC power supply other than PCIe ports should not be used as
the external power cannot control the module status through the PCIe protocol.
Power Supply
The FM350 module should be powered through the +3.3V pins, and the power supply design is shown in
Figure 3-2:
Figure 3-2 Power supply design
The filter capacitor design for power supply as shown in the following table:
Pin
Pin Name
I/O
Pin Description
Current Consumption Limit
Max Avg(mA)
2, 4, 70, 72, 74
+3.3V
PI
Power supply input
3500
36
UIM_PWR
PO
USIM power supply
200

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 19 of 59
Recommended
capacitance
Application
Description
220uF x 2
Voltage-stabilizing capacitors
Reduce power fluctuations of the module in
operation, requiring capacitors with low ESR.
⚫LDO or DC/DC power supply requires the
capacitor of no less than 440uF
⚫The capacitor for battery power supply
can be reduced to 100~200uF
1uF, 100nF
Digital signal noise
Filter out the interference generated from the
clock and digital signals
39pF, 33pF
700/800, 850/900 MHz frequency
band
Filter out low frequency band RF interference
18pF, 10pF,
8.2pF, 6.8pF,
3.9pF
1500/1800, 2100/2300,
2600MHz, 3500/3600/3700MHz,
5GHz
Filter out medium/high frequency band RF
interference
The stable power supply can ensure the normal operation of FM350 module; and the ripple of the power
supply should be less than 300mV in design. Module supports 5G NR Sub-6 download, when module
operates with the maximum data transfer throughput, the peak current can reach to upper 3500mA. It
requests the power source voltage should not be lower than 3.135V, otherwise module may shut down or
restart. The power supply requirement is shown in Figure 3-3:
Burst transmit Burst transmit
min:3.135V
Power supply Ripple≤300mV
Drop
VBAT≥3.135V
Figure 3-3 Power supply requirement
Logic level
The FM350 module 1.8V logic level definition as shown in the following table:
Parameters
Minimum
Typical
Maximum
Unit
1.8V logic level
1.71
1.8
1.89
V
VIH
1.3
1.8
1.89
V
VIL
-0.3
0
0.3
V
The FM350 module 3.3V logic level definition as shown in the following table:

Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
FM350-GL Hardware Guide Page 20 of 59
Parameters
Minimum
Typical
Maximum
Unit
3.3V logic level
3.135
3.3
3.465
V
VIH
2.3
3.3
3.465
V
VIL
-0.3
0
0.3
V
3.3 Control Signal
The FM350 module provides two control signals for power on/off and reset operations, the pin defined as
shown in the following table:
Pin
Pin Name
I/O
Reset Value
Functions
Level
6
FULL_CARD_POWER
_OFF#
I
PU
Module power on/off input,
internal pull up(350KΩ)
Power on: High/Floating
Power off: Low
3.3/1.8V
67
RESET#
I
PU
WWAN reset input, active low,
internal pull up(350KΩ)
1.8V
50
PERST#
I
PU
Asserted to reset module PCIe
interface default. If module went into
core dump, it will reset whole
module, not only PCIe interface.
Active low, internal pull up(10KΩ)
3.3/1.8V
Note：
RESET# and PERST# need to be controlled by independent GPIO, and not shared with other
devices on the host.
Module Start-Up
3.3.1.1 Start-up Circuit
The FCPO#( FULL_CARD_POWER_OFF #) pin needs an external 3.3V or 1.8V pull up for booting up.
AP (Application Processor) controls the module start-up. The recommended design is using a default PD
port to control FCPO#. It also should reserve a 100K pull down resistor on AP side. The circuit design is
shown in Figure 3-4: