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 System description Page 36 of 123
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1.11 General purpose input / output (GPIO)
SARA-R5 series modules include pins which can be configured as General Purpose Input/Output or to
provide custom functions via u-blox AT commands (for more details see the SARA-R5 series AT
commands manual [2], +UGPIOC, +UGPIOR, +UGPIOW AT commands), as summarized in Table 8.
Function
Description
Default GPIO
Configurable GPIOs
Network status
indication
Output indicating cellular network status: registered, data
transmission, no service
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
External GNSS supply
enable
5
Output to enable/disable the supply of an external u-blox
GNSS receiver connected to the cellular module by I2C
-
GPIO2
5
External GNSS data
ready
5
Input to sense when an external u-blox GNSS receiver
connected to the module is ready for sending data over I2C
-
GPIO3
5
External GNSS RTC
sharing
5
Output providing RTC synchronization signal to an external
u-blox GNSS receiver connected to cellular module by I2C
-
GPIO4
5
SIM card detection
Input for SIM card physical presence detection, to optionally
enable / disable SIM interface upon detection of external SIM
card physical insertion / removal
GPIO5
GPIO5
Module status
indication
Output indicating module status: power-off or deep-sleep
mode versus idle, active or connected mode
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Module operating
mode indication
Output indicating module operating mode: power-off,
deep-sleep or idle mode versus active or connected mode
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Ring indicator
Output providing events indicator
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
DTR
Input to control low power idle mode of the module in case of
+UPSV: 3 and +USIO: 2/3/4 configuration
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Antenna dynamic
tuning
Output for real time control of an antenna tuning IC
according to the LTE band used by the module
-
I2S_TXD, I2S_WA
Last gasp
Input to trigger last gasp notification
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Fast shutdown
Input to trigger emergency fast shutdown of the module
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Time stamp output
5
Output indicating the generation of an URC time stamp
triggered via interrupt from an external GNSS system
GPIO4
Time pulse output
Output providing accurate time reference, as a sequence
with 1 PPS or as single time pulse, based on the GNSS
system, the LTE system, or CellLocate
-
GPIO6
External time stamp
input
Input triggering via interrupt the generation of an URC time
stamp over AT serial interface
-
EXT_INT
External time pulse
input
5
Input to receive an accurate time reference, as a sequence
with 1 PPS from an external GNSS system
SDIO_CMD
General purpose input
Input to sense high or low digital level
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
General purpose
output
Output to set the high or the low digital level
-
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6
Pin disabled
Tri-state with an internal active pull-down enabled
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6,
I2S_TXD, I2S_WA,
EXT_INT, SDIO_CMD
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO6,
I2S_TXD, I2S_WA,
EXT_INT, SDIO_CMD
Table 8: SARA-R5 series modules GPIO custom functions configuration
1.12 Reserved pin (RSVD)
SARA-R5 series modules have a pin reserved for future use, marked as RSVD. This pin is to be left
unconnected on the application board.
5
SARA-R500S and SARA-R510S modules only.