TOBY-L4 series - System Integration Manual
UBX-16024839 - R04
System description
Page 45 of 143
1.9.4
DDC (I
2
C) interfaces
DDC (I
2
C) interfaces are not supported by the "50" product version.
1.9.4.1
I2C0 interface
The
SDA
and
SCL
pins represent the I2C0 1.8 V I
2
C bus compatible Display Data Channel (DDC) interface, with
the module acting as I
2
C master, available for
communication with u-blox GNSS chips / modules
communication with other external I
2
C devices by means of the uCPU API
The I2C0 interface pins of the module are open drain outputs conforming to the
I
2
C bus specifications
supporting up to 100 kbit/s data rate in Standard mode, and up to 400 kbit/s data rate in Fast mode. External
pull-up resistors to suitable 1.8 V supply (e.g.
V_INT
) are required for operations.
u-blox has implemented special features to ease the design effort required for the integration of a u-blox cellular
module with a u-blox GNSS receiver.
Combining a u-blox cellular module with a u-blox GNSS receiver allows designers to have full access to the
positioning receiver directly via the cellular module: it relays control messages to the GNSS receiver via a
dedicated DDC (I
2
C) interface. An interface connected to the positioning receiver is not necessary: the cellular
module allows full control of the GNSS receiver.
The modules provide embedded GNSS aiding that is a set of specific features developed by u-blox to improve the
cellular / GNSS system power consumption and the GNSS performance, decreasing the Time-To-First-Fix (TTFF),
thus allowing to calculate the position in a shorter time with higher accuracy.
1.9.4.2
I2C1 interface
The
SDA
and
SCL
pins represent the I2C1 I
2
C bus compatible Display Data Channel (DDC) interface, with the
module acting as the I
2
C master, available for
communication with other external I
2
C devices by means of uCPU API
The I2C1 interface pins of the module are open drain outputs conforming to the
I
2
C bus specifications
supporting up to 100 kbit/s data rate in Standard mode, and up to 400 kbit/s data rate in Fast mode. External
pull-up resistors to a suitable 1.8 V supply (e.g.
V_INT
) are required for operations.
1.9.5
SDIO interface
SDIO interface is not supported by the "50" product version.
TOBY-L4 series modules include a 4-bit Secure Digital Input Output interface (
SDIO_D0
,
SDIO_D1
,
SDIO_D2
,
SDIO_D3
,
SDIO_CLK
,
SDIO_CMD
), where the module acts as an SDIO host controller designed to
communicate with compatible u-blox short range radio communication modules by means of the uCPU API
communicate with external SDIO devices by means of the uCPU API
The SDIO interface supports up to 832 Mbit/s data rate with SD 3.0 SDR104 mode at 208 MHz clock frequency.
Combining a u-blox cellular module with a u-blox short range communication module gives designers full access
to the Wi-Fi module directly via the cellular module, so that a second interface connected to the Wi-Fi module is
not necessary. The cellular module allows a full control of the Wi-Fi module, because Wi-Fi control messages are
relayed to the Wi-Fi module via the dedicated SDIO interface.
u-blox has implemented special features in the cellular modules to ease the design effort for the integration of a
u-blox cellular module with a u-blox short range Wi-Fi module to provide Router functionality.
