Integration Manual
Table Of Contents
- Preface
- 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 or 3.3Vaux)
- 1.5.1.1 VCC or 3.3Vaux supply requirements
- 1.5.1.2 VCC or 3.3Vaux current consumption in 2G connected-mode
- 1.5.1.3 VCC or 3.3Vaux current consumption in 3G connected mode
- 1.5.1.4 VCC or 3.3Vaux current consumption in LTE connected-mode
- 1.5.1.5 VCC or 3.3Vaux current consumption in cyclic idle/active mode (power saving enabled)
- 1.5.1.6 VCC or 3.3Vaux current consumption in fixed active-mode (power saving disabled)
- 1.5.2 RTC supply input/output (V_BCKP)
- 1.5.3 Generic digital interfaces supply output (V_INT)
- 1.5.1 Module supply input (VCC or 3.3Vaux)
- 1.6 System function interfaces
- 1.7 Antenna interface
- 1.8 SIM interface
- 1.9 Data communication interfaces
- 1.10 Audio
- 1.11 General Purpose Input/Output
- 1.12 Mini PCIe specific signals (W_DISABLE#, LED_WWAN#)
- 1.13 Reserved pins (RSVD)
- 1.14 Not connected pins (NC)
- 1.15 System features
- 1.15.1 Network indication
- 1.15.2 Antenna supervisor
- 1.15.3 Jamming detection
- 1.15.4 IP modes of operation
- 1.15.5 Dual stack IPv4/IPv6
- 1.15.6 TCP/IP and UDP/IP
- 1.15.7 FTP
- 1.15.8 HTTP
- 1.15.9 SSL / TLS
- 1.15.10 Bearer Independent Protocol
- 1.15.11 Wi-Fi integration
- 1.15.12 Firmware update Over AT (FOAT)
- 1.15.13 Firmware update Over The Air (FOTA)
- 1.15.14 Smart temperature management
- 1.15.15 SIM Access Profile (SAP)
- 1.15.16 Power saving
- 2 Design-in
- 2.1 Overview
- 2.2 Supply interfaces
- 2.2.1 Module supply (VCC or 3.3Vaux)
- 2.2.1.1 General guidelines for VCC or 3.3Vaux supply circuit selection and design
- 2.2.1.2 Guidelines for VCC or 3.3Vaux supply circuit design using a switching regulator
- 2.2.1.3 Guidelines for VCC or 3.3Vaux supply circuit design using a Low Drop-Out linear regulator
- 2.2.1.4 Guidelines for VCC supply circuit design using a rechargeable Li-Ion or Li-Pol battery
- 2.2.1.5 Guidelines for VCC supply circuit design using a primary (disposable) battery
- 2.2.1.6 Additional guidelines for VCC or 3.3Vaux supply circuit design
- 2.2.1.7 Guidelines for external battery charging circuit
- 2.2.1.8 Guidelines for external battery charging and power path management circuit
- 2.2.1.9 Guidelines for VCC or 3.3Vaux supply layout design
- 2.2.1.10 Guidelines for grounding layout design
- 2.2.2 RTC supply output (V_BCKP)
- 2.2.3 Generic digital interfaces supply output (V_INT)
- 2.2.1 Module supply (VCC or 3.3Vaux)
- 2.3 System functions interfaces
- 2.4 Antenna interface
- 2.5 SIM interface
- 2.6 Data communication interfaces
- 2.7 Audio interface
- 2.8 General Purpose Input/Output
- 2.9 Mini PCIe specific signals (W_DISABLE#, LED_WWAN#)
- 2.10 Reserved pins (RSVD)
- 2.11 Module placement
- 2.12 TOBY-L2 series module footprint and paste mask
- 2.13 MPCI-L2 series module installation
- 2.14 Thermal guidelines
- 2.15 ESD guidelines
- 2.16 Schematic for TOBY-L2 and MPCI-L2 series module integration
- 2.17 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 and Economic Development Canada notice
- 4.4 Brazilian Anatel certification
- 4.5 European Conformance CE mark
- 4.6 Australian Regulatory Compliance Mark
- 4.7 Taiwanese NCC certification
- 4.8 Japanese Giteki certification
- 5 Product testing
- Appendix
- A Migration between TOBY-L1 and TOBY-L2
- B Glossary
- Related documents
- Revision history
- Contact
TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R26 Design-in
Page 115 of 162
2.7 Audio interface
2.7.1 Digital audio interface
The I
2
S interface is not available on MPCI-L2 series modules.
2.7.1.1 Guidelines for digital audio circuit design
The I
2
S interface is not supported by TOBY-L2 series modules “00”, “01”, “60”, TOBY-L201-02S and
TOBY-L220-62S product versions: the pins should not be driven by any external device.
I
2
S digital audio interface can be connected to an external digital audio device for voice applications.
Any external digital audio device compliant with the configuration of the digital audio interface of the TOBY-L2
cellular module can be used, given that the external digital audio device must provide:
The slave role: opposite role of TOBY-L2 modules, which act as master only
The same mode and frame format: PCM / short synch mode or Normal I
2
S / long synch mode with
o data in 2’s complement notation
o MSB transmitted first
o data word length = 16-bit (16 clock cycles)
o frame length = synch signal period = 32-bit (32 clock cycles)
The same sample rate, i.e. synch signal frequency, configurable by AT+UI2S <I2S_sample_rate> parameter
o 8 kHz
o 16 kHz
The same serial clock frequency:
o 32 x <I2S_sample_rate>
Compatible voltage levels (1.80 V typ.), otherwise it is recommended to connect the 1.8 V digital audio
interface of the module to the external 3.0 V (or similar) digital audio device by means of appropriate
unidirectional voltage translators (e.g. TI SN74AVC4T774 or SN74AVC2T245, providing partial power down
feature so that the digital audio device 3.0 V supply can be also ramped up before V_INT 1.8 V supply), using
the module V_INT output as 1.8 V supply for the voltage translators on the module side
Support of the side-tone, which is not available in the internal audio processing system of TOBY-L2 modules
as summarized in Figure 26. The side-tone is a part of the user's speech on uplink path that should be listened
on downlink path by the user himself to have perception the call is on.
For the appropriate selection of a compliant external digital audio device, see section 1.10.1 and see the +UI2S AT
command description in the u-blox AT Commands Manual [3] for further details regarding the capabilities and the
possible settings of I
2
S digital audio interface of TOBY-L2 modules.
An appropriate specific application circuit has to be implemented and configured according to the particular
external digital audio device or audio codec used and according to the application requirements.
Examples of manufacturers offering compatible audio codec parts are the following:
Maxim Integrated (as the MAX9860, MAX9867, MAX9880A audio codecs)
Texas Instruments / National Semiconductor
Cirrus Logic / Wolfson Microelectronics
Nuvoton Technology
Asahi Kasei Microdevices
Realtek Semiconductor