EM3585 datasheet(13/41 Pages) SILABS

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ETRX3585-LRS and ETRX3585HR-LRS

- 13 -

ETRX3585-LRS Product Manual

4 Hardware Description

24MHz

EM358x

I/O

UART

I / O

programming

5 JTAG

Vcc

Vreg

RESET

Match

integrated

antenna

U.FL socket

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 ETRX3585-LRS and ETRX3585-LRS are based on the Silicon Labs EM3585 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 EM3585 family of ZigBee SoCs are fully integrated 2.4GHz ZigBee

transceivers with a 32-bit ARM® Cortex M3TM 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 3rd generation module to offer a longer battery life than any 2nd generation

modules on the market.

The EM3585 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 EM3585 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 developing custom firmware please refer to the EM3585 datasheet [2].

EM3585 Datasheet(PDF) 13 Page - Silicon Laboratories

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