TOBY-R2 series - System integration manual
UBX-16010572 - R10
System description
Page 51 of 151
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“GNSS Tx data ready” and “GNSS RTC sharing” functions are not supported by all u-blox GNSS
receivers HW or ROM/FW versions. Please see the GNSS implementation application note
to the Hardware Integration Manual of the u-blox GNSS receivers for the supported features.
As additional improvement for the GNSS receiver performance, the V_BCKP supply output of the
cellular modules can be connected to the V_BCKP supply input pin of u-blox positioning chips and
modules to provide the supply for the GNSS real time clock and backup RAM when the VCC supply of
the cellular module is within its operating range and the VCC supply of the GNSS receiver is disabled.
This enables the u-blox positioning receiver to recover from a power breakdown with either a hot start
or a warm start (depending on the duration of the GNSS receiver VCC outage) and to maintain the
configuration settings saved in the backup RAM.
1.9.4
SDIO interface
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Secure Digital Input Output interface is not supported by TOBY-R2 series modules “02” / "42" / "82"
product versions.
TOBY-R2 series modules include a 4-bit Secure Digital Input Output interface (SDIO_D0, SDIO_D1,
SDIO_D2, SDIO_D3, SDIO_CLK, SDIO_CMD) designed to communicate with an external u-blox short
range Wi-Fi module: the cellular module acts as an SDIO host controller which can communicate over
the SDIO bus with a compatible u-blox short range radio communication Wi-Fi module acting as SDIO
device.
The SDIO interface is the only one interface of TOBY-R2 series modules dedicated for communication
between the u-blox cellular module and the u-blox short range Wi-Fi module.
The AT commands interface is not available on the SDIO interface of TOBY-R2 series modules.
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. AT commands via the AT interfaces of the cellular module allows
a full control of the Wi-Fi module from any host processor, 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.
Additional custom function over GPIO pins is designed to improve the integration with u-blox Wi-Fi
modules:
Wi-Fi enable
Switch-on / switch-off the Wi-Fi
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Wi-Fi enable function over GPIO is not supported by TOBY-R2 series modules “02” / "42" / "82"
product versions.
