User Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R08 Early Production Information System description
Page 55 of 158
1.9.4 Secure Digital Input Output interface (SDIO)
Secure Digital Input Output interface is not available on MPCI-L2 series modules.
Secure Digital Input Output interface is not supported by TOBY-L2 “00” and “01” product versions.
TOBY-L2 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 TOBY-L2 cellular module acts as an SDIO host controller which can communicate over the SDIO bus with a
compatible u-blox short range Wi-Fi module acting as SDIO device.
The SDIO interface is the only one interface of TOBY-L2 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-L2 series modules.
The SDIO interface supports 50 MHz bus clock frequency, which allows a data throughput of 200 Mb/s.
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 (UART, USB) 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 (for more details, see the Wi-Fi AT commands in the u-blox AT Commands Manual [3]).
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 both Bridge and Router functionality
(for more details, see the Wi-Fi / Cellular Integration Application Note [14]).
Additional custom functions over GPIO pins are designed to improve the integration with u-blox Wi-Fi modules:
 Wi-Fi enable Switch-on / switch-off the Wi-Fi
 Wi-Fi reset Reset the Wi-Fi
 Wi-Fi data ready Cellular module wake-up when the Wi-Fi is ready for sending data over SDIO
 Wi-Fi power saving Enable/disable the low power mode of the Wi-Fi
 32 kHz output Clock for the Wi-Fi
 26 MHz output Clock for the Wi-Fi
GPIOs are not supported by TOBY-L2 “00”, “01”, and “50” product versions, except for:
 Wireless Wide Area Network status indication configured on GPIO1 of “00”, “01” product
versions
 Wi-Fi enable function configured on the GPIO1 of “50“ product version
GPIOs are not available on MPCI-L2 series modules.
1.10 Audio
1.10.1 Digital audio over I
2
S interface
Digital audio over I
2
S interface is not available on MPCI-L2 series modules.
Digital audio over I
2
S interface is not supported by TOBY-L2 modules ”00”, “01”, “50” product versions.
TOBY-L2 series modules include a 4-wire I
2
S digital audio interface (I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA) that
can be configured by AT command to transfer digital audio data with an external device as an audio codec (for
more details see u-blox AT Commands Manual [3]).