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 System description Page 40 of 129
C1-Public
the SARA-R4 series module acts as an I2C host which can communicate with I2C devices in
accordance with the I2C bus specifications [10].
The SDA and SCL pins have internal pull-up to V_INT, so there is no need of additional pull-up resistors
on the external application board.
1.10 Audio
☞ Audio is not supported by current product versions: I2S pins should not be driven from external.
SARA-R422S and SARA-R422M8S modules are designed to support Voice over LTE Cat M1 radio
bearer (VoLTE) and Circuit-Switched Fall-Back over 2G radio bearer (CSFB) audio services. The
modules accordingly include an I2S digital audio interface (I2S_WA, I2S_RXD, I2S_CLK, and I2S_TXD)
to transfer digital audio data to/from an external compatible audio device.
1.11 General Purpose Input/Output
SARA-R4 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-R4 series AT
commands manual [2], +UGPIOC, +UGPIOR, +UGPIOW AT commands), as summarized in Table 9.
Function
Description
Default GPIO
Configurable GPIOs
Network status
indication
Network status: registered / data transmission, no service
--
GPIO1
GNSS supply enable
31
Enable/disable the supply of a u-blox GNSS receiver
connected to the cellular module by the I2C
--
GPIO2
GNSS data ready
31
Sense when a u-blox GNSS receiver connected to the
module is ready for sending data by the I2C
--
GPIO3
SIM card detection
SIM card physical presence detection
--
GPIO5
Ring Indicator
32
Events indicator
--
RI
Module status indication
Module switched off or in PSM low power deep sleep mode,
versus active or connected mode
--
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
Last gasp
32
Input to trigger last gasp notification
--
GPIO3, GPIO4, GPIO6
33
Faster and safe
power-off
34
Input to trigger emergency faster and safe shutdown of the
module (as triggered by AT+CFUN=10)
--
GPIO3, GPIO4
LwM2M pulse
35
Output to notify a settable LwM2M event with a
configurable pulse
--
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, GPIO6
General purpose input
Input to sense high or low digital level
--
GPIO1, GPIO2, GPIO3,
GPIO4, GPIO5, 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
All
All
Table 9: SARA-R4 series modules GPIO custom functions configuration
31
Not supported by SARA-R410M-01B, SARA-R422, and SARA-R422M8S product versions
32
Not supported by SARA-R410M-01B, SARA-R410M-02B-00 and SARA-R422 product versions
33
Not supported by SARA-R422S and SARA-R422M8S product versions
34
Not supported by SARA-R410M and SARA-R412M product versions
35
Not supported by SARA-R410M-01B, SARA-R410M-52B product versions and SARA-R410M-02B-00, SARA-R410M-02B-01,
SARA-R410M-02B-02, SARA-R412M-02B-00, SARA-R412M-02B-01, SARA-R412M-02B-02