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 34 of 123
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1.9.1.2 UART signals behavior
At the end of the module boot sequence (see Figure 11, Figure 12, Figure 13), the module is by default
in active mode, and the UART interface is initialized and enabled as AT commands interface.
The configuration and behavior of the UART signals after the boot sequence are described below:
The module data output lines (RXD only if USIO variant 0 or 1 is set; RXD and DCD if USIO variant
2, 3 or 4 is set) are set by default to the OFF state (high level) at UART initialization. The module
holds these lines in the OFF state until the module transmits some data.
The module data input lines (TXD only if USIO variant 0 or 1 is set; TXD and DTR if USIO variant 2,
3 or 4 is set) are assumed to be controlled by the external host once UART is initialized. The data
input lines have an internal active pull-up enabled.
1.9.1.3 UART multiplexer protocol
SARA-R5 series modules include multiplexer functionality as per 3GPP TS 27.010 [8], on the UART
physical link. This is a data link protocol which uses HDLC-like framing and operates between the
module (DCE) and the application processor (DTE) and allows a number of simultaneous sessions over
the used physical link (UART).
When USIO variant 0 or 1 is set, the following virtual channels are defined:
Channel 0: control channel
Channel 1 – 3: AT commands / data communication
Channel 4: GNSS tunneling
When USIO variant 2 is set, AT commands and data communication are available on second auxiliary
UART, and the following virtual channels are defined on main primary UART:
Channel 0: control channel
Channel 1 – 2: AT commands / data communication
Channel 3: GNSS tunneling
When USIO variant 3 is set, diagnostic trace log is available on second auxiliary UART, and the
following virtual channels are defined on main primary UART:
Channel 0: control channel
Channel 1 – 3: AT commands / data communication
Channel 4: GNSS tunneling
When USIO variant 4 is set, GNSS tunneling is available on second auxiliary UART, and the following
virtual channels are defined on main primary UART:
Channel 0: control channel
Channel 1 – 3: AT commands / data communication
1.9.2 USB interface
SARA-R5 series modules include a high-speed USB 2.0 compliant interface with a maximum
480 Mbit/s data rate according to the Universal Serial Bus Revision 2.0 specification [4]. The module
itself acts as a USB device and can be connected to any USB host equipped with compatible drivers.
The USB interface is available for diagnostic purpose only.
The USB_D+ / USB_D- lines carry the USB data / signaling, while the VUSB_DET input pin represents
the input to enable the USB interface by applying an external valid USB VBUS voltage (5 V typical).