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 71 of 143
A power management IC should meet the following prerequisites to comply with the module’s VCC
requirements as summarized in Table 7:
High efficiency internal step down converter, compliant with features specified in section 2.2.1.2
Low internal resistance in the active path Vout – Vbat, typically lower than 50 m
High efficiency switch mode charger with separate power path control
GND
Power path management IC
VoutVin
θ
Li-Ion/Li-Pol
Bat t ery Pack
GND
Syst em
12 V
Primary
Source
Charge
controller
DC/DC
convert er and
bat t ery FET
control logic
Vbat
Figure 26: Charger / regulator with integrated power path management circuit block diagram
Figure 27 / Table 22 provide an application circuit example where the MPS MP2617H switching charger
and regulator with integrated power path management provides the supply to the cellular module. At the
same time it also concurrently and autonomously charges a suitable Li-Ion (or Li-Polymer) battery with the
correct pulse and DC discharge current capabilities and the appropriate DC series resistance according to
the rechargeable battery recommendations described in section 2.2.1.4.
The MP2617H IC constantly monitors the battery voltage and selects whether to use the external main
primary supply / charging source or the battery as the supply source for the module, and starts a charging
phase accordingly.
The MP2617H IC normally provides a supply voltage to the module regulated from the external main
primary source allowing immediate system operation even under missing or deeply discharged battery: the
integrated switching step-down regulator is capable to provide up to 3 A output current with low output
ripple and fixed 1.6 MHz switching frequency in PWM mode operation. The module load is satisfied in
priority, then the integrated switching charger will take the remaining current to charge the battery.
Additionally, the power path control allows an internal connection from the battery to the module with a
low series internal ON resistance (40 m typical), in order to supplement additional power to the module
when the current demand increases over the external main primary source or when this external source is
removed.
Battery charging is managed in three phases: