2.1.1 Standard Interfaces
The standard interfaces on the Apalis module family guarantees electrical and functional
compatibility between the module family members. The table below shows an overview of the
standard interfaces that are provided by an Apalis module. The “GPIO Capable” column indicates
whether the assigned pins can be used as GPIOs. “Yes” and “No” are self-Explanatory. “Optional”
indicates that it may be possible for some modules, but not all.
The “Standard” column indicates the number of interfaces that the specification allows for in the
standard pin-out. Customers should consult the datasheet for specific Apalis module variants to
check which interfaces are available for that module. If a module does not feature the complete
number of interfaces that is specified by the Apalis standard, the provided interfaces are tried to be
filled in the ascending order from low to high. For example, the Apalis standard features 4 UART
ports (port 1 to port 4). If a module only provides 3 UART interfaces, they are provided at port 1, 2
and 3 of the module edge connector. Port 4 will be left unconnected in this case. If a custom
carrier board only uses 2 UART interfaces, port 1 and 2 should be used. This guarantees better
compatibility with Apalis modules that do not feature all UART ports.
Special attention should be taken to the USB ports. Since only USBO1 and USBH4 are SuperSpeed
capable, The Apalis TK1 provides USBO1, USBH2, and USBH4 while USBH3 is left unconnected.
On the other hand, Apalis T30 provides USBO1, USBH2, and USBH3 while USBH4 is unconnected.
Carrier board designs which require 3 USB interfaces may need assembly option for using USBH4
instead of USBH3.
The Apalis standard features two SD/MMC interfaces. Due to the different maximum available bit
width, the interfaces are called MMC1 (up to 8-bit) and SD1 (up to 4-bit). The MMC1 interface is
the preferred one if only one SD/MMC interface is required on a carrier board. A module that
features only one SD/MMC interface will first implement the MMC1.
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