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 73 of 143
D1, D2
Low Capacitance ESD Protection
CG0402MLE-18G - Bourns
D3
Schottky Diode 40 V 3 A
MBRA340T3G - ON Semiconductor
R1, R3, R5, R7
10 k Resistor 0402 1% 1/16 W
Generic manufacturer
R2
1.05 k Resistor 0402 1% 0.1 W
Generic manufacturer
R4
22 k Resistor 0402 1% 1/16 W
Generic manufacturer
R6
26.5 k Resistor 0402 1% 1/16 W
Generic manufacturer
L1
2.2 µH Inductor 7.4 A 13 m 20%
SRN8040-2R2Y - Bourns
U1
Li-Ion/Li-Polymer Battery DC/DC Charger / Regulator with
integrated Power Path Management function
MP2617H - Monolithic Power Systems (MPS)
Table 22: Suggested components for a Li-Ion (or Li-Pol) battery charging and power path management application circuit
2.2.1.9 Guidelines for removing VCC supply
As described in section 1.6.2, in particular in Figure 14 and Figure 15, the VCC supply can be removed after
the end of TOBY-L3 series module’s internal power-off sequence, which must be properly started as
described in section 1.6.2.
Removing VCC power can be useful in order to minimize the power consumption when TOBY-L3 series
modules are switched off. Then, the modules can be switched on again by re-applying VCC supply.
If the VCC supply is generated by a switching or an LDO regulator, the application processor may control
the input pin of the regulator which is provided to enable / disable the output of the regulator (as for
example, the RUN input pin for the regulator illustrated in Figure 22, or the SHDNn input pin for the
regulator illustrated in Figure 23), in order to apply / remove the VCC supply.
If the regulator that generates the VCC supply does not provide an on / off pin, or for other applications
such as the battery-powered ones, the VCC supply can be switched off using an appropriate external p-
channel MOSFET controlled by the application processor by means of a suitable inverting transistor as
shown in Figure 28, given that the external p-channel MOSFET has provided:
Very low R
DS(ON)
(for example, less than 50 m), to minimize voltage drops
Adequate maximum Drain current (see TOBY-L3 series Data Sheet [1] for consumption figures)
Low leakage current, to minimize the current consumption
C3
GND
C2C1 C4
TOBY-L3 series
71
VCC
72
VCC
70
VCC
+
VCC Supply Source
GND
GPIO
C5
R1
R3
R2
T2
T1
Application
Processor
Figure 28: Example of application circuit for VCC supply removal