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 consumption in deep-sleep mode (low power mode and PSM enabled)
- 1.5.1.4 VCC current consumption in low power idle mode (low power mode enabled)
- 1.5.1.5 VCC current consumption in active mode (low power mode and PSM 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 (GPIO)
- 1.12 Reserved pin (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 low drop-out 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 removing VCC supply
- 2.2.1.9 Additional guidelines for VCC supply circuit design
- 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 interfaces
- 2.5 SIM interface
- 2.6 Data communication interfaces
- 2.6.1 UART interfaces
- 2.6.1.1 Guidelines for UART circuit design
- Providing 1 UART with the full RS-232 functionality (using the complete V.24 link)
- Providing 1 UART with the TXD, RXD, RTS, CTS, DTR and RI lines only
- Providing 1 UART with the TXD, RXD, RTS and CTS lines only
- Providing 2 UARTs with the TXD, RXD, RTS and CTS lines only
- Providing 1 UART with the TXD and RXD lines only
- Providing 2 UARTs with the TXD and RXD lines only
- Additional considerations
- 2.6.1.2 Guidelines for UART layout design
- 2.6.1.1 Guidelines for UART circuit design
- 2.6.2 USB interface
- 2.6.3 SPI interfaces
- 2.6.4 SDIO interface
- 2.6.5 DDC (I2C) interface
- 2.6.1 UART interfaces
- 2.7 Audio
- 2.8 General purpose input / output (GPIO)
- 2.9 Reserved pin (RSVD)
- 2.10 Module placement
- 2.11 Module footprint and paste mask
- 2.12 Schematic for SARA-R5 series module integration
- 2.13 Design-in checklist
- 3 Handling and soldering
- 4 Approvals
- 5 Product testing
- Appendix
- A Migration between SARA modules
- B Glossary
- Related documents
- Revision history
- Contact
SARA-R5 series - System integration manual
UBX-19041356 - R03 Design-in Page 64 of 123
Confidential
2.4.3.2 Guidelines for applications with an active antenna
Active antennas for GNSS applications are usually powered through a DC bias on the RF cable. A
simple bias-T, as shown in Figure 42, can be used to add this DC current to the RF signal line. The
inductance L is responsible for isolating the RF path from the DC path, while Rbias and C form a low
pass filter to remove high frequency noise from the DC supply. L should be also selected to pass the
DC fault current in case the antenna connection is shorted.
SARA-R510M8S
31
ANT_GNSS
GND
LNA
Active antenna
Coaxial antenna
cable
VCC_ANT
Rbias
10 ohm
C
L
Figure 42: Typical circuit with active antenna connected to GNSS RF interface of SARA-R510M8S, using an external supply.
☞ Refer to the antenna datasheet and/or manufacturer for proper values of the inductance L and
capacitance C.
Table 22 lists examples of active antennas to be used with SARA-R510M8S modules.
Manufacturer
Part number
Product name
Description
Tallysman
TW3400
Active antenna, 2.5 - 16 V
GPS / SBAS / QZSS / GLONASS
Tallysman
TW3710
Active antenna, 2.5 – 16 V
GPS / SBAS / QZSS / GLONASS / Galileo / BeiDou
Taoglas
AA.162.301111
Ulysses
Ultra-Low profile miniature antenna, 1.8 – 5.5V
GPS / SBAS / QZSS / GLONASS / Galileo
Taoglas
MA310.A.LB.001
Magnet mount antenna, 1.8 – 5.5 V
GPS / SBAS / QZSS / GLONASS
Inpaq
B3G02G-S3-01-A
SMA plug active antenna, 3.3 V typical
GPS / SBAS / GLONASS
Inpaq
GPSH237N-N3-37-A
Patch circular antenna, 3.0 V typical
GPS / SBAS / QZSS
Abracon LLC
APAMP-110
Module RF antenna 5dBic SMA adhesive, 2.5 – 3.5 V
GPS / SBAS / QZSS
TE Connectivity
2195768-1
Active antenna, 3.0 V typical
GPS / SBAS / QZSS
Table 22: Examples of GNSS active antennas.