SETTING UP AND CONFIGURING THE DEVICE
Conduit
®
Hardware Guide
25
Accessory Port (mCard) Interfaces
The accessory card interface on the Conduit base board has the following interface options:
Interface
Description
I2C
Used by all accessory cards. I2C is required for
Electronic Identification (EID) support on the accessory
card but can be used for other I2C devices. It should
supports standard (100 kHz) and/or fast (400 kHz) clock
speeds.
The I2C interface reserves the full block of EEPROM
address space for Electronic ID support, so we
recommend that you not attach any other EEPROM
devices to the interface. We recommend that you use a
24C04 part, because both address bits of the 24C04 are
connected to the AP interface allowing you to identify
four separate accessory port (AP) cards in a system.
Serial UART
Serial UART with HW flow control used by Serial
interface based Accessory Cards
SDIO interface and/or SPI Interface
AP1 has option for SDIO or SPI interface, based on what
Accessory Card is installed. AP2 supports only SPI based
Accessory Cards.
GPIO
Additional control pins for certain Accessory Cards.
Interrupts
Software defined interrupts. Can also be used as
additional control pins.
PPS
GPS generated Pulse-Per-Second signal used for
software timing. Default is 1 pulse/sec.
USB 2.0
A standard USB 2.0 High Speed interface for USB based
Accessory Cards.
5 VDC 1 Amp supply
Used by all accessory cards.
3.3 VDC 1 Amp supply
Used by all accessory cards.
