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 105 of 143
Table 39: Components for connecting TOBY-L3 series modules to u-blox 1.8 V GNSS devices
Figure 52 illustrates an alternative application circuit solution in which the cellular module supplies a u-blox
1.8 V GNSS device. The V_INT 1.8 V regulated supply output of the cellular module can be used as supply
source for a u-blox 1.8 V GNSS device instead of using an external voltage regulator, as shown in Figure
51. The V_INT supply is able to support the maximum current consumption of these positioning devices.
The internal switching step-down regulator that generates the V_INT supply is set to 1.8 V (typical) when
the cellular module is switched on and it is disabled when the module is switched off.
The supply of the u-blox 1.8 V GNSS device can be switched off using an external p-channel MOS controlled
by the GPIO2 pin of the cellular modules by means of a suitable inverting transistor as shown in Figure 52,
implementing the “GNSS supply enable” function. If this feature is not required, the V_INT supply output
can be directly connected to the u-blox 1.8 V GNSS device, so that it will switch on when V_INT output is
enabled.
According to the V_INT supply output voltage ripple characteristic specified in the TOBY-L3 series Data
Sheet [1], additional filtering may be needed to properly supply an external LNA, depending on the
characteristics of the used LNA, adding a series ferrite bead and a bypass capacitor (e.g. the Murata
BLM15HD182SN1 ferrite bead and the Murata GRM1555C1H220J 22 pF capacitor) at the input of the
external LNA supply line.
u-blox GNSS
1.8 V device
TxD1
SDA2
SCL2
VCC
1V8
C1
R3
5
V_INT
R5
R4
TP
T2
T1
R1 R2
1V8 1V8
GNSS data ready
GNSS supply enabled
22
GPIO2
SDA
SCL
GPIO3
55
54
24
TOBY-L3 series
Figure 52: Application circuit for connecting TOBY-L3 series modules to u-blox 1.8 V GNSS devices using V_INT as supply
Reference
Description
Part Number - Manufacturer
R1, R2
4.7 k Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
R3
47 k Resistor 0402 5% 0.1 W
RC0402JR-0747KL - Yageo Phycomp
R4
10 k Resistor 0402 5% 0.1 W
RC0402JR-0710KL - Yageo Phycomp