Hardware implementation
Issue C
39
Micro SD socket
A MicroSD memory socket is provided on the PROTEUS module. The US15W SCH
contains three SDIO/MMC ports. SDIO Port 1 is connected to a 4-bit MicroSD card
socket. Port 2 is connected to a ZIF connector and port 0 is not used.
The SDIO/MMC controller supports MMC4.0 and SDIO1.1 specifications. MMC 4.0
transfer rates can be up to 48MHz. SDIO 1.1 supports transfer rates of up to 24MHz. The
US15W SDIO/MMC controller supports only flash cards using byte addressing limiting
the maximum memory density to 2GB; sector based addressing is not supported.
Module power supply
The PROTEUS module supports a wide input voltage range from +8.5V to +24V DC with
a nominal operating voltage of +12V. Over current and over voltage protection are
provided on these main input rails. in the COM Express implementation an additional +5V
standby rail is available with an input voltage range from 4.75V to 5.25V. Applications
requiring Real Time Clock (RTC) backup support have the option of fitting a lithium
battery or using a SuperCap. in standalone operation the power supply input is via a PCB
mounted connector and via the 220-pin COM Express connector in the COM Express
primary configuration.
Indicator LEDs
Indicator LEDs are provided on the module to indicate:
• PCIE express minicard slot 0 activity.
• PCIE express minicard slot 1 activity.
• Disk (FLASH and SATA) activity.
• Bluetooth activity.
• Micro SD card activity.
• Power states S0, S3 and S5.
• Additional dual state on board edge LED indicates sleep state (orange) and full
power (green).
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