User's Manual

ETRX358x-LRS and ETRX358x-LRS
©2014 Telegesis (UK) Ltd - 14 - ETRX358x-LRS Product Manual
4 Hardware Description
24MHz
EM358x
I/O
UART
I / O
programming
5 JTAG
V
cc
V
reg
RESET
RESET
Match
integrated
antenna
U.FL socket
rf
terminal
selection,
filtering and
matching
circuitry
LDO
1V8
1,8Vdc
A/D
LDO
1V25
Match
FEM
USB*
*not available on all Types
Figure 2. Hardware Diagram
The ETRX358x-LRS and ETRX358x-LRS are based on the Silicon Labs EM358x family of ZigBee
SoCs in addition to a frontend module containing a PA, LNA and RF switch in addition to the RF-
frontend circuitry. The EM358x family of ZigBee SoCs are fully integrated 2.4GHz ZigBee
transceivers with a 32-bit ARM
®
Cortex M3
TM
microprocessor, flash and RAM memory, and
peripherals.
The industry standard serial wire and JTAG programming and debugging interfaces together with
the standard ARM system debug components help to streamline any custom software
development.
In addition to this a number of MAC functions are also implemented in hardware to help maintain
the strict timing requirements imposed by the ZigBee and IEEE802.15.4 standards.
The new advanced power management features allow faster wakeup from sleep and new power-
down modes allow this 3
rd
generation module to offer a longer battery life than any 2
nd
generation
modules on the market.
The EM358x has fully integrated voltage regulators for both required 1.8V and 1.25V supply
voltages. The voltages are monitored (brown-out detection) and the built in power-on-reset circuit
eliminates the need for any external monitoring circuitry. A 32.768kHz watch crystal can be
connected externally to pads 3 and 4 in case more accurate timing is required.
4.1 Hardware Interface
All GPIO pins of the EM358x chips are accessible on the module’s pads. Whether signals are
used as general purpose I/Os, or assigned to a peripheral function like ADC is set by the firmware.
When using the Telegesis AT Commandset please refer to the AT Commandset manual and the
development kit manual for this information and when developing custom firmware please refer to
the EM358x datasheet [2].