Integration Manual
Table Of Contents
- Contents
- 1 System description
- 1.1 Overview
- 1.2 Architecture
- 1.3 Pin-out
- 1.4 Operating modes
- 1.5 Supply interfaces
- 1.5.1 Module supply input (VCC)
- 1.5.1.1 VCC supply requirements
- 1.5.1.2 VCC current consumption in 2G connected mode
- 1.5.1.3 VCC current consumption in 3G connected mode
- 1.5.1.4 VCC current consumption in LTE connected mode
- 1.5.1.5 VCC current consumption in cyclic low power idle mode / active mode
- 1.5.1.6 VCC current consumption in fixed active mode
- 1.5.2 Generic digital interfaces supply output (V_INT)
- 1.5.1 Module supply input (VCC)
- 1.6 System function interfaces
- 1.7 Antenna interfaces
- 1.8 SIM interfaces
- 1.9 Data communication interfaces
- 1.10 eMMC interface
- 1.11 Digital Audio interfaces
- 1.12 ADC interfaces
- 1.13 General Purpose Input/Output
- 1.14 Reserved pins (RSVD)
- 1.15 System features
- 1.15.1 Network indication
- 1.15.2 Jamming detection
- 1.15.3 IP modes of operation
- 1.15.4 Dual stack IPv4 and IPv6
- 1.15.5 Embedded TCP/IP and UDP/IP
- 1.15.6 Embedded FTP and FTPS
- 1.15.7 Embedded HTTP and HTTPS
- 1.15.8 SSL and TLS
- 1.15.9 Firmware update Over AT (FOAT)
- 1.15.10 Firmware update Over The Air (FOTA)
- 1.15.11 Power Saving
- 2 Design-in
- 2.1 Overview
- 2.2 Supply interfaces
- 2.2.1 Module supply (VCC)
- 2.2.1.1 General guidelines for VCC supply circuit selection and design
- 2.2.1.2 Guidelines for VCC supply circuit design using a switching regulator
- 2.2.1.3 Guidelines for VCC supply circuit design using a LDO linear regulator
- 2.2.1.4 Guidelines for VCC supply circuit design using a rechargeable battery
- 2.2.1.5 Guidelines for VCC supply circuit design using a primary battery
- 2.2.1.6 Additional guidelines for VCC supply circuit design
- 2.2.1.7 Guidelines for the external battery charging circuit
- 2.2.1.8 Guidelines for external charging and power path management circuit
- 2.2.1.9 Guidelines for removing VCC supply
- 2.2.1.10 Guidelines for VCC supply layout design
- 2.2.1.11 Guidelines for grounding layout design
- 2.2.2 Generic digital interfaces supply output (V_INT)
- 2.2.1 Module supply (VCC)
- 2.3 System functions interfaces
- 2.4 Antenna interface
- 2.5 SIM interfaces
- 2.6 Data communication interfaces
- 2.7 eMMC interface
- 2.8 Digital Audio interface
- 2.9 ADC interfaces
- 2.10 General Purpose Input/Output
- 2.11 Reserved pins (RSVD)
- 2.12 Module placement
- 2.13 Module footprint and paste mask
- 2.14 Thermal guidelines
- 2.15 Design-in checklist
- 3 Handling and soldering
- 4 Approvals
- 5 Product testing
- 6 FCC Notes
- Appendix
- Glossary
- Related documents
- Revision history
- Contact
TOBY-L3 series - System Integration Manual
TSD-19090601 - R13 System Integration Manual Page 39 of 143
1.7 Antenna interfaces
1.7.1 Antenna RF interfaces (ANT1 / ANT2)
TOBY-L3 series modules provide two RF interfaces for connecting the external antennas for 4G/3G/2G
network:
ANT1 represents the primary RF input/output for transmission and reception of RF signals.
ANT1 pin has a nominal characteristic impedance of 50 and must be connected to the primary Tx /
Rx antenna through a 50 transmission line to allow clean RF transmission and reception.
ANT2 represents the secondary RF input for reception of RF signals in MIMO and Rx diversity
configurations supported by TOBY-L3 series modules as a required feature for LTE category 4 UEs.
ANT2 pin has a nominal characteristic impedance of 50 and must be connected to the secondary Rx
antenna through a 50 transmission line to allow clean RF reception.
1.7.1.1 Antenna RF interfaces (ANT1 / ANT2) requirements
Table 8, Table 9 and Table 10 summarize the RF interfaces’ requirements. See section 2.4.1 for suggestions
on how to correctly design antennas circuits compliant with these requirements.
⚠ The antenna circuits affect the RF compliance of the device integrating TOBY-L3 series modules with
the applicable required certification schemes (see section 4). Compliance is guaranteed if the antenna
RF interfaces requirements summarized in Table 8, Table 9 and Table 10 are fulfilled.
Item
Requirements
Remarks
Impedance
50 nominal characteristic
impedance
The impedance of the antenna RF connection must match the 50
impedance of the ANT1 port.
Frequency Range
See the TOBY-L3 series Data
Sheet [1]
The required frequency range of the antenna connected to the ANT1
port depends on the operating bands of the used cellular module and
the used mobile network.
Return Loss
S
11
< -10 dB (VSWR < 2:1)
recommended
S
11
< -6 dB (VSWR < 3:1) acceptable
The Return loss or the S
11
, as the VSWR, refers to the amount of reflected
power, measuring how well the antenna RF connection matches the 50
characteristic impedance of the ANT1 port.
The impedance of the antenna termination must match as much as
possible the 50 nominal impedance of the ANT1 port over the
operating frequency range, reducing as much as possible the amount of
reflected power.
Efficiency
> -1.5 dB ( > 70% ) recommended
> -3.0 dB ( > 50% ) acceptable
The radiation efficiency is the ratio of the radiated power to the power
delivered to antenna input: the efficiency is a measure of how well an
antenna receives or transmits.
The radiation efficiency of the antenna connected to the ANT1 port
needs to be enough high over the operating frequency range to comply
with the Over-The-Air radiated performance requirements, as Total