Integration Manual
Table Of Contents
- Document information
- 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 LTE connected mode
- 1.5.1.3 VCC current consumption in 2G connected mode
- 1.5.1.4 VCC current consumption in ultra low power deep sleep mode
- 1.5.1.5 VCC current consumption in low power idle mode
- 1.5.1.6 VCC current consumption in active mode (PSM / low power disabled)
- 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 interface
- 1.9 Data communication interfaces
- 1.10 Audio
- 1.11 General Purpose Input/Output
- 1.12 GNSS peripheral input output
- 1.13 Reserved pins (RSVD)
- 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 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 Guidelines for external battery charging circuit
- 2.2.1.7 Guidelines for external charging and power path management circuit
- 2.2.1.8 Guidelines for particular VCC supply circuit design for SARA-R4x2
- 2.2.1.9 Guidelines for removing VCC supply
- 2.2.1.10 Additional guidelines for VCC supply circuit design
- 2.2.1.11 Guidelines for VCC supply layout design
- 2.2.1.12 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 interfaces
- 2.5 SIM interface
- 2.6 Data communication interfaces
- 2.7 Audio
- 2.8 General Purpose Input/Output
- 2.9 GNSS peripheral input output
- 2.10 Reserved pins (RSVD)
- 2.11 Module placement
- 2.12 Module footprint and paste mask
- 2.13 Thermal guidelines
- 2.14 Schematic for SARA-R4 series module integration
- 2.15 Design-in checklist
- 3 Handling and soldering
- 4 Approvals
- 4.1 Product certification approval overview
- 4.2 US Federal Communications Commission notice
- 4.3 Innovation, Science, Economic Development Canada notice
- 4.4 European Conformance CE mark
- 4.5 National Communication Commission Taiwan
- 4.6 ANATEL Brazil
- 4.7 Australian Conformance
- 4.8 GITEKI Japan
- 4.9 KC South Korea
- 5 Product testing
- Appendix
- A Migration between SARA modules
- B Glossary
- Related documentation
- Revision history
- Contact
SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 52 of 129
C1-Public
The Battery Charger IC, as linear charger, is more suitable for applications where the charging source
has a relatively low nominal voltage (~5 V), so that a switching charger is suggested for applications
where the charging source has a relatively high nominal voltage (e.g. ~12 V, see section 2.2.1.7 for the
specific design-in).
C5C3 C6
GND
SARA-R4 series
52
VCC
53
VCC
51
VCC
USB
Supply
θ
U1
PG
STAT2
STA1
VDD
C1
5V0
THERM
Vss
Vbat
Li-Ion/Li-Pol
Battery Pack
D1
B1
C2
Li-Ion/Li-Polymer
Battery Charger IC
D2
PROG
R1
C4
Figure 26: Li-Ion (or Li-Polymer) battery charging application circuit
Reference
Description
Part Number - Manufacturer
B1
Li-Ion (or Li-Polymer) battery pack with 470 NTC
Generic manufacturer
C1
1 µF Capacitor Ceramic X7R 16 V
Generic manufacturer
C2
100 µF Capacitor Tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
C3
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H150JA01 - Murata
C4
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H680JA01 - Murata
C5
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C6
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C104KA01 - Murata
D1, D2
Low Capacitance ESD Protection
CG0402MLE-18G - Bourns
R1
10 k Resistor 0.1 W
Generic manufacturer
U1
Single Cell Li-Ion (or Li-Polymer) Battery Charger IC
MCP73833 - Microchip
Table 16: Suggested components for the Li-Ion (or Li-Polymer) battery charging application circuit
☞ See the section 2.2.1.10, and in particular Figure 31 / Table 20, for the parts recommended to be
provided if the application device integrates an internal antenna.
2.2.1.7 Guidelines for external charging and power path management circuit
Application devices where both a permanent primary supply / charging source (e.g. ~12 V) and a
rechargeable back-up battery (e.g. 3.7 V Li-Pol) are available at the same time as a possible supply
source, should implement a suitable charger / regulator with integrated power path management
function to supply the module and the whole device while simultaneously and independently charging
the battery.
Figure 27 reports a simplified block diagram circuit showing the working principle of a charger /
regulator with integrated power path management function. This component allows the system to be
powered by a permanent primary supply source (e.g. ~12 V) using the integrated regulator, which
simultaneously and independently recharges the battery (e.g. 3.7 V Li-Pol) that represents the back-
up supply source of the system. The power path management feature permits the battery to
supplement the system current requirements when the primary supply source is not available or
cannot deliver the peak system currents.