ETRX357 Development Kit
©2016 Silicon Labs
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ETRX357DVK Product Manual (Rev 1.12)
7
Setting up the Hardware
In the development kits are all four versions of the module. They can be powered from either a USB
hub, the mains (via a suitable power supply) or batteries.
Figure 3. ETRX357-LR Module on Carrierboard plugged on to Devboard
8
ETRX357 pinout
The functions of each of the ETRX357 pins depend on the firmware. When using the Telegesis AT
command-based firmware the S-register settings control the configuration of the I/Os. Some of them
have a main function and an alternate function, as determined by the value of register S15. Holding
pad PA5 low when powering up or resetting the module will cause it to enter the bootloader mode;
this operation lies outside the normal firmware so it is independent of the value of S15. As the
functions are firmware-dependent and may change between versions, Table 3 should be read in
conjunction with the latest R3xx AT Command Manual.
Notes on Table 3 headings
Name
is the designation of both the ETRX357 pad and the EM357 chip pin.
Index
can be used to reference the individual pin in various S-registers (see the R3xx AT Command
Manual)
Pad
is the module’s pad numbering
Default direction
indicates whether the pad is normally an input or output
Main function
and
Alternate function
indicate the purpose and connection of the pad
Default alt fn setting
indicates whether the default firmware setting chooses the main or alternate
function
